从相机捕获图像并在活动中显示


278

我想编写一个模块,单击一个按钮即可打开相机,然后单击并捕获图像。如果我不喜欢该图像,则可以将其删除,然后再单击一个图像,然后选择该图像,它应返回并在活动中显示该图像。


3
您应该打开相机意图,捕获图像,如果需要,将其保存在SD卡上,通过内容提供程序获取ID,并在带有“确定/取消”按钮的对话框中显示它。
Zoombie 2011年

1
@jengelsma我在使用相机时遇到一个问题,我以人像模式捕获图像并在imageview中显示,然后始终以风景模式显示。
Zala Janaksinh

@Harsha MV如果您得到了答案,请回复我。
Zala Janaksinh

该博客可以为您提供帮助。 startandroiddevelopment.blogspot.in/2013/10/...

Answers:


473

这是一个示例活动,它将启动相机应用程序,然后检索图像并显示它。

package edu.gvsu.cis.masl.camerademo;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MyCameraActivity extends Activity
{
    private static final int CAMERA_REQUEST = 1888; 
    private ImageView imageView;
    private static final int MY_CAMERA_PERMISSION_CODE = 100;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        this.imageView = (ImageView)this.findViewById(R.id.imageView1);
        Button photoButton = (Button) this.findViewById(R.id.button1);
        photoButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
                {
                    requestPermissions(new String[]{Manifest.permission.CAMERA}, MY_CAMERA_PERMISSION_CODE);
                }
                else
                {
                    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                    startActivityForResult(cameraIntent, CAMERA_REQUEST);
                } 
            }
        });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
    {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == MY_CAMERA_PERMISSION_CODE)
        {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED)
            {
                Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
                Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                startActivityForResult(cameraIntent, CAMERA_REQUEST);
            }
            else
            {
                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
            }
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {  
        if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK)
        {  
            Bitmap photo = (Bitmap) data.getExtras().get("data"); 
            imageView.setImageBitmap(photo);
        }  
    } 
}

请注意,相机应用程序本身使您能够查看/重新拍摄图像,一旦图像被接受,活动就会显示它。

这是上述活动使用的布局。它只是一个LinearLayout,其中包含ID为button1的Button和ID为imageview1的ImageView:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/photo"></Button>
    <ImageView android:id="@+id/imageView1" android:layout_height="wrap_content" android:src="@drawable/icon" android:layout_width="wrap_content"></ImageView>

</LinearLayout>

最后一个细节,请务必添加:

<uses-feature android:name="android.hardware.camera"></uses-feature> 

以及相机是否对您的应用功能是可选的。确保在权限中将require设置为false。像这样

<uses-feature android:name="android.hardware.camera" android:required="false"></uses-feature>

到您的manifest.xml。


18
位图照片=(位图)data.getExtras()。get(“ data”); 它给出了Null指针的期望。当我打开应用程序并单击Capture ..时,它进入了相机应用程序,并在2-4秒后崩溃了。
Harsha MV,

6
为了安全起见,我们应该检查onActivityResult()方法中的resultCode == Activity.RESULT_OK。至于为什么相机崩溃,我们必须查看堆栈跟踪。
jengelsma

6
@Harsha MV这是三星Galaxy上的已知错误。请看到这个答案stackoverflow.com/questions/7031374/...
哦,丹尼男孩

7
@WillKru如果该功能是不是强制性的,你应该添加<uses-feature/>android:required="false"属性:<uses-feature android:name="android.hardware.camera" android:required="false"></uses-feature>
whlk

122
另请注意,Bitmap photo = (Bitmap) data.getExtras().get("data"); 它不会捕获所拍摄的图像。它获取所拍摄图像的缩略图。
比利·库弗

44

更新(2020)

Google添加了一个新的ActivityResultRegistryAPI,“可以让您处理startActivityForResult()+ onActivityResult()以及requestPermissions()+ onRequestPermissionsResult()流,而不必在Activity或Fragment中覆盖方法,通过带来更高的类型安全性ActivityResultContract,并提供用于测试这些流的钩子” -

该API已在androidx.activity 1.2.0-alpha02androidx.fragment 1.3.0-alpha02中添加

因此,您现在可以执行以下操作:

val takePicture = registerForActivityResult(ActivityResultContracts.TakePicture()) { success: Boolean ->
    if (success) {
        // The image was saved into the given Uri -> do something with it
    }
}

val imageUri: Uri = ...
button.setOnClickListener {
    takePicture.launch(imageUri)
}

查看文档以了解如何使用新的Activity结果API:https//developer.android.com/training/basics/intents/result#kotlin

有许多内置的ActivityResultContracts,可让您执行不同的操作,例如选择联系人,请求权限,拍照或拍摄视频。您可能对ActivityResultContracts.TakePicture感兴趣上面显示。

请注意,androidx.fragment 1.3.0-alpha04弃用了Fragment上的startActivityForResult()+ onActivityResult()requestPermissions()+ onRequestPermissionsResult()API。因此,ActivityResultContracts从现在开始,这似乎是一种新的处理方式。


原始答案(2015年)

我花了几个小时才能完成这项工作。它的代码几乎是来自developer.android.com的复制粘贴,只有很小的区别。

在以下位置请求此权限AndroidManifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

在您的Activity,首先定义以下内容:

static final int REQUEST_IMAGE_CAPTURE = 1;
private Bitmap mImageBitmap;
private String mCurrentPhotoPath;
private ImageView mImageView;

然后,这火IntentonClick

Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (cameraIntent.resolveActivity(getPackageManager()) != null) {
    // Create the File where the photo should go
    File photoFile = null;
    try {
        photoFile = createImageFile();
    } catch (IOException ex) {
        // Error occurred while creating the File
        Log.i(TAG, "IOException");
    }
    // Continue only if the File was successfully created
    if (photoFile != null) {
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
        startActivityForResult(cameraIntent, REQUEST_IMAGE_CAPTURE);
    }
}

添加以下支持方法:

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  // prefix
            ".jpg",         // suffix
            storageDir      // directory
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;
}

然后接收结果:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        try {
            mImageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(mCurrentPhotoPath));
            mImageView.setImageBitmap(mImageBitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使它起作用的是与MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(mCurrentPhotoPath)),它与developer.android.com中的代码不同。原始代码给了我一个FileNotFoundException


因为MediaStore.EXTRA_OUTPUT导致空意图结果,所以“ Uri.parse(mCurrentPhotoPath))”是解决方案。
阿米尔·法兹万

1
默认情况下,我的图片以横向模式拍摄,我有什么遗漏吗?
阿米特·加格

1
该代码对我不起作用。我收到了android.os.FileUriExposedException: file:///storage/emulated/0/Pictures/JPEG_20180823_102340_722874009725833047.jpg exposed beyond app through ClipData.Item.getUri()。关于如何解决这个问题的任何想法?@AlbertVilaCalvo

1
@AlbertVilaCalvo我不知道。那么,您对如何解决此问题有任何想法吗?我不知道我能改变什么。希望您能帮助我,谢谢。

1
我不得不用storageDir = Context.getFilesDir();File代替storageDir = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES);。否则,我会收到权限被拒绝的错误。
探索

19

拍摄照片+从图库中选择:

        a = (ImageButton)findViewById(R.id.imageButton1);

        a.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                selectImage();

            }

        });
    }
    private File savebitmap(Bitmap bmp) {
      String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
      OutputStream outStream = null;
     // String temp = null;
        File file = new File(extStorageDirectory, "temp.png");
      if (file.exists()) {
       file.delete();
       file = new File(extStorageDirectory, "temp.png");

      }

      try {
       outStream = new FileOutputStream(file);
       bmp.compress(Bitmap.CompressFormat.PNG, 100, outStream);
       outStream.flush();
       outStream.close();

      } catch (Exception e) {
       e.printStackTrace();
       return null;
      }
      return file;
     }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
     private void selectImage() {



            final CharSequence[] options = { "Take Photo", "Choose from Gallery","Cancel" };



            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

            builder.setTitle("Add Photo!");

            builder.setItems(options, new DialogInterface.OnClickListener() {

                @Override

                public void onClick(DialogInterface dialog, int item) {

                    if (options[item].equals("Take Photo"))

                    {

                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                        File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");

                        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
                        //pic = f;

                        startActivityForResult(intent, 1);


                    }

                    else if (options[item].equals("Choose from Gallery"))

                    {

                        Intent intent = new   Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                        startActivityForResult(intent, 2);



                    }

                    else if (options[item].equals("Cancel")) {

                        dialog.dismiss();

                    }

                }

            });

            builder.show();

        }



        @Override

        protected void onActivityResult(int requestCode, int resultCode, Intent data) {

            super.onActivityResult(requestCode, resultCode, data);

            if (resultCode == RESULT_OK) {

                if (requestCode == 1) {
                    //h=0;
                    File f = new File(Environment.getExternalStorageDirectory().toString());

                    for (File temp : f.listFiles()) {

                        if (temp.getName().equals("temp.jpg")) {

                            f = temp;
                            File photo = new File(Environment.getExternalStorageDirectory(), "temp.jpg");
                           //pic = photo;
                            break;

                        }

                    }

                    try {

                        Bitmap bitmap;

                        BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();



                        bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),

                                bitmapOptions); 



                        a.setImageBitmap(bitmap);




                        String path = android.os.Environment

                                .getExternalStorageDirectory()

                                + File.separator

                                + "Phoenix" + File.separator + "default";
                        //p = path;

                        f.delete();

                        OutputStream outFile = null;

                        File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");

                        try {

                            outFile = new FileOutputStream(file);

                            bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
    //pic=file;
                            outFile.flush();

                            outFile.close();


                        } catch (FileNotFoundException e) {

                            e.printStackTrace();

                        } catch (IOException e) {

                            e.printStackTrace();

                        } catch (Exception e) {

                            e.printStackTrace();

                        }

                    } catch (Exception e) {

                        e.printStackTrace();

                    }

                } else if (requestCode == 2) {



                    Uri selectedImage = data.getData();
                   // h=1;
    //imgui = selectedImage;
                    String[] filePath = { MediaStore.Images.Media.DATA };

                    Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);

                    c.moveToFirst();

                    int columnIndex = c.getColumnIndex(filePath[0]);

                    String picturePath = c.getString(columnIndex);

                    c.close();

                    Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));


                    Log.w("path of image from gallery......******************.........", picturePath+"");


                    a.setImageBitmap(thumbnail);

                }

            }

ResultCode == 1在里面ResultCode == RESULT_OK
Srujan Barai

requestCode==1,可帮助您确定是谁发起了请求。
Irshu

18

我知道这是一个很老的线程,但是所有这些解决方案都还没有完成,并且当用户旋转相机时,由于onActivityResult中的数据为空,因此这些解决方案在某些设备上不起作用。所以这是我已经在很多设备上测试过的解决方案,到目前为止还没有遇到任何问题。

首先在您的活动中声明您的Uri变量:

private Uri uriFilePath;

然后创建用于存储捕获的图像的临时文件夹,并打算通过相机捕获图像:

PackageManager packageManager = getActivity().getPackageManager();
if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
    File mainDirectory = new File(Environment.getExternalStorageDirectory(), "MyFolder/tmp");
         if (!mainDirectory.exists())
             mainDirectory.mkdirs();

          Calendar calendar = Calendar.getInstance();

          uriFilePath = Uri.fromFile(new File(mainDirectory, "IMG_" + calendar.getTimeInMillis()));
          intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          intent.putExtra(MediaStore.EXTRA_OUTPUT, uriFilePath);
          startActivityForResult(intent, 1);
}

现在这是最重要的事情之一,您必须将uriFilePath保存在onSaveInstanceState中,因为如果不这样做,并且用户在使用相机时旋转了设备,则uri将为null。

@Override
protected void onSaveInstanceState(Bundle outState) {
     if (uriFilePath != null)
         outState.putString("uri_file_path", uriFilePath.toString());
     super.onSaveInstanceState(outState);
}

之后,您应该始终在onCreate方法中恢复您的uri:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (savedInstanceState != null) {
         if (uriFilePath == null && savedInstanceState.getString("uri_file_path") != null) {
             uriFilePath = Uri.parse(savedInstanceState.getString("uri_file_path"));
         }
    } 
}

这是最后一部分,可以让您的Uri进入onActivityResult:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {    
    if (resultCode == RESULT_OK) {
         if (requestCode == 1) {
            String filePath = uriFilePath.getPath(); // Here is path of your captured image, so you can create bitmap from it, etc.
         }
    }
 }

PS不要忘记为Camera和Ext添加权限。存储写入清单。


我正在使用FragmentDialog。我声明了Uri,然后在方法“ storeCapturedImage”中声明了-我放入PackageManager代码,然后添加onSaveInstanceState()-所有这些均在onCreate之前。然后在onCreateDialog中,放置了“ recover your uri”代码,然后将onActivityResult放置在onCreate方法的上方...有关在“ recover your uri”代码之后的内容,请参阅下一篇评论
LizG

AlertDialog.Builder builder =新的AlertDialog.Builder(getActivity()); LayoutInflater inflater = getActivity()。getLayoutInflater(); View dialogView = inflater.inflate(R.layout.username_dialog,null); ImageView profilePic = dialogView.findViewById(R.id.profile_pic); profilePic.setImageResource(R.drawable.user_placeholder); profilePic.setOnClickListener(new View.OnClickListener(){@Override public void onClick(View view){storeCapturedImage();}}); builder.setView(dialogView);
LizG

1
我真的很奇怪,为什么OS不会按照OnActivityResult的意图向您发送uri。我希望这是有充分理由的,因为开展国际海事组织始终不是一件好事。
韦恩·浦田

那么onActivityResult回调中的数据有什么用?
Ewoks

10

在这里您可以打开相机或图库并将所选图像设置为imageview

private static final String IMAGE_DIRECTORY = "/YourDirectName";
private Context mContext;
private CircleImageView circleImageView;  // imageview
private int GALLERY = 1, CAMERA = 2;

在清单中添加权限

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="ANDROID.PERMISSION.READ_EXTERNAL_STORAGE" />

在onCreate()中

    requestMultiplePermissions(); // check permission 

    circleImageView = findViewById(R.id.profile_image);
    circleImageView.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            showPictureDialog();
        }
    });

显示选项对话框(从相机或图库中选择图像)

private void showPictureDialog() {
    AlertDialog.Builder pictureDialog = new AlertDialog.Builder(this);
    pictureDialog.setTitle("Select Action");
    String[] pictureDialogItems = {"Select photo from gallery", "Capture photo from camera"};
    pictureDialog.setItems(pictureDialogItems,
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    switch (which) {
                        case 0:
                            choosePhotoFromGallary();
                            break;
                        case 1:
                            takePhotoFromCamera();
                            break;
                    }
                }
            });
    pictureDialog.show();
}

从图库获取照片

public void choosePhotoFromGallary() {
    Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(galleryIntent, GALLERY);
}

从相机获取照片

private void takePhotoFromCamera() {
    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent, CAMERA);
}

选择或捕获图像后,

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == this.RESULT_CANCELED) {
        return;
    }
    if (requestCode == GALLERY) {
        if (data != null) {
            Uri contentURI = data.getData();
            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), contentURI);
                String path = saveImage(bitmap);
                Toast.makeText(getApplicationContext(), "Image Saved!", Toast.LENGTH_SHORT).show();
                circleImageView.setImageBitmap(bitmap);

            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Failed!", Toast.LENGTH_SHORT).show();
            }
        }

    } else if (requestCode == CAMERA) {
        Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
        circleImageView.setImageBitmap(thumbnail);
        saveImage(thumbnail);
        Toast.makeText(getApplicationContext(), "Image Saved!", Toast.LENGTH_SHORT).show();
    }
}

现在是时候存储图片了

public String saveImage(Bitmap myBitmap) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
    File wallpaperDirectory = new File(Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
    if (!wallpaperDirectory.exists()) {  // have the object build the directory structure, if needed.
        wallpaperDirectory.mkdirs();
    }

    try {
        File f = new File(wallpaperDirectory, Calendar.getInstance().getTimeInMillis() + ".jpg");
        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
        MediaScannerConnection.scanFile(this,
                new String[]{f.getPath()},
                new String[]{"image/jpeg"}, null);
        fo.close();
        Log.d("TAG", "File Saved::---&gt;" + f.getAbsolutePath());

        return f.getAbsolutePath();
    } catch (IOException e1) {
        e1.printStackTrace();
    }
    return "";
}

请求权限

    private void requestMultiplePermissions() {
    Dexter.withActivity(this)
            .withPermissions(
                    Manifest.permission.CAMERA,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.READ_EXTERNAL_STORAGE)
            .withListener(new MultiplePermissionsListener() {
                @Override
                public void onPermissionsChecked(MultiplePermissionsReport report) {
                    if (report.areAllPermissionsGranted()) {  // check if all permissions are granted
                        Toast.makeText(getApplicationContext(), "All permissions are granted by user!", Toast.LENGTH_SHORT).show();
                    }

                    if (report.isAnyPermissionPermanentlyDenied()) { // check for permanent denial of any permission
                        // show alert dialog navigating to Settings
                        //openSettingsDialog();
                    }
                }

                @Override
                public void onPermissionRationaleShouldBeShown(List<PermissionRequest> permissions, PermissionToken token) {
                    token.continuePermissionRequest();
                }
            }).
            withErrorListener(new PermissionRequestErrorListener() {
                @Override
                public void onError(DexterError error) {
                    Toast.makeText(getApplicationContext(), "Some Error! ", Toast.LENGTH_SHORT).show();
                }
            })
            .onSameThread()
            .check();
}

9

您需要阅读有关相机的信息。(我想做您想做的事,您必须将当前图像保存到您的应用程序中,在其中进行选择/删除,然后重新调用相机以重试,而不是直接在相机内部进行重试。)


8

这是我用于捕获和保存摄像机图像,然后将其显示到imageview的代码。您可以根据需要使用。

您必须将摄像机图像保存到特定位置,然后从该位置获取然后将其转换为字节数组。

这是用于打开捕获摄像机图像活动的方法。

private static final int CAMERA_PHOTO = 111;
private Uri imageToUploadUri;

private void captureCameraImage() {
        Intent chooserIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        File f = new File(Environment.getExternalStorageDirectory(), "POST_IMAGE.jpg");
        chooserIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
        imageToUploadUri = Uri.fromFile(f);
        startActivityForResult(chooserIntent, CAMERA_PHOTO);
    }

那么您的onActivityResult()方法应该像这样。

@Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);

            if (requestCode == CAMERA_PHOTO && resultCode == Activity.RESULT_OK) {
                if(imageToUploadUri != null){
                    Uri selectedImage = imageToUploadUri;
                    getContentResolver().notifyChange(selectedImage, null);
                    Bitmap reducedSizeBitmap = getBitmap(imageToUploadUri.getPath());
                    if(reducedSizeBitmap != null){
                        ImgPhoto.setImageBitmap(reducedSizeBitmap);
                        Button uploadImageButton = (Button) findViewById(R.id.uploadUserImageButton);
                          uploadImageButton.setVisibility(View.VISIBLE);                
                    }else{
                        Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
                    }
                }else{
                    Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
                }
            } 
        }

这是onActivityResult()中使用的getBitmap()方法。我已经完成了所有性能改进,而这些改进可以在获取相机捕获图像位图的同时实现。

private Bitmap getBitmap(String path) {

        Uri uri = Uri.fromFile(new File(path));
        InputStream in = null;
        try {
            final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
            in = getContentResolver().openInputStream(uri);

            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(in, null, o);
            in.close();


            int scale = 1;
            while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
                    IMAGE_MAX_SIZE) {
                scale++;
            }
            Log.d("", "scale = " + scale + ", orig-width: " + o.outWidth + ", orig-height: " + o.outHeight);

            Bitmap b = null;
            in = getContentResolver().openInputStream(uri);
            if (scale > 1) {
                scale--;
                // scale to max possible inSampleSize that still yields an image
                // larger than target
                o = new BitmapFactory.Options();
                o.inSampleSize = scale;
                b = BitmapFactory.decodeStream(in, null, o);

                // resize to desired dimensions
                int height = b.getHeight();
                int width = b.getWidth();
                Log.d("", "1th scale operation dimenions - width: " + width + ", height: " + height);

                double y = Math.sqrt(IMAGE_MAX_SIZE
                        / (((double) width) / height));
                double x = (y / height) * width;

                Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
                        (int) y, true);
                b.recycle();
                b = scaledBitmap;

                System.gc();
            } else {
                b = BitmapFactory.decodeStream(in);
            }
            in.close();

            Log.d("", "bitmap size - width: " + b.getWidth() + ", height: " +
                    b.getHeight());
            return b;
        } catch (IOException e) {
            Log.e("", e.getMessage(), e);
            return null;
        }
    }

希望能帮助到你!


我尝试了此操作,然后从onClickListener将captureImage()放在onClick中,但无法正常工作。我正在使用FragmentDialog ...有什么想法吗?
LizG '17

6

从相机捕获照片+从图库中选择图像,并将其设置为布局或imageview的背景。这是示例代码。

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;

    import android.provider.MediaStore;
    import android.util.Log;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.GridView;
    import android.widget.ImageView;
    import android.widget.LinearLayout;

    public class Post_activity extends Activity
    {
        final int TAKE_PICTURE = 1;
        final int ACTIVITY_SELECT_IMAGE = 2;

        ImageView openCameraOrGalleryBtn,cancelBtn;
        LinearLayout backGroundImageLinearLayout;

        public void onCreate(Bundle savedBundleInstance) {
            super.onCreate(savedBundleInstance);
            overridePendingTransition(R.anim.slide_up,0);
            setContentView(R.layout.post_activity);

            backGroundImageLinearLayout=(LinearLayout)findViewById(R.id.background_image_linear_layout);
            cancelBtn=(ImageView)findViewById(R.id.cancel_icon);

            openCameraOrGalleryBtn=(ImageView)findViewById(R.id.camera_icon);



            openCameraOrGalleryBtn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub

                    selectImage();
                }
            });
            cancelBtn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                overridePendingTransition(R.anim.slide_down,0);
                finish();
                }
            });

        }

    public void selectImage()
        {
             final CharSequence[] options = { "Take Photo", "Choose from Gallery","Cancel" };
             AlertDialog.Builder builder = new AlertDialog.Builder(Post_activity.this);
                builder.setTitle("Add Photo!");
                builder.setItems(options,new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        if(options[which].equals("Take Photo"))
                        {
                            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                            startActivityForResult(cameraIntent, TAKE_PICTURE);
                        }
                        else if(options[which].equals("Choose from Gallery"))
                        {
                            Intent intent=new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                            startActivityForResult(intent, ACTIVITY_SELECT_IMAGE);
                        }
                        else if(options[which].equals("Cancel"))
                        {
                            dialog.dismiss();
                        }

                    }
                });
                builder.show();
        }
        public void onActivityResult(int requestcode,int resultcode,Intent intent)
        {
            super.onActivityResult(requestcode, resultcode, intent);
            if(resultcode==RESULT_OK)
            {
                if(requestcode==TAKE_PICTURE)
                {
                    Bitmap photo = (Bitmap)intent.getExtras().get("data"); 
                    Drawable drawable=new BitmapDrawable(photo);
                    backGroundImageLinearLayout.setBackgroundDrawable(drawable);

                }
                else if(requestcode==ACTIVITY_SELECT_IMAGE)
                {
                    Uri selectedImage = intent.getData();
                    String[] filePath = { MediaStore.Images.Media.DATA };
                    Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);
                    c.moveToFirst();
                    int columnIndex = c.getColumnIndex(filePath[0]);
                    String picturePath = c.getString(columnIndex);
                    c.close();
                    Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
                    Drawable drawable=new BitmapDrawable(thumbnail);
                    backGroundImageLinearLayout.setBackgroundDrawable(drawable);


                }
            }
        }

        public void onBackPressed() {
            super.onBackPressed();
            //overridePendingTransition(R.anim.slide_down,0);
        }
    }

Add these permission in Androidmenifest.xml file

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.CAMERA"/>

这已经很老了,但我喜欢您的操作方式。当我从图库中选择时,图像却无法显示。有什么想法吗?
rafvasq '16

4

活动中:

@Override
    protected void onCreate(Bundle savedInstanceState) {
                 image = (ImageView) findViewById(R.id.imageButton);
        image.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                try {
                SimpleDateFormat sdfPic = new SimpleDateFormat(DATE_FORMAT);
                currentDateandTime = sdfPic.format(new Date()).replace(" ", "");
                File imagesFolder = new File(IMAGE_PATH, currentDateandTime);
                imagesFolder.mkdirs();
                Random generator = new Random();
                int n = 10000;
                n = generator.nextInt(n);
                String fname = IMAGE_NAME + n + IMAGE_FORMAT;
                File file = new File(imagesFolder, fname);
                outputFileUri = Uri.fromFile(file);
                cameraIntent= new Intent(
                        android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                                startActivityForResult(cameraIntent, CAMERA_DATA);
                }catch(Exception e) {
                    e.printStackTrace();
                }

            }
        });
           @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode) {
        case CAMERA_DATA :
                final int IMAGE_MAX_SIZE = 300;
                try {
                    // Bitmap bitmap;
                    File file = null;
                    FileInputStream fis;
                    BitmapFactory.Options opts;
                    int resizeScale;
                    Bitmap bmp;
                    file = new File(outputFileUri.getPath());
                    // This bit determines only the width/height of the
                    // bitmap
                    // without loading the contents
                    opts = new BitmapFactory.Options();
                    opts.inJustDecodeBounds = true;
                    fis = new FileInputStream(file);
                    BitmapFactory.decodeStream(fis, null, opts);
                    fis.close();

                    // Find the correct scale value. It should be a power of
                    // 2
                    resizeScale = 1;

                    if (opts.outHeight > IMAGE_MAX_SIZE
                            || opts.outWidth > IMAGE_MAX_SIZE) {
                        resizeScale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE/ (double) Math.max(opts.outHeight, opts.outWidth)) / Math.log(0.5)));
                    }

                    // Load pre-scaled bitmap
                    opts = new BitmapFactory.Options();
                    opts.inSampleSize = resizeScale;
                    fis = new FileInputStream(file);
                    bmp = BitmapFactory.decodeStream(fis, null, opts);
                    Bitmap getBitmapSize = BitmapFactory.decodeResource(
                            getResources(), R.drawable.male);
                    image.setLayoutParams(new RelativeLayout.LayoutParams(
                            200,200));//(width,height);
                    image.setImageBitmap(bmp);
                    image.setRotation(90);
                    fis.close();

                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    bmp.compress(Bitmap.CompressFormat.JPEG, 70, baos);
                    imageByte = baos.toByteArray();
                    break;
                } catch (FileNotFoundException e) {

                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

在layout.xml中:

enter code here
<RelativeLayout
        android:id="@+id/relativeLayout2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">


        <ImageView
            android:id="@+id/imageButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

                            android:src="@drawable/XXXXXXX"
            android:textAppearance="?android:attr/textAppearanceSmall" />

在manifest.xml中:

    <uses-permission android:name="android.permission.CAMERA" />   <uses-feature android:name="android.hardware.camera" />


3

您可以将自定义相机与缩略图一起使用。你可以看一下我的项目


3

我创建了一个对话框,可以选择从图库或照相机中选择图像。与作为回调

  • 乌里(如果图片来自画廊)
  • 如果从相机捕获图像,则将字符串作为文件路径。
  • 图像作为文件从摄像机选择的图像需要作为多部分文件数据上传到互联网

首先,我们需要在AndroidManifest中定义权限,因为我们需要在创建文件并从图库中读取图像时编写外部存储

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

在app / src / main / res / xml / file_paths.xml中创建一个file_paths xml

带路径

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

然后,我们需要定义文件提供者以生成Content uri来访问存储在外部存储中的文件

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

Dailog布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.50" />

    <ImageView
        android:id="@+id/gallery"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="32dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline2"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_menu_gallery" />

    <ImageView
        android:id="@+id/camera"
        android:layout_width="48dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="32dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline2"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_menu_camera" />
</androidx.constraintlayout.widget.ConstraintLayout>

ImagePicker Dailog

public class ImagePicker extends BottomSheetDialogFragment {
ImagePicker.GetImage getImage;
publ` enter code here` ic ImagePicker(ImagePicker.GetImage getImage, boolean allowMultiple) {
    this.getImage = getImage;
}
File cameraImage;@
Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.bottom_sheet_imagepicker, container, false);
    view.findViewById(R.id.camera).setOnClickListener(new View.OnClickListener() {@
        Override
        public void onClick(View view) {
            if(ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[] {
                    Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE
                }, 2000);
            } else {
                captureFromCamera();
            }
        }
    });
    view.findViewById(R.id.gallery).setOnClickListener(new View.OnClickListener() {@
        Override
        public void onClick(View view) {
            if(ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[] {
                    Manifest.permission.READ_EXTERNAL_STORAGE
                }, 2000);
            } else {
                startGallery();
            }
        }
    });
    return view;
}
public interface GetImage {
    void setGalleryImage(Uri imageUri);
    void setCameraImage(String filePath);
    void setImageFile(File file);
}@
Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == Activity.RESULT_OK) {
        if(requestCode == 1000) {
            Uri returnUri = data.getData();
            getImage.setGalleryImage(returnUri);
            Bitmap bitmapImage = null;
        }
        if(requestCode == 1002) {
            if(cameraImage != null) {
                getImage.setImageFile(cameraImage);
            }
            getImage.setCameraImage(cameraFilePath);
        }
    }
}
private void startGallery() {
    Intent cameraIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    cameraIntent.setType("image/*");
    if(cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) {
        startActivityForResult(cameraIntent, 1000);
    }
}
private String cameraFilePath;
private File createImageFile() throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "Camera");
    File image = File.createTempFile(imageFileName, /* prefix */ ".jpg", /* suffix */ storageDir /* directory */ );
    cameraFilePath = "file://" + image.getAbsolutePath();
    cameraImage = image;
    return image;
}
private void captureFromCamera() {
    try {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getContext(), BuildConfig.APPLICATION_ID + ".provider", createImageFile()));
        startActivityForResult(intent, 1002);
    } catch(IOException ex) {
        ex.printStackTrace();
    }
}

}

调用Activity或这样的片段在Fragment / Activity中定义ImagePicker

ImagePicker imagePicker;

然后点击按钮调用dailog

      imagePicker = new ImagePicker(new ImagePicker.GetImage() {
            @Override
            public void setGalleryImage(Uri imageUri) {

                Log.i("ImageURI", imageUri + "");

                String[] filePathColumn = {MediaStore.Images.Media.DATA};

                Cursor cursor = getContext().getContentResolver().query(imageUri, filePathColumn, null, null, null);
                assert cursor != null;
                cursor.moveToFirst();

                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                mediaPath = cursor.getString(columnIndex);
                // Set the Image in ImageView for Previewing the Media
                imagePreview.setImageBitmap(BitmapFactory.decodeFile(mediaPath));
                cursor.close();

            }

            @Override
            public void setCameraImage(String filePath) {

                mediaPath =filePath;
                Glide.with(getContext()).load(filePath).into(imagePreview);

            }

            @Override
            public void setImageFile(File file) {

                cameraImage = file;

            }
        }, true);
        imagePicker.show(getActivity().getSupportFragmentManager(), imagePicker.getTag());

2

这是完整的代码:

package com.example.cameraa;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {




        Button btnTackPic;
        Uri photoPath;
        ImageView ivThumbnailPhoto;

        static int TAKE_PICTURE = 1;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // Get reference to views

            btnTackPic = (Button) findViewById(R.id.bt1);
            ivThumbnailPhoto = (ImageView) findViewById(R.id.imageView1);




     btnTackPic.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


                Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                startActivityForResult(cameraIntent, TAKE_PICTURE); 
            }




    });

        } 

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent intent) {


                if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {  
                    Bitmap photo = (Bitmap)intent.getExtras().get("data"); 
                   ivThumbnailPhoto.setImageBitmap(photo);
                ivThumbnailPhoto.setVisibility(View.VISIBLE);



            }
        }
}

记住也要添加摄像机的权限。


2

您可以使用此代码来onClick侦听器(可以使用ImageView或button)

image.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                startActivityForResult(takePictureIntent, 1);
            }
        }
    });

在您的imageView中显示

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        bitmap = (Bitmap) extras.get("data");
        image.setImageBitmap(bitmap);

    }
}

注意:将其插入清单

<uses-feature android:name="android.hardware.camera" android:required="true" />

1

使用以下代码使用您的移动相机捕获图片。如果您使用的Android版本高于Lolipop,则还应添加权限请求。

private void cameraIntent()
    {
          Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          startActivityForResult(intent, REQUEST_CAMERA);
    }

@override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
     if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {  
            Bitmap photo = (Bitmap) data.getExtras().get("data"); 
            imageView.setImageBitmap(photo);
     }  
} 


1

请通过使用Kotlin和Andoirdx支持,将此示例与该实现一起进行:

button1.setOnClickListener{
        file = getPhotoFile()
        val uri: Uri = FileProvider.getUriForFile(applicationContext, "com.example.foto_2.filrprovider", file!!)
        captureImage.putExtra(MediaStore.EXTRA_OUTPUT, uri)

        val camaraActivities: List<ResolveInfo> = applicationContext.getPackageManager().queryIntentActivities(captureImage, PackageManager.MATCH_DEFAULT_ONLY)

        for (activity in camaraActivities) {
            applicationContext.grantUriPermission(activity.activityInfo.packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
        }

        startActivityForResult(captureImage, REQUEST_PHOTO)
    }

活动结果:

if (requestCode == REQUEST_PHOTO) {
        val uri = FileProvider.getUriForFile(applicationContext, "com.example.foto_2.filrprovider", file!!)
        applicationContext.revokeUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
        imageView1.viewTreeObserver.addOnGlobalLayoutListener {
            width = imageView1.width
            height = imageView1.height
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , width , height))
        }
        if(width!=0&&height!=0){
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , width , height))
        }else{
            val size = Point()
            this.windowManager.defaultDisplay.getSize(size)
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , size.x , size.y))
        }

    }

您可以在https://github.com/joelmmx/take_photo_kotlin.git中获得更多详细信息

希望对您有帮助!

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