在向列表视图加载数据之前，如何在具有列表视图的活动中显示进度条（圆圈）

我ListView在第二篇文章activity.OnItemClick中提到了一个Web服务，并试图获取数据。之后，我将转到第三项活动，该活动也ListView具有对先前活动ListView项目的描述。

我想在填充此对话框之前显示一个进度对话框ListView。

我不知道该怎么做ListView？有人知道怎么做吗？

我的代码

ThirdActivity.java

   package com.google.iprotect;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.xmlpull.v1.XmlPullParserException;

import com.google.iprotect.layout.TitleBarLayout;

import android.app.Activity;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.res.ColorStateList;
import android.content.res.XmlResourceParser;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TextView;

public class ThirdActivity extends ListActivity implements OnItemClickListener{

    JSONArray jArray1,jArray2;
    String one,two,three,tablename;
    String color,r;
    JSONObject responseJSON;
    TitleBarLayout titlebarLayout;
    final ArrayList<Tables> arraylist = new ArrayList<Tables>();
    TextView tableName;
    ColorStateList colorStateList1;
    String email1,password1;
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.thirdactivity);

        ListView lv=getListView();
        lv.setOnItemClickListener(this);


        tablename=getIntent().getExtras().getString("Table Name");
        email1 = getIntent().getExtras().getString("email");
        password1 =getIntent().getExtras().getString("password");

        titlebarLayout = new TitleBarLayout(ThirdActivity.this);
        titlebarLayout.setLeftButtonText("go Back");
        titlebarLayout.setRightButtonText("Logout");
        titlebarLayout.setTitle(tablename);
        titlebarLayout.setLeftButtonSize(70,40);
        titlebarLayout.setRightButtonSize(70,40);
        //titlebarLayout.setLeftButtonLeftDrawable(R.drawable.refresh);

        //titlebarLayout.setRightButtonLeftDrawable(R.drawable.buttonrefresh);
        //titlebarLayout.setLeftButtonBackgroundColor(Color.rgb(255,255,255));
        //titlebarLayout.setRightButtonBackgroundColor(Color.rgb(34,49,64));
        //titlebarLayout.setLeftButtonTextColor(Color.rgb(255,255,255));
        //titlebarLayout.setRightButtonTextColor(Color.rgb(255,255,0));     

        XmlResourceParser parser1 =getResources().getXml(R.color.colorstatelist);


        try {
            colorStateList1 = ColorStateList.createFromXml(getResources(), parser1);
            titlebarLayout.setRightButtonTextColor(colorStateList1);
        } catch (XmlPullParserException e) {    
            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }

        OnClickListener listener = new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (v.getId() == R.id.left_button) {
                    Intent intent = new Intent(ThirdActivity.this,SecondActivity.class);
                    intent.putExtra("email", email1);
                    intent.putExtra("password", password1);
                    startActivity(intent);
                    finish();

                } else if (v.getId() == R.id.right_button) {
                    Intent intent = new Intent(ThirdActivity.this,
                            MainActivity.class);
                    //intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    intent.setFlags( Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                    ThirdActivity.this.startActivity(intent);

                }
            }
        };
        titlebarLayout.setLeftButtonOnClickListener(listener);
        titlebarLayout.setRightButtonOnClickListener(listener);


        updateTableList();




    }

    private void updateTableList() {
        // TODO Auto-generated method stub
        //final ProgressDialog pd1=ProgressDialog.show(this, "Calling Webservice", "Waiting...", true, false);

        final ProgressBar pbHeaderProgress = (ProgressBar) findViewById(R.id.pbHeaderProgress);

        new AsyncTask<Void, Void, Void>() {


            protected void onPreExecute() {
                // TODO Auto-generated method stub
                super.onPreExecute();
                pbHeaderProgress.setVisibility(View.VISIBLE);
            }



            protected Void doInBackground(Void... params) {
                r = invokeWebService1(tablename);
                //pd1.dismiss();

                try {
                    responseJSON = new JSONObject(r);
                    //json reading
                    jArray1 = responseJSON.getJSONArray("FirstThree");//get JSONArray jArray1 from JSONObject with name FirstThree
                    jArray2 = responseJSON.getJSONArray("Color");//get JSONArray jArray2 from JSONOobject with name Color
                    JSONObject json_data1 = null;
                    JSONObject json_data2 = null;

                    for (int i = 0; i < jArray1.length(); i++) {
                        json_data1 = jArray1.getJSONObject(i);//get JSONObject json_data1 from JSONArray at index i;
                        one = json_data1.getString("One");//get value from JSONObject json_data1 with key "One"
                        two = json_data1.getString("Two");
                        three = json_data1.getString("Three");
                        json_data2 = jArray2.getJSONObject(i);
                        color = json_data2.getString("color");//get value from JSONObject json_data2 with key "color"

                        Tables tables = new Tables();
                        //set value to Tables Class
                        tables.column1 = one;
                        tables.column2 = two;
                        tables.column3 = three;
                        tables.tableName=tablename;
                        tables.color=color;
                        //add Tables object into ArrayList<Tables>
                        arraylist.add(tables);

                        Log.i("ONE", json_data1.getString("One"));
                        Log.i("TWO", json_data1.getString("Two"));
                        Log.i("THREE", json_data1.getString("Three"));
                        Log.i("color",""+ json_data2.getString("color"));
                    }

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return null;
            }

            protected void onPostExecute(Void result) {
                pbHeaderProgress.setVisibility(View.GONE);

                //Custom Adapter for ListView
                TableDetailAdapter adaptor = new TableDetailAdapter(ThirdActivity.this,
                        R.layout.table_data_list_item, arraylist);
                setListAdapter(adaptor);
            }
        }.execute();

    }

    protected String invokeWebService1(String tablename2) {
        // TODO Auto-generated method stub
        String response = "";
        try {
            WebService webService = new WebService(
            "http://sphinx-solution.com/iProtect/api.php?");

            // Pass the parameters if needed
            Map<String, String> params = new HashMap<String, String>();
            params.put("action", "getTableRecords");
            params.put("tablename", tablename2);
            params.put("email", email1);
            params.put("password", password1);

            // Get JSON response from server the "" are where the method name
            // would normally go if needed example
            response = webService.WebGet("auth", params);

        } catch (Exception e) {
            Log.d("Error: ", e.getMessage());
        }
        return response;
    }


    public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
        // TODO Auto-generated method stub

        Log.v("", "Click ListItem Number "+position);
        Intent intent = new Intent(ThirdActivity.this,FourthActivity.class);
        intent.putExtra("Json", responseJSON.toString());//sending json Object as a string to next activity
        intent.putExtra("Table Name", tablename);
        intent.putExtra("email", email1);
        intent.putExtra("password", password1);
        intent.putExtra("Item No", position);
        startActivity(intent);

    }

}

thirdactivity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linlaHeaderProgress"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ThirdActivity" >

    <include
        android:id="@+id/titlebar"
        layout="@layout/titlebar_layout" />

    <ProgressBar
        android:id="@+id/pbHeaderProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="2" >
    </ProgressBar>

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="260dp" 
        android:layout_weight="5.04">
    </ListView>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="@dimen/titlebar_height"
        android:layout_alignParentBottom="true"
        android:background="@color/footer_bg_color"
        android:gravity="bottom"
        android:orientation="horizontal" >

        <include
            android:id="@+id/footer"
            android:layout_height="@dimen/titlebar_height"
            android:layout_gravity="bottom|center_horizontal"
            layout="@layout/footer_layout" />
    </LinearLayout>

</LinearLayout>

加载时，有几种显示进度条（圆圈）的方法activity。在您的情况下，其中有一个ListView。

在行动中

如果您使用ActionBar，则可以这样调用ProgressBar（这可能会在您的onCreate()

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);  
setProgressBarIndeterminateVisibility(true);

在显示完列表后，将其隐藏。

setProgressBarIndeterminateVisibility(false);

在布局中（XML）

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/linlaHeaderProgress"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone" >

        <ProgressBar
            android:id="@+id/pbHeaderProgress"
            style="@style/Spinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </ProgressBar>
    </LinearLayout>

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:cacheColorHint="@android:color/transparent"
        android:divider="#00000000"
        android:dividerHeight="0dp"
        android:fadingEdge="none"
        android:persistentDrawingCache="scrolling"
        android:smoothScrollbar="false" >
    </ListView>
</LinearLayout>

在您的活动（Java）中，我使用AsyncTask来获取列表数据。因此，在AsyncTask中，onPreExecute()我使用如下代码：

// CAST THE LINEARLAYOUT HOLDING THE MAIN PROGRESS (SPINNER)
LinearLayout linlaHeaderProgress = (LinearLayout) findViewById(R.id.linlaHeaderProgress);

@Override
protected void onPreExecute() {    
    // SHOW THE SPINNER WHILE LOADING FEEDS
    linlaHeaderProgress.setVisibility(View.VISIBLE);
}

然后在中onPostExecute()，将适配器设置为ListView：

@Override
protected void onPostExecute(Void result) {     
    // SET THE ADAPTER TO THE LISTVIEW
    lv.setAdapter(adapter);

    // CHANGE THE LOADINGMORE STATUS TO PERMIT FETCHING MORE DATA
    loadingMore = false;

    // HIDE THE SPINNER AFTER LOADING FEEDS
    linlaHeaderProgress.setVisibility(View.GONE);
}

编辑：这就是它在加载几个应用程序时在我的应用程序中的样子 ListViews

您可以更轻松地完成此操作。
来源：http : //www.tutorialspoint.com/android/android_loading_spinner.htm
它帮助了我。

布局：

<ProgressBar
   android:id="@+id/progressBar1"
   style="?android:attr/progressBarStyleLarge"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerHorizontal="true" />

在xml中定义后，您必须通过ProgressBar类在java文件中获取其引用。其语法如下：

private ProgressBar spinner;
spinner = (ProgressBar)findViewById(R.id.progressBar1);

之后，您可以使其消失，并在需要时通过setVisibility方法将其恢复。其语法如下：

spinner.setVisibility(View.GONE);
spinner.setVisibility(View.VISIBLE);

我将其用于列表视图加载可能会有所帮助。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="5dp"
android:paddingRight="5dp" >

<LinearLayout
    android:id="@+id/progressbar_view"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <ProgressBar
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|center_horizontal" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|center_horizontal"
            android:text="Loading data..." />
    </LinearLayout>

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#C0C0C0" />
</LinearLayout>

<ListView
    android:id="@+id/listView"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_marginTop="1dip"
    android:visibility="gone" />

</RelativeLayout>

我的MainActivity类是

public class MainActivity extends Activity {
ListView listView;
LinearLayout layout;
List<String> stringValues;
ArrayAdapter<String> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.listView);
    layout = (LinearLayout) findViewById(R.id.progressbar_view);

    stringValues = new ArrayList<String>();

    adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, stringValues);

    listView.setAdapter(adapter);
    new Task().execute();
}

class Task extends AsyncTask<String, Integer, Boolean> {
    @Override
    protected void onPreExecute() {
        layout.setVisibility(View.VISIBLE);
        listView.setVisibility(View.GONE);
        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Boolean result) {
        layout.setVisibility(View.GONE);
        listView.setVisibility(View.VISIBLE);
        adapter.notifyDataSetChanged();
        super.onPostExecute(result);
    }

    @Override
    protected Boolean doInBackground(String... params) {
        stringValues.add("String 1");
        stringValues.add("String 2");
        stringValues.add("String 3");
        stringValues.add("String 4");
        stringValues.add("String 5");

        try {
            Thread.sleep(3000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}
}

此活动显示进度3秒钟，然后将显示listview，而不是将数据静态添加到stringValues列表中，您可以在doInBackground（）中从服务器获取数据并显示它。

请在tutorialspoint.com使用示例。整个实现只需要几行代码，而无需更改xml文件。希望这可以帮助。

步骤1：导入库

import android.app.ProgressDialog;

步骤2：声明ProgressDialog全局变量

ProgressDialog loading = null;

步骤3：启动新的ProgressDialog并使用以下属性（请注意，该示例仅涵盖基本的圆加载条，而没有实时进度状态）。

loading = new ProgressDialog(v.getContext());
loading.setCancelable(true);
loading.setMessage(Constant.Message.AuthenticatingUser);
loading.setProgressStyle(ProgressDialog.STYLE_SPINNER);

步骤4：如果使用的是AsyncTasks，则可以开始在onPreExecute方法中显示对话框。否则，只需将代码放在按钮onClick事件的开头。

loading.show();

步骤5：如果使用的是AsyncTasks，则可以通过将代码放在onPostExecute方法中来关闭进度对话框。否则，只需在关闭按钮onClick事件之前放置代码。

loading.dismiss();

在我的Nexus 5 android v4.0.3上进行了测试。祝好运！

您要扩展ListActivity吗？

如果是这样，请在您的xml中放置一个带有以下行的循环进度对话框

<ProgressBar
android:id="@android:id/empty"
...other stuff...
/>

现在，进度指示器将显示，直到您拥有所有列表视图信息，并设置适配器。此时，它将返回到列表视图，进度栏将消失。

ProgressDialog dialog = ProgressDialog.show(Example.this, "", "Loading...", true);

在drawable中创建一个任何名称的XML文件（例如progressBar.xml），并添加<color name="silverGrey">#C0C0C0</color>color.xml。

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="720" >

    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="6"
        android:useLevel="false" >
        <size
            android:height="200dip"
            android:width="300dip" />

        <gradient
            android:angle="0"
            android:endColor="@color/silverGrey"
            android:startColor="@android:color/transparent"
            android:type="sweep"
            android:useLevel="false" />

    </shape>
</rotate>

现在在您的listView所在的xml文件中，添加以下代码：

 <ListView
            android:id="@+id/list_form_statusMain"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </ListView>

        <ProgressBar
            android:id="@+id/progressBar"
            style="@style/CustomAlertDialogStyle"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:layout_centerInParent="true"
            android:layout_gravity="center_horizontal"
            android:indeterminate="true"
            android:indeterminateDrawable="@drawable/circularprogress"
            android:visibility="gone"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"/>

在AsyncTask中的方法：

@Override
protected void onPreExecute()
{
    progressbar_view.setVisibility(View.VISIBLE);

    // your code
}

并在onPostExecute中：

@Override
protected void onPostExecute(String s)
{
    progressbar_view.setVisibility(View.GONE);

    //your code
}

您可以将添加ProgressBar到listview页脚：

private ListView listview;
private ProgressBar progressBar;

...

progressBar = (ProgressBar) LayoutInflater.from(this).inflate(R.layout.progress_bar, null);

listview.addFooterView(progressBar);

layout / progress_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<ProgressBar xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/load_progress"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:indeterminate="true"
     />

当数据加载到适配器视图调用时：

        listview.removeFooterView(progressBar);

我建议您在使用listview或recyclerview时使用SwipeRefreshLayout。像这样

    <android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swiperefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/card_recycler_view"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

</android.support.v4.widget.SwipeRefreshLayout>

仅包装您的视图，这将在加载数据或向下滑动屏幕时创建刷新动画，就像我们在许多应用中一样。
以下是使用方法的文档：
https : //developer.android.com/training/swipe/add-swipe-in​​terface.html https://developer.android.com/training/swipe/respond-refresh-request。 html

编码愉快！

在“点击”选项或您的需要上使用“此范围内”按钮：

final ProgressDialog progressDialog;
progressDialog = new ProgressDialog(getApplicationContext());
progressDialog.setMessage("Loading..."); // Setting Message
progressDialog.setTitle("ProgressDialog"); // Setting Title
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); // Progress Dialog Style Spinner
progressDialog.show(); // Display Progress Dialog
progressDialog.setCancelable(false);
new Thread(new Runnable() {
    public void run() {
        try {
            Thread.sleep(5000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        progressDialog.dismiss();
    }
}).start();

工艺栏：

依赖关系：

     implementation 'com.github.castorflex.smoothprogressbar:library:1.0.0'

XML：

     <fr.castorflex.android.smoothprogressbar.SmoothProgressBar
        xmlns:android="http://schemas.android.com/apk/res/android"                
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/myProcessbar"
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:indeterminate="true" />

在Res-> color

      <color name="pocket_color_1">#ff1635</color>
      <integer-array name="pocket_background_colors">
          <item>@color/pocket_color_1</item>
      </integer-array>

      <color name="pocket_color_stop">#00ff00</color>
      <integer-array name="pocket_background_stop">
          <item>@color/pocket_color_stop</item>
      </integer-array>

在主要：

      public class MainActivity extends AppCompatActivity{
        SmoothProgressBar smoothProgressBar;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          smoothProgressBar=findViewById(R.id.myProcessbar);
          showProcessBar();
          stopAnimation();    // call when required to stop process
        }

        public void showProcessBar(){
          smoothProgressBar.setVisibility(View.VISIBLE);
          smoothProgressBar.setIndeterminateDrawable(new SmoothProgressDrawable.Builder(getApplicationContext())
            .interpolator(new AccelerateInterpolator())
            .progressiveStart(true)
            .progressiveStopSpeed(1000)
            .build());
          smoothProgressBar.setSmoothProgressDrawableBackgroundDrawable(
          SmoothProgressBarUtils.generateDrawableWithColors(
                    getResources().getIntArray(R.array.pocket_background_colors),
                    ((SmoothProgressDrawable)  smoothProgressBar.getIndeterminateDrawable()).getStrokeWidth()));
        }

        public void stopAnimation(){
          smoothProgressBar.setSmoothProgressDrawableBackgroundDrawable(
          SmoothProgressBarUtils.generateDrawableWithColors(
                    getResources().getIntArray(R.array.pocket_background_stop),
                    ((SmoothProgressDrawable)  smoothProgressBar.getIndeterminateDrawable()).getStrokeWidth()));
          smoothProgressBar.progressiveStop();
          Handler handler=new Handler();
          handler.postDelayed(new Runnable() {
            @Override
            public void run() {
               smoothProgressBar.animate().alpha(0.0f).setDuration(6000).translationY(1000);
               smoothProgressBar.setVisibility(View.GONE);
            }
          },1000);
}

      }

我正在使用这个：

loading = ProgressDialog.show(example.this,"",null, true, true);