有什么方法可以在首选项屏幕的底部添加一个按钮,并使其在滚动时正常工作?
有什么方法可以在首选项屏幕的底部添加一个按钮,并使其在滚动时正常工作?
Answers:
还有另一种用于定制首选项外观的解决方案。
使用按钮或您想要添加到标准首选项的任何内容设计标准的XML布局。ListView
在您的布局中添加一个,并为其指定ID @android:id/list
。
假设我们称为布局文件res/layout/main.xml
。它可能看起来像这样:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button android:text="This is a button on top of all preferences."
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ListView android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
在中PreferenceActivity
,将这两行添加到您的onCreate
:
addPreferencesFromResource(R.xml.preferences);
setContentView(R.layout.main);
然后ListView
,版式中的会被中的常规方式定义的首选项所取代res/xml/preferences.xml
。
我知道这有点晚了,但是我刚刚找到了一个比Max所称赞的解决方案更好的解决方案。
您可以简单地向PreferenceActivity的ListView添加页脚(或者,如果您希望按钮位于顶部,则为页眉),如下所示:
public class MyActivity extends PreferenceActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
ListView v = getListView();
v.addFooterView(new Button(this));
}
}
我希望这可以帮助别人。
ListView
使用PreferenceFragment :(
PreferenceFragment
它有自己的列表),但是我通过创建一个Preference
并Intent
在上面设置一个来解决它。有没有必要建立(在我的情况下,至少)一个按钮
下面的示例将在页面底部呈现一个按钮(以防仍然有人感兴趣)。
在使用LinearLayout的情况下,您还可以应用权重;这是必需的,因为Listview设置为* fill_parent *。我通常通过添加* android:layout_weight *来做到这一点:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_weight="10"/>
<Button android:text="This is a button on top of all preferences."
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_weight="1"/>
</LinearLayout>
以下说明可能不是100%,但可以帮助您理解...
+-- View Port (linear layout)
| +-- List View (this is where the preferences will go)
| |
| |
| +--
+--
+--
| Button (which was pushed out of view by the fillparent of ListView
+--
您也可以说,因为Button没有重量;该按钮将以0dp高度渲染。
现在添加了layout_weigths,它将使按钮呈现在视图中
+-- View Port (linear layout)
| +-- List View (this is where the preferences will go)
| |
| |
| +--
| +--
| | Button (which was pushed out of view by the fillparent of ListView
| +--
+--
实际上,有一个解决方案。我希望这是一个代码,对任何人都有用。屏幕底部看起来像3个选项和2个按钮,与屏幕分辨率无关(最低定位为240)
package com.myapplication.gui;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.view.Display;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ScrollView;
import com.myproject.general.HeightListView;
import com.myapplication.R;
public class FilterActivity extends PreferenceActivity {
private LinearLayout rootView;
private LinearLayout buttonView;
private Button buttonDone;
private Button buttonRevert;
private ListView preferenceView;
private LinearLayout gradientView;
private ScrollView scrollRoot;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int height = display.getHeight();
int width = height > 240 ? display.getWidth() : display.getWidth() - 4;
scrollRoot = new ScrollView(this);
scrollRoot.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
rootView = new LinearLayout(this);
rootView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
rootView.setOrientation(LinearLayout.VERTICAL);
buttonView = new LinearLayout(this);
buttonView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
buttonView.setOrientation(LinearLayout.HORIZONTAL);
buttonView.setGravity(Gravity.BOTTOM);
gradientView = new LinearLayout(this);
gradientView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
gradientView.setOrientation(LinearLayout.HORIZONTAL);
gradientView.setBackgroundResource(R.drawable.gradient);
gradientView.setPadding(0, 5, 0, 0);
gradientView.setBackgroundResource(R.drawable.gradient);
buttonDone = new Button(this);
buttonDone.setText(R.string.filterButton_Done);
buttonDone.setLayoutParams(new LayoutParams(width/2, LayoutParams.WRAP_CONTENT));
gradientView.addView(buttonDone);
buttonRevert = new Button(this);
buttonRevert.setText(R.string.filterButton_Revert);
buttonRevert.setLayoutParams(new LayoutParams(width/2, LayoutParams.WRAP_CONTENT));
gradientView.addView(buttonRevert);
buttonView.addView(gradientView);
preferenceView = new HeightListView(this);
preferenceView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
preferenceView.setId(android.R.id.list);
PreferenceScreen screen = createPreferenceHierarchy();
screen.bind(preferenceView);
preferenceView.setAdapter(screen.getRootAdapter());
rootView.addView(preferenceView);
rootView.addView(buttonView);
if (height > 240) {
this.setContentView(rootView);
}
else {
scrollRoot.addView(rootView);
this.setContentView(scrollRoot);
}
setPreferenceScreen(screen);
}
private PreferenceScreen createPreferenceHierarchy() {
PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);
PreferenceScreen pref1 = getPreferenceManager().createPreferenceScreen(this);
pref1.setKey("pref1");
pref1.setTitle("Title");
pref1.setSummary("Summary");
root.addPreference(pref1);
PreferenceScreen pref2 = getPreferenceManager().createPreferenceScreen(this);
pref2.setKey("pref2");
pref2.setTitle("Title");
pref2.setSummary("Summary");
root.addPreference(pref2);
PreferenceScreen pref3 = getPreferenceManager().createPreferenceScreen(this);
pref3.setKey("pref3");
pref3.setTitle("Title");
pref3.setSummary("Summary");
root.addPreference(pref3);
return root;
}
}
您只需要在常规Activity中使用PreferenceFragment并将按钮添加到Activity布局中即可。
public class SettingActivity extends Activity {
UserProfileViewModel userProfileViewModel = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setting);
getFragmentManager().beginTransaction()
.replace(R.id.content, new SettingsFragment())
.commit();
}
private class SettingsFragment extends PreferenceFragment {
public SettingsFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.pref_main);
}
}
}
SettingActivity.java
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/buttonSave"/>
<Button
android:id="@+id/buttonSave"
android:text="Save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
activity_setting
buttonSave
:)
这就是ronny示例中的活动中的代码。我的目的是在屏幕底部放置一个菜单。
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.prefs);
addPreferencesFromResource(R.xml.prefs);
/* LayoutInflater CX = getLayoutInflater();
CX.inflate(R.layout.main,null);*/
// TODO Auto-generated method stub
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="@dimens/listview_height" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="This is a button on top of all preferences." />
</RelativeLayout>
我引用@Ronnie,使用RelativeLayout并为listview的layout_height设置一个高度,然后设置按钮的layout_alignParentBottom =“ true”,它可以在PreferenceScreen的底部渲染一个按钮;然后使用@Max的方式。它可以满足我的需求。
也可以将动作按钮添加到动作栏,以采用Android标准方法。
public class PrefActivity extends PreferenceActivity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.preference_header_menu, menu);
return super.onCreateOptionsMenu(menu);
}
}
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/action_add"
android:icon="@drawable/ic_menu_add_dark"
android:title="@string/menu_action_add_title"
android:showAsAction="always" />
</menu>
首选项活动中的自定义视图 这将有助于在Android的PreferenceActivity中添加自定义视图。
创建main.xml,唯一必要的视图是ID为的ListView android:id="@android:id/list"
。
<?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" android:weightSum="1">
<ListView
android:id="@android:id/list"
android:layout_weight="1"
android:layout_width="fill_parent"
android:layout_height="0dp">
</ListView>
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
创建CustomPreferenceActivity.java
public class CustomPreferenceActivity extends PreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addPreferencesFromResource(R.xml.settings);
//setup any other views that you have
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText("View Added");
}
}
以下是将可点击按钮添加到首选项屏幕的简单解决方案。这很容易,因为首选项已经在android:widgetLayout中保留了空间,并且按钮可以通过android:onClick传递点击。
首先使用内容创建一个button.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:text="BUTTON"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button"
android:onClick="onButtonClick"/>
</LinearLayout>
现在在您的preferences.xml中,添加首选项
<Preference
android:key="button"
android:title="Title"
android:summary="Summary"
android:widgetLayout="@layout/button" />
您的PreferenceActivity现在只需要包含一个onButtonClick成员
public class MainActivity extends PreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.main_preferences);
}
public void onButtonClick(View v) {
Log.d("Button", "Yeah, button was clicked");
}
}
preferences.xml:
<Preference
android:key="clearAllData"
android:title="@string/settings_clear_all_data">
</Preference>
SettingsFragment.java:
public class SettingsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
Preference clearAllData = (Preference) findPreference("clearAllData");
// setup buttons
final Context context = getActivity();
clearAllData.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
@Override
public boolean onPreferenceClick(Preference preference) {
...
}
}
}