Android：膨胀 PreferenceScreen 时出错
Android: Error inflating PreferenceScreen
我已经看到其他一些与此问题类似的参考资料，但尚未找到解决我的问题的方法。
我曾经使用 android.preference.Preference，但最近为了使用 SeekBarPreference 而转移到了 androidx。
现在，当我尝试给首选项屏幕充气时，出现以下错误：
2021-11-17 20:57:20.623 18270-18270/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project.test, PID: 18270
android.view.InflateException: Binary XML file line #1: Error inflating class (not found)android.support.v7.preference.PreferenceScreen
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:287)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.ClassNotFoundException: android.support.v7.preference.PreferenceScreen
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:454)
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:214)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.ClassNotFoundException: android.support.v7.preference.PreferenceScreen
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:454)
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:214)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
我的 SettingsFragment.java 文件的摘录（在 setPreferencesFromResource 行报告了错误）：
public class SettingsFragment extends PreferenceFragmentCompat {
Utilities utils = new Utilities();
Context context = ProjectGlobal.getAppContext();
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor settingsEditor = settings.edit()
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.pref_general, rootKey);
Preference pfPermissionsReset = findPreference("permissionsPrompt");
Preference pfBatterySaving = findPreference("batteryPrompt");
final SeekBarPreference pfVolumeValue = (SeekBarPreference) findPreference("sbVolume");
final SwitchPreference pfGlobalVolume = (SwitchPreference) findPreference("chkUseGlobalVolume");
//init global volume control
pfVolumeValue.setMax(100);
pfVolumeValue.setMin(0);
来自我的 pref_general.xml 偏好布局：
<android.support.v7.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.preference.PreferenceCategory
android:summary="App Settings"
android:title="GENERAL" />
<android.support.v7.preference.SwitchPreference
android:key="chkNotificationListener"
android:summary="This option allows you to disable the app without uninstalling the application. [Default: On]"
android:title="Notification Listener"
android:defaultValue="true"
/>
<android.support.v7.preference.SwitchPreference
android:key="chkHideBanner"
android:summary="This option hides the banner notification at the top of the screen. Please note, this may impact the reliability of the application if disabled! [Default: Off]"
android:title="Hide Banner Notification"
android:defaultValue="false"
/>
<android.support.v7.preference.Preference android:title="Check Battery Saving"
android:key="batteryPrompt"
android:summary="Tap here to check that the app is allowed to run in the background/during startup on your device" />
<android.support.v7.preference.PreferenceCategory
android:summary="Audio"
android:title="AUDIO"/>
<android.support.v7.preference.SwitchPreference
android:key="chkOnlyUseSpeaker"
android:summary="This option will attempt to play audio alerts from the device loudspeaker only [Default: Off]"
android:title="Only Use Speaker"
android:defaultValue="false"
/>
<android.support.v7.preference.SwitchPreference
android:key="chkUseGlobalVolume"
android:summary="This option will override any volume settings set in each rule [Default: Off]"
android:title="Use Global Volume"
android:defaultValue="false"
/>
<android.support.v7.preference.SeekBarPreference
android:key="sbVolume"
android:title="Global Volume"
android:dependency="chkUseGlobalVolume"
android:max="100"
android:defaultValue="50"
/>
/>
<android.support.v7.preference.PreferenceCategory
android:summary="Security"
android:title="SECURITY"/>
<android.support.v7.preference.Preference android:title="Check Permissions"
android:key="@string/permissionsPrompt"
android:summary="Tap here to re-check permissions" />
</android.support.v7.preference.PreferenceScreen>
来自我的 Launcher.java:
public class Launcher extends AppCompatActivity implements SettingsFragment.OnFragmentInteractionListener,RuleFragment.OnFragmentInteractionListener,HelpFragment.OnFragmentInteractionListener {
RuleFragment ruleFragment = new RuleFragment();
SettingsFragment prefsFragment = new SettingsFragment();
HelpFragment helpFragment = new HelpFragment();
Utilities utils = new Utilities();
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
getSupportFragmentManager().beginTransaction().remove(helpFragment).commit();
getSupportFragmentManager().beginTransaction().remove(prefsFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,ruleFragment).commit();
return true;
case R.id.navigation_settings:
getSupportFragmentManager().beginTransaction().remove(ruleFragment).commit();
getSupportFragmentManager().beginTransaction().remove(helpFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,prefsFragment).commit();
return true;
case R.id.navigation_help:
getSupportFragmentManager().beginTransaction().remove(prefsFragment).commit();
getSupportFragmentManager().beginTransaction().remove(ruleFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,helpFragment).commit();
return true;
}
return false;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Launcher.context = getApplicationContext();
Utilities utils = new Utilities();
//initiate home screen
setContentView(R.layout.main);
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,ruleFragment).commit();
}
我的 main.xml 启动器布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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="match_parent">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/main_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layout_above="@+id/navigation"
app:titleTextColor="@color/Black"
>
<FrameLayout
android:id="@+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="@menu/navigation" />
</RelativeLayout>
设法解决了这个问题。这是因为我没有将pref_general.xml内的android.support.v7.preference更新为androidx.preference.
这样做之后，效果很好！
我已经看到其他一些与此问题类似的参考资料，但尚未找到解决我的问题的方法。
我曾经使用 android.preference.Preference，但最近为了使用 SeekBarPreference 而转移到了 androidx。
现在，当我尝试给首选项屏幕充气时，出现以下错误：
2021-11-17 20:57:20.623 18270-18270/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project.test, PID: 18270
android.view.InflateException: Binary XML file line #1: Error inflating class (not found)android.support.v7.preference.PreferenceScreen
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:287)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.ClassNotFoundException: android.support.v7.preference.PreferenceScreen
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:454)
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:214)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.ClassNotFoundException: android.support.v7.preference.PreferenceScreen
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:454)
at androidx.preference.PreferenceInflater.createItem(PreferenceInflater.java:214)
at androidx.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:277)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:151)
at androidx.preference.PreferenceInflater.inflate(PreferenceInflater.java:109)
at androidx.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:216)
at androidx.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:377)
at com.project.test.SettingsFragment.onCreatePreferences(SettingsFragment.java:33)
at androidx.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:160)
at com.project.test.SettingsFragment.onCreate(SettingsFragment.java:25)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1255)
at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1138)
at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:136)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1989)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
我的 SettingsFragment.java 文件的摘录（在 setPreferencesFromResource 行报告了错误）：
public class SettingsFragment extends PreferenceFragmentCompat {
Utilities utils = new Utilities();
Context context = ProjectGlobal.getAppContext();
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor settingsEditor = settings.edit()
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.pref_general, rootKey);
Preference pfPermissionsReset = findPreference("permissionsPrompt");
Preference pfBatterySaving = findPreference("batteryPrompt");
final SeekBarPreference pfVolumeValue = (SeekBarPreference) findPreference("sbVolume");
final SwitchPreference pfGlobalVolume = (SwitchPreference) findPreference("chkUseGlobalVolume");
//init global volume control
pfVolumeValue.setMax(100);
pfVolumeValue.setMin(0);
来自我的 pref_general.xml 偏好布局：
<android.support.v7.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.preference.PreferenceCategory
android:summary="App Settings"
android:title="GENERAL" />
<android.support.v7.preference.SwitchPreference
android:key="chkNotificationListener"
android:summary="This option allows you to disable the app without uninstalling the application. [Default: On]"
android:title="Notification Listener"
android:defaultValue="true"
/>
<android.support.v7.preference.SwitchPreference
android:key="chkHideBanner"
android:summary="This option hides the banner notification at the top of the screen. Please note, this may impact the reliability of the application if disabled! [Default: Off]"
android:title="Hide Banner Notification"
android:defaultValue="false"
/>
<android.support.v7.preference.Preference android:title="Check Battery Saving"
android:key="batteryPrompt"
android:summary="Tap here to check that the app is allowed to run in the background/during startup on your device" />
<android.support.v7.preference.PreferenceCategory
android:summary="Audio"
android:title="AUDIO"/>
<android.support.v7.preference.SwitchPreference
android:key="chkOnlyUseSpeaker"
android:summary="This option will attempt to play audio alerts from the device loudspeaker only [Default: Off]"
android:title="Only Use Speaker"
android:defaultValue="false"
/>
<android.support.v7.preference.SwitchPreference
android:key="chkUseGlobalVolume"
android:summary="This option will override any volume settings set in each rule [Default: Off]"
android:title="Use Global Volume"
android:defaultValue="false"
/>
<android.support.v7.preference.SeekBarPreference
android:key="sbVolume"
android:title="Global Volume"
android:dependency="chkUseGlobalVolume"
android:max="100"
android:defaultValue="50"
/>
/>
<android.support.v7.preference.PreferenceCategory
android:summary="Security"
android:title="SECURITY"/>
<android.support.v7.preference.Preference android:title="Check Permissions"
android:key="@string/permissionsPrompt"
android:summary="Tap here to re-check permissions" />
</android.support.v7.preference.PreferenceScreen>
来自我的 Launcher.java:
public class Launcher extends AppCompatActivity implements SettingsFragment.OnFragmentInteractionListener,RuleFragment.OnFragmentInteractionListener,HelpFragment.OnFragmentInteractionListener {
RuleFragment ruleFragment = new RuleFragment();
SettingsFragment prefsFragment = new SettingsFragment();
HelpFragment helpFragment = new HelpFragment();
Utilities utils = new Utilities();
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
getSupportFragmentManager().beginTransaction().remove(helpFragment).commit();
getSupportFragmentManager().beginTransaction().remove(prefsFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,ruleFragment).commit();
return true;
case R.id.navigation_settings:
getSupportFragmentManager().beginTransaction().remove(ruleFragment).commit();
getSupportFragmentManager().beginTransaction().remove(helpFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,prefsFragment).commit();
return true;
case R.id.navigation_help:
getSupportFragmentManager().beginTransaction().remove(prefsFragment).commit();
getSupportFragmentManager().beginTransaction().remove(ruleFragment).commit();
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,helpFragment).commit();
return true;
}
return false;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Launcher.context = getApplicationContext();
Utilities utils = new Utilities();
//initiate home screen
setContentView(R.layout.main);
getSupportFragmentManager().beginTransaction().replace(R.id.contentFrame,ruleFragment).commit();
}
我的 main.xml 启动器布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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="match_parent">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/main_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layout_above="@+id/navigation"
app:titleTextColor="@color/Black"
>
<FrameLayout
android:id="@+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="@menu/navigation" />
</RelativeLayout>
设法解决了这个问题。这是因为我没有将pref_general.xml内的android.support.v7.preference更新为androidx.preference.
这样做之后，效果很好！