如果活动崩溃，如何清除Android通知？
此示例演示有关如何在活动崩溃时清除Android通知
步骤1-在AndroidStudio中创建一个新项目，转到File⇒NewProject并填写所有必需的详细信息以创建一个新项目。
步骤2- 将以下代码添加到res/layout/activity_main.xml。
<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android"
xmlns: tools = "http://schemas.android.com/tools"
android :layout_width = "match_parent"
android :layout_height = "match_parent"
android :padding = "16dp"
tools :context = ".MainActivity" >
<Button
android :id = "@+id/btnCreateNotification"
android :layout_width = "wrap_content"
android :layout_height = "wrap_content"
android :layout_alignParentStart = "true"
android :layout_alignParentEnd = "true"
android :layout_centerInParent = "true"
android :text = "Create Notification" />
</RelativeLayout>步骤3-将以下代码添加到src/MainActivity。
package app.nhooo.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.app.PendingIntent ;
import android.content.Intent ;
import android.os.Bundle ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
public class MainActivity extends AppCompatActivity {
public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
private final static String default_notification_channel_id = "default" ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;
setContentView(R.layout. activity_main ) ;
}
public void createNotification (View view) {
Intent notificationIntent = new Intent(getApplicationContext() , MainActivity. class ) ;
notificationIntent.putExtra( "fromNotification" , true ) ;
notificationIntent.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP | Intent. FLAG_ACTIVITY_SINGLE_TOP ) ;
PendingIntent pendingIntent = PendingIntent. getActivity ( this, 0 , notificationIntent , 0 ) ;
NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
mBuilder.setContentTitle( "My Notification" ) ;
mBuilder.setContentIntent(pendingIntent) ;
mBuilder.setColor(getColor(R.color. colorPrimary )) ;
mBuilder.setContentText( "Notification Listener Service Example" ) ;
mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
mBuilder.setAutoCancel( true ) ;
if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
int importance = NotificationManager. IMPORTANCE_HIGH ;
NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
assert mNotificationManager != null;
mNotificationManager.createNotificationChannel(notificationChannel) ;
}
assert mNotificationManager != null;
mNotificationManager.notify(( int ) System. currentTimeMillis () ,
mBuilder.build()) ;
}
}步骤4-将以下代码添加到src/CrashHandler。
package app.nhooo.com.notifyme ;
import android.app.NotificationManager ;
import android.content.Context ;
public class CrashHandler implements Thread.UncaughtExceptionHandler {
private static final int NOTIFICATION_ID = 12345 ;
private Thread.UncaughtExceptionHandler defaultUEH ;
private NotificationManager notificationManager ;
public CrashHandler (Context context) {
this . defaultUEH = Thread. getDefaultUncaughtExceptionHandler () ;
notificationManager = (NotificationManager) context.getSystemService(Context. NOTIFICATION_SERVICE ) ;
}
public void uncaughtException (Thread t , Throwable e) {
if ( notificationManager != null ) {
try {
notificationManager .cancel( NOTIFICATION_ID ) ;
} catch (Throwable ex) {
ex.printStackTrace() ;
}
}
notificationManager = null;
defaultUEH .uncaughtException(t , e) ;
}
}第5步-将以下代码添加到AndroidManifest.xml
<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
package = "app.nhooo.com.notifyme" >
<uses-permission android :name = "android.permission.VIBRATE" />
<application
android :allowBackup = "true"
android :icon = "@mipmap/ic_launcher"
android :label = "@string/app_name"
android :roundIcon = "@mipmap/ic_launcher_round"
android :supportsRtl = "true"
android :theme = "@style/AppTheme" >
<activity android :name = ".MainActivity" >
<intent-filter>
<action android :name = "android.intent.action.MAIN" />
<category android :name = "android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>点击 这里 下载项目代码