アクティビティがクラッシュした場合にAndroidの通知をクリアするにはどうすればよいですか？

この例は、アクティビティがクラッシュした場合にAndroid通知をクリアする方法について示しています

ステップ1 − Android Studioで新しいプロジェクトを作成し、[ファイル]⇒[新しいプロジェクト]に移動して、新しいプロジェクトを作成するために必要なすべての詳細を入力します。

ステップ2 −次のコードをres / layout/activity_main.xmlに追加します。

<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "https://schemas.android.com/apk/res/android"
   xmlns: tools = "https://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>

ステップ3 −次のコードをsrc/MainActivityに追加します。

package app.tutorialspoint.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()) ;
   }
}

ステップ4 −次のコードをsrc/CrashHandlerに追加します。

package app.tutorialspoint.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) ;
   }
}

ステップ5 −次のコードをAndroidManifest.xmlに追加します

<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "https://schemas.android.com/apk/res/android"
   package = "app.tutorialspoint.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>