如何在 Android 中使用 Notification.deleteIntent？

本示例演示了如何在 Android 中使用 Notification.deleteIntent

步骤 1 − 在 Android Studio 中创建一个新项目，转至 File ⇒ New Project，并填写所有必填项以创建新项目。

步骤 2 − 将以下代码添加到 res/layout/activity_main.xml 中。

<? 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:onClick = "createNotification"
      android:text = "create notification"
      android:layout_centerInParent= "true"
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content" />
</RelativeLayout>

步骤 3 − 将以下代码添加到 src/MainActivity 中。

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(getApplicationContext() , default_notification_channel_id ) ;
      mBuilder.setContentTitle( "My Notification" ) ;
      mBuilder.setContentIntent(pendingIntent) ;
      mBuilder.setContentText( "Notification Listener Service Example" ) ;
      mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
      mBuilder.setAutoCancel( true ) ;
      mBuilder.setDeleteIntent(getDeleteIntent()) ;
      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()) ;
   }
   protected PendingIntent getDeleteIntent () {
      Intent intent = new Intent(MainActivity. this, NotificationBroadcastReceiver. class ) ;
      intent.setAction( "notification_cancelled" ) ;
      return PendingIntent. getBroadcast (MainActivity. this, 0 , intent , PendingIntent. FLAG_CANCEL_CURRENT ) ;
   }
}

步骤 4 − 将以下代码添加到 src/NotificationBroadcastReceiver 中

package app.tutorialspoint.com.notifyme ;
import android.content.BroadcastReceiver ;
import android.content.Context ;
import android.content.Intent ;
import android.widget.Toast ;
public class NotificationBroadcastReceiver extends BroadcastReceiver {
   @Override
   public void onReceive (Context context , Intent intent) {
      String action = intent.getAction() ;
      if (action.equals( "notification_cancelled" )) {
         Toast. makeText (context , "Notification Removed" , Toast. LENGTH_SHORT ).show() ;
      }
   }
}

步骤 5 − 将以下代码添加到 AndroidManifest.xml 中

<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
   package= "app.tutorialspoint.com.notifyme" >
   <uses-permission android :name = "android.permission.VIBRATE" />
   <uses-permission android :name = "android.permission.RECEIVE_BOOT_COMPLETED" />
   <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">
      <receiver
         android :name = ".NotificationBroadcastReceiver"
         android :enabled = "true"
         android :exported = "true" >
         </receiver>
      <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>

让我们尝试运行你的应用程序。我假设你已经将实际 Android 移动设备与电脑连接好。要通过 Android Studio 运行应用，请打开项目的一个活动文件，然后单击工具栏中的运行图标。选择你的移动设备作为选项，然后检查会显示默认界面的移动设备 −