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法律学如果活动崩溃，如何清除 Android 通知？
此示例演示了如果活动崩溃，如何清除 Android 通知
步骤 1 − 在 Android Studio 中创建一个新项目，转至文件 ⇒ 新建项目，然后填写所有必需的详细信息以新建一个项目。
步骤 2 − 添加以下代码到 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 :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 − 添加以下代码到 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(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 − 添加以下代码到 src/CrashHandler 中。
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) ;
}
}步骤 5 − 添加以下代码到 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" /> <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
更新于： 30-07-2019
168 次浏览
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