如何解决通知中的 PendingIntent 不会恢复服务显示 java.lang.NullPointerException
我创建了一个前台服务,因此使用 PendingIntents 实现了通知。
通知也会显示。
但是暂停和停止按钮不起作用。当我点击它时,应用程序崩溃。当我点击播放时,我的日志会被打印出来,这意味着它工作正常。
它返回的错误是这样的:
2021-06-20 23:40:24.167 25285-25285/com.example.startedservice E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.startedservice,PID: 25285
java.lang.RuntimeException: Unable to start service com.example.startedservice.Service.MusicPlayerBoundService@2cdba7d with Intent { flg=0x10000000 cmp=com.example.startedservice/.Service.MusicPlayerBoundService bnds=[382,1495][698,1639] }: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4001)
at android.app.ActivityThread.access$1800(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1896)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7178)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:503)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
at com.example.startedservice.Service.MusicPlayerBoundService.onStartCommand(MusicPlayerBoundService.java:52)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3968)
at android.app.ActivityThread.access$1800(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1896)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7178)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:503)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
我的 onStartCommand() 方法:
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public int onStartCommand(Intent intent,int flags,int startId) {
String temp =intent.getAction();
switch(temp){
case "PLAY": {
Log.d("MyTag","play called");
play();
break;
}
case "PAUSE": {
Log.d("MyTag","pause called");
pause();
break;
}
case "START": {
createNotificationChannel();
showNotification();
break;
}
case "STOP": {
stopForeground(true);
stopSelf();
break;
}
default:
stopSelf();
}
Log.d("MyTag","onStartCommand Called");
return START_REDELIVER_INTENT;
}
createNotificationChannel():
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel serviceChannel = new NotificationChannel(
"ForegroundServiceChannel","Foreground Service Channel",NotificationManager.IMPORTANCE_DEFAULT
);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(serviceChannel);
}
}
showNotification():
private void showNotification(){
Notification.Builder builder = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
builder = new Notification.Builder(getApplicationContext(),"ForegroundServiceChannel");
}
Intent play = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
play.setAction("PLAY");
PendingIntent pIntent = PendingIntent.getService(getApplicationContext(),100,play,0);
Intent pause = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
play.setAction("PAUSE");
PendingIntent paIntent = PendingIntent.getService(getApplicationContext(),pause,0);
Intent stop = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
play.setAction("STOP");
PendingIntent sIntent = PendingIntent.getService(getApplicationContext(),stop,0);
builder.setSmallIcon(R.mipmap.ic_launcher)
.setContentText("My Song is playing").setContentTitle("Meri Duniya")
.addAction(new Notification.Action(R.drawable.play,"Play",pIntent))
.addAction(new Notification.Action(R.drawable.pause,"Pause",paIntent))
.addAction(new Notification.Action(R.drawable.stop,"Stop",sIntent));
Notification notification = builder.build();
startForeground(9,notification);
}
我还在清单文件中授予了权限。
解决方法
你有这个:
Intent pause = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
play.setAction("PAUSE");
PendingIntent paIntent = PendingIntent.getService(getApplicationContext(),100,pause,0);
Intent stop = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
play.setAction("STOP");
您没有在 PAUSE 和 STOP 的正确变量上设置 ACTION
。你需要这个:
Intent pause = new Intent(getApplicationContext(),MusicPlayerBoundService.class);
pause.setAction("PAUSE");
PendingIntent paIntent = PendingIntent.getService(getApplicationContext(),MusicPlayerBoundService.class);
stop.setAction("STOP");
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