Question

我正在构建一个应用程序，我正在使用FCM通知。当用户点击通知时，我想将他发送到主要活动上的Fragment1（即片段的名称）。我使用intent.putExtra执行此操作但在主活动时我记录了Bundle extras = getIntent（）。getExtras（）我有空指针异常。为什么我在putExtra中没有任何东西？

这是myFireBaseMessagingService

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.d("OnMessage", "Received");
    super.onMessageReceived(remoteMessage);
    Log.d(TAG, "From " + remoteMessage.getFrom());
    Log.d(TAG, "Body " + remoteMessage.getNotification().getBody());
    sendNotification(remoteMessage);

}




private void sendNotification(RemoteMessage remoteMessage) {
    Intent intent=new Intent(this, MainActivity.class);
    intent.putExtra("action", "goToFragment1");
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent=PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
    Uri defaultSoundUri=RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder=new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.logo)
            .setContentText(remoteMessage.getNotification().getBody())
            .setContentTitle("Asp")
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent);
    NotificationManager notificationManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(0, notificationBuilder.build());


}

这是MainActivity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn1=(Button)findViewById(R.id.dugme1);
    btn2=(Button)findViewById(R.id.dugme2);
    btn3=(Button)findViewById(R.id.dugme3);
    dugme=(Button)findViewById(R.id.subscribe);
    dugme.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            FirebaseMessaging.getInstance().subscribeToTopic("developeri");
            Log.d("Bravo", "Subscribed to developeri!");
        }
    });


    FragmentManager fm=getSupportFragmentManager();
    FragmentTransaction ft=fm.beginTransaction();
    StartFragment startFragment=new StartFragment();
    ft.add(R.id.myFragment, startFragment);
    ft.commit();
    btn1.setOnClickListener(btnOnClickListener);
    btn2.setOnClickListener(btnOnClickListener);
    btn3.setOnClickListener(btnOnClickListener);
    Intent intent=getIntent();
    Bundle extras=getIntent().getExtras();
    Log.d("Bundle", "Bundle is here");
    Log.d("Extras", extras.getString("action"));
    if (extras!=null && extras.containsKey("action") && extras.getString("action").contains("goToFragment1")){
        getSupportFragmentManager().beginTransaction().replace(R.id.myFragment, new Fragment1()).commit();
        Log.d("MainActivity", "IF IS HERE");

    }

}
 Button.OnClickListener  btnOnClickListener= new Button.OnClickListener() {
     @Override
     public void onClick(View view) {
         Fragment newFragment;
         if (view==btn1){
             newFragment =new Fragment1();

         }else if(view==btn2){
              newFragment =new Fragment2();
         }else if (view==btn3){
             newFragment =new Fragment3();
         }else{
             newFragment=new StartFragment();
         }
         FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();
         transaction.replace(R.id.myFragment, newFragment);
         transaction.addToBackStack(null);
         transaction.setTransition(FragmentTransaction.TRANSIT_NONE);
         transaction.commit();


     }
 };

}

我的logcat

06-07 09：22：49.598 23913-23913 / com.example.dev3.fragmenti E / AndroidRuntime：致命异常：主要 java.lang.RuntimeException：无法启动活动 ComponentInfo {com.example.dev3.fragmenti / com.example.dev3.fragmenti.MainActivity}：显示java.lang.NullPointerException 在 android.app.ActivityThread.performLaunchActivity（ActivityThread.java）在 android.app.ActivityThread.handleLaunchActivity（ActivityThread.java）在android.app.ActivityThread.access $ 700（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java）在android.os.Handler.dispatchMessage（Handler.java）在android.os.Looper.loop（Looper.java）在android.app.ActivityThread.main（ActivityThread.java） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:525）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java） at dalvik.system.NativeStart.main（Native Method）引起：java.lang.NullPointerException 在 com.example.dev3.fragmenti.MainActivity.onCreate（MainActivity.java:53）在android.app.Activity.performCreate（Activity.java）在 android.app.Instrumentation.callActivityOnCreate（Instrumentation.java）在 android.app.ActivityThread.performLaunchActivity（ActivityThread.java）在 android.app.ActivityThread.handleLaunchActivity（ActivityThread.java）在android.app.ActivityThread.access $ 700（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java）在android.os.Handler.dispatchMessage（Handler.java）在android.os.Looper.loop（Looper.java）在android.app.ActivityThread.main（ActivityThread.java） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:525）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java）在dalvik.system.NativeStart.main（本地方法）

Answer 1

仅在启动活动时调用“创建”。主要依然存在＆＃34;活着＆＃34;在收到您的通知时。因此，您应该让代码处理额外的：

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        if (intent.hasExtra("action")) {
            String action =  intent.getExtras().getString("action");
            // Do what ever is needed
            if (action.equalsIgnoreCase("gotToFragment1")) { 
                getSupportFragmentManager().beginTransaction().replace(R.id.myFragment, new Fragment1()).commit();
            }
        }
    }

将onNewIntent()方法添加到MainActivity（接收新Intent的活动）。如果您的活动已经开始，则会调用此方法。

Answer 2

尝试移动你的

    intent.putExtra("action", "goToFragment1");

上面

PendingIntent pendingIntent=PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);

为什么我的Bundle附加功能不存在？

2 个答案: