java.lang.RuntimeException: Handler (android.os.Handler) sending message to a Handler on a dead thread

问题:

in my app I'm using IntentService for sending SMS.

    @Override protected void onHandleIntent(Intent intent) {     Bundle data = intent.getExtras();     String[] recipients = null;     String message = getString(R.string.unknown_event);     String name = getString(R.string.app_name);     if (data != null && data.containsKey(Constants.Services.RECIPIENTS)) {         recipients = data.getStringArray(Constants.Services.RECIPIENTS);         name = data.getString(Constants.Services.NAME);         message = data.getString(Constants.Services.MESSAGE);         for (int i = 0; i 

when running the app, I get the following error:

W/MessageQueue(7180): Handler (android.os.Handler) {42586468} sending message to a Handler on a dead thread W/MessageQueue(7180): java.lang.RuntimeException: Handler (android.os.Handler) {42586468} sending message to a Handler on a dead thread W/MessageQueue(7180):   at android.os.MessageQueue.enqueueMessage(MessageQueue.java:294) W/MessageQueue(7180):   at android.os.Handler.enqueueMessage(Handler.java:618) W/MessageQueue(7180):   at android.os.Handler.sendMessageAtTime(Handler.java:587) W/MessageQueue(7180):   at android.os.Handler.sendMessageDelayed(Handler.java:558) W/MessageQueue(7180):   at android.os.Handler.post(Handler.java:323) W/MessageQueue(7180):   at android.widget.Toast$TN.hide(Toast.java:367) W/MessageQueue(7180):   at android.app.ITransientNotification$Stub.onTransact(ITransientNotification.java:55) W/MessageQueue(7180):   at android.os.Binder.execTransact(Binder.java:351) W/MessageQueue(7180):   at dalvik.system.NativeStart.run(Native Method) 

My SMSReceiver is located in another class. How can i solve this problems? Thanks; Eyal.

回答1:

The problem here is that you are creating a Toast inside a thread that is managed by the IntentService. The system will use the Handler associated with this thread to show and hide the Toast.

First the Toast will be shown correctly, but when the system tries to hide it, after the onHandleIntent method has finished, the error "sending message to a Handler on a dead thread" will be thrown because the thread on which the Toast was created is no longer valid, and the Toast will not disappear.

To avoid this you should show the Toast posting a message to the Main Thread. Here's an example:

    // create a handler to post messages to the main thread     Handler mHandler = new Handler(getMainLooper());     mHandler.post(new Runnable() {         @Override         public void run() {             Toast.makeText(getApplicationContext(), "test", Toast.LENGTH_SHORT).show();         }     }); 

回答2:

Display Toast on IntentService. try this code..

@Override public void onCreate() {     super.onCreate();     mHandler = new Handler(); }  @Override protected void onHandleIntent(Intent intent) {     mHandler.post(new Runnable() {                     @Override         public void run() {             Toast.makeText(MyIntentService.this, "Test", Toast.LENGTH_LONG).show();                         }     }); } 

source :- https://stackoverflow.com/a/5420929/4565853

回答3:

I think you need to check a condition:

mHandler.getLooper().getThread().isAlive() 

The application will just warn you about this error. Of course it s mostly not fatal one. But if there are many spawned usages of this handler these warnings will slow down the application.

文章来源: java.lang.RuntimeException: Handler (android.os.Handler) sending message to a Handler on a dead thread