How To Call A Toast Message On Success Callback In Class

I'm working on a POST API using okhttp library. Everything is working fine except I'm unable to find a way to show a simple toast message on it's success callback. How can I call a

Solution 1:

Every app has its own special thread that runs UI objects such as View objects; this thread is called the UI thread. Only objects running on the UI thread have access to other objects on that thread. Because tasks that you run on a thread from a thread pool aren't running on your UI thread, they don't have access to UI objects. To move data from a background thread to the UI thread, use a Handler that's running on the UI thread or can use android implementation for the same as shown here.

- Case 1

 MyActivity.this.runOnUiThread(new Runnable() {
            @Override
            voidrun() {
               Toast.makeText(MyActivity.this,
                    "message", Toast.LENGTH_LONG).show();
            });

- Case 2

new Handler(Looper.getMainLooper()).post(new Runnable() {
    @Override
    publicvoidrun() {
       Toast.makeText(MyActivity.this,
                    "message", Toast.LENGTH_LONG).show();
    }
});

Had it been Main thread you would have used it directly like

Toast.makeText(MyActivity.this,
                    "message", Toast.LENGTH_LONG).show();

Solution 2:

This callback is an asynchronous function, and you can change View just in UI-thread, so Handler will be helpd for you.

    ....
    privatefinalstaticintMSG_SUCCESS=0x0001;
    privatefinalstaticintMSG_FAIL=0x0002;
    privateHandlerhandler=newHandler(){
        @OverridepublicvoidhandleMessage(Message msg) {
            switch(msg.what){
              case MSG_SUCCESS:
                 //Toast successbreak;
              case MSG_FAIL:
                 //Toast failbreak;
              default:
                  break;
            }
        }
    };

    ......
    ......

    if (response.isSuccessful()) {
              Log.i("SUCCESSFUL", "onSuccess: data uploaded");
              handler.sendEmptyMessage(MSG_SUCCESS);
           } else {
             Log.i("UN SUCCESSFUL", "onFailure: Failed to upload data to server");
              handler.sendEmptyMessage(MSG_FAIL);
            }
     ......

Solution 3:

You are getting error

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Because you're calling it from a worker thread. You need to call Toast.makeText() (and most other functions dealing with the UI) from within the main thread. You could use a handler,

@OverridepublicvoidonResponse(Call call, Response response)throws IOException {
                if (response.isSuccessful()) {    
                    Log.i("SUCCESSFUL", "onSuccess: data uploaded");

                    context.runOnUiThread(newRunnable() {
                    publicvoidrun() {
                    Toast.makeText(context, "SUCCESSFUL", Toast.LENGTH_SHORT).show();
                     }
                  });
                }

Solution 4:

Just send the context of your activity while calling this method:

voidmethodName(Context c){

 post(URL, jsonData, newCallback() {
                @OverridepublicvoidonFailure(Call call, IOException e) {
                    Log.i("FAILED", "onFailure: Failed to upload data to server");
                    //here I want to show toast message
                }

                @OverridepublicvoidonResponse(Call call, Response response)throws IOException {
                    if (response.isSuccessful()) {

                        Log.i("SUCCESSFUL", "onSuccess: data uploaded");
                       Toast.makeText(c,"message",Toast.LENGTH_SHORT).show();
                        //here I want to show toast message

                    } else {
                        Log.i("UN SUCCESSFUL", "onFailure: Failed to upload data to server");
                        //here I want to show toast message
                    }
                }
});
}

Solution 5:

Try this

TaskActivity.this.runOnUiThread(newRunnable() {
        @Overridevoidrun() {
            Toastmsg= Toast.makeText(TaskActivity.this,
                "message", Toast.LENGTH_LONG);
            msg.show();
        });