Question

我的活动启动了一个AsyncTask，它在后台向服务器发送一些关于传感器移动的日期（这是一个循环）。因此，每个动作都被分类并对特定动作进行约束。出于这个原因，我需要显示一个图像来解释这个动作。

例如：行动：倒 - ＆gt;玻璃的图像

问题是我需要用这个图像显示一个文本，所以我想到了Dialog。当我实现它时，我有这个错误：

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.example.sara.myapplication, PID: 32472
              android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
                  at android.view.ViewRootImpl.setView(ViewRootImpl.java:574)
                  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:272)
                  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
                  at android.app.Dialog.show(Dialog.java:298)
                  at com.example.stefano.myapplication.Sensor.showImage(MetaWearAsyncTask.java:234)
                  at com.example.stefano.myapplication.Sensor.onProgressUpdate(MetaWearAsyncTask.java:216)
                  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:648)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:135)
                  at android.app.ActivityThread.main(ActivityThread.java:5753)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at java.lang.reflect.Method.invoke(Method.java:372)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
I/Process: Sending signal. PID: 32472 SIG: 9
Application terminated.

有人可以就如何实施Dialog给我一个建议吗？或者那是另一种方式吗？

由于

的AsyncTask：

protected void onProgressUpdate(Object[] values) {
    Movement movement = (Movement) values[0];

    if((movement.getAction().toString()).equals("Pour")){
        showImage(R.drawable.pour);
    }
    else if((movement.getAction().toString()).equals("OpenDoor")){
        showImage(R.drawable.open_door);
    }
    else if((movement.getAction().toString()).equals("Cut")){
        showImage(R.drawable.knife);
    }
    else {
        Toast.makeText(context, device +  ": " +"Recognized: " + movement.getAction(), Toast.LENGTH_SHORT).show();
    }
}

private void showImage(int idImage) {

    dialog.setIcon(idImage);
    dialog.setTitle(device);
    dialog.show();

    //stop dialog after 1.5 seconds
    Runnable progressRunnable = new Runnable() {

        @Override
        public void run() {
            dialog.dismiss();
        }
    };

    Handler pdCanceller = new Handler();
    pdCanceller.postDelayed(progressRunnable, 1500);
}

onProgressUpdate上AsyncTask中的对话框

0 个答案: