Question

我想在doInBackground中显示toast消息，如下所示。

private class myAsync extends AsyncTask<Void, Integer, Void>
{
    int duration = 0;
    int current = 0;
    int inc = 0;

    @Override
    protected Void doInBackground(Void... params) {

        videoView.start();
        videoView.setOnPreparedListener(new OnPreparedListener() {

            public void onPrepared(MediaPlayer mp) {

                duration = videoView.getDuration();

            }
        });

        do {
            current = videoView.getCurrentPosition();
            inc = inc + 1;

            if(inc == 10000 || inc == 25000 || inc == 30000){
                Toast.makeText(getApplicationContext(), inc, Toast.LENGTH_LONG).show();
            }
       } while (current <= duration);          

        return null;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);
        Toast toast = Toast.makeText(getApplicationContext(),values[0], Toast.LENGTH_LONG);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();
    }
}

我希望在10000,25000,30000时显示inc值。

我希望知道这个的人帮助我。

由于

Answer 1

假设MyAsync嵌套在一个Activity中：

private class myAsync extends AsyncTask<Void, Integer, Void>
{
    int duration = 0;
    int current = 0;
    int inc = 0;

    @Override
    protected Void doInBackground(Void... params) {

        videoView.start();
        videoView.setOnPreparedListener(new OnPreparedListener() {

            public void onPrepared(MediaPlayer mp) {

                duration = videoView.getDuration();

            }
        });

        do {
            current = videoView.getCurrentPosition();
            inc = inc + 1;

            if(inc == 10000 || inc == 25000 || inc == 30000){
                showToast(inc);
            }
       } while (current <= duration);          

        return null;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);
        showToast(values[0]);
        // Todo integrate gravity parameter
    }

    private void showToast(String text)
    {
        MainActivity.this.runOnUiThread(new Runnable()
        {
            public void run()
            {
                Toast.makeText(MainActivity.this, text, Toast.LENGTH_LONG).show();
            }
        });
    }
}

Answer 2

我把它解决了，因为我把publishProgress（inc）;在if语句中

if(inc == 10000 || inc == 25000 || inc == 30000){
   publishProgress(inc);
}

它有效。

如何在AsyncTask中显示Toast

2 个答案: