在 Asynctask 中使用 Thread.sleep 时出错

Question

我正在尝试在我的 Asynctask 中添加一些睡眠时间，因为现在我的 ProgressDialog 在没有太多数据要加载的情况下太快了。

我试过了：

@Override
protected Boolean doInBackground(Void... params) {
    try {
        progressDialog.setMessage("Loading first thing...");
        firstThing();
        progressDialog.incrementProgressBy(1);
        Thread.sleep(500);
        //...repeat above four lines a few times for second, third, fourth thing, etc
        return true;
    }
    catch (Exception e) {
        Log.e("MyClassName", "There was an error: " + e);
        return false;
    }
}

我收到错误“只有创建视图的原始线程才能接触其视图。”

Answer 1

您必须覆盖 onProgressUpdate() 和 doInBackground()。

            // do this before asynctask.execute();
            progressDialog.setMessage("Loading first thing...");


@Override
protected Boolean doInBackground(Void... params) {
    try {
        firstThing();
        Thread.sleep(500);
        // this method invokes onProgressUpdate on the UI thread
        publishProgress();
        return true;
    }
    catch (Exception e) {
        Log.e("MyClassName", "There was an error: " + e);
        return false;
    }
}

@Override
protected void onProgressUpdate(Void... params) {
    progressDialog.incrementProgressBy(1);
}