进度对话框开放活动 [英] Progress Dialog on open activity

问题描述

嘿，伙计们， 我已经与进度对话框的问题上打开一个活动（称为例如，在活动2）。 活动2有很多code本OnCreate事件来执行。

hey guys, i've a problem with progress dialog on opening an activity (called activity 2 in example). The activity 2 has a lot of code to execute in this OnCreate event.

final ProgressDialog myProgressDialog = ProgressDialog.show(MyApp.this,getString(R.string.lstAppWait), getString(R.string.lstAppLoading), true);
new Thread() {
    public void run() {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                showApps();
            }
        });
        myProgressDialog.dismiss();
    }
}.start(); 

在showApps功能推出的活动2。

The showApps function launch activity 2.

如果我执行这个code。关于我的按钮点击事件上的活动1，我看到了进步，但她不动，并afeter我有在2〜3秒的黑屏时间为Android的展现活动。

if i execute this code on my button click event on activity 1, i see the progress, but she doesn't move and afeter i have a black screen during 2 or 3 seconds the time for android to show the activity.

如果我在活性2的OnCreate执行此code，如果我在code上的OnCreate，更换showApps活动1冻结2秒，我看不到进度对话框，并再次冻结2秒在活动2之前看到的结果。

If i execute this code in the OnCreate of Activity2 and if i replace the showApps by the code on OnCreate, Activity1 freeze 2 seconds, i don't see the progress dialog, and freeze again 2 seconds on activity 2 before seeing the result.

这是想法？

推荐答案

我有同样的问题，使用的 AsyncTask的是为我工作。

I had the same issue and using an AsyncTask is working for me.

有在AsyncTask的覆盖三个重要的方法。

There are 3 important methods to override in AsyncTask.

1. doInBackground ：这就是你的背景肉 会发生处理。
2. 在preExecute ：在这里展示您的ProgressDialog（的ShowDialog）
3. onPostExecute ：这里隐藏ProgressDialog（removeDialog或dismissDialog ）

1. doInBackground : this is where the meat of your background processing will occur.
2. onPreExecute : show your ProgressDialog here ( showDialog )
3. onPostExecute : hide your ProgressDialog here ( removeDialog or dismissDialog )

如果你让你的AsyncTask子类作为一个内部类的活动，那么你可以从你的AsyncActivity中调用框架方法的ShowDialog，dismissDialog和removeDialog。

If you make your AsyncTask subclass as an inner class of your activity, then you can call the framework methods showDialog, dismissDialog, and removeDialog from within your AsyncActivity.

下面是AsyncTask的样本实现：

Here's a sample implementation of AsyncTask:

class LoginProgressTask extends AsyncTask<String, Integer, Boolean> {
  @Override
  protected Boolean doInBackground(String... params) {
    try {
      Thread.sleep(4000);  // Do your real work here
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    return Boolean.TRUE;   // Return your real result here
  }
  @Override
  protected void onPreExecute() {
    showDialog(AUTHORIZING_DIALOG);
  }
  @Override
  protected void onPostExecute(Boolean result) {
    // result is the value returned from doInBackground
    removeDialog(AUTHORIZING_DIALOG);
    Intent i = new Intent(HelloAndroid.this, LandingActivity.class);
    startActivity(i);
  }
}

这篇关于进度对话框开放活动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！