机器人 - 如何显示对话活动结束后 [英] android - How to show dialog after activity finishes

问题描述

假设我们有两个活动，活动1和活性2。

Say we have two activities, Activity1 and Activity2.

在活动1的onClick（）方法中，我们有一个呼叫如果某个按钮pressed开始活动2：

In Activity1's onClick() method, we have a call to start Activity 2 if a certain button is pressed:

Intent myIntent = new Intent(Activity1.this, Activity2.class);
Activity1.this.startActivity(myIntent);

完成（）被称为活性2后，与活动1恢复，我需要一个对话框，在活动1显示，只要它被恢复。

After finish() is called in Activity2, and Activity1 is resumed, I need a dialog to show in Activity1, as soon as it is resumed.

之前，我简单地称为的ShowDialog（ID）的活性1的onClick的同一块（）方法：

Before, I simply called showDialog(id) in the same block of Activity1's onClick() method:

public void onClick(View v) {
     if(v == addHole){
     //...
     Intent myIntent = new Intent(Activity1.this, Activity2.class);
     Activity1.this.startActivity(myIntent);
     showDialog(END_DIALOG_ID);
     }
}

问题是，活动1恢复后，对应END_DIALOG_ID对话框不可见，但屏幕变黑，反应迟钝（好像对话是present），直到返回键是pressed。

The issue is, after Activity1 resumes, the dialog corresponding to END_DIALOG_ID is not visible, but the screen is darkened and unresponsive (as if the dialog were present), until the back key is pressed.

我试图把在活动1的onResume（）和onRestart（）方法调用ShowDialog（）调用，但这些都引起程序崩溃。

I have tried putting the showDialog() call in Activity1's onResume() and onRestart() methods, but these both crash the program.

我也试图创造一种活性2的方法AsyncTask的，在它的onPostExecute（）ShowDialog的（）调用，但该对话框是不可见的活性2。

I have also tried creating an AsyncTask method in Activity2, with the showDialog() call in its onPostExecute(), but the dialog is not visible in Activity2.

private class ShowDialogTask extends AsyncTask<Void, Void, Integer> {
    /** The system calls this to perform work in a worker thread and
     * delivers it the parameters given to AsyncTask.execute() */
    protected Integer doInBackground(Void... id) {
        //do nothing
        return END_DIALOG_ID;
    }

    /** The system calls this to perform work in the UI thread and delivers
     * the result from doInBackground() */
    protected void onPostExecute(Integer id) {
        super.onPostExecute(id);
        showDialog(id);

    }
}

我现在试图通过调用来实现这个

I am now trying to implement this by calling

Activity1.this.startActivityForResult(myIntent, END_DIALOG_REQUEST);

与相应的setResult（）和的onActivityResult（）的活性1的方法，但似乎应该有实施这种一个更好的做法。所有我需要的是在活性2整理已显示出一个对话框。

with corresponding setResult() and onActivityResult() methods from Activity1, but it seems that there should be a better practice for implementing this. All I need is to have a dialog shown upon Activity2 finishing.

感谢您的帮助，您可以提供。

Thanks for any help you can provide.

推荐答案

就像你的建议，呼吁 startActivityForResult 启动时活性2 。然后，覆盖的onActivityResult 和检查 RESULT_OK ，并显示您的对话框即可。这就是做你希望做一个完全可以接受的做法。

Like you suggest, call startActivityForResult when starting Activity2. Then, override onActivityResult and check for RESULT_OK, and show your dialog box then. That's a perfectly acceptable practice for doing what you're looking to do.

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