如何显示对话框以确认用户希望退出 Android Activity? [英] How to show a dialog to confirm that the user wishes to exit an Android Activity?

问题描述

我一直在尝试显示您想退出吗?"用户尝试退出活动时的对话框类型.

I've been trying to show a "Do you want to exit?" type of dialog when the user attempts to exit an Activity.

但是我找不到合适的 API 钩子.Activity.onUserLeaveHint() 最初看起来很有希望，但我找不到阻止 Activity 完成的方法.

However I can't find the appropriate API hooks. Activity.onUserLeaveHint() initially looked promising, but I can't find a way to stop the Activity from finishing.

推荐答案

在 Android 2.0+ 中，这看起来像:

In Android 2.0+ this would look like:

@Override
public void onBackPressed() {
    new AlertDialog.Builder(this)
        .setIcon(android.R.drawable.ic_dialog_alert)
        .setTitle("Closing Activity")
        .setMessage("Are you sure you want to close this activity?")
        .setPositiveButton("Yes", new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            finish();    
        }

    })
    .setNegativeButton("No", null)
    .show();
}

在早期版本中，它看起来像:

In earlier versions it would look like:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    //Handle the back button
    if(keyCode == KeyEvent.KEYCODE_BACK) {
        //Ask the user if they want to quit
        new AlertDialog.Builder(this)
        .setIcon(android.R.drawable.ic_dialog_alert)
        .setTitle(R.string.quit)
        .setMessage(R.string.really_quit)
        .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

                //Stop the activity
                YourClass.this.finish();    
            }

        })
        .setNegativeButton(R.string.no, null)
        .show();

        return true;
    }
    else {
        return super.onKeyDown(keyCode, event);
    }

}

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