使用onResume（）刷新活动 [英] Using onResume() to refresh activity

问题描述

我不能为我的生活弄清楚如何有一个活动pressing后退按钮后刷新。我现在有一个触发的意图，转到B活性A和行为，同时B上的，如果你preSS后，我想回去作为的，但有它自动刷新。我可以用这个意图刷新当前的活动：

I can't for the life of me figure out how to have an activity be refreshed after pressing the back button. I currently have activity A that fires an intent to goto B and while on act B if you press back I want to go back to act A but have it refresh itself. I can use this intent to refresh the activity currently:

Intent refresh = new Intent(this, Favorites.class);
    startActivity(refresh);
    this.finish();

但我不知道如何正确使用onResume（）函数将返回后刷新我扮演一个。

But I can't figure out how to properly use the onResume() function to refresh my act A after going back to it.

推荐答案

如果你需要一个特别的行为 ActivityA 从 ActivityB <回来时， / code>，你应该使用 startActivityForResult（意向意图，诠释请求code）而不是 startActivity（意向意图）：

If you need a special behaviour of ActivityA when coming back from ActivityB, you should use startActivityForResult(Intent intent, int requestCode) instead of startActivity(Intent intent):

 startActivityForResult(new Intent(this, ActivityB.class), REQUEST_CODE); 

这样一来，您就可以检测到 ActivityB 的终止 ActivityA 超载 onActivityResult（INT申请code，INT结果code，意图意图）：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);

    if (requestCode == REQUEST_CODE) {
        doRefresh(); // your "refresh" code
    }
}

这个工程，即使你终止 ActivityB 按后退按钮的preSS。该结果code 将 RESULT_CANCELLED 默认情况下，在这种情况下。

This works even if you terminate ActivityB by the press of the back button. The resultCode will be RESULT_CANCELLED by default in that case.

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