从较新的活动返回时如何触发旧活动上的函数？[副本]

Answer 1

您应该使用以下方法开始您的活动

static final int YOUR_REQUEST_CODE = 1;  // The request code
startActivityForResult(yourIntent, YOUR_REQUEST_CODE);

然后在旧活动中重写以下方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Check which request we're responding to
    if (requestCode == YOUR_REQUEST_CODE) {
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {

            // Do something with here.
        }
    }
}

更多详情可在Android Developer官方指南中找到