android - 如何在Android上管理startActivityForResult？(How to manage startActivityForResult on Android?)

Question

In my activity, I'm calling a second activity from the main activity by startActivityForResult .

(在我的活动中，我正在通过startActivityForResult从主活动中调用第二个活动。)

In my second activity there are some methods that finish this activity (maybe without result), however, just one of them return a result.

(在我的第二个活动中，有一些方法可以完成此活动（可能没有结果），但是只有其中一个返回结果。)

For example, from the main activity I call a second one.

(例如，从主要活动中，我叫第二个活动。)

In this activity I'm checking some features of handset such as does it have a camera.

(在本活动中，我将检查手机的某些功能，例如是否带有摄像头。)

If it doesn't have then I'll close this activity.

(如果没有，我将关闭此活动。)

Also, during preparation of MediaRecorder or MediaPlayer if a problem happens then I'll close this activity.

(另外，在准备MediaRecorder或MediaPlayer如果发生问题，那么我将关闭此活动。)

If its device has a camera and recording is done completely, then after recording a video if a user clicks on the done button then I'll send the result (address of the recorded video) back to main activity.

(如果其设备带有摄像头并且录制已完全完成，则在录制视频后，如果用户单击“完成”按钮，我会将结果（录制的视频的地址）发送回主要活动。)

How do I check the result from the main activity?

(如何检查主要活动的结果？)

  ask by Hesam translate from so

Answer 1

From your FirstActivity call the SecondActivity using startActivityForResult() method

(从你的FirstActivity致电SecondActivity使用startActivityForResult()方法)

For example:

(例如：)

Intent i = new Intent(this, SecondActivity.class);
startActivityForResult(i, 1);

In your SecondActivity set the data which you want to return back to FirstActivity .

(在您的SecondActivity设置要返回给FirstActivity 。)

If you don't want to return back, don't set any.

(如果您不想返回，请不要进行任何设置。)

For example: In SecondActivity if you want to send back data:

(例如：如果您要发送回数据，请在SecondActivity ：)

Intent returnIntent = new Intent();
returnIntent.putExtra("result",result);
setResult(Activity.RESULT_OK,returnIntent);
finish();

If you don't want to return data:

(如果您不想返回数据：)

Intent returnIntent = new Intent();
setResult(Activity.RESULT_CANCELED, returnIntent);
finish();

Now in your FirstActivity class write following code for the onActivityResult() method.

(现在，在FirstActivity类中，为onActivityResult()方法编写以下代码。)

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 1) {
        if(resultCode == Activity.RESULT_OK){
            String result=data.getStringExtra("result");
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            //Write your code if there's no result
        }
    }
}//onActivityResult