如何管理`startActivityForResult`在Android？ [英] How to manage `startActivityForResult` on Android?

问题描述

在我的活动，我打电话从主要活动由 startActivityForResult 第二次活动。在我的第二个活动有一些完成本次活动（也许没有结果）一些方法，但只是其中之一返回结果。

In my activity, I'm calling a second activity from the main activity by startActivityForResult. In my second activity there are some methods that finish this activity (maybe without result), however, just one of them return a result.

例如，从主要活动我所说的第二个。在此活动中，我检查手机的某些功能，比如它有一个摄像头。如果没有那我就关闭这个活动。此外，在MediaRecorder或MediaPlayer的的preparation如果问题发生然后我会关闭这个活动。

For example, from the main activity I call a second one. In this activity I'm checking some features of handset such as does it have a camera. If it doesn't have then I'll close this activity. Also, during preparation of MediaRecorder or MediaPlayer if a problem happens then I'll close this activity.

如果其设备有一个摄像头和录音是完全做得到，那么如果用户点击完成按钮然后我将结果发送（录制的视频地址）回主要活动录制视频后。

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.

我如何检查结果从主要活动？

How do I check the result from the main activity?

推荐答案

从你的 FirstActivity 的 SecondActivity 使用来电 startActivityForResult（）方法

例如：

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

在你的 SecondActivity 设置要返回到 FirstActivity 中的数据。如果你不想返回，没有设置任何。

In your SecondActivity set the data which you want to return back to FirstActivity. If you don't want to return back, don't set any.

例如：在secondActivity如果要发回的数据：

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

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

如果您不希望返回的数据：

If you don't want to return data:

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

现在在你的FirstActivity类写入以下code为 onActivityResult（）方法。

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

@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

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