Question

我有一个父活动A，它有两个子活动B和C.当我打开父活动A时，它决定必须打开哪个子活动。（使用startActivityForResult的功能）例如。决定打开B. B播放视频并返回结果。如果A决定再次打开B，那就好了。 B打不开（不播放视频）。

注意： 以下是好的：

A - > B和A＆lt; -B

然后

A - > C和A < - C

然后

A - > B和A＆lt; -B

但是以下不起作用：

A - > B和A＆lt; -B

然后

A - ＆gt; B和A＆lt; - B //当尝试再次移动B.我认为A在完成之前再次呼叫B

然后

A - > C和A < - C

任何解决这个问题的想法??

意味着我怎样才能在再次召唤孩子之前完成孩子的活动？

以下是父活动的代码：

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.d(Constants.TAG,"requestCode: "+requestCode+" : resultCode : "+ resultCode);
        finishActivity(requestCode);
        playProgram(requestCode);
    }

    private void playProgram(int requestCode){
        if(requestCode == QUESTION_WRAPPER){
            currentChap = currentChap + 1;
            Intent intent = new Intent(MovieWrapperActivity.this, VideoWrapperActivity.class);
            intent.putExtra("chaptertoplay", currentChap);
            intent.putExtra("videofile",  Constants.mCourse.getmChapters().get(currentChap).getVideoURL());
            startActivityForResult(intent, MOVIE_WRAPPER);
        }else if(requestCode == MOVIE_WRAPPER) {
            if(Constants.mCourse.getmChapters().get(currentChap).isQuiz()){
                Intent in2 = new Intent(MovieWrapperActivity.this, QuestionWrapper.class);
                in2.putExtra("chaptertoplay", currentChap);
                startActivityForResult(in2, QUESTION_WRAPPER);

            }else{
                currentChap = currentChap + 1;
                Intent intent = new Intent(MovieWrapperActivity.this, VideoWrapperActivity.class);
                intent.putExtra("chaptertoplay", currentChap);
                intent.putExtra("videofile",  Constants.mCourse.getmChapters().get(currentChap).getVideoURL());
                startActivityForResult(intent, MOVIE_WRAPPER);
            }
        }
    }

B代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (!io.vov.vitamio.LibsChecker.checkVitamioLibs(this))
        return;
    setContentView(R.layout.videoview);
    init();
    mVideoView = (VideoView) findViewById(R.id.surface_view);
    mVideoView.setVideoPath(videoPath);
    mVideoView.setVideoQuality(MediaPlayer.VIDEOQUALITY_HIGH);
    mController = new MediaController(this);
    mVideoView.setMediaController(mController);
    mVideoView.setOnCompletionListener(new OnCompletionListener() {

        @Override
        public void onCompletion(MediaPlayer arg0) {
            Log.d(Constants.TAG,"Completed");
            Intent returnIntent = new Intent();
            setResult(RESULT_OK, returnIntent);
            mVideoView = null;
            mController = null;
            finish();
        }
    });
}

我认为B中的媒体元素需要时间来摧毁甚至不被摧毁。

Answer 1

Intent output = new Intent();
    output.putExtra("DATA", data);
    setResult(Activity.RESULT_OK  , output);
    finish();

设置结果后，只需致电finish()即可。

Answer 2

你必须在子活动中的setresult（）之后调用finish（）。

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.d(Constants.TAG,"requestCode: "+requestCode+" : resultCode : "+ resultCode);
        finishActivity(requestCode);//dont finish child activity here.
        playProgram(requestCode);
    }

如何在再次启动该子项之前确认子活动已完成？

2 个答案: