Question

我有一个奇怪的问题，我的媒体播放器工作，并且当媒体播放器代码在我的片段的onCreateView方法中时播放正常。

class HomeFragment1 extends Fragment implements OnClickListener{

@Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
                         Bundle savedInstanceState){
    final View view= inflater.inflate(R.layout.homefragment1, container, false);

    try {
        System.out.println("Should Play");
        MediaPlayer player = new MediaPlayer();
        player.setAudioStreamType(AudioManager.STREAM_MUSIC);
        player.setDataSource("http://10.0.2.2/users/" + user_id + "/tracks/track1.mp3");
        player.prepare();
        if (!player.isPlaying()) {
            player.start();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return view;
}

此代码有效，玩家可以正常使用。

但是，我尝试根据片段的可见性启动/停止音乐。因此，当我使用相同的代码块并将其移动到setUserVisibleHint方法时，它会中断。活动需要很长时间才能加载，音乐永远不会播放，尽管它会打印出应该播放。当我滑动到另一个片段时，它打印应该停止。

@Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);

        if (isVisibleToUser)
        {
            try {
                System.out.println("Should Play");
                MediaPlayer player = new MediaPlayer();
                player.setAudioStreamType(AudioManager.STREAM_MUSIC);
                player.setDataSource("http://10.0.2.2/users/" + user_id + "/tracks/track1.mp3");
                player.prepare();
                if (!player.isPlaying()) {
                    player.start();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        else
        {
            System.out.println("Should Stop");
            //Enter stop logic here

        }

    }

Here is my error: 
01-13 12:54:27.317    1458-1458/arufolo.trapster I/System.out﹕ Should Play
01-13 12:54:58.278    1458-1477/arufolo.trapster E/MediaPlayer﹕ error (1, -2147483648)
01-13 12:54:58.279    1458-1458/arufolo.trapster W/System.err﹕ java.io.IOException: Prepare failed.: status=0x1
01-13 12:54:58.283    1458-1458/arufolo.trapster W/System.err﹕ at android.media.MediaPlayer._prepare(Native Method)
01-13 12:54:58.284    1458-1458/arufolo.trapster W/System.err﹕ at android.media.MediaPlayer.prepare(MediaPlayer.java:1125)
01-13 12:54:58.284    1458-1458/arufolo.trapster W/System.err﹕ at arufolo.trapster.HomeFragment1.setUserVisibleHint(HomeActivity.java:221)
01-13 12:54:58.284    1458-1458/arufolo.trapster W/System.err﹕ at android.support.v4.app.FragmentPagerAdapter.setPrimaryItem(FragmentPagerAdapter.java:130)
01-13 12:54:58.284    1458-1458/arufolo.trapster W/System.err﹕ at android.support.v4.view.ViewPager.populate(ViewPager.java:1071)
01-13 12:54:58.295    1458-1458/arufolo.trapster W/System.err﹕ at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.view.View.measure(View.java:17430)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.view.View.measure(View.java:17430)
01-13 12:54:58.296    1458-1458/arufolo.trapster W/System.err﹕ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
01-13 12:54:58.297    1458-1458/arufolo.trapster W/System.err﹕ at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
01-13 12:54:58.297    1458-1458/arufolo.trapster W/System.err﹕ at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
01-13 12:54:58.297    1458-1458/arufolo.trapster W/System.err﹕ at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
01-13 12:54:58.297    1458-1458/arufolo.trapster W/System.err﹕ at android.view.View.measure(View.java:17430)
01-13 12:54:58.297    1458-1458/arufolo.trapster W/System.err﹕ at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)

关于这一点的最奇怪的事情......当您滑动到一个新片段时，然后向后滑动到音乐应该播放的片段，它可以正常播放而没有错误。

任何人都可以帮我吗？

Android：MediaPlayer在Fragment Visibility中无法发挥作用

0 个答案: