如何在视图寻呼机中停止媒体播放器声音？

Question

我是 Android 开发新手，我的活动中有滑块片段。我正在尝试为不同的滑块播放不同的声音。但是，当我从一页滑到另一页时，声音是重叠的。任何人都可以帮助我们吗？这是我的代码：

public class Diabetes1 extends Fragment {
       MediaPlayer mp;
       View rootView;

       @Override
       public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                         Bundle savedInstanceState) {
            rootView = inflater.inflate(R.layout.slidertopimagecardlayout, container, false);
            SharedPreferences prefs = this.getActivity().getSharedPreferences("MY_LANGUAGE", MODE_PRIVATE);
            if (prefs.getString("myLanguage", "").equals("en")) {
                mp = MediaPlayer.create(getActivity().getBaseContext(), getResources().getIdentifier("diab1en", "raw", this.getActivity().getPackageName()));
                mp.start();
            } else if (prefs.getString("myLanguage", "").equals("es")) {
                mp = MediaPlayer.create(getActivity().getBaseContext(), getResources().getIdentifier("diab1en", "raw", this.getActivity().getPackageName()));
                mp.start();
            }
            return rootView;
       }

       @Override
       public void setUserVisibleHint(boolean isVisibleToUser) {
            super.setUserVisibleHint(isVisibleToUser);
            // Make sure that we are currently visible
            if (this.isVisible()) {
                // If we are becoming invisible, then...
                if (!isVisibleToUser) {
                    mp.stop();
                } else {
                    // do what you like
                }
            }
       }

       @Override
       public void onPause() {
            super.onPause();
            if(mp.isPlaying()) {
                  mp.stop();
            }
       }

       @Override
       public void onResume() {
            super.onResume();
       }
}

Answer 1

Viewpager 不适合您的目的，因为它会为页面之间的快速转换创建屏幕外片段。对于您的问题，每个都调用了 onCreateView，但没有调用 onPause。要处理此问题，您可以将 pageChangeListener 与 pagerAdapter 一起使用。每次页面更改后，您可以切换到另一种声音并停止当前声音。为此，您必须从页面片段中提取媒体播放器逻辑。

Answer 2

试试这段代码，看看它是否有效

public class Diabetes1 extends Fragment {
       MediaPlayer mp;
       View rootView;
       Boolean isPLaying = false;

       @Override
       public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                         Bundle savedInstanceState) {
            rootView = inflater.inflate(R.layout.slidertopimagecardlayout, container, false);
            SharedPreferences prefs = this.getActivity().getSharedPreferences("MY_LANGUAGE", MODE_PRIVATE);
            if (prefs.getString("myLanguage", "").equals("en")) {
                mp = MediaPlayer.create(getActivity().getBaseContext(), getResources().getIdentifier("diab1en", "raw", this.getActivity().getPackageName()));
                mp.start();
                isPLaying = true;
            } else if (prefs.getString("myLanguage", "").equals("es")) {
                mp = MediaPlayer.create(getActivity().getBaseContext(), getResources().getIdentifier("diab1en", "raw", this.getActivity().getPackageName()));
                mp.start();
                isPLaying = true;
            }
            return rootView;
       }

       @Override
       public void setUserVisibleHint(boolean isVisibleToUser) {
            super.setUserVisibleHint(isVisibleToUser);
            // Make sure that we are currently visible
            if (this.isVisible()) {
                // If we are becoming invisible, then...
                if (!isVisibleToUser) {
                    mp.stop();
                } else {
                    // do what you like
                }
            }
       }

       @Override
       public void onPause() {
            super.onPause();
            if(isPlaying) {
                  mp.stop();
                  isPLaying = false;
            }
       }

       @Override
       public void onResume() {
            super.onResume();
       }
}