如何为多个片段使用一个 MediaPlayer 实例
How to use one instance of MediaPlayer for several fragments
我正在创建音板应用程序。该应用程序将具有不同的 "pages"(viewpager 中的片段),用户可以在它们之间切换。每个片段都有许多 ImageButtons,当点击它们时,会播放特定的声音。
在我的每个片段 类 中,我将以下代码放入其 OnCreateView 方法中,如下例所示。
public static class FragmentPage1 extends Fragment {
int selectedSoundId;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_page1, container, false);
final MediaPlayer player = new MediaPlayer();
final Resources res = getResources();
final int[] buttonIds = { R.id.btn1, R.id.btn2, R.id.btn3, R.id.btn4, R.id.btn5, R.id.btn6, R.id.btn7, R.id.btn8, R.id.btn9 };
final int[] soundIds = { R.raw.sound1, R.raw.sound2, R.raw.sound3, R.raw.sound4, R.raw.sound5, R.raw.sound6, R.raw.sound7, R.raw.sound8, R.raw.sound9 };
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
for (int i = 0; i < buttonIds.length; i++) {
if (v.getId() == buttonIds[i]) {
selectedSoundId = soundIds[i];
AssetFileDescriptor afd = res.openRawResourceFd(soundIds[i]);
player.reset();
try {
player.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
player.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
player.start();
break;
}
}
}
};
for (int i = 0; i < buttonIds.length; i++) {
ImageButton soundButton = (ImageButton) rootView.findViewById(buttonIds[i]);
registerForContextMenu(soundButton);
soundButton.setOnClickListener(listener);
}
return rootView;
}
}
我有十二个不同的片段,每个片段上有一组九个按钮。如您所见,我有 12 个 MediaPlayer 代码实例(每个片段一个)。我一直在努力寻找一种方法来简化它,但到目前为止我什么也没想到。
如何编辑我的代码,以便我只需要使用此 MediaPlayer 代码的一个实例?
你可以使用单例模式,像这样:
public class MediaPlayerSingleton extends MediaPlayer{
private static MediaPlayerSingleton mediaPlayerSingleton;
private MediaPlayerSingleton() {}
public static MediaPlayerSingleton getInstance() {
synchronized (mediaPlayerSingleton) { // if you'll be using it in moe then one thread
if(mediaPlayerSingleton == null)
mediaPlayerSingleton = new MediaPlayerSingleton();
}
return mediaPlayerSingleton;
}
}
然后像这样在任何地方使用您的播放器:
MediaPlayerSingleton mediaPlayer = MediaPlayerSingleton.getInstance();
mediaPlayer.reset(); // some call
我正在创建音板应用程序。该应用程序将具有不同的 "pages"(viewpager 中的片段),用户可以在它们之间切换。每个片段都有许多 ImageButtons,当点击它们时,会播放特定的声音。
在我的每个片段 类 中,我将以下代码放入其 OnCreateView 方法中,如下例所示。
public static class FragmentPage1 extends Fragment {
int selectedSoundId;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_page1, container, false);
final MediaPlayer player = new MediaPlayer();
final Resources res = getResources();
final int[] buttonIds = { R.id.btn1, R.id.btn2, R.id.btn3, R.id.btn4, R.id.btn5, R.id.btn6, R.id.btn7, R.id.btn8, R.id.btn9 };
final int[] soundIds = { R.raw.sound1, R.raw.sound2, R.raw.sound3, R.raw.sound4, R.raw.sound5, R.raw.sound6, R.raw.sound7, R.raw.sound8, R.raw.sound9 };
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
for (int i = 0; i < buttonIds.length; i++) {
if (v.getId() == buttonIds[i]) {
selectedSoundId = soundIds[i];
AssetFileDescriptor afd = res.openRawResourceFd(soundIds[i]);
player.reset();
try {
player.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
player.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
player.start();
break;
}
}
}
};
for (int i = 0; i < buttonIds.length; i++) {
ImageButton soundButton = (ImageButton) rootView.findViewById(buttonIds[i]);
registerForContextMenu(soundButton);
soundButton.setOnClickListener(listener);
}
return rootView;
}
}
我有十二个不同的片段,每个片段上有一组九个按钮。如您所见,我有 12 个 MediaPlayer 代码实例(每个片段一个)。我一直在努力寻找一种方法来简化它,但到目前为止我什么也没想到。
如何编辑我的代码,以便我只需要使用此 MediaPlayer 代码的一个实例?
你可以使用单例模式,像这样:
public class MediaPlayerSingleton extends MediaPlayer{
private static MediaPlayerSingleton mediaPlayerSingleton;
private MediaPlayerSingleton() {}
public static MediaPlayerSingleton getInstance() {
synchronized (mediaPlayerSingleton) { // if you'll be using it in moe then one thread
if(mediaPlayerSingleton == null)
mediaPlayerSingleton = new MediaPlayerSingleton();
}
return mediaPlayerSingleton;
}
}
然后像这样在任何地方使用您的播放器:
MediaPlayerSingleton mediaPlayer = MediaPlayerSingleton.getInstance();
mediaPlayer.reset(); // some call