当新歌曲与服务一起播放时，如何停止旧歌曲

Question

我正在尝试创建一个音乐应用程序。我使用此代码在播放另一首歌曲时停止歌曲，但此代码不起作用.两首歌一起播放我想一首一首地播放，或者如果有其他歌曲会点击停止上一首歌曲并播放那首歌。任何人都可以帮助我。

主要活动：

private void clickSong() {
mListBaiHat.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {    
String local = mPath.get(i);
mserviceMusic.setLocalSongRunging(i);   
try {
mserviceMusic.setLocalSong(local);
mClickStart.setBackgroundResource(R.drawable.ic_media_pause_light);    
} catch (IOException e) {
e.printStackTrace();
}    
mHinhAlbum.setImageResource(arrayList.get(i).getHinhAlbum());
mCLickTenBaiHat.setText(arrayList.get(i).getTenBaiHat());
mCLickCasy.setText(arrayList.get(i).getTheloai());    
MediaMetadataRetriever retriever = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
retriever = new MediaMetadataRetriever();
retriever.setDataSource(mPath.get(i));
String tenAlbum = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);
String ten = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE);
mCLickTenBaiHat.setText(ten);
mCLickCasy.setText(tenAlbum);
}
bundle = new Bundle();
bundle.putInt("vitri", i);
bundle.putStringArrayList("tenbai", mPath);

}
});
}

服务：

public void setLocalSongRunging(int vitri){
mLocaltionSong = vitri;
}
public void setLocalSong(String localsong) throws IOException {
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(localsong);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();            
mediaPlayer.release();
mediaPlayer=null;
}else {
mediaPlayer.prepare();
mediaPlayer.start();
}
}

Answer 1

您每次都会创建一个新MediaPlayer。因此，您停止和释放的代码将不起作用(因为正在使用不同的媒体播放器实例(在setLocalSong(String localsong)中像这样更改您的代码。

public void setLocalSong(String localsong) throws IOException {
if(mediaPlayer != null){
mediaPlayer.stop();            
mediaPlayer.release();
mediaPlayer=null;
}
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(localsong);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.prepare();
mediaPlayer.start();
}