我有listview,其中包含带播放按钮和搜索栏的音频文件列表.我使用基本适配器显示了列表视图.

当我单击列表视图的播放按钮时,我想播放音频文件.我成功地实现了这个,但是当我点击列表中的另一个播放按钮时,两个音频文件正在连续播放,它将继续播放所有播放按钮.如何限制媒体播放器在一个位置播放,如果我点击另一个图标,则必须停止旧媒体播放器并开始播放新媒体播放器.谁能说我怎么实现这个呢？

嗨,我正在使用此代码

public class PlayerList extends Activity {

private static final String TAG = "log";

ListView listV;

ArrayList> arrList = new ArrayList>();;

String[] strArray = { "/mnt/sdcard/Nal.mp3", "/mnt/sdcard/Nal2.mp3",

"/mnt/sdcard/Nal3.mp3", "/mnt/sdcard/sample1.mp3", };

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.homepage);

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()

.permitAll().build();

StrictMode.setThreadPolicy(policy);

listV = (ListView) findViewById(R.id.HomePagelistView1);

for (int i = 0; i < strArray.length; i ) {

HashMap hmap = new HashMap();

hmap.put("title", "File Name");

hmap.put("description", "File description");

hmap.put("url", strArray[i]);

arrList.add(hmap);

}

FileListAdapter sAdapter = new FileListAdapter(arrList, PlayerList.this);

listV.setAdapter(sAdapter);

}

}

FileListAdapter文件如下所示

public class FileListAdapter extends BaseAdapter implements

OnCompletionListener, OnSeekBarChangeListener {

private MediaPlayer mp;

private Handler mHandler = new Handler();;

private Utilities utils;

SeekBar seekBar;// = (SeekBar) findViewById(R.id.homeList_seekBar1);

String songPath = "";

// ImageView imageVPlay;

private ArrayList> data;

private LayoutInflater inflater = null;

public FileListAdapter(ArrayList> data,

Context context) {

this.data = data;

inflater = (LayoutInflater) context

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

public int getCount() {

return data.size();

}

public Object getItem(int position) {

return position;

}

public long getItemId(int position) {

return position;

}

public View getView(final int position, View convertView,

ViewGroup parent) {

View vi = convertView;

if (convertView == null)

vi = inflater.inflate(R.layout.homelist, parent, false);

final ImageView imageVDownload = (ImageView) vi

.findViewById(R.id.homeListimageDownload); // download

final ImageView imageVPlay = (ImageView) vi

.findViewById(R.id.homeListimagePlay); // play

final TextView textVTitle = (TextView) vi

.findViewById(R.id.homeListTextTitle); // email ID

final TextView textVDescription = (TextView) vi

.findViewById(R.id.homeListTextDesc); // email ID

seekBar = (SeekBar) vi.findViewById(R.id.homeList_seekBar1);

textVTitle.setText(data.get(position).get("title"));

textVDescription.setText(data.get(position).get("description"));

// /// set image tick and download

String loadFilePath = data.get(position).get("url");

// String loadFileName = data.get(position).get("title");

File ffPath = new File(loadFilePath);

String loadfileNameWithExt = ffPath.getName();

Log.i(TAG, "load file and name path " " " loadfileNameWithExt

" " loadFilePath);

imageVPlay.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

String selectFilePath = data.get(position).get("url");

String selectFileName = data.get(position).get("title");

Log.i(TAG, "selected file and name path " selectFileName

" " selectFilePath);

songPath = selectFilePath;

mediaplayerMethod(selectFilePath);

imageVPlay.setImageResource(R.drawable.list_pause);

textVTitle.setVisibility(View.INVISIBLE);

textVDescription.setVisibility(View.INVISIBLE);

seekBar.setVisibility(View.VISIBLE);

}

});

return vi;

}

protected void mediaplayerMethod(String filepath) {

Log.d(TAG, "mediaplayerMethod audio file path " filepath);

mp = new MediaPlayer();

mp.setOnCompletionListener(FileListAdapter.this); // Important

seekBar.setOnSeekBarChangeListener(FileListAdapter.this);

utils = new Utilities();

playSong(filepath);

}

private void playSong(final String fileptath) {

final Handler handler = new Handler() {

@Override

public void handleMessage(Message message) {

String xmlString = (String) message.obj;

Log.d(TAG, "handleMessage ");

try {

// mp.prepare();

mp.start();

seekBar.setProgress(0);

seekBar.setMax(100);

updateProgressBar();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (IllegalStateException e) {

e.printStackTrace();

}

}

};

Thread thread = new Thread() {

@Override

public void run() {

Log.d(TAG, "run ");

try {

mp.reset();

mp.setDataSource(fileptath);

Log.i(TAG, "internal file");

mp.prepare();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (IllegalStateException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

Message message = handler.obtainMessage(1, "");

handler.sendMessage(message);

}

};

thread.start();

}

public void updateProgressBar() {

mHandler.postDelayed(mUpdateTimeTask, 100);

}

private Runnable mUpdateTimeTask = new Runnable() {

public void run() {

try {

long totalDuration = mp.getDuration();

long currentDuration = mp.getCurrentPosition();

int progress = (int) (utils.getProgressPercentage(

currentDuration, totalDuration));

seekBar.setProgress(progress);

try {

double progVal = (progress / 100.0) * (360.0);

int progInt = (int) Math.ceil(progVal);

} catch (NumberFormatException e) {

Log.e(TAG, "NumberFormatException " e);

}

// Running this thread after 100 milliseconds

mHandler.postDelayed(this, 100);

} catch (IllegalStateException e) {

Log.e(TAG, "IllegalStateException " e);

}

}

};

@Override

public void onCompletion(MediaPlayer mp) {

mp.stop();

mp.release();

}

@Override

public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {

// TODO Auto-generated method stub

}

@Override

public void onStartTrackingTouch(SeekBar arg0) {

// TODO Auto-generated method stub

mHandler.removeCallbacks(mUpdateTimeTask);

}

@Override

public void onStopTrackingTouch(SeekBar arg0) {

// TODO Auto-generated method stub

mHandler.removeCallbacks(mUpdateTimeTask);

int totalDuration = mp.getDuration();

int currentPosition = utils.progressToTimer(seekBar.getProgress(),

totalDuration);

// forward or backward to certain seconds

mp.seekTo(currentPosition);

updateProgressBar();

}

}// FileListAdapter

解决方法:

您可以使用此代码,因为它为我工作：

public class soundTest extends Activity {

private ListView lv1;

private String lv_arr[]={"test 1","test 2","test 3","test 4","test 5"};

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

lv1=(ListView)findViewById(R.id.ListView01);

lv1.setAdapter(new ArrayAdapter(this,R.layout.list_item, lv_arr));

lv1.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView> parent, View view,int position, long id) {

if (lv1.getItemAtPosition(position)=="test 1") {

MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.sound1);

mp.start();

mp.setOnCompletionListener(new OnCompletionListener() {

public void onCompletion(MediaPlayer mp) {

mp.release();

}

});

}

if (lv1.getItemAtPosition(position)=="test 2") {

MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.sound2);

mp.start();

mp.setOnCompletionListener(new OnCompletionListener() {

public void onCompletion(MediaPlayer mp) {

mp.release();

}

});

}

//And the rest of the sounds 3,4,5.

}

});

}

}

全局变量MediaPlayer需要设置为private static.这引起了我好几次.

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