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<HashMap<String,String>> arrList = new ArrayList<HashMap<String,String>>();;String[] strArray = { "/mnt/sdcard/Nal.mp3","/mnt/sdcard/Nal2.mp3","/mnt/sdcard/Nal3.mp3","/mnt/sdcard/sample1.mp3",};@OverrIDeprotected 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<String,String> hmap = new HashMap<String,String>(); 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<HashMap<String,String>> data; private LayoutInflater inflater = null; public filelistadapter(ArrayList<HashMap<String,String>> 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<String>(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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