问题很简单，媒体播放器在从远程服务器实现源时阻塞了 UI。我使用同步准备来初始化媒体播放器，但在重置媒体播放器时它会阻止 UI。
在这里，我使用线程编写了一个代码，它有很大帮助，但需要一个干净的解决方案。
public class QuranPlayerAct extends Activity implements DownloadMusicLstn,SeekBar.OnSeekBarChangeListener, OnClickListener,
MediaPlayer.OnPreparedListener, OnCompletionListener,
PlayerBtnClickedLstn, Runnable {
private static final int PLAY_FROM_LOCAL = 234;
private static final int PLAY_FROM_SERVER = 321;
private static final String TAG = "SongsListAct";
private static final int PAUSED = 756;
private static final int STARTED = 554;
private static final int STOPED = 386;
private static final int CLOSED = 453;
private TextView downloadEsplasedTV;
private RelativeLayout playerRetLay;
private ListView musicLst;
private ProgressBar dwnPrgV;
private ImageView playImgV;
private SeekBar songProgressBar;
private TextView songTitleLabel;
private TextView songCurrentDurationLabel;
private TextView songTotalDurationLabel;
private MediaPlayer mp;
private Utilities utils;
private Handler handler;
private boolean stopDownload;
private RelativeLayout downloadRetLay;
private ArrayList<String> musicFiles;
private ImageButton closeImgV;
private TextView downloadTitle;
private long currentDuration;
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
if (mPrepared) {
long totalDuration = mp.getDuration();
currentDuration = mp.getCurrentPosition();
songTotalDurationLabel.setText(""
+ utils.milliSecondsToTimer(totalDuration));
songCurrentDurationLabel.setText(""
+ utils.milliSecondsToTimer(currentDuration));
int progress = (int) (utils.getProgressPercentage(
currentDuration, totalDuration));
songProgressBar.setProgress(progress);
}
handler.postDelayed(this, 100);
}
};
private TextView downloadTotalTV;
private TextView downloadPercentageTV;
private ImageView stopImgV;
private ImageButton closeDownloadImgV;
private int fileSize;
private boolean mPrepared;
private ProgressBar songsLoadingPB;
private String url;
private String fName;
private boolean stopped;
private int plLoc;
private int track_no;
private int state;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_quran_player);
// setActionBar();
setActionBar2();
getRefs();
handler = new Handler();
initMediaPlayer();
playerRetLay.setVisibility(View.GONE);
// updateList();
createAppDirectory();
Thread t = new Thread(this);
t.start();
}
private void setActionBar2() {
final ActionBar bar = getActionBar();
bar.setDisplayShowHomeEnabled(false);
bar.setDisplayShowCustomEnabled(true);
bar.setDisplayShowTitleEnabled(false);
bar.setCustomView(R.layout.player_actionbar_lay);
}
/*
* private void setActionBar() { final ActionBar bar = getActionBar();
*
* bar.setDisplayShowHomeEnabled(false);
* bar.setDisplayShowCustomEnabled(true);
* bar.setDisplayShowTitleEnabled(false);
* bar.setCustomView(R.layout.player_actionbar_lay);
*
* TextView tv = (TextView) bar.getCustomView().findViewById(
* R.id.action_bar_title);
*
* try { tv.setTypeface(Typeface .createFromAsset(getAssets(),
* "DANUBE__.TTF")); } catch (Exception e) { e.printStackTrace(); } }
*/
@Override
public void onResume() {
super.onResume();
setVisiblilityToPlayerAndUI(false);
updateProgressBar();
if(state==CLOSED)playerRetLay.setVisibility(View.GONE);
}
@Override
public void onPause() {
super.onPause();
l("Activity paused");
stopDownload = true;
setVisiblilityToPlayerAndUI(false);
handler.removeCallbacks(mUpdateTimeTask);
if (mp != null)
switch (state) {
case STARTED:
mp.pause();
playImgV.setImageResource(R.drawable.play_img);
break;
}
}
private void getRefs() {
musicLst = (ListView) findViewById(R.id.musLst_lstV);
playerRetLay = (RelativeLayout) findViewById(R.id.musLst_player_retLay);
dwnPrgV = (ProgressBar) findViewById(R.id.musLst_down_progbarV);
downloadRetLay = (RelativeLayout) findViewById(R.id.musLst_dwn_retLay);
playImgV = (ImageView) findViewById(R.id.musLst_ply_btn);
songProgressBar = (SeekBar) findViewById(R.id.musLst_seek_bar);
songTitleLabel = (TextView) findViewById(R.id.musLst_mus_det_txt);
songCurrentDurationLabel = (TextView) findViewById(R.id.time_esplased_TV);
songTotalDurationLabel = (TextView) findViewById(R.id.total_time_TV);
closeImgV = (ImageButton) findViewById(R.id.musLst_close_btn);
downloadTitle = (TextView) findViewById(R.id.musLst_down_title_TV);
downloadEsplasedTV = (TextView) findViewById(R.id.time_esplased_TV22);
downloadTotalTV = (TextView) findViewById(R.id.total_time_TV2);
downloadPercentageTV = (TextView) findViewById(R.id.total_percentage);
stopImgV = (ImageView) findViewById(R.id.musLst_stop_btn);
closeDownloadImgV = (ImageButton) findViewById(R.id.close_down_btn);
songsLoadingPB = (ProgressBar) findViewById(R.id.songs_load_progressbar);
}
@Override
public void run() {
if (!isNetworkAvailable()) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(QuranPlayerAct.this,
"No Internet Connection Available",
Toast.LENGTH_LONG).show();
}
});
return;
}
MusicAppUtils appUtils = new MusicAppUtils();
String jsn = appUtils
.getDataFromUrl(MusicAppCommons.HTTP_AIMANSANGAM_COM_LISTFILES_PHP);
if (jsn == null)
return;
jsn = jsn.replace(",]", "]");
musicFiles = appUtils.parseMusicFilesJson(jsn);
updateList();
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
private void createAppDirectory() {
if (MusicAppCommons
.checkFileExist(MusicAppCommons.AIMANSANGAM_MUSIC_DIR)) {
Log.i(TAG, "app directory already exist");
return;
}
File dir = new File(MusicAppCommons.AIMANSANGAM_MUSIC_DIR);
if (dir.mkdirs())
Log.i(TAG, "app directory created");
}
private void setVisiblilityToPlayerAndUI(boolean b) {
if (b) {
songsLoadingPB.setVisibility(View.VISIBLE);
downloadRetLay.setVisibility(View.VISIBLE);
// playerRetLay.setVisibility(View.VISIBLE);
} else {
songsLoadingPB.setVisibility(View.GONE);
downloadRetLay.setVisibility(View.GONE);
// playerRetLay.setVisibility(View.GONE);
}
}
private void initMediaPlayer() {
utils = new Utilities();
mp = new MediaPlayer();
mp.setOnCompletionListener(this);
songProgressBar.setOnSeekBarChangeListener(this);
playImgV.setOnClickListener(this);
closeDownloadImgV.setOnClickListener(this);
closeImgV.setOnClickListener(this);
stopImgV.setOnClickListener(this);
}
private void resetTimeLabel() {
runOnUiThread(new Runnable() {
@Override
public void run() {
songTotalDurationLabel.setText("..");
songCurrentDurationLabel.setText("..");
}
});
}
public void updateProgressBar() {
handler.removeCallbacks(mUpdateTimeTask);
handler.postDelayed(mUpdateTimeTask, 100);
}
@Override
public void onDestroy() {
super.onDestroy();
handler.removeCallbacks(mUpdateTimeTask);
if (mp != null)
mp.release();
}
public void updateList() {
l("called update list");
if (musicFiles == null)
return;
updateMusicListView(MusicLstAdapter.MUSIC_NOT_DOWNLOADING);
}
private void updateMusicListView(int state) {
final MusicLstAdapter lstAdapter = new MusicLstAdapter(this,
musicFiles, this, state, this);
runOnUiThread(new Runnable() {
@Override
public void run() {
musicLst.setAdapter(lstAdapter);
lstAdapter.notifyDataSetChanged();
}
});
}
@Override
public void onClick(View v) {
if (v == closeDownloadImgV) {
downloadRetLay.setVisibility(View.GONE);
stopDownload = true;
Toast.makeText(this, "Download canceled", Toast.LENGTH_SHORT)
.show();
} else if (v == playImgV) {
if (stopped)
new PlayerThread();
if (mp.isPlaying()) {
if (mp != null) {
state = PAUSED;
mp.pause();
l("pause");
playImgV.setImageResource(R.drawable.play_img);
}
} else {
if (mp != null) {
state = STARTED;
mp.start();
l("start");
playImgV.setImageResource(R.drawable.pause_img);
}
}
} else if (v == closeImgV) {
l("close clicked");
state = CLOSED;
playerRetLay.setVisibility(View.GONE);
handler.removeCallbacks(mUpdateTimeTask);
mp.stop();
mPrepared = false;
new Thread(new Runnable() {
@Override
public void run() {
mp.reset();
}
}).start();
} else if (v == stopImgV) {
l("stop clicked");
state = STOPED;
handler.removeCallbacks(mUpdateTimeTask);
mp.stop();
resetTimeLabel();
playImgV.setImageResource(R.drawable.play_img);
stopped = true;
mPrepared = false;
}
}
// --------************************************************************************
@Override
public void setSize(final int fileSize) {
handler.post(new Runnable() {
@Override
public void run() {
dwnPrgV.setMax(fileSize);
QuranPlayerAct.this.fileSize = fileSize;
float size = (float) fileSize / 1048576;
DecimalFormat format = new DecimalFormat("#.##");
downloadTotalTV.setText(format.format(size) + " MB");
downloadPercentageTV.setText("0 %");
}
});
}
@Override
public void onProgressUpdate(final long total) {
handler.post(new Runnable() {
@Override
public void run() {
dwnPrgV.setProgress((int) total);
float size = (float) total / 1048576;
DecimalFormat format = new DecimalFormat("#.##");
downloadEsplasedTV.setText(format.format(size) + " MB");
float l = total / (float) fileSize * 100;
int round = Math.round(l);
downloadPercentageTV.setText(round + " %");
}
});
}
@Override
public void finished() {
handler.post(new Runnable() {
@Override
public void run() {
downloadRetLay.setVisibility(View.GONE);
}
});
updateMusicListView(MusicLstAdapter.MUSIC_NOT_DOWNLOADING);
}
@Override
public void onDownloadSuccess(boolean success) {
if (success) {
} else {
}
}
@Override
public boolean isStopDownload() {
return stopDownload;
}
@Override
public void downloadStarted(final String fName) {
stopDownload = false;
handler.post(new Runnable() {
@Override
public void run() {
downloadTitle.setText(fName);
downloadRetLay.setVisibility(View.VISIBLE);
}
});
updateMusicListView(MusicLstAdapter.MUSIC_DOWNLOADING);
}
// ----------------*****************************************************************************
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromTouch) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
handler.removeCallbacks(mUpdateTimeTask);
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
handler.removeCallbacks(mUpdateTimeTask);
int totalDuration = mp.getDuration();
int currentPosition = utils.progressToTimer(seekBar.getProgress(),
totalDuration);
mp.seekTo(currentPosition);
updateProgressBar();
}
@Override
public void onPrepared(MediaPlayer mp) {
l("onprepared");
mPrepared = true;
mp.start();
state = STARTED;
playImgV.setImageResource(R.drawable.pause_img);
}
private void l(String str) {
Log.i(TAG, str);
}
// ---------------------***************************************************************************
private class PlayerThread extends Thread {
public PlayerThread() {
start();
}
@Override
public void run() {
try {
stopped = false;
mPrepared = false;
resetTimeLabel();
mp.reset();
mp.setDataSource(url);
if (plLoc == PLAY_FROM_SERVER) {
mp.prepareAsync();
mp.setOnPreparedListener(QuranPlayerAct.this);
updatePlayerImg(R.drawable.play_img);
} else {
mp.prepare();
mp.start();
mPrepared = true;
state = STARTED;
updatePlayerImg(R.drawable.pause_img);
}
updatePlayerUI();
updateProgressBar();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void updatePlayerUI() {
runOnUiThread(new Runnable() {
@Override
public void run() {
songTitleLabel.setText(fName);
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
}
});
}
}
private void updatePlayerImg(final int playImg) {
runOnUiThread(new Runnable() {
@Override
public void run() {
playImgV.setImageResource(playImg);
}
});
}
// ------------------------------
@Override
public void onCompletion(MediaPlayer mp) {
track_no++;
if (track_no > musicFiles.size() - 1) {
track_no = 0;
}
playerRetLay.setVisibility(View.VISIBLE);
fName = musicFiles.get(track_no);
String filePath = MusicAppCommons.AIMANSANGAM_MUSIC_DIR + "/" + fName;
if (MusicAppCommons.checkFileExist(filePath)) {
url = filePath;
plLoc = PLAY_FROM_LOCAL;
} else {
url = MusicAppCommons.HTTP_AIMANSANGAM_COM_QURAN_FILES + fName;
url = url.replace(" ", "%20");
plLoc = PLAY_FROM_SERVER;
}
new PlayerThread();
}
@Override
public void clickedOnPlayBtn(int val) {
this.track_no = val;
l("song clicked");
playerRetLay.setVisibility(View.VISIBLE);
fName = musicFiles.get(val);
String filePath = MusicAppCommons.AIMANSANGAM_MUSIC_DIR + "/" + fName;
if (MusicAppCommons.checkFileExist(filePath)) {
url = filePath;
plLoc = PLAY_FROM_LOCAL;
} else {
url = MusicAppCommons.HTTP_AIMANSANGAM_COM_QURAN_FILES + fName;
url = url.replace(" ", "%20");
plLoc = PLAY_FROM_SERVER;
}
new PlayerThread();
}
}