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這是項目的一部分，主要關注的是當我想停止線程，然後我的進度條應該到達起點並且線程必須停止。 但是這並沒有發生在我的演示中。我無法在此使用異步任務。在這個特定的例子中，我怎樣才能停止線程？ Thread.stop，notify，布爾標誌不起作用。如何停止在android中使用線程運行的進度條？
public class AudioPlayer2 extends BaseScreen implements OnClickListener {
// private static final String TAG = "ServicesDemo";
Button buttonPause, buttonStart, buttonStop,buttonForward,buttonBackward;
//String uri;
private final String TAG = AudioPlayer2.class.getSimpleName();
private String uri, albumArtUri;
private MediaPlayer mp;
VideoView vv;
ImageView iv, ivAlbumArt;
Uri albumImageUri;
ArrayList<Track> tracks;
static Uri sArtworkUri;
public LinearLayout addvideo;
private String songName, albumName;
private TextView tvName, tvAlbum;
private static int current_song;
private static long album_id;
public ProgressBar seekbar;
public int myProgress=0;
public MyService myservice;
//public static double duration=0;
String bundleDuration;
myThread mt;
Thread t;
private volatile boolean flag;
String nextDuration=null;
long seekbarProgress=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.audio);
seekbar = (ProgressBar)findViewById(R.id.seekbar);
/* myservice = this.myService;
myservice.AP2 = AudioPlayer2.this;*/
uri = this.getIntent().getExtras().getString("song_uri");
buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
buttonPause = (Button) findViewById(R.id.buttonPause);
tracks = dbManager.getInstance().getAllSongs(AudioPlayer2.this);
buttonForward = (Button) findViewById(R.id.buttonforward);
buttonBackward = (Button) findViewById(R.id.buttonbackward);
//=========================================================================================
sArtworkUri = Uri.parse("content://media/external/audio/albumart");
Uri path = Uri.parse(uri);
current_song=this.getIntent().getExtras().getInt("current_song");
albumArtUri = this.getIntent().getExtras().getString("album_art");
bundleDuration = this.getIntent().getExtras().getString("duration");
Log.d("+++++++++++++++++++Duration", bundleDuration);
Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
album_id = Long.parseLong(this.getIntent().getStringExtra("album_id"));
int id = Integer.parseInt(this.getIntent().getStringExtra("album_id"));
//Toast.makeText(AudioPlayer2.this, ""+Long.parseLong(bundleDuration), Toast.LENGTH_SHORT).show();
seekbar.setProgress(0);
albumImageUri = ContentUris.withAppendedId(sArtworkUri, album_id);
ivAlbumArt = (ImageView) findViewById(R.id.album_art);
songName = this.getIntent().getStringExtra("song_name");
albumName = this.getIntent().getStringExtra("album_name");
tvName = (TextView) findViewById(R.id.tv_name);
tvAlbum = (TextView) findViewById(R.id.tv_album);
if (songName != null) {
tvName.setText(songName);
}
if (albumName != null) {
tvAlbum.setText(albumName);
}
if (DataManager.getInstance().getOnPausedSong()=="y"){
if(DataManager.getInstance().getPausedSongName()==songName){
buttonStart.setVisibility(View.GONE);
buttonPause.setVisibility(View.VISIBLE);
}
}
stopService(new Intent(this, MyService.class));
Intent intent = new Intent(this,MyService.class);
Bundle b = new Bundle();
b.putString("song_uri",uri);
intent.putExtras(b);
startService(intent);
mt = new myThread();
t = new Thread(mt);
mt.start();
buttonStart.setVisibility(View.GONE);
buttonPause.setVisibility(View.VISIBLE);
//=======================================================================================
buttonStop.setVisibility(View.GONE);
buttonStart.setOnClickListener(this);
buttonPause.setOnClickListener(this);
buttonForward.setOnClickListener(this);
buttonBackward.setOnClickListener(this);
buttonStop.setOnClickListener(this);
buttonStart.performClick();
}
public void onClick(View src) {
switch (src.getId()) {
case R.id.buttonStart:
if(DataManager.getInstance().getSongPause()=="y"){
myService.player.start();
DataManager.getInstance().setSongPause("n");
buttonStart.setVisibility(View.GONE);
buttonPause.setVisibility(View.VISIBLE);
if(mt.paused==true){
mt.unPauseProgressBar();
}
}else{
stopService(new Intent(this, MyService.class));
DataManager.getInstance().setSong_uri(uri);
Intent intent = new Intent(this,MyService.class);
Bundle b = new Bundle();
b.putString("song_uri",uri);
intent.putExtras(b);
startService(intent);
buttonStart.setVisibility(View.GONE);
buttonPause.setVisibility(View.VISIBLE);
DataManager.getInstance().setOnPausedSong("y");
DataManager.getInstance().setPausedSongName(songName);
}
break;
case R.id.buttonStop:
Log.d(TAG, "onClick: stopping srvice");
stopService(new Intent(this, MyService.class));
buttonStart.setVisibility(View.VISIBLE);
buttonPause.setVisibility(View.GONE);
mt=null;
seekbar.setProgress(0);
mt.stopProgressBar();
//mt.destroy();
//mt.notify();
break;
case R.id.buttonforward:
stopService(new Intent(this, MyService.class));
current_song++;
FetchAllMusic fetchAllMusic = new FetchAllMusic();
fetchAllMusic.execute();
flag=false;
myProgress=0;
bundleDuration=tracks.get(current_song).getDuration();
Toast.makeText(this, tracks.get(current_song++).getDuration(), Toast.LENGTH_LONG).show();
// Log.d("aaaaaaaaaaaaaaa", nextDuration);
//seekbar.setProgress(0);
myThread mt2=new myThread();
mt2.start();
//new Thread(myThread).start();
break;
case R.id.buttonbackward:
Log.d(TAG, "onClick: stopping service");
stopService(new Intent(this, MyService.class));
if(current_song>0){
current_song--;
}
FetchAllMusic fetchAllMusic2 = new FetchAllMusic();
fetchAllMusic2.execute();
break;
case R.id.buttonPause:
buttonStart.setVisibility(View.VISIBLE);
buttonPause.setVisibility(View.GONE);
myService.player.pause();
DataManager.getInstance().setSongPause("y");
DataManager.getInstance().setWantsToPlaySong(false);
DataManager.getInstance().setOnPausedSong("n");
DataManager.getInstance().setPausedSongName(songName);
mt.pauseProgressBar();
}
}
public void getDuration(String duration){
Log.d(TAG,"BeforeToast");
Log.d(TAG,"After Toast");
seekbarProgress = Long.parseLong(duration);
seekbar.setProgress(1);
Log.d(TAG,"Before thread.start");
Log.d(TAG,"After thread.start");
}
class myThread extends Thread implements Runnable{
// long duration=DataManager.getInstance().getSong_duration();
//long value=duration/100;
private volatile boolean paused = false;
private volatile boolean finished = false;
@Override
public void run()
{
if(flag==false)
{
mt.currentThread().notify();
}
{
while(!finished){
while (myProgress<100){
try{
Log.d(TAG, "Thread Starts");
// myHandle.sendMessage(myHandle.obtainMessage());
myProgress++;
Log.d("+++++++++AA+++++++++++++",""+bundleDuration);
seekbar.setProgress(myProgress);
Thread.sleep(Long.parseLong(bundleDuration)/100);
Log.d(TAG,"Passed thread.sleep");
}
catch(Throwable t){
Log.e("+++++++++++++++++++++++++++", "no duration");
}
while(paused && !finished){
try{
Thread.sleep(1000); //Busy wait - should really use wait/notify, but that's another lesson
}
catch(InterruptedException e){
}
}
}
}
} //=============================
}
public synchronized void pauseProgressBar(){
paused = true;
}
public synchronized void unPauseProgressBar(){
paused = false;
//call notify() here when you switch to wait/notify.
}
public synchronized void stopProgressBar(){
finished = true;
stop();
mt = null;
notify();
// destroy();
}
};