Android列表视图,服务媒体播放器和布尔标志

概述我目前有一个列表视图,当您点击某个项目时,它会使用媒体播放器运行服务.如果我单击列表视图中的另一个项目,则运行的服务应该停止并运行新服务.我使用booleanisRunning设置为false,并在创建服务时返回true.然后在listview中,我在if语句中调用该标志.但是,它并不完全正常.我想我可

我目前有一个列表视图,当您点击某个项目时,它会使用媒体播放器运行服务.如果我单击列表视图中的另一个项目,则运行的服务应该停止并运行新服务.我使用boolean isRunning设置为false,并在创建服务时返回true.然后在ListvIEw中,我在if语句中调用该标志.但是,它并不完全正常.我想我可能做错了.有任何想法吗？

这可能听起来让我感到困惑,因为这是我的ListvIEw和我的服务的代码.我只在案例3中对此进行测试(因此,我按此项目启动服务,然后单击案例2以查看是否会停止它).

ListvIEw类：

public class PlayListActivity extends ListActivity{    private static final String TAG = PlayListActivity.class.getSimplename();    // Data to put in the listadapter    private String[] sdrPlayListnames = new String[] {            "Best of June 2011", "Best of May 2011", "dubstep",            "House", "Other"};    private listadapter sdrlistadapter;    Intent playbackServiceIntentBOJ, playbackServiceIntentBOM, playbackServiceIntentdub;    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.playLists_layout);        //fill the screen with the List adapter        playListFillData();        playbackServiceIntentdub = new Intent(this, dubAudioService.class);        Log.d(TAG, "Made dub Service Intent");    }    public voID playListFillData() {        //create and set up the Array adapter for the List vIEw        ArrayAdapter sdrlistadapter = new ArrayAdapter(this, R.layout.List_item, sdrPlayListnames);        setlistadapter(sdrlistadapter);    }    //set up the on List item Click     @OverrIDe    protected voID onListItemClick(ListVIEw l, VIEw v, int position, long ID) {        super.onListItemClick(l, v, position, ID);        //create a switch so that each List item is a different playList        switch(position){        case 0:            Intent BOJintent = new Intent(this, BOJAudioActivity.class);            // Create the vIEw using PlayListGroup's LocalActivityManager            VIEw vIEw = PlayListGroup.group.getLocalActivityManager()            .startActivity("show_city", BOJintent            .addFlags(Intent.FLAG_ACTIVITY_CLEAR_top))            .getDecorVIEw();            // Again, replace the vIEw            PlayListGroup.group.replaceVIEw(vIEw);         //   playbackServiceIntentBOJ = new Intent(this, BOJAudioService.class);                Log.d(TAG, "Made BOJ Intent");        //  startService(playbackServiceIntentBOJ);                Log.d(TAG, "started BOJ Service");            break;        case 1:            Intent BOMintent = new Intent(this, BOMAudioActivity.class);            // Create the vIEw using PlayListGroup's LocalActivityManager            VIEw vIEw2 = PlayListGroup.group.getLocalActivityManager()            .startActivity("show_city", BOMintent            .addFlags(Intent.FLAG_ACTIVITY_CLEAR_top))            .getDecorVIEw();            // Again, replace the vIEw           PlayListGroup.group.replaceVIEw(vIEw2);                Log.d(TAG, "Replace vIEw");                //getApplicationContext().stopService(playbackServiceIntentBOJ);            //playbackServiceIntentBOM = new Intent(this, BOJAudioService.class);                Log.d(TAG, "Made BOM Service Intent");        //  startService(playbackServiceIntentBOM);                Log.d(TAG, "started BOM Service");                if(dubAudioActivity.isRunningdub = true){                    stopService(playbackServiceIntentdub);                    Log.d(TAG, "stop service isRunningdub");                }//            break;        case 2:            Intent dubIntent = new Intent (this, dubAudioActivity.class);            VIEw vIEw3 = PlayListGroup.group.getLocalActivityManager()                        .startActivity("show_city", dubIntent                                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_top))                                .getDecorVIEw();            PlayListGroup.group.replaceVIEw(vIEw3);                Log.d(TAG, "Replace vIEw");            startService(playbackServiceIntentdub);                Log.d(TAG, "started dub service");            break;        }    }}

服务类别：

public class dubAudioService extends Service implements OnPreparedListener, OnCompletionListener{Toast loadingMessage;private static final String TAG = dubAudioService.class.getSimplename();    public static boolean isRunningdub = false;    //to keep track of the playList item    Vector<PlayListfile> playListItems;    MediaPlayer mediaPlayer;    String baseURL = "";    //keep track of which item from the vector we are on    int currentPlayListltemNumber = 0;    public class dubBackgroundAudioServiceBinder extends Binder {        dubAudioService getService() {        return dubAudioService.this;        }    }    private final IBinder basBinderdub = new dubBackgroundAudioServiceBinder();    @OverrIDe    public IBinder onBind(Intent intent) {        return basBinderdub;    }    @OverrIDe    public voID onCreate() {        Log.v("PLAYERSERVICE", "onCreate");        mediaPlayer = new MediaPlayer();        new MusicAsync().execute();            Log.d(TAG, "execute'd async");        mediaPlayer.setonPreparedListener(this);            Log.d(TAG, "set on prepared Listener");        mediaPlayer.setonCompletionListener(this);            Log.d(TAG, "set on completion Listener");            isRunningdub = true;            Log.d(TAG, "isRunningRUB = true");    }    @OverrIDe    public int onStartCommand(Intent intent, int flags, int startID) {        //if (!mediaPlayer.isPlaying()) {        //  mediaPlayer.start();        //}        return START_STICKY;    }    class MusicAsync extends AsyncTask<VoID,VoID,VoID>{        @OverrIDe        protected voID onPreExecute(){        }        @OverrIDe        protected VoID doInBackground(VoID... arg0) {            // Todo auto-generated method stub            //create empty vector             playListItems = new Vector<PlayListfile>();            //http clIEnt library            httpClIEnt httpClIEnt = new DefaulthttpClIEnt();            httpGet getRequest = new httpGet ("http://dl.dropBox.com/u/24535120/m3u%20playList/dubstepPlayList.m3u"); //i think you Could add the m3u thing in here             Log.v("URI",getRequest.getURI().toString());            try {            httpResponse httpResponse = httpClIEnt.execute(getRequest);            if (httpResponse.getStatusline().getStatusCode() != httpStatus.SC_OK) {            // ERROR MESSAGE            Log.v("http ERROR",httpResponse.getStatusline().getReasonPhrase());            }            else {                inputStream inputStream = httpResponse.getEntity().getContent();                 BufferedReader bufferedReader = new BufferedReader(new inputStreamReader(inputStream));                String line;                while ((line = bufferedReader.readline()) != null) {                     Log.v("PLAYListliNE","ORIG: " + line);                    if (line.startsWith("#")) {                        //Metadata                        //Could do more with this but not fo Now                    } else if (line.length() > 0) {                        String filePath = "";                            if (line.startsWith("http://")) {                            // Assume its a full URL                                 filePath = line;                            } else {                            //Assume it’s relative                            filePath = getRequest.getURI().resolve(line).toString();                            }                            PlayListfile playListfile = new PlayListfile(filePath);                            playListItems.add (playListfile);                            }                            }                            inputStream.close();                            }                            } catch (ClIEntProtocolException e) {                                 e.printstacktrace();                            } catch (IOException e) {                            e. printstacktrace();                            }                            currentPlayListltemNumber = 0;                            if (playListItems.size() > 0)                            {                            String path = ((PlayListfile)playListItems.get(currentPlayListltemNumber)).getfilePath();                            try {                                mediaPlayer.setDataSource(path);                            mediaPlayer.prepareAsync();}                            catch (IllegalArgumentException e)                             { e.printstacktrace();                            }catch (IllegalStateException e) {                                 e.printstacktrace();                            }catch (IOException e) {                            e.printstacktrace();}                            }            return null;        }        //        protected voID onPostExecute(VoID result){            //playbutton. setEnabled (false);        }    }    @OverrIDe    public voID onStart(Intent intent, int startID) {        super.onStart(intent, startID);    }    public voID onDestroy() {        if (mediaPlayer.isPlaying()) {            mediaPlayer.stop();            Log.d(TAG, "music stopp'd");        }        //mediaPlayer.release();        Log.d(TAG, "onDestroy");    }    @OverrIDe    public voID onPrepared(MediaPlayer mediaPlayer) {        // Todo auto-generated method stub\        Log.d(TAG, "music is prepared and will start");        mediaPlayer.start();    }    public voID onCompletion(MediaPlayer _mediaPlayer) {        Log.d(TAG, "Song completed, next song");        mediaPlayer.stop();        mediaPlayer.reset();            if (playListItems.size() > currentPlayListltemNumber + 1) {                 currentPlayListltemNumber++;            String path =                ((PlayListfile)playListItems.get(currentPlayListltemNumber)).getfilePath();                try {                    mediaPlayer.setDataSource(path);                    mediaPlayer.prepareAsync();                } catch (IllegalArgumentException e) {                     e. printstacktrace();                } catch (IllegalStateException e) {                     e.printstacktrace();                } catch (IOException e) {                    e.printstacktrace();                }            }       }    class PlayListfile {        String filePath;            public PlayListfile(String _filePath) {                filePath = _filePath;            }            public voID setfilePath(String _filePath) {                filePath = _filePath;            }            public String getfilePath() {                return filePath;            }        }    public voID playSong(){        Log.d(TAG, "start'd");        mediaPlayer.start();    }    public voID pauseSong(){        Log.d(TAG, "pause'd");        mediaPlayer.pause();    }}

解决方法:

这变得非常复杂,但我使用以下内容来查看我的服务是否正在运行：

private boolean isMyServiceRunning() {ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {    if ("com.example.MyService".equals(service.service.getClassname())) {        return true;    }}return false;}

我在ListvIEw类中添加了这个,并在每种情况下放置if语句以查看它是否正在运行,如果是,则会停止服务.

我还将我的所有绑定conenctions公开,以便ListvIEw类可以访问它们并在单击时启动它们.

如果有人想进一步了解等,请给我留言.

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