Android-listview、服务媒体播放器和布尔标志

问题描述

我目前有一个 listview，当您单击一个项目时，它会运行一个带有 mediaplayer 的 service.如果我单击 listview 中的另一个项目，正在运行的 service 应该停止并运行新的 service.我正在使用 boolean isRunning 设置为 false，并且在创建服务时它返回 true.然后在 listview 中，我在 if 语句中调用该标志.但是，它并不完全有效.我想我可能做错了.有什么想法吗?

I currently have a listview and when you click on an item it runs a service with a mediaplayer. If I click on another item in the listview the service that's running should stop and run the new service. I am using a boolean isRunning set to false and when the service is created it returns true. Then in the listview I call that flag in an if statement. However, its not exactly working. I think I may be doing this wrong. Any ideas?

这听起来可能使我描述它的方式令人困惑，所以这是我的 listview 和我的 service 的代码.我只是在案例 3 上测试这个(所以我按下这个项目来启动服务，然后点击案例 2 看它是否会停止它).

This probably sounds confusing the way I described it so Here is the code to my listview and my service. I am only testing this on case 3 (so I press this item to start the service and then click on case 2 to see if it will stop it).

列表视图类:

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:

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();
        /