使用相冊名稱獲取相冊藝術Android

Question

我想在列表視圖中顯示具有相冊名稱的相冊藝術。但我沒有辦法顯示專輯封面。我試過從cover art on android。

這裏是我的代碼：

Cursor cursor = managedQuery(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, null, null, null); 
      if (cursor == null) 
      { 
       //Query Failed , Handle error. 
      } 
      else if (!cursor.moveToFirst()) 
      { 
      //No media on the device. 
      } 
      else 
      { 
       int titleColumn = cursor.getColumnIndex(android.provider.MediaStore.Audio.Albums.ALBUM_ART); 
       int id = cursor.getColumnIndex(android.provider.MediaStore.Audio.Albums.ALBUM_ID); //here value i m getting -1 . 

       for(int i=0;i<cursor.getCount();i++) 
       { 
        if(id<0) 
        { 
         Long album =Long.parseLong(cursor.getString(id)); 
         String coverPath = cursor.getString(titleColumn); 

         Context context = null; 
         ContentResolver res = context.getContentResolver(); 
         Uri uri = ContentUris.withAppendedId(sArtworkUri, album); 
         if (uri != null) 
         { 
          InputStream in = null; 
          try 
          { 
           in = res.openInputStream(uri); 
           Bitmap b = BitmapFactory.decodeStream(in, null, sBitmapOptions); 
           ImageView coverAlbum=(ImageView)findViewById(R.id.thumbnail); 
           coverAlbum.setImageBitmap(b); 

          } catch (FileNotFoundException ex) 
          { 

          } 

         } 

        } 
         //code to insert in listview 
        cursor.moveToNext(); 
       } 
      } 
      cursor.close(); 
} 

但我得到album_id -1。所以我沒有得到album_id專輯，但我有我的SD卡專輯歌曲。和SD卡有像albumthums其中包括一些文件的文件夾。所以請給我解決方案，以獲得專輯名稱和藝術。 Thanx提前。

---

這是我的錯誤日誌：

12-03 15:19:22.051: WARN/System.err(32334): java.lang.NullPointerException 
12-03 15:19:22.060: WARN/System.err(32334):  at com.mnp.AlbumList.onCreate(AlbumList.java:59) 
12-03 15:19:22.120: WARN/System.err(32334):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
12-03 15:19:22.130: WARN/System.err(32334):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
12-03 15:19:22.140: WARN/System.err(32334):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
12-03 15:19:22.161: WARN/System.err(32334):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
12-03 15:19:22.171: WARN/System.err(32334):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
12-03 15:19:22.180: WARN/System.err(32334):  at android.os.Handler.dispatchMessage(Handler.java:99) 
12-03 15:19:22.201: WARN/System.err(32334):  at android.os.Looper.loop(Looper.java:123) 
12-03 15:19:22.210: WARN/System.err(32334):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
12-03 15:19:22.220: WARN/System.err(32334):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-03 15:19:22.240: WARN/System.err(32334):  at java.lang.reflect.Method.invoke(Method.java:521) 
12-03 15:19:22.250: WARN/System.err(32334):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
12-03 15:19:22.260: WARN/System.err(32334):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
12-03 15:19:22.270: WARN/System.err(32334):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

使用下面的代碼來獲得專輯封面與歌曲信息。您可以稍微更改以僅顯示專輯名稱而不是歌曲列表。

public class BrowseAudioActivity extends Activity implements 
      AppConstants { 
     private Context context; 
     private ArrayList<AudioListModel> audioArrayList = new ArrayList<AudioListModel>(); 
     private AudioListAdapter audioListAdapter; 
     private ListView audioListView; 



/** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); 
      setContentView(R.layout.audio_list); 
      UtilityClass.addActivityToStack(this); 
      context = this; 
      audioListView = (ListView) findViewById(R.id.list_audio); 

      new GetAudioListAsynkTask(context).execute((Void) null); 



     } 

     private void initLayout() { 
      final Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
      final String[] cursor_cols = { MediaStore.Audio.Media._ID, 
        MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM, 
        MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DATA, 
        MediaStore.Audio.Media.ALBUM_ID, 
        MediaStore.Audio.Media.DURATION }; 
      final String where = MediaStore.Audio.Media.IS_MUSIC + "=1"; 
      final Cursor cursor = context.getContentResolver().query(uri, 
        cursor_cols, where, null, null); 

      while (cursor.moveToNext()) { 
       String artist = cursor.getString(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); 
       String album = cursor.getString(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM)); 
       String track = cursor.getString(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)); 
       String data = cursor.getString(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); 
       Long albumId = cursor.getLong(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID)); 

       int duration = cursor.getInt(cursor 
         .getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); 

       Uri sArtworkUri = Uri 
         .parse("content://media/external/audio/albumart"); 
       Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId); 

       Logger.debug(albumArtUri.toString()); 
       Bitmap bitmap = null; 
       try { 
        bitmap = MediaStore.Images.Media.getBitmap(
          context.getContentResolver(), albumArtUri); 
        bitmap = Bitmap.createScaledBitmap(bitmap, 30, 30, true); 

       } catch (FileNotFoundException exception) { 
        exception.printStackTrace(); 
        bitmap = BitmapFactory.decodeResource(context.getResources(), 
          R.drawable.audio_file); 
       } catch (IOException e) { 

        e.printStackTrace(); 
       } 

       AudioListModel audioListModel = new AudioListModel(); 
       audioListModel.setArtist(artist); 
       audioListModel.setBitmap(bitmap); 
       audioListModel.setAlbum(album); 
       audioListModel.setTrack(track); 
       audioListModel.setData(data); 
       audioListModel.setAlbumId(albumId); 
       audioListModel.setDuration(duration); 
       audioListModel.setAlbumArtUri(albumArtUri); 

       audioArrayList.add(audioListModel); 

      } 

     } 

     public String getRealPathFromURI(Uri contentUri) { 
      String[] proj = { MediaStore.Images.Media.DATA }; 
      Cursor cursor = context.getContentResolver().query(contentUri, proj, 
        null, null, null); 
      int column_index = cursor 
        .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA); 
      cursor.moveToFirst(); 
      return cursor.getString(column_index); 
     } 

     private class GetAudioListAsynkTask extends AsyncTask<Void, Void, Boolean> { 

      private Context context; 
      private CustomProgressDialog progressDialog; 

      public GetAudioListAsynkTask(Context context) { 

       this.context = context; 
      } 

      @Override 
      protected void onPreExecute() { 
       progressDialog = new CustomProgressDialog(context, 
         AUDIO_LOADING_HEADING, AUDIO_LOADING_MSG); 
       progressDialog.setCancelable(false); 
       progressDialog.show(); 
       super.onPreExecute(); 

      } 

      @Override 
      protected Boolean doInBackground(Void... params) { 
       try { 
        initLayout(); 

        return true; 
       } catch (Exception e) { 
        return false; 

       } 

      } 

      @Override 
      protected void onPostExecute(Boolean result) { 
       progressDialog.dismiss(); 

       audioListAdapter = new AudioListAdapter(context, audioArrayList); 
       audioListView.setAdapter(audioListAdapter); 
       audioListView 
         .setOnItemClickListener(new AudioListItemClickListener(
           context, audioArrayList)); 

      } 
     } 

     @Override 
     protected void onPause() { 
      super.onPause(); 
      overridePendingTransition(0, 0); 
     } 

     @Override 
     protected void onDestroy() { 
      super.onDestroy(); 
      UtilityClass.removeActivityOnFinish(this); 
     } 

     @Override 
     public void onBackPressed() { 
      super.onBackPressed(); 
      finish(); 
     } 

    }