我想在listview中显示带有专辑名称的专辑封面。但我没有得到显示专辑封面的方式。我试过cover art on android。
这是我的代码：
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();
}
但我得到的是album_id -1。所以我没有获得专辑的album_id，但我在我的SD卡上有专辑歌曲。并且sdcard有像 albumthums 这样的文件夹，其中包含一些文件。所以，请给我解决方案，以获得专辑名称和艺术。 提前完成。
这是我的错误日志：
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)
答案 0 :(得分：23)
使用以下代码获取包含歌曲信息的专辑封面。您可以稍微更改以仅显示专辑名称而不是歌曲列表。
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();
}
}
答案 1 :(得分：0)
获取ALBUM_ART的非常简单的代码。永远记住你应该读取存储权限。
final Uri uri = MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI;
final Cursor cursor = getContentResolver().query(uri, null, null, null, null);
while (cursor.moveToNext()) {
final String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Albums.ARTIST));
final String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Albums.ALBUM));
final String albumart = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Albums.ALBUM_ART));
arrayList.add(artist);
}