我想通过使用 CursorLoader
查询 MediaStore
来获取专辑的歌曲列表
我该怎么做?我可以使用此代码获取设备的所有歌曲:
static final String[] TRACK_SUMMARY_PROJECTION = { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE};
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";
String select = null;
return new CursorLoader(getActivity(), MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
TRACK_SUMMARY_PROJECTION, select, null,
sortOrder);
}
我应该在代码中添加什么或修改以过滤特定专辑的歌曲?
最佳答案
一步一步走
第1步查看手机上加载的相册名称
请求光标获取专辑信息
String[] columns = { android.provider.MediaStore.Audio.Albums._ID,
android.provider.MediaStore.Audio.Albums.ALBUM };
cursor = managedQuery(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
columns, null, null, null);
第2步找到所有专辑名称后,您可以写下想要的专辑名称并从中查询歌曲
请求包含特定专辑歌曲信息的光标
String[] columns = { MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.MIME_TYPE, };
String where = android.provider.MediaStore.Audio.Media.ALBUM
+ "=?";
String whereVal[] = { Album name from which you want songs };
String orderBy = android.provider.MediaStore.Audio.Media.TITLE;
cursor = managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns,
where, whereVal, orderBy);
现在返回这个游标。
以下是用于检索专辑名称和其中所有歌曲的源代码供您引用。
package org.vipul;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
public class HelloActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] columns = { android.provider.MediaStore.Audio.Albums._ID,
android.provider.MediaStore.Audio.Albums.ALBUM };
Cursor cursor = managedQuery(
MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, columns, null,
null, null);
if (cursor.moveToFirst()) {
do {
Log.v("Vipul",
cursor.getString(cursor
.getColumnIndex(android.provider.MediaStore.Audio.Albums.ALBUM)));
} while (cursor.moveToNext());
}
// I want to list down song in album Rolling Papers (Deluxe Version)
String[] column = { MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.MIME_TYPE, };
String where = android.provider.MediaStore.Audio.Media.ALBUM + "=?";
String whereVal[] = { "Rolling Papers (Deluxe Version)" };
String orderBy = android.provider.MediaStore.Audio.Media.TITLE;
cursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
column, where, whereVal, orderBy);
if (cursor.moveToFirst()) {
do {
Log.v("Vipul",
cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)));
} while (cursor.moveToNext());
}
}
}
关于android - 使用 CursorLoader 查询专辑中的歌曲,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11065377/