从MediaStore得到所有的音轨
从MediaStore得到所有的音轨
提问于 2014-04-03 12:15:20
我试着从MediaStore得到所有的音轨。
Cursor cursor = managedQuery(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, null, null, null, null);
while (cursor.moveToNext())
{
int id = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.AudioColumns._ID));
String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AudioColumns.TITLE));
String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AudioColumns.ALBUM));
String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.AudioColumns.ARTIST));
int duration = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DURATION));
}
cursor.close();但是我不能从光标中读取值。当我运行这段代码时
MediaStore.Audio.AudioColumns.TITLE,
MediaStore.Audio.AudioColumns.ALBUM,
MediaStore.Audio.AudioColumns.ARTIST and
MediaStore.Audio.AudioColumns.DURATION 常量为空。
我必须使用哪些常量来获得上述结果中的值？
回答 1
Stack Overflow用户
回答已采纳
发布于 2014-04-04 08:01:11
设置列和uri返回：
final String track_id = MediaStore.Audio.Media._ID;
final String track_no = MediaStore.Audio.Media.TRACK;
final String track_name = MediaStore.Audio.Media.TITLE;
final String artist = MediaStore.Audio.Media.ARTIST;
final String duration = MediaStore.Audio.Media.DURATION;
final String album = MediaStore.Audio.Media.ALBUM;
final String composer = MediaStore.Audio.Media.COMPOSER;
final String year = MediaStore.Audio.Media.YEAR;
final String path = MediaStore.Audio.Media.DATA;
final String date_added = MediaStore.Audio.Media.DATE_ADDED;
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;找出所有的痕迹：
public Cursor getTrackTrackcursor(Context context, Cursor cursor) {
// gets all tracks
ContentResolver cr = context.getContentResolver();
final String[] columns = { track_id, track_no, artist, track_name,
album, duration, path, year, composer };
cursor = cr.query(uri, columns, null, null, null);
return cursor;
}现在循环遍历游标并根据返回的列提取字符串值。您只能提取游标返回的列，这样就会发生错误，因为我没有返回NUMBER_OF_SONGS。您必须确保游标也返回这一点，例如：
String stralbum = (c.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ALBUM)));
String strartist = (cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ARTIST)));
String stryear = (cursor.getString(cusrsor
.getColumnIndex(MediaStore.Audio.Albums.FIRST_YEAR)));
String strnosongs = (cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.NUMBER_OF_SONGS)));您是99%正确，但您的uri需要列布局。希望这能有所帮助
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原文链接：
https://stackoverflow.com/questions/22837474
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