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String[] projection = {MediaStore.Audio.Media.DATA};
Cursor cursor = managedQuery( MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection,
null,
null,
null);
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToFirst();
String audioPath = cursor.getString(columnIndex);
for(int i=0;i<cursor.getColumnCount();++i){
Log.i(TAG,"-----column name:"+cursor.getColumnName(i));
}