火星男孩的分享空间

//构造方法：public final Cursor query (Uri uri, String[] projection,String selection,String[] selectionArgs, String sortOrder) //第一个参数：查询的uri Cursor cursor = contentResolver.query(ContactsCo

ContentResolver query 的参数：public final Cursor query (Uri uri, String[] projection,String selection,String[] selectionArgs, String sortOrder)Uri ：Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;//