Android 使用MediaStore.Images和 Cursor查詢本地圖片和圖片縮略圖

先看一個實例：

String[] projection = { MediaStore.Images.Thumbnails._ID ,MediaStore.Images.Thumbnails.DATA};
Cursor cursor = mActivity.getContentResolver().query(
    MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,//指定縮略圖數據庫的Uri
    projection,//指定所要查詢的字段
    MediaStore.Images.Thumbnails._ID + " = ?",//查詢條件
    new String[] {"123" }, //查詢條件中問號對應的值
    null);
cursor.moveToFirst();
String id = cursor.getString(0);
String data = cursor.getString(1);

查詢圖片縮略圖數據庫，獲取id等於123的縮略圖信息。

轉換成Sql語句即為 select MediaStore.Images.Thumbnails._ID ,MediaStore.Images.Thumbnails.DATA from MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI where MediaStore.Images.Thumbnails._ID = 123

如果要查詢圖片，Uri地址為：MediaStore.Images.Media.EXTERNAL_CONTENT_URI

當要獲取縮略圖時：Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail  (mActivity.getContentResolver(),  id, Thumbnails.MICRO_KIND, null)