快速查询图片

Cursor c = getContentResolver().query( Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null );
		if ( c != null ) {
		    if (c.moveToFirst()) {            
		           do {         
						long id = c.getLong( c.getColumnIndex( Images.Media._ID ) );
						Uri imageUri = Uri.parse( Images.Media.EXTERNAL_CONTENT_URI + "/" + id );  	 
						arrayList.add(imageUri);
						//imageUrls.add(getRealFilePath(MainActivity.this, imageUri));
		          } while (c.moveToNext());         
		       }
		}	
		c.close();
		c = null;