android 获取缩略图路径,android – 获取图像缩略图文件路径

我正在尝试获取thumnail路径,而不是位图对象.

当我查询这些时,由于某种原因,某些缩略图路径为空.

(我的设备中有1028个缩略图,光标长度确实是1028,但仍然返回空值)我知道有1028个缩略图,因为我查了一下.

这是我的代码：

String[] projection = {MediaStore.Images.Thumbnails._ID};

// Create the cursor pointing to the SDCard

cursor = this.getContentResolver().query( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,

projection, // Which columns to return

null, // Return all rows

null,

MediaStore.Images.Thumbnails.IMAGE_ID);

// Get the column index of the Thumbnails Image ID

Log.d(Global.TAG, "BEFORE");

columnIndex = cursor.getColumnIndex(MediaStore.Images.Thumbnails._ID);

Log.d(Global.TAG, "AFTER1");

for(int i =0;i

cursor.moveToPosition(i);

Log.d("MyTag","BBABA" + i +" : " + getThumbnailPathForLocalFile(cursor.getLong(columnIndex)));

}

cursor.close();

我的getThumbnailPathForLocalFile：

String getThumbnailPathForLocalFile(long fileId)

{

// Log.d(Global., msg)

Cursor thumbCursor = null;

try

{

thumbCursor = this.getContentResolver().

query(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI

, null

, MediaStore.Images.Thumbnails.IMAGE_ID + " = " + fileId+ " AND "

+ MediaStore.Images.Thumbnails.KIND + " = "

+ MediaStore.Images.Thumbnails.MINI_KIND , null, null);

if(thumbCursor.moveToFirst())

{

// the path is stored in the DATA column

int dataIndex = thumbCursor.getColumnIndexOrThrow( MediaStore.MediaColumns.DATA );

String thumbnailPath = thumbCursor.getString(dataIndex);

return thumbnailPath;

}

}

finally

{

if(thumbCursor != null)

{

thumbCursor.close();

}

}

return null;

}

检查后,我发现我发送的ID就像for循环的索引一样.

我甚至不确定我的代码应该工作,所以任何其他代码都会很棒.