以下是我获取给定图像缩略图的代码。截至目前，我得到的例外是“光标越界”
我认为这可能是因为我没有在任何地方附加图像 URL。我对在哪里做这件事有点困惑。所以 2 个问题： 1. 我在哪里使用要获取缩略图的图像 URL 2. 应该打印列名的 for 循环除了第一条语句“COLUMN NAMES”之外什么都不打印
//get the corresponding thumbnail
String lastImageTakenPath = MyActivity.this.savedInstanceStateVariable.getString("lastImageTaken");
System.out.println("previous image is "+ lastImageTakenPath);
ContentResolver cr = getContentResolver();
if(cr != null){
String[] projection = { MediaStore.Images.Media._ID };
Cursor cursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,projection,null,null,null);
//Cursor cursor = cr.query(lastImageTakenURI, null, null, null, null);
//Activity.startManagingCursor(cursor);
if(cursor != null){
String[] columnNames = cursor.getColumnNames();
System.out.println("COLUMN NAMES");
for(int i=0;i<columnNames.length; i++){
System.out.println(columnNames[i]);
}
/* 1. get the id of the image
* 2. use this id in the call, getThumbnails on MediaStore.Images.Thumbnails to obtain the
thumbnail
3.set the imageview's src to this thumbnail */
int imageID = cursor.getInt( cursor.getColumnIndex(MediaStore.Images.Media._ID) );
Uri uri = Uri.withAppendedPath( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, Integer.toString(imageID) );
// Get original image ID
String url = uri.toString();
int originalImageId = Integer.parseInt(url.substring(url.lastIndexOf("/") + 1, url.length()));
// Get (or create upon demand) the micro thumbnail for the original image.
thumbnailLastImage = MediaStore.Images.Thumbnails.getThumbnail(cr, originalImageId, MediaStore.Images.Thumbnails.MICRO_KIND,null);
thumbnailImage.setImageBitmap(thumbnailLastImage);
}
else{
System.out.println("Cursor is NULL");
}
}
else{
Log.d(TAG,"ContentResolver is NULL");
}