android获取图片和视频的缩略图

获取图片缩略图：

Java代码

1. byte[] imageByte=getImageFromURL(urlPath.trim());
2. //以下是把图片转化为缩略图再加载
3. BitmapFactory.Options options = new BitmapFactory.Options();
4. options.inJustDecodeBounds = true;
5. BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,<span style="background-color: rgb(255, 255, 255);">options </span>); <span style="line-height: 25px; font-size: 14px; white-space: normal;"> //此时返回bitmap为空 </span>

byte[] imageByte=getImageFromURL(urlPath.trim()); 
			//以下是把图片转化为缩略图再加载
			BitmapFactory.Options options = new BitmapFactory.Options(); 
			options.inJustDecodeBounds = true;
			BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,options );    //此时返回bitmap为空 

Java代码

1. options.inJustDecodeBounds = false;
2. int be = (int)(options.outHeight / (float)200);
3. if (be <= 0){
4. be = 1;
5. }
6. options.inSampleSize = be;
7. return BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,options); //返回缩略图

			options.inJustDecodeBounds = false;
			int be = (int)(options.outHeight / (float)200); 
	        if (be <= 0){
	        	be = 1; 
	        }
	        options.inSampleSize = be;     
			return BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length,options);  //返回缩略图

获取视频缩略图：

/**

* 根据视频Uri地址取得指定的视频缩略图

* @param cr

* @param uri 本地视频Uri标示

* @return 返回bitmap类型数据

*/

public static Bitmap getVideoThumbnail(ContentResolver cr, Uri uri) {

Java代码

1. Bitmap bitmap = null;
2. BitmapFactory.Options options = new BitmapFactory.Options();
3. options.inDither = false;
4. options.inPreferredConfig = Bitmap.Config.ARGB_8888;
5. Cursor cursor = cr.query(uri,new String[] { MediaStore.Video.Media._ID }, null, null, null);
7. if (cursor == null || cursor.getCount() == 0) {
8. return null;
9. }
10. cursor.moveToFirst();
11. String videoId = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media._ID)); //image id in image table.s
13. if (videoId == null) {
14. return null;
15. }
16. cursor.close();
17. long videoIdLong = Long.parseLong(videoId);
18. bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, videoIdLong,Images.Thumbnails.MICRO_KIND, options);
20. return bitmap;
21. }

		Bitmap bitmap = null;
		BitmapFactory.Options options = new BitmapFactory.Options();
		options.inDither = false;
		options.inPreferredConfig = Bitmap.Config.ARGB_8888;
		Cursor cursor = cr.query(uri,new String[] { MediaStore.Video.Media._ID }, null, null, null); 
	
		if (cursor == null || cursor.getCount() == 0) {
		    return null;
		}
		cursor.moveToFirst();
		String videoId = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media._ID));  //image id in image table.s
	
		if (videoId == null) {
		return null;
		}
		cursor.close();
		long videoIdLong = Long.parseLong(videoId);
		bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, videoIdLong,Images.Thumbnails.MICRO_KIND, options);

		return bitmap;
		}

/**

* 根据视频在手机中的地址路径取得指定的视频缩略图

* @param cr

* @param fileName 本地视频地址

* @return 返回bitmap类型数据

*/

Java代码

1. public static Bitmap getVideoThumbnail(ContentResolver cr, Uri uri) {
2. Bitmap bitmap = null;
3. BitmapFactory.Options options = new BitmapFactory.Options();
4. options.inDither = false;
5. options.inPreferredConfig = Bitmap.Config.ARGB_8888;
6. Cursor cursor = cr.query(uri,new String[] { MediaStore.Video.Media._ID }, null, null, null);
8. if (cursor == null || cursor.getCount() == 0) {
9. return null;
10. }
11. cursor.moveToFirst();
12. String videoId = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media._ID)); //image id in image table.s
14. if (videoId == null) {
15. return null;
16. }
17. cursor.close();
18. long videoIdLong = Long.parseLong(videoId);
19. bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, videoIdLong,Images.Thumbnails.MICRO_KIND, options);
21. return bitmap;
22. }