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. }  

最后

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