android获取图片和视频的缩略图
2012-07-13 10:31
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获取图片缩略图:
Java代码
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,<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>
Java代码
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
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
public static Bitmap getVideoThumbnail(ContentResolver cr, Uri uri) {
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;
}
Java代码
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,<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
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
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
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;
}
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
public static Bitmap getVideoThumbnail(ContentResolver cr, Uri uri) {
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;
}
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