图片压缩

1. //对图片进行压缩
2. BitmapFactory.Optionsoptions=newBitmapFactory.Options();
3. options.inJustDecodeBounds=true;
5. //获取这个图片的宽和高
6. Bitmapbitmap=BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",options);//此时返回bm为空
7. options.inJustDecodeBounds=false;
8. //计算缩放比
9. intbe=(int)(options.outHeight/(float)200);
10. if(be<=0)
11. be=1;
12. options.inSampleSize=be;
13. //重新读入图片，注意这次要把options.inJustDecodeBounds设为false哦
14. bitmap=BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",options);
15. intw=bitmap.getWidth();
16. inth=bitmap.getHeight();
17. System.out.println(w+""+h);
18. myImageView.setImageBitmap(bitmap);
21. //保存入sdCard
22. Filefile2=newFile("/sdcard/dcim/Camera/test.jpg");
23. try{
24. FileOutputStreamout=newFileOutputStream(file2);
25. if(bitmap.compress(Bitmap.CompressFormat.JPEG,100,out)){
26. out.flush();
27. out.close();
28. }
29. }catch(Exceptione){
30. //TODO:handleexception
31. }
34. //读取sd卡
35. Filefile=newFile("/sdcard/dcim/Camera/test.jpg");
36. intmaxBufferSize=16*1024;
38. intlen=0;
39. ByteArrayOutputStreamoutStream=newByteArrayOutputStream();
40. BufferedInputStreambufferedInputStream;
41. try{
42. bufferedInputStream=newBufferedInputStream(newFileInputStream(file));
43. intbytesAvailable=bufferedInputStream.available();
44. intbufferSize=Math.min(bytesAvailable,maxBufferSize);
45. byte[]buffer=newbyte[bufferSize];
46. while((len=bufferedInputStream.read(buffer))!=-1)
47. {
48. outStream.write(buffer,0,bufferSize);
49. }
50. data=outStream.toByteArray();
51. outStream.close();
52. bufferedInputStream.close();
54. }catch(FileNotFoundExceptione){
55. e.printStackTrace();
56. }catch(IOExceptione){
57. e.printStackTrace();
58. }