android 图片压缩

//对图片进行压缩   BitmapFactory.Options options = new BitmapFactory.Options();   options.inJustDecodeBounds = true;      //获取这个图片的宽和高   Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",options);//此时返回bm为空   options.inJustDecodeBounds =false;   //计算缩放比   int be = (int)(options.outHeight / (float)200);   if(be <= 0)    be =1;   options.inSampleSize =be;   //重新读入图片，注意这次要把options.inJustDecodeBounds设为false哦   bitmap = BitmapFactory.decodeFile("/sdcard/dcim/Camera/hello.jpg",options);   int w = bitmap.getWidth();   int h=bitmap.getHeight();   System.out.println(w+" "+h);   myImageView.setImageBitmap(bitmap);         //保存入sdCard   File file2= new File("/sdcard/dcim/Camera/test.jpg");   try {FileOutputStream out = new FileOutputStream(file2);if(bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out)){out.flush();out.close();}} catch (Exception e) {// TODO: handle exception}      //读取sd卡   File file =new File("/sdcard/dcim/Camera/test.jpg");   int maxBufferSize = 16 * 1024;int len = 0;ByteArrayOutputStream outStream = new ByteArrayOutputStream(); BufferedInputStream bufferedInputStream;try {bufferedInputStream = new BufferedInputStream(new FileInputStream(file));int bytesAvailable = bufferedInputStream.available();int bufferSize = Math.min(bytesAvailable, maxBufferSize);byte[] buffer = new byte[bufferSize];while ((len = bufferedInputStream.read(buffer)) != -1){outStream.write(buffer, 0, bufferSize);} data = outStream.toByteArray();outStream.close();bufferedInputStream.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}

最近做项目，碰到一个问题，就是上传大文件，会内存溢出，我只能压缩图片进行上传啦。这样我们就可以读取较大的图片而不会内存溢出了。

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