Android图片压缩（质量压缩和尺寸压缩）

import javaioByteArrayInputStream; import javaioByteArrayOutputStream; import javaioFile; import javaioFileNotFoundException; import javaioFileOutputStream; import javaioIOException;  import androidgraphicsBitmap; import androidgraphicsBitmapConfig; import androidgraphicsBitmapFactory;   public class ImageFactory {       public Bitmap getBitmap(String imgPath) {     // Get bitmap through image path     BitmapFactoryOptions newOpts = new BitmapFactoryOptions();     newOptsinJustDecodeBounds = false;     newOptsinPurgeable = true;     newOptsinInputShareable = true;     // Do not compress     newOptsinSampleSize = 1;     newOptsinPreferredConfig = ConfigRGB_565;     return BitmapFactorydecodeFile(imgPath, newOpts);   }         public void storeImage(Bitmap bitmap, String outPath) throws FileNotFoundException {     FileOutputStream os = new FileOutputStream(outPath);     bitmapcompress(BitmapCompressFormatJPEG, 100, os);   }         public Bitmap ratio(String imgPath, float pixelW, float pixelH) {     BitmapFactoryOptions newOpts = new BitmapFactoryOptions();      // 开始读入图片，此时把optionsinJustDecodeBounds 设回true，即只读边不读内容     newOptsinJustDecodeBounds = true;     newOptsinPreferredConfig = ConfigRGB_565;     // Get bitmap info, but notice that bitmap is null now      Bitmap bitmap = BitmapFactorydecodeFile(imgPath,newOpts);           newOptsinJustDecodeBounds = false;      int w = newOptsoutWidth;      int h = newOptsoutHeight;      // 想要缩放的目标尺寸     float hh = pixelH;// 设置高度为240f时，可以明显看到图片缩小了     float ww = pixelW;// 设置宽度为120f，可以明显看到图片缩小了     // 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可      int be = 1;//be=1表示不缩放      if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放        be = (int) (newOptsoutWidth / ww);      } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放        be = (int) (newOptsoutHeight / hh);      }      if (be <= 0) be = 1;      newOptsinSampleSize = be;//设置缩放比例     // 开始压缩图片，注意此时已经把optionsinJustDecodeBounds 设回false了     bitmap = BitmapFactorydecodeFile(imgPath, newOpts);     // 压缩好比例大小后再进行质量压缩 //    return compress(bitmap, maxSize); // 这里再进行质量压缩的意义不大，反而耗资源，删除     return bitmap;   }         public Bitmap ratio(Bitmap image, float pixelW, float pixelH) {     ByteArrayOutputStream os = new ByteArrayOutputStream();     imagecompress(BitmapCompressFormatJPEG, 100, os);     if( ostoByteArray()length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactorydecodeStream）时溢出         osreset();//重置baos即清空baos        imagecompress(BitmapCompressFormatJPEG, 50, os);//这里压缩50%，把压缩后的数据存放到baos中      }      ByteArrayInputStream is = new ByteArrayInputStream(ostoByteArray());      BitmapFactoryOptions newOpts = new BitmapFactoryOptions();      //开始读入图片，此时把optionsinJustDecodeBounds 设回true了      newOptsinJustDecodeBounds = true;     newOptsinPreferredConfig = ConfigRGB_565;     Bitmap bitmap = BitmapFactorydecodeStream(is, null, newOpts);      newOptsinJustDecodeBounds = false;      int w = newOptsoutWidth;      int h = newOptsoutHeight;      float hh = pixelH;// 设置高度为240f时，可以明显看到图片缩小了     float ww = pixelW;// 设置宽度为120f，可以明显看到图片缩小了     //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可      int be = 1;//be=1表示不缩放      if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放        be = (int) (newOptsoutWidth / ww);      } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放        be = (int) (newOptsoutHeight / hh);      }      if (be <= 0) be = 1;      newOptsinSampleSize = be;//设置缩放比例      //重新读入图片，注意此时已经把optionsinJustDecodeBounds 设回false了      is = new ByteArrayInputStream(ostoByteArray());      bitmap = BitmapFactorydecodeStream(is, null, newOpts);     //压缩好比例大小后再进行质量压缩 //   return compress(bitmap, maxSize); // 这里再进行质量压缩的意义不大，反而耗资源，删除     return bitmap;   }         public void compressAndGenImage(Bitmap image, String outPath, int maxSize) throws IOException {     ByteArrayOutputStream os = new ByteArrayOutputStream();     // scale     int options = 100;     // Store the bitmap into output stream(no compress)     imagecompress(BitmapCompressFormatJPEG, options, os);      // Compress by loop     while ( ostoByteArray()length / 1024 > maxSize) {       // Clean up os       osreset();       // interval 10       options -= 10;       imagecompress(BitmapCompressFormatJPEG, options, os);     }          // Generate compressed image file     FileOutputStream fos = new FileOutputStream(outPath);      foswrite(ostoByteArray());      fosflush();      fosclose();    }         public void compressAndGenImage(String imgPath, String outPath, int maxSize, boolean needsDelete) throws IOException {     compressAndGenImage(getBitmap(imgPath), outPath, maxSize);          // Delete original file     if (needsDelete) {       File file = new File (imgPath);       if (fileexists()) {         filedelete();       }     }   }         public void ratioAndGenThumb(Bitmap image, String outPath, float pixelW, float pixelH) throws FileNotFoundException {     Bitmap bitmap = ratio(image, pixelW, pixelH);     storeImage( bitmap, outPath);   }         public void ratioAndGenThumb(String imgPath, String outPath, float pixelW, float pixelH, boolean needsDelete) throws FileNotFoundException {     Bitmap bitmap = ratio(imgPath, pixelW, pixelH);     storeImage( bitmap, outPath);          // Delete original file         if (needsDelete) {           File file = new File (imgPath);           if (fileexists()) {             filedelete();           }         }   }    }