Android 图片压缩

    /**
     * 压缩图片
     * @param inFile 输入文件 到文件
     * @param outFile 输出目录 到目录
     */
    private void compressImage(String inFile,String outFile){
        int limt = 400;//最大宽高限制
        String[] splitIn = inFile.split(File.separator);
        String[] splitinFile = splitIn[splitIn.length-1].split("\\.");
        String fileName = splitinFile[splitinFile.length-2];
        String fileFormat = splitinFile[splitinFile.length-1];
        Bitmap inBitmap = getBitmap(inFile, inFile.endsWith("png"));
        int height = inBitmap.getHeight();
        int width = inBitmap.getWidth();
        boolean isNeedCompress = Math.max(height, width) > limt;
        if(isNeedCompress){
            //压缩
            float ration = (float)limt / Math.max(height, width);
            Bitmap outBitmap = zoomImg(inBitmap, ration);
            inBitmap.recycle();
            inBitmap = null;
            System.gc();
            String outImage = saveBitmap(outBitmap, outFile + fileName + "." + fileFormat, inFile.endsWith("png"));
            Log.e(TAG, "compressImage: "+outImage );
        }else{
            //输出保存
            String outImage = saveBitmap(inBitmap, outFile + fileName + "." + fileFormat, inFile.endsWith("png"));
            Log.e(TAG, "compressImage: "+outImage );
        }
    }


    /**
     * 获得Bitmap
     * @param imgPath
     * @param isPng
     * @return
     */
    public Bitmap getBitmap(String imgPath,boolean isPng) {
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        newOpts.inJustDecodeBounds = false;
        newOpts.inPurgeable = true;
        newOpts.inInputShareable = true;
        newOpts.inSampleSize = 1;
        newOpts.inPreferredConfig = isPng ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
        return BitmapFactory.decodeFile(imgPath, newOpts);
    }

    /**
     * 压缩Bitmap
     * @param bm
     * @param f
     * @return
     */
    public Bitmap zoomImg(Bitmap bm, float f) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        float scaleWidth = f;
        float scaleHeight = f;
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
        return newbm;
    }

    /**
     * 保存Bitmap
     * @param bm
     * @param savePath
     * @param isPng
     * @return
     */
    public String saveBitmap(Bitmap bm, String savePath,boolean isPng) {
        Log.e(TAG, "saveBitmap: ispng"+ isPng );
        File f = new File(savePath);
        if (f.exists()) {
            f.delete();
        }
        try {
            FileOutputStream out = new FileOutputStream(f);
            bm.compress(isPng ? Bitmap.CompressFormat.PNG : Bitmap.CompressFormat.JPEG, 90, out);
            out.flush();
            out.close();
            bm.recycle();
            bm = null;
            System.gc();
            return savePath;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }