Android本地图片压缩+转base64

 // 根据路径获得图片并压缩，返回bitmap用于显示    private static Bitmap getSmallBitmap(String filePath) {        final BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeFile(filePath, options);        // Calculate inSampleSize        options.inSampleSize = calculateInSampleSize(options, 480, 800);        // Decode bitmap with inSampleSize set        options.inJustDecodeBounds = false;        return BitmapFactory.decodeFile(filePath, options);    }    //计算图片的缩放值    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {        final int height = options.outHeight;        final int width = options.outWidth;        int inSampleSize = 1;        if (height > reqHeight || width > reqWidth) {            final int heightRatio = Math.round((float) height / (float) reqHeight);            final int widthRatio = Math.round((float) width / (float) reqWidth);            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;        }        return inSampleSize;    }    //把bitmap转换成String    public static String bitmapToString(String filePath) {        Bitmap bm = getSmallBitmap(filePath);        ByteArrayOutputStream baos = new ByteArrayOutputStream();        //1.5M的压缩后在100Kb以内，测试得值,压缩后的大小=94486字节,压缩后的大小=74473字节        //这里的JPEG 如果换成PNG，那么压缩的就有600kB这样        bm.compress(Bitmap.CompressFormat.JPEG, 40, baos);        byte[] b = baos.toByteArray();        Log.d("d", "压缩后的大小=" + b.length);        return "data:img/jpg;base64," + Base64.encodeToString(b, Base64.DEFAULT);    }

调用

String base64str = bitmapToString(path);//path 图片路径

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