Android 压缩图片到指定尺寸 并压缩

压缩到指定尺寸：

public static Bitmap small(Bitmap bitmap) {
        Bitmap resizeBmp = null;
        //设置长宽压缩比例进行压缩
        //Matrix matrix = new Matrix();
        //matrix.postScale(0.36f,0.36f);  //长和宽放大缩小的比例
        //Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);


        //压缩到指定尺寸
        if (bitmap.getHeight() > bitmap.getWidth()) {
            resizeBmp = Bitmap.createScaledBitmap(bitmap, 1080, 1440, true);
        } else {
            resizeBmp = Bitmap.createScaledBitmap(bitmap, 1440, 1080, true);
        }
        return resizeBmp;
    }
           

压缩图片质量：

public static File compress(Context context, Bitmap bmp2) {
        Bitmap bmp = bmp2;
        String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "pic";
        File appDir = new File(storePath);
        if (!appDir.exists()) {
            appDir.mkdir();
        }

        //图片随机命名（时间戳+随机数）
        String fileName = System.currentTimeMillis() +random_23()+ ".jpg";
        File file = new File(appDir, fileName);

        //addIgnore(图片文件夹地址)  操作：新建文件.nomedia    作用：该文件所在的文件夹里的图片不在系统相册里显示
        addIgnore(storePath);

        try {
            FileOutputStream fos = new FileOutputStream(file);
            //通过io流的方式来压缩保存图片
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 92, baos);
            byte[] bytes = baos.toByteArray();
            fos.write(bytes);
            fos.flush();
            fos.close();

            //把文件插入到系统图库
            //MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null);

            //保存图片后发送广播通知更新数据库
            Uri uri = Uri.fromFile(file);
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
            if (isSuccess) {
                return file;
            } else {
                return file;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return file;
    }






 private static void addIgnore(String filePath) {
        File file = new File(filePath);
        if (!file.exists()) {
            file.mkdirs();
        }

        File ignoreFile = new File(filePath + "/.nomedia");
        if (ignoreFile.exists() && ignoreFile.isFile()) {
            return;
        }

        try {
            ignoreFile.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }



//随机数
 public static String random_23() {
        String ran="";
        Random r = new Random();
        for (int i = 0; i < 22; i++)
        {
            int ran1 = r.nextInt(9);
            ran=ran+ran1;
        }
        return ran;
    }
           

注意bitmap的回收