转载于：https://www.cnblogs.com/Sharley/p/7942142.html

  private static File mPhotoFile = null;
    public static void setPhotoFile(File photoFile){
        mPhotoFile = photoFile;
    }

    public static File getPhotoFile(){

        return mPhotoFile;
    }


    /**
     * 保存图片到图库
     * @param bmp
     */
    public static void saveImageToGallery(Bitmap bmp,String bitName ) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(),
                "yingtan");
        if (!appDir.exists()) {
            appDir.mkdir();
        }

        String fileName = bitName + ".jpg";
        File file = new File(appDir, fileName);

        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        setPhotoFile(file);
    }

    /**
     * @param bmp 获取的bitmap数据
     * @param picName 自定义的图片名
     */
    public static void saveBmp2Gallery(Context context,Bitmap bmp, String picName) {
        saveImageToGallery(bmp,picName);
        String fileName = null;
        //系统相册目录
        String galleryPath = Environment.getExternalStorageDirectory()
                + File.separator + Environment.DIRECTORY_DCIM
                + File.separator + "Camera" + File.separator;


        // 声明文件对象
        File file = null;
        // 声明输出流
        FileOutputStream outStream = null;
        try {
            // 如果有目标文件，直接获得文件对象，否则创建一个以filename为名称的文件
            file = new File(galleryPath, picName + ".jpg");
            // 获得文件相对路径
            fileName = file.toString();
            // 获得输出流，如果文件中有内容，追加内容
            outStream = new FileOutputStream(fileName);
            if (null != outStream) {
                bmp.compress(Bitmap.CompressFormat.JPEG, 90, outStream);
            }
        }catch (Exception e) {
            e.getStackTrace();
        } finally {
            try {
                if (outStream != null) {
                    outStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        MediaStore.Images.Media.insertImage(context.getContentResolver(),bmp,fileName,null);
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        context.sendBroadcast(intent);

        ToastUtils.showToast(context,"图片保存成功");

    }

更新

• 直接保存到系统相册，这个时候只会有一张图片

    /*
     * 保存文件，文件名为当前日期
     */
    public void saveBitmap(Bitmap bitmap, String bitName) {
        Log.d(TAG,"Build.BRAND============"+Build.BRAND);
        String fileName;
        File file;
        if (Build.BRAND.equals("xiaomi")) { // 小米手机
            fileName = Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/" + bitName;
        }else if (Build.BRAND.equals("Huawei")){
            fileName = Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/" + bitName;
        } else {  // Meizu 、Oppo
            fileName = Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + bitName;
        }
        file = new File(fileName);

        if (file.exists()) {
            file.delete();
        }
        FileOutputStream out;
        try {
            out = new FileOutputStream(file);
            // 格式为 JPEG，照相机拍出的图片为JPEG格式的，PNG格式的不能显示在相册中
            if (bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out)) {
                out.flush();
                out.close();
// 插入图库
                MediaStore.Images.Media.insertImage(this.getContentResolver(), file.getAbsolutePath(), bitName, null);

            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();

        }
        // 发送广播，通知刷新图库的显示
        this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + fileName)));

    }

• 保存到自定义路径，然后再刷新到系统相册，这个时候会有两张图片

    public static void saveImageToGallery(Context context, Bitmap bmp) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "QrCode");
        if (!appDir.exists()) {

            appDir.mkdir();
        }

        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {

            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {

            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }

        // 其次把文件插入到系统图库
        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
                    file.getAbsolutePath(), fileName, null);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // 判断SDK版本是不是4.4或者高于4.4
            String[] paths = new String[]{file.getAbsolutePath()};
            MediaScannerConnection.scanFile(context, paths, null, null);
        } else {
            final Intent intent;
            if (file.isDirectory()) {
                intent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
                intent.setClassName("com.android.providers.media", "com.android.providers.media.MediaScannerReceiver");
                intent.setData(Uri.fromFile(Environment.getExternalStorageDirectory()));
            } else {
                intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                intent.setData(Uri.fromFile(file));
            }
            context.sendBroadcast(intent);
        }

    }