Android--启动拍照功能并返回结果

//拍照的方法
    private void openTakePhoto(){
        /**
         * 在启动拍照之前最好先判断一下sdcard是否可用
         */
        String state = Environment.getExternalStorageState();   //拿到sdcard是否可用的状态码
        if (state.equals(Environment.MEDIA_MOUNTED)){          //如果可用
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
            startActivityForResult(intent,TAKE_PHOTO);
        }else {
            Toast.makeText(SettingActivity.this,"sdcard不可用",Toast.LENGTH_SHORT).show();
        }
    }

  @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (data!= null) {
            switch (requestCode) {
                case TAKE_PHOTO:   //拍摄图片并选择
                    //两种方式  获取拍好的图片
                    if (data.getData() != null || data.getExtras() != null){  //防止没有返回结果
                        Uri uri = data.getData();
                        if (uri != null) {
                            photo = BitmapFactory.decodeFile(uri.getPath());   //拿到图片
                        }
                        if (photo == null) {
                            Bundle bundle = data.getExtras();
                            if (bundle != null) {
                                photo = (Bitmap) bundle.get("data");
                            } else {
                                Toast.makeText(getApplicationContext(), "找不到图片", Toast.LENGTH_SHORT).show();
                            }
                        }
                       //处理图片
                       //裁剪图片
                    }
                    break;