如果调用系统剪裁功能

首先调用系统图库，获取图片，然后对该图片进行剪裁，大家帮忙看下我的代码哪里有问题
Uri uri = data.getData();
                                Cursor cursor = getContentResolver().query(uri, null, null,
                                                null, null);
                                cursor.moveToFirst();
                                String filename = cursor.getString(1);
                                tempFile = new File(filename);
                                long size = cursor.getLong(2);
                                java.lang.System.out.println("the length 0:" + size);
                                Intent intent = new Intent("com.android.camera.CropImage");
                                intent.setType("image/*");
                                intent.setData(data.getData());
                                intent.putExtra("crop", "true");// crop=true 有这句才能出来最后的裁剪页面.
                                intent.putExtra("aspectX", 1);// 这两项为裁剪框的比例.
                                intent.putExtra("aspectY", 2);// x:y=1:2
                                intent.putExtra("output", Uri.fromFile(tempFile));
                                intent.putExtra("return-data", true);   
                                startActivityForResult(intent, OPEN_CROP);