Android：为onActivityResult（）创建帮助程序类，并从另一个类调用它

Question

我需要创建一个不扩展Activity的辅助类。此代码用于根据RESULT从相机和图库加载。

我不了解如何使用上下文从其他类调用该类（因为它不扩展活动） 请你帮帮我吧？

下面是我需要提取的代码，并使用上下文在另一个类中调用它。

  enter code here
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.default_image);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        }

        if (requestCode == REQUEST_CAMERA && resultCode == RESULT_OK && null != data) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
            File destination = new File(Environment.getExternalStorageDirectory(),
                    System.currentTimeMillis() + ".jpg");
            Log.i(TAG, "destination= " + destination);
            FileOutputStream fo;
            try {
                destination.createNewFile();
                fo = new FileOutputStream(destination);
                fo.write(bytes.toByteArray());
                fo.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            img.setImageBitmap(thumbnail);
        }

我创建了一个名为ActivityResultHelper的新类，但遇到了findViewById的问题 活动结果助手

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.widget.ImageView;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 
 */
public class ActivityResultHelper{
    ImageView img;
    int RESULT_LOAD_IMAGE = 1;
    int REQUEST_CAMERA=2;
    int RESULT_OK=3;
    Context context;

    public ActivityResultHelper(Context _context){
        this.context = _context;
    }

    //@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        String TAG = ImageUtil.class.getSimpleName();

        //super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = context.getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

//            ImageView imageView = (ImageView)context.findViewById(R.id.default_image);
//            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        }

        if (requestCode == REQUEST_CAMERA && resultCode == RESULT_OK && null != data) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
            File destination = new File(Environment.getExternalStorageDirectory(),
                    System.currentTimeMillis() + ".jpg");
            Log.i(TAG, "destination= " + destination);
            FileOutputStream fo;
            try {
                destination.createNewFile();
                fo = new FileOutputStream(destination);
                fo.write(bytes.toByteArray());
                fo.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            img.setImageBitmap(thumbnail);
        }
    }
}