将位图从Java类返回到Activity

public class ImageProcessor {
    private OnBitmapProcessedListener listener;

    public void processImage() {
        // 生成或获取位图数据
        Bitmap bitmap = BitmapFactory.decodeFile("path/to/image.jpg");

        // 调用回调方法，将位图数据传递给Activity
        if (listener != null) {
            listener.onBitmapProcessed(bitmap);
        }
    }

    public void setOnBitmapProcessedListener(OnBitmapProcessedListener listener) {
        this.listener = listener;
    }

    public interface OnBitmapProcessedListener {
        void onBitmapProcessed(Bitmap bitmap);
    }
}

public class MainActivity extends AppCompatActivity implements ImageProcessor.OnBitmapProcessedListener {
    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = findViewById(R.id.imageView);

        ImageProcessor imageProcessor = new ImageProcessor();
        imageProcessor.setOnBitmapProcessedListener(this);
        imageProcessor.processImage();
    }

    @Override
    public void onBitmapProcessed(Bitmap bitmap) {
        // 处理位图数据，例如显示在ImageView中
        imageView.setImageBitmap(bitmap);
    }
}