如何水平滑动位图（对象）？

Question

我在电话屏幕的底部中间编写了一个简单的Bitmap。我想向其添加滑动手势。例如。如果您向左滑动，则Bitmap的位置应向左更改2厘米，与右侧相同。

那基本上就是我的GameView：

package com.example.neueapp;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.View;
import android.widget.Toast;

public class FlyingFishView extends View {

    public Bitmap fish;
    private Bitmap backgroundImage;

    public FlyingFishView(Context context) {
        super(context);

        backgroundImage = BitmapFactory.decodeResource(getResources(), R.drawable.background);
        fish = BitmapFactory.decodeResource(getResources(), R.drawable.fish1);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.drawBitmap(backgroundImage, 0, 0, null);
        canvas.drawBitmap(fish, 450, 1400, null);

    }
}