Question

如何删除android中的位图？我已经创建了一个名为“sun”的位图，但是一旦我完成了一个人走过屏幕，我想添加一个名为“月亮”的新位图，但它只是在太阳顶部创建，我怎么能删除太阳位图？这是我行走的人的代码。

    switch (counter)
    {

    case 0:
        skyRect.set(0, 0, canvas.getWidth(), 400);
        canvas.drawRect(skyRect, sky);
        canvas.drawBitmap(AndroidDude, changingX, (canvas.getHeight()/2 - (AndroidDude.getHeight()/2)), null);
        if (changingX < canvas.getWidth())
        {
            changingX += 10;
        }
        else 
        {
            changingX = 0;
            sunChangingX = 0;
            counter++;
        }

        grassRect.set(0, 400, canvas.getWidth(), canvas.getHeight());
        canvas.drawRect(grassRect, grass);
        canvas.drawBitmap(cloud, 100, 50, null);
        canvas.drawBitmap(cloud, 700, 100, null);
        canvas.drawBitmap(sun, (canvas.getWidth() - sun.getWidth()), 0, null);
        invalidate();
        break;

    case 1:
        //Remove sun and clouds here?
        canvas.drawBitmap(moon, (canvas.getWidth() - moon.getWidth()), 0, null);
        canvas.drawBitmap(AndroidDude, changingX, (canvas.getHeight()/2 - (AndroidDude.getHeight()/2)), null);
        if (changingX < canvas.getWidth())
        {
            changingX += 10;
        }
        else 
        {
            changingX = 0;
            counter++;
        }
        grassRect.set(0, 400, canvas.getWidth(), canvas.getHeight());
        canvas.drawRect(grassRect, grass);
        canvas.drawBitmap(cloud, 100, 50, null);
        canvas.drawBitmap(cloud, 700, 100, null);
        canvas.drawBitmap(sun, sunChangingX, 0, null);
        invalidate();
        break;
    }

Answer 1

在要删除的位图上重绘背景（天空和草地）。刷新功能。

Answer 2

你只是在旧的东西上画新东西。如果你需要“擦除”某些东西，你只需重新绘制背景。

Answer 3

Canvas.drawColor(Color.WHITE);

或

你可以这样清理画布你可以用 WHITE 颜色绘制矩形。

//或任何画布颜色

看起来画布是空白的。

再次画出你想要的东西。

您的输出将以白色显示。

删除android中的位图

3 个答案: