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我有一个画布绘图，我将使用 onTouch 来更改绘图的颜色。这是一座房子，一旦触摸屏幕，它就会变成更暗的阴影。我只被告知我需要将方法调用移动到 dayTime 和 nightTime，可通过布尔值切换，并且必须在图像上相应地呈现文本白天和夜间时间。

下面是我用来绘制图像的代码。任何有关如何完成此操作的帮助将不胜感激：

/*
 * DrawView.java 
 */
public class DrawView extends View implements OnTouchListener
{

    private Paint backgroundPaint = new Paint();
    private Paint drawPaint_grass = new Paint();
    private Paint drawPaint_door = new Paint();
    private Paint drawPaint_house = new Paint();
    private Paint drawPaint_roof = new Paint();
    private Paint circlePaint = new Paint();
    private Paint circlePaint_sun = new Paint();
    private Paint textPaint = new Paint();
    private Paint path = new Paint();
    private Path trianglePath;
    private float sx, sy;

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

        setFocusable(true);
        setFocusableInTouchMode(true);

        backgroundPaint.setColor(Color.rgb(135,250,205));
        backgroundPaint.setAntiAlias(true);
        backgroundPaint.setStyle(Style.FILL);

        drawPaint_grass.setColor(Color.rgb(124, 252, 0));
        drawPaint_grass.setStyle(Style.FILL);

        drawPaint_door.setColor(Color.RED);
        drawPaint_door.setStyle(Style.FILL);

        //drawPaint_.setColor(Color.RED);
        //drawPaint_door.setStyle(Style.FILL);

        drawPaint_house.setColor(Color.rgb(205, 133, 63));
        drawPaint_house.setStyle(Style.FILL);

        drawPaint_roof.setColor(Color.rgb(160, 82, 45));
        drawPaint_roof.setStyle(Style.FILL);

        circlePaint_sun.setColor(Color.rgb(255, 255, 0));
        circlePaint_sun.setStyle(Style.FILL);

        trianglePath = new Path();
        trianglePath.moveTo(70, 300); // starting point
        trianglePath.lineTo(170,250); // 1st vertix
        trianglePath.lineTo(270, 300); // 2nd vertix
        trianglePath.lineTo(70, 300); // 3rd vertix and close
        //path.moveTo(getRight()/2, getLeft()/2, getTop()/2, getBottom()/2);
        textPaint.setColor(Color.BLACK);
        textPaint.setStyle(Style.FILL);
        //255, 255, 240
        circlePaint.setColor(Color.rgb(211, 211, 211));
        circlePaint.setStyle(Style.FILL);

        this.setOnTouchListener(this);
    }

    @Override
    public void onDraw(Canvas canvas)
    {

        //canvas.drawPath(path, paint);
        //canvas.drawPath(path, paint);

        // Draw white background
        canvas.drawRect(this.getLeft(), this.getTop(), this.getRight(), this.getBottom(), backgroundPaint);

        //draw a rectangle with blue paint
        canvas.drawRect(0,400, 540,600, drawPaint_grass); 
        canvas.drawRect(100,400, 240,300, drawPaint_house);
        canvas.drawRect(150,400, 190,335, drawPaint_door); 
        canvas.drawPath(trianglePath, drawPaint_roof); 

        //draw text with green paint
        canvas.drawText("Muhibur Rahim", 232, 565, textPaint);

        //draw a circle with red paint with the touch coordinates
        canvas.drawCircle(sx-30,sy-30, 3, circlePaint);

        canvas.drawCircle(80, 80, 30, circlePaint_sun);
    }

    public boolean onTouch(View v, MotionEvent event)
    {   
        //update the coordinates for the OnDraw method above, with wherever we touch
        sx = event.getX();
        sy = event.getY();

        invalidate();
        return true;
    }

}

我正在考虑将代码的着色部分（circlePaint_sun.setColor(Color.rgb(255, 255, 0)）放入私有Drawview（Context，Context）下的方法（例如static void dayTime（），然后分配两者方法值 0 和 1，并且在触摸或单击时（我认为 onclick 会更好）计数器增加并且值在 0 和 1 之间交替。但是我不确定如何在重复尝试后在代码中使用它，任何帮助是赞赏...

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1 回答 1

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将 a 添加private boolean dark = false;到您的变量中。

在您的onDraw方法中，添加类似

if (dark) backgroundPaint.setColor(Color.rgb(0,0,0));
else backgroundPaint.setColor(Color.rgb(255,255,255));

在绘制背景之前。

更改onTouch方法内的布尔值：

if (event.getAction() == MotionEvent.ACTION_DOWN) {
   dark = !dark;
   DrawView();
}
于 2013-02-20T20:55:24.423 回答