在视图的画布上绘制动画线

Question

我只需绘制一条从画布的一个坐标移动到另一个坐标的线。我在绘制代码与时间同步方面遇到了麻烦。\

public class CustomMYChart extends View {

float x=0,y=0;
Canvas canvas;
Paint paint;

public CustomMYChart(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
    paint = new Paint();
    paint.setColor(Color.GREEN);        

}

@Override
protected void onDraw(final Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    this.canvas=canvas;

    for(int i=0; i<1000; i++){

        canvas.drawCircle(x, y, 5, paint);
        x+=1;
        y+=1;
        invalidate();
    }

}

}

Answer 1

只需删除onDraw中的for语句，只需一次迭代即可调用1000次invalidate（），然后将x和y移出屏幕。

  @Override
protected void onDraw(final Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    this.canvas=canvas;



        canvas.drawCircle(x, y, 5, paint);
        x+=1;
        y+=1;
        invalidate();
    }