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我需要在画布上循环绘制一个圆圈,并在每次迭代之间延迟。所以,我意识到这是使用Thread.sleep
方法延迟的一个线索。如何将canvas作为参数发送给处理程序?
这里是我onDraw
方法:
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
if (touching) {
paint.setStrokeWidth(STROKE_WIDTH);
paint.setColor(_color);
paint.setStyle(Paint.Style.FILL);
Thread background = new Thread(new Runnable() {
public void run() {
// TODO Auto-generated method stub
try {
while (f<=75){
Thread.sleep(100);
drawHandler.sendMessage(drawHandler.obtainMessage());
}
}
catch (InterruptedException e) {
// TODO: handle exception
Log.e("ERROR", "Thread Interrupted");
}
}
});
background.start();
}
这里是我的处理程序:
private Handler drawHandler = new Handler() {
public void handleMessage (Message msg) {
canvas.drawCircle(x, y, f, paint);
}
};
此代码不能编译,因为帆布不能在处理程序来解决。如何发送处理程序中的画布对象?一般来说,如何在处理程序中发送参数?