我需要在画布上循环绘制一个圆圈,每次迭代之间都有延迟。所以,我意识到它是一个线程来使用Thread.sleep
延迟方法。
这是我的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();
}
这是我的处理程序:
private Handler drawHandler = new Handler() {
public void handleMessage (Message msg) {
canvas.drawCircle(x, y, f, paint);
}
};
无法编译此代码,因为无法在处理程序中解析画布。如何在处理程序中发送画布对象?通常,如何在处理程序中发送参数?