我只是想用计时器改变我绘制的圆圈的颜色。我在我的“onCreate
”方法中实现了以下代码:
Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
Drawing.switchColor();
}
});
}
},
1000,
1000);
switchColor()
方法执行以下操作:
public static void switchColor() {
Random r = new Random(30);
int random = r.nextInt();
if(random < 10) {
p.setColor(Color.GREEN);
}
else if(random >10 && random < 20) {
p.setColor(Color.BLUE);
}
else {
p.setColor(Color.RED);
}
}
当我运行它时,颜色保持默认。
有谁知道我是否必须在内部或不同的计时器模型中使用处理程序?
提前致谢!
最佳答案
我现在找到了一个合适的解决方案:
//-------------------Part 1 of AddCircleTimer------------------------
//Declare the timerAddCircle
timerAddCircle = new Timer();
timerAddCircle.schedule(new TimerTask() {
@Override
public void run() {
TimerMethodAddCircle();
}
}, 1000, 1000);
//-------------------Part 2 of AddCircleTimer------------------------
private void TimerMethodAddCircle()
{
//This method is called directly by the timer and runs in the same thread as the timer.
//We call the method that will work with the UI through the runOnUiThread method.
this.runOnUiThread(Timer_Add);
}
private Runnable Timer_Add = new Runnable() {
public void run() {
//This method runs in the same thread as the UI.
//Do something to the UI thread here
Drawing.addCircle();
d.invalidate();
}
};
//-------------------END Part 2 of AddCircleTimer------------------------
这工作得很好,我可以将它用于更多的计时器和不同的方法!
感谢大家!
关于java - 用计时器改变圆圈的颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32538611/