我正在学习如何使用ObjectAnimator在android上动画,但是我没有看到它更新了我的setter方法。假设我有一个在显示屏上绘制一个简单的文本,并有私有变量(curnum)的客户视图,一个objectAnimator将操作:为什么objectAnimator不调用setter方法
public class TempView extends View {
private Float cur_num = new Float(0.0);
private float curnum = 0f;
public TempView(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public void setCurnum()
{
curnum++;
cur_num = new Float(curnum);
invalidate();
}
@Override
public void onDraw(Canvas canvas)
{
Paint paint = new Paint();
paint.setStrokeWidth(8);
paint.setTextSize(100);
canvas.drawText(cur_num.toString(), 150, 150, paint);
}
}
现在我的活动课,我有启动的动作栏项目动画:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.startanim) {
TempView v = (TempView)findViewById(R.id.tempView);
ObjectAnimator anim = ObjectAnimator.ofFloat(v, "curnum", 0f, 1f);
anim.setDuration(1000L);
anim.start();
}
return super.onOptionsItemSelected(item);
}
但不知何故,如果我在setter方法上放置断点,它永远不会被击中。
我错过了什么吗?
setCurnum()应该是setCurnum (浮点值)? – pskink
** invalidate()** setter函数内部是绝对必要的,以便动画运行。 – Odaym