BYR Achieve · 镜像论坛

[问题]ObjectAnimator.ofObject如何正确使用？

2015/9/25镜像同步6 回复

ViewGroup.LayoutParams marginLayoutParams1 = new ViewGroup.LayoutParams(10, 20); ViewGroup.LayoutParams marginLayoutParams2 = new ViewGroup.LayoutParams(400, 800); ObjectAnimator objectAnimator = ObjectAnimator.ofObject(mImageViewTest, "layoutparams", new MarginEvaluator(), marginLayoutParams1, marginLayoutParams2); objectAnimator.setDuration(2000); objectAnimator.addUpdateListener((animation -> { mImageViewTest.invalidate(); })); objectAnimator.start(); …… …… …… public class MarginEvaluator implements TypeEvaluator { public Object evaluate(float fraction, Object startValue, Object endValue) { float h = ((ViewGroup.LayoutParams) startValue).height + fraction * (((ViewGroup.LayoutParams) endValue).height - ((ViewGroup.LayoutParams) startValue).height); float w = ((ViewGroup.LayoutParams) startValue).width + fraction * (((ViewGroup.LayoutParams) endValue).width - ((ViewGroup.LayoutParams) startValue).width); // Log.i("fraction", "" + fraction); // Log.i("h", "" + (int) h); // Log.i("w", "" + (int) w); return new ViewGroup.LayoutParams((int) w, (int) h); } } log有个异常： W/PropertyValuesHolder﹕ Method setLayoutparams() with type class android.view.ViewGroup$LayoutParams not found on target class class android.widget.ImageView 因为ImageView是放在LinearLayout里面的，所以试着把代码中的ViewGroup.LayoutParams改成LinearLayout.LayoutParams，但还是不行，也有一个类似的异常： W/PropertyValuesHolder﹕ Method setLayoutparams() with type class android.widget.LinearLayout$LayoutParams not found on target class class android.widget.ImageView 很奇怪，如果直接使用 mImageViewTest.setLayoutParams(new LinearLayout.LayoutParams(400,800)); 是可以改变imageview大小的。然后就不知道是哪出问题了～特来请教一下～

订阅后，新回复会通过你的通知中心匿名送达。