利用Property Animation(属性动画)使组件的背景色渐变
MainActivity如下:
package cc.testpropertyanimation;import android.os.Bundle;import android.view.View;import android.widget.RelativeLayout;import android.animation.AnimatorInflater;import android.animation.ArgbEvaluator;import android.animation.ObjectAnimator;import android.app.Activity;import android.content.Context;/** * Demo描述: * 利用Property Animation(属性动画)使组件的背景色渐变 * * 参考资料 * Android疯狂讲义(第二版) 作者李刚 * Thank you very much * */public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init(){RelativeLayout relativeLayout=(RelativeLayout) findViewById(R.id.relativeLayout);AnimationView animationView=new AnimationView(this);relativeLayout.addView(animationView);}public class AnimationView extends View{public AnimationView(Context context) {super(context); ObjectAnimator objectAnimator= (ObjectAnimator) AnimatorInflater.loadAnimator(MainActivity.this, R.animator.coloranimation); objectAnimator.setEvaluator(new ArgbEvaluator()); objectAnimator.setTarget(this); objectAnimator.start();}}}
coloranimation.xml如下:
<?xml version="1.0" encoding="utf-8"?><objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"android:propertyName="backgroundColor"android:duration="5000"android:valueFrom="#ff0033"android:valueTo="#000099"android:repeatCount="infinite"android:repeatMode="reverse"android:valueType="intType"></objectAnimator>
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/relativeLayout" android:layout_width="match_parent" android:layout_height="match_parent" ></RelativeLayout>