《android开发艺术探索》读书笔记（五）--动画

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.layoutanimation.MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#fff4f7f9"
        android:cacheColorHint="#00000000"
        android:divider="#dddbdb"
        android:dividerHeight="1.0px"
        android:layoutAnimation="@anim/anim_layout"
        android:listSelector="@android:color/transparent" />
</RelativeLayout>

ListView listView = (ListView) findViewById(R.id.list);
Animation animation = AnimationUtils.loadAnimation(this, R.anim.anim_item);
LayoutAnimationController controller = new LayoutAnimationController(animation);
controller.setDelay(0.5f);
controller.setOrder(LayoutAnimationController.ORDER_NORMAL);
listView.setLayoutAnimation(controller);

private void performAnimate(){
    ViewWrapper wrapper = new ViewWrapper(mButton);
    ObjectAnimator.ofInt(wrapper,"width"500).setDuration(5000).start();
}

@Override
public void onClick(View v){
    if(v == mButton){
        performAnimate();
    }
}

private static class ViewWrapper{
    private View mTarget;
    
    public ViewWrapper(View target){
        mTarget = target;
    }
    
    public void setWidth(int width){
        mTarget.getLayoutParams().width = width;
        mTarget.requestLayout();
    }
}