android中LayoutAnimationController类的使用

LayoutAnimationController位于包android.view.animation下，用于控制一个ViewGroup下所有的子iew的补间动画。可以对所有的子view调用同一个补间动画，但是可以控制不同的子view响应动画的延迟时间。

A layout animation controller is used to animated a layout's, or a view group's, children. Each child uses the same animation but for every one of them, the animation starts at a different time. A layout animation controller is used byViewGroupto compute the delay by which each child's animation start must be offset. The delay is computed by using characteristics of each child, like its index in the view group. This standard implementation computes the delay by multiplying a fixed amount of miliseconds by the index of the child in its parent view group. Subclasses are supposed to overridegetDelayForView(android.view.View)to implement a different way of computing the delay. For instance, aGridLayoutAnimationControllerwill compute the delay based on the column and row indices of the child in its parent view group. Information used to compute the animation delay of each child are stored in an instance ofLayoutAnimationController.AnimationParameters, itself stored in theViewGroup.LayoutParamsof the view.

需要注意到的一个方法是：

public voidsetDelay(float delay）

childanimationdelay=childindex*delay*animationduration

设置view的延迟时间，参数是一个比例，而不是延迟的时间，需要注意一下。

下面是一个简单的例子：

packagecom.app.layoutanimation;importandroid.app.Activity;importandroid.os.Bundle;importandroid.util.DisplayMetrics;importandroid.util.TypedValue;importandroid.view.View;importandroid.view.ViewGroup;importandroid.view.animation.Animation;importandroid.view.animation.BounceInterpolator;importandroid.view.animation.LayoutAnimationController;importandroid.view.animation.TranslateAnimation;importandroid.widget.Button;publicclassMainActivityextendsActivityimplementsView.OnClickListener{/***Calledwhentheactivityisfirstcreated.*/ViewGroupmContainer=null;ButtonmButton=null;privateintmViewChildHeight=60;privateLayoutAnimationControllerlayoutController=null;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);mContainer=(ViewGroup)this.findViewById(R.id.container);mButton=(Button)this.findViewById(R.id.btn);mButton.setOnClickListener(this);DisplayMetricsoutMetris=newDisplayMetrics();this.getWindowManager().getDefaultDisplay().getMetrics(outMetris);//设置view的弹出高度mViewChildHeight=(int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,mViewChildHeight,outMetris);android.util.Log.d("--tag","mViewChildHeight:"+mViewChildHeight);startCustomAnimation();}privatevoidstartCustomAnimation(){//设置位移动画TranslateAnimationmTranlateAnimation=newTranslateAnimation(Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,1.0f,Animation.RELATIVE_TO_SELF,0.0f);mTranlateAnimation.setDuration(1000);mTranlateAnimation.setInterpolator(newBounceInterpolator());//设置LayoutAnimationController的主要代码layoutController=newLayoutAnimationController(mTranlateAnimation);layoutController.setOrder(LayoutAnimationController.ORDER_NORMAL);layoutController.setDelay(0.2f);mContainer.setLayoutAnimation(layoutController);}@OverridepublicvoidonClick(Viewv){mContainer.startLayoutAnimation();}}

布局文件：

<?xmlversion="1.0"encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:background="#FFDEAD"><Buttonandroid:layout_width="wrap_content"android:layout_height="50dp"android:layout_centerInParent="true"android:text="animation"android:id="@+id/btn"/><LinearLayoutandroid:id="@+id/container"android:layout_width="match_parent"android:layout_height="80dp"android:layout_alignParentBottom="true"android:gravity="bottom"android:weightSum="4"><ImageViewandroid:layout_width="0dp"android:layout_height="60dp"android:layout_weight="1"android:layout_marginBottom="5dp"android:src="@drawable/amazon"/><ImageViewandroid:layout_width="0dp"android:layout_height="60dp"android:layout_weight="1"android:layout_marginBottom="5dp"android:src="@drawable/androids"/><ImageViewandroid:layout_width="0dp"android:layout_height="60dp"android:layout_weight="1"android:layout_marginBottom="5dp"android:src="@drawable/bee"/><ImageViewandroid:layout_width="0dp"android:layout_height="60dp"android:layout_weight="1"android:layout_marginBottom="5dp"android:src="@drawable/google"/></LinearLayout></RelativeLayout>

最后的执行结果：

public voidsetDelay(float delay）

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