View展开隐藏动画

引用的布局

import com.slidingmenu.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Transformation;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class ExpandableLayout extends LinearLayout {

private Context mContext;
private LinearLayout mHandleView;
private LinearLayout mContentView;
private ImageView mIconExpand;
int mContentHeight = 0;
int mTitleHeight = 0;
private boolean isExpand;
private Animation animationDown;
private Animation animationUp;

public ExpandableLayout(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (this.mContentHeight == 0) {
this.mContentView.measure(widthMeasureSpec, 0);
this.mContentHeight = this.mContentView.getMeasuredHeight();
}
if (this.mTitleHeight == 0) {
this.mHandleView.measure(widthMeasureSpec, 0);
this.mTitleHeight = this.mHandleView.getMeasuredHeight();
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

@Override
protected void onFinishInflate() {
super.onFinishInflate();
this.mHandleView = (LinearLayout) this
.findViewById(R.id.ll);//点击展开的父类布局
this.mContentView = (LinearLayout) this.findViewById(R.id.ll_menu);//要展开的布局
this.mIconExpand = (ImageView) this.findViewById(R.id.image);//图片

this.mHandleView.setOnClickListener(new ExpandListener());//展开、隐藏监听
//this.mContentView.setOnClickListener(new ExpandListener());
mContentView.setVisibility(View.GONE);
}

private class ExpandListener implements View.OnClickListener {
@Override
public final void onClick(View paramView) {
//clearAnimation是view的方法
clearAnimation();
if (!isExpand) {
if (animationDown == null) {
animationDown = new DropDownAnim(mContentView,
mContentHeight, true);
animationDown.setDuration(200); // SUPPRESS CHECKSTYLE
}
startAnimation(animationDown);
mContentView.startAnimation(AnimationUtils.loadAnimation(
mContext, R.anim.animalpha));
mIconExpand.setImageResource(R.drawable.update_detail_up);
isExpand = true;
} else {
isExpand = false;
if (animationUp == null) {
animationUp = new DropDownAnim(mContentView,
mContentHeight, false);
animationUp.setDuration(200); // SUPPRESS CHECKSTYLE
}
startAnimation(animationUp);
mIconExpand.setImageResource(R.drawable.update_detail_down);
}
}
}

class DropDownAnim extends Animation {
/** 目标的高度 */
private int targetHeight;
/** 目标view */
private View view;
/** 是否向下展开 */
private boolean down;

/**
* 构造方法
*
* @param targetview
*            需要被展现的view
* @param vieweight
*            目的高
* @param isdown
*            true:向下展开，false:收起
*/
public DropDownAnim(View targetview, int vieweight, boolean isdown) {
this.view = targetview;
this.targetHeight = vieweight;
this.down = isdown;
}
//down的时候，interpolatedTime从0增长到1，这样newHeight也从0增长到targetHeight
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
int newHeight;
if (down) {
newHeight = (int) (targetHeight * interpolatedTime);
} else {
newHeight = (int) (targetHeight * (1 - interpolatedTime));
}
view.getLayoutParams().height = newHeight;
view.requestLayout();
if (view.getVisibility() == View.GONE) {
view.setVisibility(View.VISIBLE);
}
}

@Override
public void initialize(int width, int height, int parentWidth,
int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}

@Override
public boolean willChangeBounds() {
return true;
}
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:orientation="vertical" >

<view.ExpandableLayout
android:id="@+id/app_detail_safety_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/ll"
>
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="展开隐藏布局" />

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/image"
android:src="@drawable/update_detail_down"
/>
</LinearLayout>

<LinearLayout
android:id="@+id/ll_menu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp"
android:visibility="gone" >

<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="菜单1" />

<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="菜单2" />
</LinearLayout>

</view.ExpandableLayout>

<TextView
android:id="@+id/tv3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="布局1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="布局2" />

</LinearLayout>

<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="500"/>

最后显示隐藏布局的id不可重复监听，否则显示监听会无效