本文实例为大家分享了Android仿QQ可拉伸头部控件的具体实现代码，供大家参考，具体内容如下

该控件大致思路：

1.采用继承listview加入头部view。
2.监听listview滚动。
3.自定义动画回弹。

先看效果吧：

activity-main.xml布局如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="horizontal"
 tools:context=".MainActivity" >
 
 <com.example.headerlistview.HeaderListView
 android:id="@+id/header_lv"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:cacheColorHint="@android:color/transparent"
 android:divider="@android:color/darker_gray"
 android:dividerHeight="1dip"
 android:duplicateParentState="true"
 android:scrollbars="none" >
 </com.example.headerlistview.HeaderListView>
 
</LinearLayout>

headerview.xml布局：

<?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="wrap_content"
 android:orientation="vertical" >
 
 <ImageView
 android:id="@+id/header_image"
 android:layout_width="match_parent"
 android:layout_height="150dip"
 android:scaleType="centerCrop"
 android:src="@drawable/lifei987"
 />
 
</LinearLayout>

list_item布局：

<?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="80dip"
 android:gravity="center_vertical"
 android:orientation="horizontal" >
"
 
 <ImageView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src="@drawable/ic_launcher" />
 
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="80dip"
 android:layout_marginLeft="10dip"
 android:orientation="vertical" >
 
 <TextView
 android:id="@+id/tv_name"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginTop="10dip"
 android:text="lifei" />
 
 <TextView
 android:id="@+id/tv_describe"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginTop="10dip"
 android:text="lifeiasdfasdfasfsadfasf" />
 </LinearLayout>
 
</LinearLayout>

activity代码：

package com.example.headerlistview;
 
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
 
public class MainActivity extends Activity {
 
 private HeaderListView header_lv;
 
 private ImageView header_iv;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 getHeaderView();
 initView();
 }
 
 private void initView() {
 // TODO Auto-generated method stub
 header_lv=(HeaderListView) findViewById(R.id.header_lv);
 header_lv.addHeaderView(getHeaderView());
 header_lv.setHeaderView(header_iv);
 header_lv.setAdapter(getSimpleAdapter());
 }
 
 public BaseAdapter getSimpleAdapter(){
 List<Map<String,Object>> data=new ArrayList<Map<String,Object>>();
 for(int i=0;i<15;i++){
 Map<String,Object> map=new HashMap<String,Object>();
 map.put("name","郑州___"+i);
 map.put("describe","asdfasdfasdfasdfasdfsadfsad");
 data.add(map);
 }
 
 SimpleAdapter simpleAdapter=new SimpleAdapter(this,data,R.layout.list_item,new String[]{"name","describe"},new int[]{R.id.tv_name,R.id.tv_describe});
 return simpleAdapter;
 }
 
 public View getHeaderView(){
 View view= getLayoutInflater().inflate(R.layout.headerview,null);
 header_iv =(ImageView) view.findViewById(R.id.header_image);
 return view;
 }
 
}

自定义控件HeaderListView:

package com.example.headerlistview;
 
import java.security.spec.ECField;
 
import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.ImageView;
import android.widget.ListView;
 
public class HeaderListView extends ListView {
 
 private ImageView headerView;
 
 private int headerView_initHeight;//imageview初始高度
 
 public void setHeaderView(ImageView headerView) {
 this.headerView = headerView;
 }
 
 public HeaderListView(Context context) {
 super(context);
 // TODO Auto-generated constructor stub
 }
 
 public HeaderListView(Context context,AttributeSet attrs,int defStyle) {
 super(context,attrs,defStyle);
 // TODO Auto-generated constructor stub
 }
 
 public HeaderListView(Context context,AttributeSet attrs) {
 super(context,attrs);
 // TODO Auto-generated constructor stub
 }
 
 /**
 * listview焦点改变时--获取iamgeview高度的初始值，该值不能在构造方法中获取
 */
 @Override
 public void onWindowFocusChanged(boolean hasWindowFocus) {
 // TODO Auto-generated method stub
 super.onWindowFocusChanged(hasWindowFocus);
 if(hasWindowFocus){
 this.headerView_initHeight=headerView.getHeight();
 }
 }
 
 @SuppressLint("NewApi") @Override
 protected boolean overScrollBy(int deltaX,int deltaY,int scrollX,int scrollY,int scrollRangeX,int scrollRangeY,int maxOverScrollX,int maxOverScrollY,boolean isTouchEvent) {
 // 滑动过头的时候调用
 boolean bl=resizeHeaderView(deltaY);
 
 return bl?true:super.overScrollBy(deltaX,deltaY,scrollX,scrollY,scrollRangeX,scrollRangeY,maxOverScrollX,maxOverScrollY,isTouchEvent);
 }
 
 /**
 * 控制imageview高度的增加
 * @param deltaY 偏移量
 */
 private boolean resizeHeaderView(int deltaY) {
 if(Math.abs((double)deltaY)<200){
 if(deltaY<0){
 headerView.getLayoutParams().height=headerView.getHeight()-deltaY;
 //重新绘制
 headerView.requestLayout();
 }else{
 headerView.getLayoutParams().height=headerView.getHeight()-deltaY;
 headerView.requestLayout();
 }
 }
 
 return false;
 }
 
 @Override
 protected void onScrollChanged(int l,int t,int oldl,int oldt) {
 // TODO Auto-generated method stub
 super.onScrollChanged(l,t,oldl,oldt);
 //获取imageview父控件
 View parent=(View) headerView.getParent();
 //当父控件的top值小于零或者高度大于原始高度时触发
 if(parent.getTop()<0||headerView.getHeight()>headerView_initHeight){
 headerView.getLayoutParams().height=headerView.getHeight()+parent.getTop();
 parent.layout(parent.getLeft(),parent.getRight(),parent.getHeight());
 headerView.requestLayout();
 }
 }
 
 @Override
 public boolean onTouchEvent(MotionEvent ev) {
 // TODO Auto-generated method stub
 if(ev.getAction()==MotionEvent.ACTION_UP||ev.getAction()==MotionEvent.ACTION_CANCEL){
 MyAnimation animation=new MyAnimation(headerView,headerView_initHeight);
 animation.setDuration(200);
 headerView.startAnimation(animation);
 }
 return super.onTouchEvent(ev);
 }
 
 public class MyAnimation extends Animation{
 
 private ImageView header_iv;
 private int currentHeight;
 private int targetHeight;
 private int poorHeight;
 
 public MyAnimation(ImageView iv,int targetHeight){
 this.header_iv=iv;
 this.targetHeight=targetHeight;
 this.currentHeight=iv.getHeight();
 this.poorHeight=this.currentHeight-this.targetHeight;
 }
 
 /**
 * 动画执行期间执行该方法，不断执行
 * interpolatedTime：当前时间与duration的时间比（时间执行百分比）
 */
 @Override
 protected void applyTransformation(float interpolatedTime,Transformation t) {
 // TODO Auto-generated method stub
 super.applyTransformation(interpolatedTime,t);
 this.header_iv.getLayoutParams().height=(int)(currentHeight-poorHeight*interpolatedTime);
 this.header_iv.requestLayout();
 }
 }
 
}

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