为了弄GridView中Item的放大缩小，弄了好久，，纠结了好久，也找了好多资料，终于弄出来了。
一、效果图如下：
二、GridView实现九宫格比较容易，难的是实现动画放大和放大后不会被后面的Item覆盖的问题，有人说用View.Bringtofornt()可以解决，不过我试了好久都不行，可能我的方法不对，有高手使用View.Bringtofornt()实现成功的可以交流一下。我用的是另一种方法：继承GridView，实现protected int getChildDrawingOrder(int childCount, int i)方法。代码如下：MyGridView.java
package com.src;import android.annotation.SuppressLint;import android.content.Context;import android.util.AttributeSet;import android.widget.GridView;public class MyGridView extends GridView {private int position = 0;public MyGridView(Context context) {super(context);}public MyGridView(Context context, AttributeSet attrs) {super(context, attrs);setChildrenDrawingOrderEnabled(true);}public void setCurrentPosition(int pos) {// 刷新adapter前，在activity中调用这句传入当前选中的item在屏幕中的次序this.position = pos;}@SuppressLint("NewApi")@Overrideprotected void setChildrenDrawingOrderEnabled(boolean enabled) {// TODO Auto-generated method stubsuper.setChildrenDrawingOrderEnabled(enabled);}@Overrideprotected int getChildDrawingOrder(int childCount, int i) {if (i == childCount – 1) {// 这是最后一个需要刷新的itemreturn position;}if (i == position) {// 这是原本要在最后一个刷新的itemreturn childCount – 1;}return i;// 正常次序的item}}三、然后在XML中使用重写的GridView定义控件：main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center_horizontal"android:orientation="vertical" ><LinearLayoutandroid:layout_width="600dip"android:layout_height="wrap_content"android:orientation="vertical" ><com.src.MyGridViewandroid:id="@+id/gridview"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#ffffff"android:focusable="true"android:gravity="center"android:horizontalSpacing="1.0dip"android:listSelector="@android:color/transparent"android:numColumns="5"android:stretchMode="spacingWidthUniform"android:unselectedAlpha="0.2"android:verticalSpacing="1.0dip" /></LinearLayout></LinearLayout>
四、然后重写适配器继承BaseAdapter：ImageAdapter.java
package com.src;import java.util.ArrayList;import java.util.HashMap;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.TextView;public class ImageAdapter extends BaseAdapter {private ArrayList<HashMap<String, String>> list = null;private int isSelect = -1;private int isClick = -1;private Context context;public ImageAdapter(Context context, ArrayList<HashMap<String, String>> list) {this.list = list;this.context = context;}public int getCount() {// TODO Auto-generated method stubreturn list.size();}public Object getItem(int position) {// TODO Auto-generated method stubreturn list.get(position);}public long getItemId(int position) {// TODO Auto-generated method stubreturn position;}public void setNotifyDataChange(int id) {isSelect = id;super.notifyDataSetChanged();}public void setNotifyItemSelected(int id) {isClick = id;super.notifyDataSetChanged();}public View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubViewHolder holder = new ViewHolder();if (convertView == null) {convertView = LayoutInflater.from(context).inflate(R.layout.gridview_item, null);holder.mImageView = (ImageView) convertView.findViewById(R.id.img);holder.mTextView = (TextView) convertView.findViewById(R.id.text);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}holder.mImageView.setImageResource(R.drawable.icon);String name = list.get(position).get("name");holder.mTextView.setText(name);convertView.setLayoutParams(new GridView.LayoutParams(150, 210));if (isClick == position) {holder.mImageView.setBackgroundResource(R.drawable.gvitemselect2);} else {if (isSelect == position) {holder.mImageView.setBackgroundResource(R.drawable.gvitemselect1);} else {holder.mImageView.setBackgroundResource(R.drawable.gvitemselect);}}return convertView;}class ViewHolder {public ImageView mImageView = null;public TextView mTextView = null;}}
五、在Activity中监听GridView事件实现放大缩小：GrideActivity.java
如果说对云南有进一步的了解的话就是鲜花。
