Android实现GridView中ImageView动态变换的方法

本文实例讲述了android实现gridview中imageview动态变换的方法。分享给大家供大家参考。具体如下：

使用yy影音的时候，发现点击gridview的某一个item，item里面的图标会在按下的时候发生变换，变成另外一个图片。

自己写了一个类似的demo，具体步骤如下：

1、创建一个包含grid的acitity
2、创建item.xml 里面包含一个imageview和一个textview
3、自定义一个adapter，从baseadapter继承
4、在getview中为每个imageview添加setontouchlistener

代码入下：

mainactivity.java
package com.mygriddemo;
import java.util.arraylist;
import android.app.activity;
import android.content.context;
import android.content.intent;
import android.content.res.resources;
import android.graphics.drawable.drawable;
import android.os.bundle;
import android.util.log;
import android.view.layoutinflater;
import android.view.motionevent;
import android.view.view;
import android.view.view.ontouchlistener;
import android.view.viewgroup;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.baseadapter;
import android.widget.gridview;
import android.widget.imagebutton;
import android.widget.imageview;
import android.widget.textview;
import android.widget.toast;
public class mainactivity extends activity {
 /** called when the activity is first created. */
 private gridview gv;
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  gv = (gridview) findviewbyid(r.id.mygrid); 
  addadapter addadapter = new addadapter(this);
  gv.setadapter(addadapter);
 }
 public class addadapter extends baseadapter {
  private final layoutinflater minflater;
  private final arraylist<listitem> mitems = new arraylist<listitem>();
//  public static final int item_shortcut = 0;
//  public static final int item_appwidget = 1;
//  public static final int item_live_folder = 2;
//  public static final int item_wallpaper = 3;
  /**
   * specific item in our list.
   */
  public class listitem {
   public final charsequence text;
   public final drawable image;
   //public final int actiontag;
   public final drawable touchimage;
   //, int actiontag
   public listitem(resources res, int textresourceid, int imageresourceid,int touchimageresourceid) {
    text = res.getstring(textresourceid);
    if (imageresourceid != -1) {
     image = res.getdrawable(imageresourceid);
    } else {
     image = null;
    }
    if (touchimageresourceid != -1) {
     touchimage = res.getdrawable(touchimageresourceid);
    } else {
     touchimage = null;
    }
   }
  }
  public addadapter(mainactivity launcher) {
   super();
   minflater = (layoutinflater) launcher.getsystemservice(context.layout_inflater_service);
   // create default actions
   resources res = launcher.getresources();
   mitems.add(new listitem(res, r.string.item1,
     r.drawable.item1, r.drawable.item1back));
   mitems.add(new listitem(res, r.string.item2,
     r.drawable.item2, r.drawable.item2back));
   mitems.add(new listitem(res, r.string.item3,
     r.drawable.item3, r.drawable.item3back));
   mitems.add(new listitem(res, r.string.item4,
     r.drawable.item4, r.drawable.item4back));
  }
  public view getview(int position, view convertview, viewgroup parent) {
   final listitem item = (listitem) getitem(position);
   if (convertview == null) {
    convertview = minflater.inflate(r.layout.grid_item, parent, false);
   }
   final textview textview = (textview) convertview;//.findviewbyid(r.id.mygrid);
   textview.settag(item);
   textview.settext(item.text);
   textview.setcompounddrawableswithintrinsicbounds(null, item.image, null, null);
   textview.setontouchlistener(new ontouchlistener(){
    public boolean ontouch(view arg0, motionevent arg1) {
     // todo auto-generated method stub
     if (arg1.getaction() == motionevent.action_down){
      log.d("weatherwidget", motionevent.action_down+"");
      textview.setcompounddrawableswithintrinsicbounds(null, item.touchimage, null, null);
     }
     else if(arg1.getaction() == motionevent.action_up) {
      log.d("weatherwidget", arg1.getaction()+"");
      textview.setcompounddrawableswithintrinsicbounds(null, item.image, null, null);
      intent i = new intent(mainactivity.this,page1activity.class);
      startactivity(i);
     }
     return true;
    }
   });
   return convertview;
  }
  public int getcount() {
   return mitems.size();
  }
  public object getitem(int position) {
   return mitems.get(position);
  }
  public long getitemid(int position) {
   return position;
  }
 }
}

main.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
<gridview android:id="@+id/mygrid"
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:numcolumns="2" 
 android:verticalspacing="10dip"
 android:horizontalspacing="10dip"
 android:stretchmode="columnwidth"
 android:gravity="center"
>
</gridview>
</linearlayout>

griditem.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<textview xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:minheight="?android:attr/listpreferreditemheight"
 android:layout_centerhorizontal="true" 
 android:drawablepadding="14dip"
 android:paddingleft="15dip"
 android:paddingright="15dip"
 android:gravity="center_horizontal"
 />

希望本文所述对大家的android程序设计有所帮助。