【Android开发】经典范例1-实现仿Windows7图片预览窗格效果

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本实例将显示类似于windows7提供的图片预览窗格效果，单击任意一张图片，可以在右侧显示该图片的预览效果。

效果如图所示：

具体实现方法：
res/layout/main.xml:

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="horizontal"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:id="@+id/layout1"    >    <GridView android:id="@+id/gridView1"      android:layout_height="match_parent"      android:layout_width="440px"      android:layout_marginTop="10px"      android:horizontalSpacing="3px"      android:verticalSpacing="3px"      android:numColumns="3"/>  <!-- 添加一个图像切换器 -->  <ImageSwitcher      android:id="@+id/imageSwitcher1"      android:padding="10px"      android:layout_width="match_parent"      android:layout_height="match_parent"/></LinearLayout>

MainActivity:

package com.example.test;    import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;  public class MainActivity extends Activity {  private int[] imageId=new int []{R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,R.drawable.img6,R.drawable.img7,R.drawable.img8,R.drawable.img9};private ImageSwitcher imageSwitcher;    @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);                 imageSwitcher=(ImageSwitcher)findViewById(R.id.imageSwitcher1);//获取图像切换器        //设置动画效果        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));//设置淡入动画        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));//设置淡出动画        imageSwitcher.setFactory(new ViewFactory() {@Overridepublic View makeView() {//实例化一个ImageView对象ImageView imageView=new ImageView(MainActivity.this);//设置保持纵横比居中缩放图像imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));return imageView;//返回imageView对象}});        imageSwitcher.setImageResource(R.drawable.img3);//设置默认显示的图像                        GridView gridview=(GridView)findViewById(R.id.gridView1);        BaseAdapter adapter=new BaseAdapter(){        @Overridepublic View getView(int position, View convertView, ViewGroup parent) {ImageView imageView = null;//声明一个ImageView对象if(convertView==null){imageView=new ImageView(MainActivity.this);//实例化ImageView对象/****************设置图像的宽度和高度*******************/imageView.setAdjustViewBounds(true);imageView.setMaxWidth(150);imageView.setMaxHeight(113);/*********************************************************/imageView.setPadding(5, 5, 5, 5);}else{imageView=(ImageView)convertView;}imageView.setImageResource(imageId[position]);return imageView;}                //功能:获得当前选项的id@Overridepublic long getItemId(int position) {return position;}//功能：获得当前选项@Overridepublic Object getItem(int position) {return position;}//获得数量@Overridepublic int getCount() {return imageId.length;}        };        gridview.setAdapter(adapter);        gridview.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {//显示选中的照片       imageSwitcher.setImageResource(imageId[position]);}});    }  }

运行效果与开头描述相同，成功实现。

转载请注明出处：http://blog.csdn.net/acmman/article/details/45041127

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