安卓app_sl4_16实现仿Windows 7图片预览窗格效果

//实现仿Windows 7图片预览窗格效果
//GridView网格视图

package com.example.sl4_16;
//实现仿Windows 7图片预览窗格效果
//GridView网格视图
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
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.LinearLayout.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity {
    private int[] imageId=new int[]{R.drawable.img01,
            R.drawable.img02,
            R.drawable.img03,
            R.drawable.img04,
            R.drawable.img05,
            R.drawable.img06,
            R.drawable.img07,
            R.drawable.img08,
            R.drawable.img09,
            R.drawable.img10,
            R.drawable.img11,
            R.drawable.img12};
    private ImageSwitcher imageSwitcher;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageSwitcher=(ImageSwitcher) findViewById(R.id.imageSwitcher1);
        //设置动画效果
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
        imageSwitcher.setFactory(new ViewFactory(){

            @Override
            public View makeView() {
                // TODO Auto-generated method stub
                ImageView imageView = new ImageView(MainActivity.this);
                imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);//保持纵横比居中缩放图像
                imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
                return imageView;
            }
            
        });
        imageSwitcher.setImageResource(imageId[6]);//by txwtech
        GridView gridview = (GridView) findViewById(R.id.gridView1);
        //创建BaseAdapter类的对象，并重写其中的getView()、getItemId()、getItem()和getCount()方法，其中最主要的是重写getView()方法来设置显示图片的格式，
        BaseAdapter adapter1=new BaseAdapter()
        {

            @Override
            public int getCount() {
                // TODO Auto-generated method stub
                //return 0;
                return imageId.length;
            }

            @Override
            public Object getItem(int position) {
                // TODO Auto-generated method stub
                //return null;
                return position;
            }

            @Override
            public long getItemId(int position) {
                // TODO Auto-generated method stub
                //return 0;
                return position;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) 
            {
                // TODO Auto-generated method stub
                ImageView imageview;//声明ImageView的对象
                if(convertView == null)
                {
                    imageview= new ImageView(MainActivity.this);
                    //设置图像的宽度和高度
                    imageview.setAdjustViewBounds(true);
                    imageview.setMaxWidth(152);
                    imageview.setMaxHeight(116);
                    //设置内边距
                    imageview.setPadding(5, 5, 5, 5);
                }
                else
                {
                    imageview=(ImageView)convertView;
                }
                imageview.setImageResource(imageId[position]);
                return imageview;
            }
            
        };
        gridview.setAdapter(adapter1);
        gridview.setOnItemClickListener(new OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // TODO Auto-generated method stub
                imageSwitcher.setImageResource(imageId[position]);
                
            }
            
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

<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="vertical"
   
    tools:context="com.example.sl4_16.MainActivity" >

    <GridView
        android:id="@+id/gridView1"
        android:layout_width="match_parent"
        android:layout_height="318dp"
        android:numColumns="3" >
    </GridView>

    <ImageSwitcher
        android:id="@+id/imageSwitcher1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </ImageSwitcher>

</LinearLayout>