Android之图片滑动与显示

先在Transitions中插入ImageSwitcher

package com.example.Galleryphotoshow;

import com.example.Galleryphotoshow.R;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;

public   class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory
{

    private int[] resIds = new int[]
    { R.drawable.item1, R.drawable.item2, R.drawable.item3, R.drawable.item4,
      R.drawable.item5, R.drawable.item6, R.drawable.item7,
      R.drawable.item8, R.drawable.item9, R.drawable.item10,
      R.drawable.item11, R.drawable.item12, R.drawable.item13,
      R.drawable.item14, R.drawable.item15 };

    private Gallery gallery;
    private ImageSwitcher is;
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       gallery = (Gallery) findViewById(R.id.gallery1);
       is = (ImageSwitcher) findViewById(R.id.imageSwitcher1);  

       gallery.setAdapter(new ImageAdapter(this));
     //让选定的图片在中心显示
       gallery.setSelection(resIds.length/);
       //为Gallery绑定监听器；
       gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
           public void onItemSelected(AdapterView<?> parent, View view,
                   int position, long id) {
               //当在Gallery中选定一张图片是 ImageSwitcher同步显示同一张
               //position%images.length  为了让图片循环显示
               is.setImageResource(resIds[position%resIds.length]);  

           }
           public void onNothingSelected(AdapterView<?> parent) {  

           }
       });  

       is.setFactory(new ImageFactory(this));  

   }  

   private class ImageAdapter extends BaseAdapter{
       private Context context;
       public ImageAdapter(Context context) {
           this.context = context;
       }
       //可以return images.lenght(),在这里返回Integer.MAX_VALUE
       //是为了使图片循环显示
       public int getCount() {
           return Integer.MAX_VALUE;
       }
       public Object getItem(int position) {
           return null;
       }
       public long getItemId(int position) {
           return ;
       }
       public View getView(int position, View convertView, ViewGroup parent) {
           ImageView iv = new ImageView(context);
           iv.setImageResource(resIds[position%resIds.length]);
           iv.setLayoutParams(new Gallery.LayoutParams(,));
           iv.setAdjustViewBounds(true);
           return iv;
       }
   }  

   private class ImageFactory implements ViewFactory{
       private Context context;
       public ImageFactory(Context context){
           this.context = context;
       }
       public View makeView() {
           ImageView iv = new ImageView(context);
           iv.setLayoutParams(new ImageSwitcher.LayoutParams(,));
           return iv;
       }
   }

@Override
public View makeView() {
    // TODO Auto-generated method stub
    return null;
}

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub

}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub

}
}