循环显示图像的Gallery组件

 

 

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewSwitcher.ViewFactory;
import android.widget.Gallery.LayoutParams; 
import com.uvchip.test.ImageAdapter;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity implements OnItemSelectedListener,
		ViewFactory {
	    private Gallery gallery;   
	    private ImageSwitcher imageSwitcher;   
	    private ImageAdapter imageAdapter;   
	    int[] resIds = { R.drawable.app, R.drawable.game,   
	              R.drawable.browser, R.drawable.life, R.drawable.music,   
	              R.drawable.photo,R.drawable.setting,R.drawable.video };  

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);  
		setContentView(R.layout.main_a);
		gallery = (Gallery) findViewById(R.id.gallery);   
        imageAdapter = new ImageAdapter(this);   
        gallery.setAdapter(imageAdapter);   
        gallery.setOnItemSelectedListener(this);  
        imageSwitcher = (ImageSwitcher) findViewById(R.id.imageswitcher);   
        // 设置ImageSwitcher组件的工厂对象   
        imageSwitcher.setFactory(this);   
        // 设置ImageSwitcher组件显示图像的动画效果   
       
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,   
                android.R.anim.fade_in)); 
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,   
                android.R.anim.fade_out));   
              
                gallery.setOnItemClickListener(new OnItemClickListener() {
        			public void onItemClick(AdapterView<?> parent, View view,
        					int position, long id) {
        				Toast.makeText(getApplicationContext(),
        						String.valueOf(id), Toast.LENGTH_SHORT).show();
        			}
        		});

	}

	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position,
			long id) {
		// 选中Gallery中某个图像时，在ImageSwitcher组件中放大显示该图像   
        imageSwitcher.setImageResource(resIds[position % resIds.length]);   

	}

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

	}
	// ImageSwitcher组件需要这个方法来创建一个View对象（一般为ImageView对象）   
    //  来显示图像 
	@Override
	public View makeView() {
		ImageView imageView = new ImageView(this);   
        imageView.setBackgroundColor(0xFF000000);   
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);   
        imageView.setLayoutParams(new ImageSwitcher.LayoutParams(   
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));   
        return imageView;  
	}

}

 

 

import com.uvchip.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter   
{   
	  int mGalleryItemBackground;   
      private Context mContext;   
      int[] resIds = { R.drawable.app, R.drawable.game,   
              R.drawable.browser, R.drawable.life, R.drawable.music,   
              R.drawable.photo,R.drawable.setting,R.drawable.video };  
      public ImageAdapter(Context context)   
      {   
          mContext = context;   
                  
      }   
      
	// 第1点改进，返回一个很大的值，例如，Integer.MAX_VALUE   
      public int getCount()   
      {   
          return Integer.MAX_VALUE;   
      }   

      public Object getItem(int position)   
      {   
          return position;   
      }   

      public long getItemId(int position)   
      {   
          return position;   
      }   
  
      public View getView(int position, View convertView, ViewGroup parent)   
      {   
          ImageView imageView = new ImageView(mContext);   
              // 第2点改进，通过取余来循环取得resIds数组中的图像资源ID   
          imageView.setImageResource(resIds[position % resIds.length]);   
          imageView.setScaleType(ImageView.ScaleType.FIT_XY);   
          imageView.setLayoutParams(new Gallery.LayoutParams(163, 106));   
          imageView.setBackgroundResource(mGalleryItemBackground);   
          return imageView;   
      }     
}  

 

 

 

<?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">   
    <Gallery android:id="@+id/gallery" android:layout_width="fill_parent"  
        android:layout_height="wrap_content" android:layout_marginTop="30dp" />   
    <ImageSwitcher android:id="@+id/imageswitcher"  
        android:layout_width="fill_parent" android:layout_height="wrap_content"  
        android:layout_marginTop="30dp" />   
</LinearLayout>