android开发

开发平台：
Java

EX05_13.java：源码内容
							package irdc.ex05_13;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
public class EX05_13 extends Activity
{
  protected static InputStream is;
  private ImageAdapter mImageAdapter01;
  
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) 
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
      
    /*设置图档*/
    Integer[] myImageIds = 
    {
      R.drawable.google,
      R.drawable.helloking,
      R.drawable.chamberlain,
      R.drawable.king,
      R.drawable.with,
    };
    
    mImageAdapter01 = new ImageAdapter(EX05_13.this, myImageIds);
    
    /*设置图为Gallery的显示方式*/
    Gallery g = (Gallery) findViewById(R.id.mygallery);
    g.setAdapter(mImageAdapter01);
    
    g.setOnItemClickListener(new Gallery.OnItemClickListener()
    {
      @Override
      public void onItemClick
      (AdapterView<?> parent, View v, final int position, long id)
      {
        // TODO Auto-generated method stub 
        new AlertDialog.Builder(EX05_13.this)
        .setTitle(R.string.app_about)
        /*设置弹出窗口的图式*/
        .setIcon(mImageAdapter01.myImageIds[position]) 
        /*设置弹出窗口的信息*/
        .setMessage(R.string.app_about_msg)
        /*确认窗口*/
        .setPositiveButton(R.string.str_ok,
        new DialogInterface.OnClickListener()
        {
          public void onClick(
          DialogInterface dialoginterface, int i)
          {           
            Resources resources = getBaseContext().getResources();
            is = resources.openRawResource
            (mImageAdapter01.myImageIds[position]);
            try
            {
              /*更换桌面*/
              setWallpaper(is);
              /*用Toast来显示桌面已更换*/
              Toast.makeText
              (
                EX05_13.this,
                getString(R.string.my_gallery_text_pre),
                Toast.LENGTH_SHORT
              ).show();
            }
            catch (Exception e)
            {            
              e.printStackTrace();
            };
          }
        }).setNegativeButton
        (R.string.str_no, new DialogInterface.OnClickListener()
        {
          /*设置跳出窗口的返回事件*/
          public void onClick(DialogInterface dialoginterface, int i)   
          {
            /*用Toast来显示桌面已取消*/
            Toast.makeText
            (
              EX05_13.this,
              getString(R.string.my_gallery_text_no),
              Toast.LENGTH_SHORT
            ).show();  
          }
        }).show(); 
      }
    });
  }
  
  public class ImageAdapter extends BaseAdapter
  {
    int mGalleryItemBackground;
    private Context mContext;
    private Integer[] myImageIds;
    
    public ImageAdapter(Context c, Integer[] aid)
    {
      mContext = c;
      myImageIds = aid;
      TypedArray a = obtainStyledAttributes(R.styleable.Gallery);
      mGalleryItemBackground = a.getResourceId
      (
        R.styleable.Gallery_android_galleryItemBackground, 0
      );
      a.recycle();
    }
    
    @Override
    public int getCount()
    {
      // TODO Auto-generated method stub
      return myImageIds.length;
    }
    
    @Override
    public Object getItem(int  position)
    {
      // TODO Auto-generated method stub
      return null;
    }
    @Override
    public long getItemId(int  position)
    {
      // TODO Auto-generated method stub
      return position;
    }
    @Override
    public View getView
    (int position, View convertView, ViewGroup parent)
    {
      // TODO Auto-generated method stub
      
      /*产生ImageView对象*/
      ImageView i = new ImageView(mContext);
      /*设置图片给imageView对象*/
      i.setImageResource(myImageIds[position]);
      /*重新设置图片的宽高*/
      i.setScaleType(ImageView.ScaleType.FIT_XY);
      /*重新设置Layout的宽高*/
      i.setLayoutParams(new Gallery.LayoutParams(138, 108));
      /*设置Gallery背景图*/
      i.setBackgroundResource(mGalleryItemBackground);
      /*返回imageView对象*/
      return i;
    }
  }
  
  @Override
  public void setWallpaper(InputStream data) throws IOException
  {
    // TODO Auto-generated method stub
    super.setWallpaper(data);
  }
}

						