android开发

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Java

EX07_07.java：源码内容
							package irdc.ex07_07;
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.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewSwitcher;
import android.widget.Gallery.LayoutParams;
public class EX07_07 extends Activity implements 
  AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory
{
  protected static InputStream is;
  private ImageSwitcher mSwitcher;
  private Context mContext;
  
  /*设置在Gallery的图档*/
  private Integer[] mThumbIds =
  {
      R.drawable.sample_p1, R.drawable.sample_p2,
      R.drawable.sample_p3, R.drawable.sample_p4,
      R.drawable.sample_p5, R.drawable.sample_p6,
      R.drawable.sample_p7, R.drawable.sample_p8
  };
  /*设置在Switcher的图档*/
  private Integer[] mImageIds = 
  {
    R.drawable.p1, R.drawable.p2, R.drawable.p3,
    R.drawable.p4, R.drawable.p5, R.drawable.p6,
    R.drawable.p7, R.drawable.p8
  };
  
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.main);
    /*设置Switcher*/
    mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
    mSwitcher.setFactory(this);
    /*设置加载Switcher的模式*/
    mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_in));
    /*设置输出Switcher的模式*/
    mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_out));
    Gallery g = (Gallery) findViewById(R.id.gallery);
    g.setAdapter(new ImageAdapter(this));
    g.setOnItemSelectedListener(this);
  
    /*设置点击Gallery的图片事件*/
    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(EX07_07.this)
        .setTitle(R.string.app_about)
        /*设置弹出窗口的图式*/
        .setIcon(mImageIds[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(mImageIds[position]);
           try
           {
             /*更换桌布*/
             setWallpaper(is); 
             /*用Toast来显示桌布已更换*/
             Toast.makeText(EX07_07.this, getString
             (R.string.my_text_pre),Toast.LENGTH_SHORT).show();
           }
           catch (Exception e)
           {            
             e.printStackTrace();
           };
         }
       })
        /*设置跳出窗口的返回事件*/
        .setNegativeButton(R.string.str_no,
         new DialogInterface.OnClickListener()
        {
          public void onClick(DialogInterface dialoginterface,int i)
         {
            /*用Toast来显示桌布已取消*/
            Toast.makeText(EX07_07.this, getString(R.string.
                my_text_no),Toast.LENGTH_SHORT).show();
         }
        })
        .show();
      }     
    });
  }  
  
  /*设置加载Switcher的图档*/
  public void onItemSelected(AdapterView parent, View v,
      int position, long id) 
  {
    mSwitcher.setImageResource(mImageIds[position]);
  }
  public void onNothingSelected(AdapterView parent)
  {
    
  }
  /*呈现Switcher的模式*/
  public View makeView() 
  {
    ImageView i = new ImageView(this);
    i.setBackgroundColor(0xFF000000);
    i.setScaleType(ImageView.ScaleType.FIT_CENTER);
    i.setLayoutParams(new ImageSwitcher.LayoutParams(
        LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
    return i;
  }
  public class ImageAdapter extends BaseAdapter
  {
    public ImageAdapter(Context c)
    {
     mContext = c;
    }
    public int getCount() 
    {
      return mImageIds.length;
    }
    public Object getItem(int position)
    {
      return position;
    }
    public long getItemId(int position)
    {
      return position;
    }
    /*显示Gallery里的模式*/
    public View getView(int position, View convertView,
                          ViewGroup parent)
    {
      ImageView i = new ImageView(mContext);
      i.setImageResource(mThumbIds[position]);
      i.setAdjustViewBounds(true);
      i.setLayoutParams(new Gallery.LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
      i.setBackgroundResource(R.drawable.picture_frame);
      return i;
    }
  }
}

						