Android中Gallery和ImageSwitcher的使用实例

<relativelayout 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:paddingbottom="@dimen/activity_vertical_margin"
  android:paddingleft="@dimen/activity_horizontal_margin"
  android:paddingright="@dimen/activity_horizontal_margin"
  android:paddingtop="@dimen/activity_vertical_margin"
  tools:context=".mainactivity" >
  <imageswitcher
    android:id="@+id/imageswitcher"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="2"
    android:paddingtop="30px" >
  </imageswitcher>
  <gallery
    android:id="@+id/gallery1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:spacing="5px"
    android:unselectedalpha="0.6" />
</relativelayout>

import android.app.actionbar.layoutparams;
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.viewswitcher.viewfactory;
public class mainactivity extends activity {
  private int imageid[] = new int[] { r.drawable.a, r.drawable.b,
      r.drawable.c, r.drawable.d, r.drawable.e, r.drawable.f,
      r.drawable.g, r.drawable.h, r.drawable.i, r.drawable.j,
      r.drawable.k };
  private imageswitcher imageswitcher;
  private gallery gallery;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    imageswitcher = (imageswitcher) this.findviewbyid(r.id.imageswitcher);
    gallery = (gallery) this.findviewbyid(r.id.gallery1);
    // 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() {
        imageview imageview = new imageview(mainactivity.this);
        imageview.setscaletype(imageview.scaletype.fit_center); // 设置保持纵横比居中
        imageview.setlayoutparams(new imageswitcher.layoutparams(
            layoutparams.wrap_content, layoutparams.wrap_content));
        return imageview;
      }
    });
    galleryadapter adapter = new galleryadapter(mainactivity.this,imageid);
    gallery.setadapter(adapter);
    gallery.setselection(imageid.length / 2);
    gallery.setonitemselectedlistener(new onitemselectedlistener() {
      @override
      public void onitemselected(adapterview<?> parent, view view,int position, long id) {
        imageswitcher.setimageresource(imageid[position]);
      }
      @override
      public void onnothingselected(adapterview<?> arg0) {
      }
    });
  }
}

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 galleryadapter extends baseadapter {
  private int[] imageid;
  private context mcontext;
  /**
   * 穿入上下文和图片资源数组
   * @param mcontext
   * @param imageid
   */
  public galleryadapter(context mcontext, int[] imageid) {
    this.mcontext = mcontext;
    this.imageid = imageid;
  }
  @override
  public int getcount() {
    return imageid.length;
  }
  @override
  public object getitem(int position) {
    return imageid[position];
  }
  @override
  public long getitemid(int position) {
    return position;
  }
  @override
  public view getview(int position, view convertview, viewgroup parent) {
    imageview imageview1;
    if (convertview == null) {
      imageview1 = new imageview(mcontext);
      imageview1.setscaletype(imageview.scaletype.fit_xy);
      imageview1.setlayoutparams(new gallery.layoutparams(180, 135));
      typedarray typedarray = mcontext
          .obtainstyledattributes(r.styleable.gallery);
      imageview1.setbackgroundresource(typedarray.getresourceid(
          r.styleable.gallery_android_galleryitembackground, 0));
      imageview1.setpadding(5, 0, 5, 0); // 设置imageview的内边距
    } else {
      imageview1 = (imageview) convertview;
    }
    imageview1.setimageresource(imageid[position]); // 为imageview设置要显示的图片
    return imageview1; // 返回imageview
  }
}