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  }}