Android中Gallery和ImageSwitcher的使用实例

效果如下：

布局文件activity_main.xml如下：

<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>

MainActivity.java代码如下：

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) {
     }
   });
 }
}

其中需要的一个适配器：

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
 }
}

到此 OK！

来源：https://blog.csdn.net/xlgen157387/article/details/45969277