<LinearLayout 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:orientation="vertical"><ImageViewandroid:id="@+id/imageView"android:layout_width="320dp"android:layout_height="320dp"/><Galleryandroid:id="@+id/gallery"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="25dp"android:unselectedAlpha="0.6"android:spacing="2pt" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="Gallery"><attr name="android:galleryItemBackground" /></declare-styleable>
</resources>

package com.example.gallery;
import android.app.Activity;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;@SuppressWarnings("deprecation")
public class MainActivity extends Activity {int[] imageIds=new int[]{R.drawable.shuangzi,R.drawable.shuangyu,R.drawable.chunv,R.drawable.tiancheng,R.drawable.tianxie,R.drawable.sheshou,R.drawable.juxie,R.drawable.shuiping,R.drawable.shizi,R.drawable.baiyang,R.drawable.jinniu,R.drawable.mojie};Gallery gallery;ImageView imageView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);
gallery=(Gallery) findViewById(R.id.gallery);
imageView=(ImageView) findViewById(R.id.imageView);
BaseAdapter baseAdapter=new BaseAdapter(){@Overridepublic int getCount() {return imageIds.length;}@Overridepublic Object getItem(int position) {return position;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView=new ImageView(MainActivity.this);imageView.setImageResource(imageIds[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);imageView.setLayoutParams(new Gallery.LayoutParams(75,100));TypedArray typedArray = obtainStyledAttributes(R.styleable.Gallery);imageView.setBackgroundResource(typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0));return imageView;}};
gallery.setAdapter(baseAdapter);
gallery.setOnItemSelectedListener(new OnItemSelectedListener(){@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position,long id) {imageView.setImageResource(imageIds[position]);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});}}