<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">    <ImageView        android:id="@+id/imageView"        android:layout_width="320dp"        android:layout_height="320dp"/>    <Gallery        android: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;    @Override    protected 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(){    @Override    public int getCount() {        return imageIds.length;    }    @Override    public Object getItem(int position) {        return position;    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public 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(){    @Override    public void onItemSelected(AdapterView<?> parent, View view, int position,            long id) {        imageView.setImageResource(imageIds[position]);            }    @Override    public void onNothingSelected(AdapterView<?> parent) {        }    });    }    }