<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: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="com.kale.gallery.MainActivity"     android:orientation="vertical">        <!--         android:animationDuration="1000"    图片切换动画持续时间        android:spacing="8dp"                 设置图片之间的间距        android:unselectedAlpha="0.6"        设置没有选择的图片的透明度     -->    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="用ImageView作预览图"        android:textAppearance="?android:attr/textAppearanceMedium" />    <ImageView        android:id="@+id/imageView_id"        android:layout_width="100dp"        android:layout_height="100dp"        android:layout_gravity="center_horizontal"        android:scaleType="fitXY"        android:src="@drawable/ic_launcher" />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="60dp"        android:text="下方是gallery"        android:textAppearance="?android:attr/textAppearanceMedium" />    <Gallery        android:id="@+id/gallery_id"        android:layout_marginTop="10dp"        android:layout_width="match_parent"                android:layout_height="80dp"        android:animationDuration="1000"        android:spacing="8dp"         android:unselectedAlpha="0.3"/></LinearLayout>

package com.kale.gallery;import android.app.Activity;import android.content.Context;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.Gallery.LayoutParams;import android.widget.ImageView;@SuppressWarnings("deprecation")public class MainActivity extends Activity {    ImageView iV;    Gallery gallery;        int[] imageIds = new int [] {            R.drawable.appstore,            R.drawable.cydia,            R.drawable.itunes,            R.drawable.mail,            R.drawable.safair    };        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                viewInit();        gallery.setAdapter(new ImageAdapter(this));        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView<?> arg0, View arg1,                    int arg2, long arg3) {                // TODO 自动生成的方法存根                iV.setImageResource(imageIds[arg2]);                            }            @Override            public void onNothingSelected(AdapterView<?> arg0) {                // TODO 自动生成的方法存根                            }        });    }            public class ImageAdapter extends BaseAdapter {        private Context mContext;            public ImageAdapter(Context context) {            mContext = context;        }        public int getCount() {             return imageIds.length;        }        public Object getItem(int position) {            return position;        }        public long getItemId(int position) {            return position;        }        public View getView(int position, View convertView, ViewGroup parent) {            ImageView image = new ImageView(mContext);            image.setImageResource(imageIds[position]);            //设置缩放类型            image.setScaleType(ImageView.ScaleType.FIT_XY);            image.setAdjustViewBounds(true);            //设置布局参数            image.setLayoutParams(new Gallery.LayoutParams(                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));            return image;        }    }    private void viewInit() {        // TODO 自动生成的方法存根        gallery = (Gallery) findViewById(R.id.gallery_id);        iV = (ImageView)findViewById(R.id.imageView_id);    }}