Gallery使用示例(二)

main.xml如下:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    android:gravity="center_horizontal"   >    <ImageView        android:id="@+id/imageView"        android:layout_width="270dip"        android:layout_height="350dip"        android:layout_marginTop="20dip"        android:scaleType="fitXY"        android:layout_gravity="center_horizontal"       />    <Gallery         android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:spacing="10dip"        android:unselectedAlpha="0.6"        android:layout_gravity="center_horizontal"        android:layout_marginTop="40dip"             /></LinearLayout>

 

MainActivity如下:

import android.os.Bundle;import android.app.Activity;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;/** * Demo描述: * 利用Gallery预览图片.点击其中的某张图片时 * 将该图片在ImageView中显示 * */public class MainActivity extends Activity {    private int imagesID []= null;    private Gallery mGallery;    private ImageView mImageView;    private BaseAdapter mBaseAdapter;    @Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();mGallery.setAdapter(mBaseAdapter);//mGallery初始时显示的图片mGallery.setSelection(imagesID.length/2);mGallery.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {Toast.makeText(getApplicationContext(),    "点击了第" + (position + 1) + "张图片", Toast.LENGTH_SHORT).show();//点击时切换图片mImageView.setImageResource(imagesID[position]);}});}   private void init() {mGallery=(Gallery) findViewById(R.id.gallery);imagesID=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};mImageView=(ImageView) findViewById(R.id.imageView);//mImageView初始时显示的图片mImageView.setImageResource(imagesID[imagesID.length/2]);mBaseAdapter = new BaseAdapter() {@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ImageView imageView = new ImageView(MainActivity.this);//设置图片来源imageView.setImageResource(imagesID[position]);//拉伸图片以填充View的高宽imageView.setScaleType(ImageView.ScaleType.FIT_XY);//控制显示图片的大小imageView.setLayoutParams(new Gallery.LayoutParams(130, 130));imageView.setBackgroundColor(0xFF000000);return imageView;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic Object getItem(int position) {return position;}@Overridepublic int getCount() {return imagesID.length;}};}}