Android 控件之十二：Gallery画廊

来源：互联网发布：沙漠之鹰数据图编辑：程序博客网时间：2024/06/05 12:49

import android.app.Activity;import android.content.Context;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.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;import android.widget.Toast;public class MainHelloGallery extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 定义UI组件final ImageView iv = (ImageView) findViewById(R.id.ImageView01);Gallery g = (Gallery) findViewById(R.id.Gallery01);// 设置图片匹配器g.setAdapter(new ImageAdapter(this));// 设置AdapterView点击监听器，Gallery是AdapterView的子类g.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// 显示点击的是第几张图片Toast.makeText(MainHelloGallery.this, "" + position,Toast.LENGTH_LONG).show();// 设置背景部分的ImageView显示当前Item的图片iv.setImageResource(((ImageView) view).getId());}});}// 定义继承BaseAdapter的匹配器public class ImageAdapter extends BaseAdapter {// Item的修饰背景int mGalleryItemBackground;// 上下文对象private Context mContext;// 图片数组private Integer[] mImageIds = { R.drawable.wallpaper_0,R.drawable.wallpaper_1, R.drawable.wallpaper_2,R.drawable.wallpaper_3, R.drawable.wallpaper_4,R.drawable.wallpaper_5, R.drawable.wallpaper_6,R.drawable.wallpaper_7, R.drawable.wallpaper_8,R.drawable.wallpaper_9 };// 构造方法public ImageAdapter(Context c) {mContext = c;// 读取styleable资源TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery);mGalleryItemBackground = a.getResourceId(R.styleable.HelloGallery_android_galleryItemBackground, 0);a.recycle();}// 返回项目数量@Overridepublic int getCount() {return mImageIds.length;}// 返回项目@Overridepublic Object getItem(int position) {return position;}// 返回项目Id@Overridepublic long getItemId(int position) {return position;}// 返回视图@Overridepublic View getView(int position, View convertVieww, ViewGroup parent) {ImageView iv = new ImageView(mContext);iv.setImageResource(mImageIds[position]);// 给生成的ImageView设置Id，不设置的话Id都是-1iv.setId(mImageIds[position]);iv.setLayoutParams(new Gallery.LayoutParams(1200, 160));iv.setScaleType(ImageView.ScaleType.FIT_XY);iv.setBackgroundResource(mGalleryItemBackgroundd);return iv;}}}

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/FrameLayout01"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >    <ImageView        android:id="@+id/ImageView01"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:src="@drawable/wallpaper_0" >    </ImageView>    <Gallery        xmlns:android="http://schemas.android.com/apk/res/android"        android:id="@+id/Gallery01"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:spacing="5dp" >    </Gallery></FrameLayout>

在 res/values/目录中新建一个 attrs.xml内容如下：<?xml version="1.0" encoding="UTF-8"?><resources>    <declare-styleable name="HelloGallery" >        <attr name="android:galleryItemBackground" >        </attr>    </declare-styleable></resources>

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