Android控件开发之Gallery

Gallery是Android中的图片库控件。可以浏览自己的图片相册。

效果图

本程序main.xml源码

本程序ImageAdapter类源码

package com.sx.Gallery;

 <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello" />  <Gallery      android:id="@+id/gallery"      android:layout_width="fill_parent"      android:layout_height="fill_parent"    android:spacing="2px" />      <!-- android:spacing="2px"用来设置图片之间的间距 -->     </LinearLayout>

JAVA源码

import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class ImageAdapter extends BaseAdapter  {           private Context context;               private int[] MyImageIDs =           {   R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,R.drawable.img6,R.drawable.img7,R.drawable.img8,R.drawable.img9,R.drawable.img10,R.drawable.img11,R.drawable.img12,R.drawable.img13,R.drawable.img14,R.drawable.img15,R.drawable.img16,R.drawable.img17,R.drawable.img18,R.drawable.img19,R.drawable.img20         };      public ImageAdapter(Context context)  {  this.context = context;   }  // 获取图片个数  public int getCount()  {    return MyImageIDs.length;//return Integer.MAX_VALUE;}  // 获取图片在库中的位置  public Object getItem(int position)  {   return position;  }  // 获取图片在库中的ID  public long getItemId(int id)  {   return id;  }  public View getView(int position, View convertView, ViewGroup parent)  {  ImageView imageview = new ImageView(this.context);  // 给ImageView设置资源   imageview.setImageResource(this.MyImageIDs[position]);  // 设置布局 图片120*120   imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));   // 设置显示比例类型   imageview.setScaleType(ImageView.ScaleType.FIT_XY);//imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);   return imageview;   }  }  //要想实现图片无限循环可拖动修改getCount()  函数改为返回值为return Integer.MAX_VALUE;//imageview.setImageResource(this.MyImageIDs[position] % MyImageIDs.length.);  即可 Activity源码package com.sx.Gallery;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Gallery;import android.widget.Toast;public class GalleryActivity extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);CreateGallery();}             private void CreateGallery()         {        //获得Gallery对象                  Gallery gellery=(Gallery)this.findViewById(R.id.gallery);                         //添加ImageAdapter给Gallery对象 注意哦Gallery类并没有setAdapter这个方法 这个方法是从AbsSpinner类继承的                 gellery.setAdapter(new ImageAdapter(this));                 //设置Gallery的背景图片                  //gellery.setBackgroundResource(R.drawable.bg0);                  //设置Gallery的事件监听                 gellery.setOnItemClickListener(new GalleryItemListener());              }            class GalleryItemListener implements OnItemClickListener         {                public void onItemClick(AdapterView<?> parent, View view, int position,  long id)             {                    Toast.makeText(GalleryActivity.this, "你选择了" + (position + 1) + " 号图片", Toast.LENGTH_SHORT).show();                }            }}

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