【Android基础入门〖13〗】Gallery

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目录(?)[+]

1 在 xml 布局中添加 Gallery

activity_main.xml

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
     android:layout_width="match_parent"  
     android:layout_height="match_parent">  
     <Gallery  
         android:id="@+id/gallery"  
         android:layout_width="match_parent"  
         android:layout_height="match_parent"/>  
 </LinearLayout>  
 

2 自定义 ImageAdapter

ImageAdapter.java

  package com.example.gallery;  
 import java.util.List;  
 import android.content.Context;  
 import android.content.res.TypedArray;  
 import android.view.View;  
 import android.view.ViewGroup;  
 import android.widget.BaseAdapter;  
 import android.widget.Gallery;  
 import android.widget.ImageView;  
 @SuppressWarnings("deprecation")  
 public class ImageAdapter extends BaseAdapter {  
       
     private Context context;  
     private List<Integer> list;  
     private TypedArray typedArray;  
     private int item_background;  
       
     public ImageAdapter(Context context ,List<Integer> list)  
     {  
         this.context=context;  
         this.list=list;  
         this.typedArray = context.obtainStyledAttributes(R.styleable.gallery_style);  
         item_background=typedArray.getResourceId(R.styleable.gallery_style_android_galleryItemBackground, 0);  
         typedArray.recycle();  
     }  
     @Override  
     public int getCount() {  
         return list.size();  
     }  
     @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(context);  
         //设置显示的图片  
         imageView.setImageResource(list.get(position));  
           
         //设置伸缩规格  
         imageView.setScaleType(ImageView.ScaleType.FIT_XY);  
           
         //设置布局参数  
         imageView.setLayoutParams(new Gallery.LayoutParams(150,100));  
           
         //设置背景边框  
         imageView.setBackgroundResource(item_background);  
           
         return imageView;  
     }  
 }  
 

3 每个 ImageView 的背景参数

res/values/attrs.xml

  <?xml version="1.0" encoding="utf-8"?>  
 <resources>  
     <declare-styleable name="gallery_style">  
         <attr name="android:galleryItemBackground" />  
     </declare-styleable>  
 </resources>  
 

4 在 MainActivity 中绑定数据与设置监听

MainActivity.java

  package com.example.gallery;  
 import java.util.ArrayList;  
 import android.app.Activity;  
 import android.os.Bundle;  
 import android.view.View;  
 import android.widget.AdapterView;  
 import android.widget.Gallery;  
 import android.widget.Toast;  
 @SuppressWarnings("deprecation")  
 public class MainActivity extends Activity {  
     @Override  
     protected void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.activity_main);  
         Gallery gallery=(Gallery)findViewById(R.id.gallery);  
           
         ArrayList<Integer>list=new ArrayList<Integer>();  
         list.add(R.drawable.img1);  
         list.add(R.drawable.img2);  
         list.add(R.drawable.img3);  
         list.add(R.drawable.img4);  
         list.add(R.drawable.img5);  
         list.add(R.drawable.img6);  
         list.add(R.drawable.img7);  
           
         ImageAdapter adapter=new ImageAdapter(this,list);  
         gallery.setAdapter(adapter);  
           
         gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {    
             @Override    
             public void onItemSelected(AdapterView<?> parent, View v,int position, long id) {    
                 Toast.makeText(getApplicationContext(), "选择了:  "+   
                                String.valueOf(position), Toast.LENGTH_SHORT).show();  
             }    
               
             @Override    
             public void onNothingSelected(AdapterView<?> arg0) {    
             //这里不做响应    
             }    
         });   
     }  
 }  
 