Android基础类之BaseAdapter

标签：android

说明：上面一行图片是Gallery画廊，每次点击一个Gallery图片时，会同时在下面以大图形式显示出来该图片

<?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/gallery1" 
    android:layout_width="match_parent" 
    android:spacing="5px" 
    android:layout_height="wrap_content" 
></Gallery>
<ImageView
    android:id="@+id/iv"
    android:layout_gravity="center_vertical"
    android:layout_marginTop="20px"
    android:layout_width="320px"
    android:layout_height="320px"
    ></ImageView>
    
</LinearLayout>

package com.magc.adapter;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity {
    private Gallery gallery;
    private ImageView imgview;
    private int[] imgs = {R.drawable.a6,R.drawable.a1,R.drawable.a2,R.drawable.a3,R.drawable.a4,R.drawable.a5};
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imgview = (ImageView)findViewById(R.id.iv);
        gallery = (Gallery)findViewById(R.id.gallery1);
        MyImgAdapter adapter = new MyImgAdapter(this);
        gallery.setAdapter(adapter);
        gallery.setOnItemClickListener(new OnItemClickListener() {
            //用户点击图片时，将该图片的ResourceID设到下面的ImageView中去，
            @Override
            public void onItemClick(AdapterView<?> arg0, View view, int position,
                    long arg3) {
                
                imgview.setImageResource(imgs[position]);
                
            }
        });
    }
    
     class MyImgAdapter extends BaseAdapter {
　　　　 //自定义图片Adapter以内部类形式存在于MainActivity中，方便访问MainActivity中的各个变量，特别是imgs数组
            private Context context;//用于接收传递过来的Context对象
            public MyImgAdapter(Context context) {
                super();
                this.context = context;
            }


            /* (non-Javadoc)
             * @see android.widget.Adapter#getCount()
             */
            @Override
            public int getCount() {
                return imgs.length;
            }

            /* (non-Javadoc)
             * @see android.widget.Adapter#getItem(int)
             */
            @Override
            public Object getItem(int position) {
                return position;
            }

            /* (non-Javadoc)
             * @see android.widget.Adapter#getItemId(int)
             */
            @Override
            public long getItemId(int position) {
                return position;
            }

            /* (non-Javadoc)
             * @see android.widget.Adapter#getView(int, android.view.View, android.view.ViewGroup)
             */
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                //针对每一个数据（即每一个图片ID）创建一个ImageView实例，
                ImageView iv = new ImageView(context);//针对外面传递过来的Context变量，
                iv.setImageResource(imgs[position]);
                Log.i("magc", String.valueOf(imgs[position]));
                iv.setLayoutParams(new Gallery.LayoutParams(80, 80));//设置Gallery中每一个图片的大小为80*80。
                iv.setScaleType(ImageView.ScaleType.FIT_XY);
                return iv;
            }

        }
    
}

Android基础类之BaseAdapter

标签：android

原文地址：http://blog.csdn.net/zyu67/article/details/43985571