【Android Demo】图片之网格视图(GridView)

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <GridView android:id="@+id/gridview" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:numColumns="auto_fit"
        android:columnWidth="100sp" android:stretchMode="columnWidth"
        android:gravity="center" />    
</FrameLayout>

package wei.ye.g1;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class Wangge extends Activity {
    private static int[] images = { R.drawable.baos, R.drawable.caoc,
            R.drawable.chenyj, R.drawable.chenyy, R.drawable.gouj,
            R.drawable.guany, R.drawable.hanx, R.drawable.lp, R.drawable.liub,
            R.drawable.qinq, R.drawable.tiemz, R.drawable.wus,
            R.drawable.xiangy, R.drawable.yuef, R.drawable.zhaoky,
            R.drawable.zhugl, R.drawable.xis, R.drawable.yingz };
    GridView gv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.wangge);
        setTitle("网格视图");
        gv = (GridView) findViewById(R.id.gridview);
        gv.setAdapter(new ImageAdapter(this));
    }

    public class ImageAdapter extends BaseAdapter {
        private Context mContext;

        public ImageAdapter(Context c) {
            mContext = c;
        }

        @Override
        public int getCount() {
            return images.length;
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        // 创建一个ImageView，并设定对应的图片.images 就是需要显示的图片
        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;
            // System.out.println(convertView);
            // if -- else 为了节省内存空间，减少对象的创建
            if (convertView == null) {
                imageView = new ImageView(mContext);
                //设置显示图片的大小
                imageView.setLayoutParams(new GridView.LayoutParams(120, 120));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(8, 8, 8, 8);
            } else {
                imageView = (ImageView) convertView;
            }

            imageView.setImageResource(images[position]);
            return imageView;
        }

    }
}