gridview 和 adapter 的运用，没用运用匿名类。

一. 和运用listview一样，首先需要在onCreate方法中，查找并初始化视图。

二. 在onCreate 方法中，初始化一个adapter，关键是在初始化adapter时，用到了构造方法，这个构造方法是带3个参数的，其中第一个参数，是把当前content即activity，代入到了adapter视图中，帮助adapter视图完成查找解析资源文件的功能。

这段代码是在主activity中的。即gridview中的。

adapter = new MainAdapter(this, names, icons);

这段代码是在adapter中的，即baseadapter中的，其中在View.inflate的语句中，context是从构造方法中传入的上下文。

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        
        if(convertView==null) {
            convertView = View.inflate(context, R.layout.item_main, null);
        }
        
        ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_item_icon);
        TextView textView = (TextView) convertView.findViewById(R.id.tv_item_name);
        imageView.setImageResource(icons[position]);
        textView.setText(names[position]);
        
        return convertView;
    }

三.大体步骤为，a）初始化gridview，b）初始化adapter，c）设置GridView的adpater为新new出来的adapter，d）设置监听事件setOnItemClickListener

 

 

以下为完整代码

package com.atguigu.app03_gridview;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;

public class MainActivity extends Activity {

    private GridView gv_main;
    private MainAdapter adapter;
    String[] names = new String[] { "手机防盗", "通讯卫士", "软件管理", "流量管理", "进程管理",
            "手机杀毒", "缓存清理", "高级工具", "设置中心" };

    int[] icons = new int[] { R.drawable.widget01, R.drawable.widget02,
            R.drawable.widget03, R.drawable.widget04, R.drawable.widget05,
            R.drawable.widget06, R.drawable.widget07, R.drawable.widget08,
            R.drawable.widget09 };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        gv_main = (GridView) findViewById(R.id.gv_main);
        adapter = new MainAdapter(this, names, icons);
        
        gv_main.setAdapter(adapter);
        
        //给gridView的Item设置点击监听
        gv_main.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                //得到当前点击的名称
                String name = names[position];
                //提示
                Toast.makeText(MainActivity.this, name, 1).show();
            }
        });
    }
}

 

package com.atguigu.app03_gridview;

import android.content.Context;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MainAdapter extends BaseAdapter {

    private String[] names;
    private int[] icons;
    private Context context;
    
    public MainAdapter(Context context, String[] names, int[] icons) {
        super();
        this.context = context;
        this.names = names;
        this.icons = icons;
    }

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

    @Override
    public Object getItem(int position) {
        return names[position];
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        
        if(convertView==null) {
            convertView = View.inflate(context, R.layout.item_main, null);
        }
        
        ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_item_icon);
        TextView textView = (TextView) convertView.findViewById(R.id.tv_item_name);
        imageView.setImageResource(icons[position]);
        textView.setText(names[position]);
        
        return convertView;
    }

}