UI组件之AdapterView及其子类（二）GridView网格视图的使用

GridView网格视图属性：

android:numColumns="auto_fit" --------列数设置为自动，可以为确定的数值
android:columnWidth="90dp"，----------每列的宽度，也就是Item的宽度
android:verticalSpacing="10dp"----------各单元格垂直边距
android:horizontalSpacing="10dp"-------各单元格水平边距

android:stretchMode------设置拉伸模式

none：不拉伸

spacingWidth:缩放与列宽大小同步

columnWidth:缩放与列宽大小同步

GridView 按行，列的形式来组织显示多个组件，ListView是GridView的特例。使用adpater使用方法与ListView一样

1、准备数据源
2、新建适配器
3、加载适配器
GridView(网格视图)是按照行列的方式来显示内容的，一般用于显示图片，图片等内容，比如实现九宫格图，用GridView是首选，也是最简单的

MainActivity.java

package com.example.testgridview;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.widget.GridView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
    private GridView gview;
    private List<Map<String, Object>> data_list;
    private SimpleAdapter sim_adapter;
    // 图片封装为一个数组
    private int[] icon = { R.drawable.address_book, R.drawable.calendar,
            R.drawable.camera, R.drawable.clock, R.drawable.games_control,
            R.drawable.messenger, R.drawable.ringtone, R.drawable.settings,
            R.drawable.speech_balloon, R.drawable.weather, R.drawable.world,
            R.drawable.youtube };
    private String[] iconName = { "通讯录", "日历", "照相机", "时钟", "游戏", "短信", "铃声",
            "设置", "语音", "天气", "浏览器", "视频" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
        gview = (GridView) findViewById(R.id.gview);
        //新建List
        data_list = new ArrayList<Map<String, Object>>();
        //获取数据
        getData();
        //新建适配器
        String [] from ={"image","text"};
        int [] to = {R.id.image,R.id.text};
        sim_adapter = new SimpleAdapter(this, data_list, R.layout.item, from, to);
        //配置适配器
        gview.setAdapter(sim_adapter);
    }

    
    
    public List<Map<String, Object>> getData(){        
        //cion和iconName的长度是相同的，这里任选其一都可以
        for(int i=0;i<icon.length;i++){
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("image", icon[i]);
            map.put("text", iconName[i]);
            data_list.add(map);
        }
            
        return data_list;
    }
    

}

test.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:background="#000"
    >
    
<GridView 
        android:id="@+id/gview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="auto_fit"    
        android:columnWidth="80dp"
        android:stretchMode="columnWidth"
        ></GridView>
</LinearLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" 
    android:gravity="center"
    android:padding="10dp"
    >
    
    
<ImageView 
    android:src="@drawable/ic_launcher"
    android:id="@+id/image"
    android:layout_width="60dp"
    android:layout_height="60dp"
    
    />

<TextView 
    android:id="@+id/text"
    android:layout_marginTop="5dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#ffffff"
    android:text="文字"
    />
</LinearLayout>

另外一个：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
<!-- GridView 组件的几个新属性 ，android:numColumns="4"该网格包含4列，包含多少行是动态改变的，由adapter决定-->
    <GridView
        android:id="@+id/gridView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:horizontalSpacing="1dp"       
        android:verticalSpacing="1dp" 
        android:numColumns="4">
    </GridView>
<!-- ImageView组件 -->
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="240dp"
        android:layout_height="240dp"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/bomb5" />

</LinearLayout>

cell.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="horizontal"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:gravity="center_horizontal"
	android:padding="2pt"
	>
<ImageView
	android:id="@+id/image1"
	android:layout_width="50dp" 
	android:layout_height="50dp" 
	/>	
</LinearLayout>

MainActivity.java

package com.example.gridviewtest;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
	
	/*
	 * GridView 按行，列的形式来组织显示多个组件，ListView是GridView的特例。使用adpater使用方法与ListView一样
	 * 
	 * */
	GridView grid;
	ImageView imageview;
	//图片的Id
	int[] imagesIds=new int[]{
		R.drawable.bomb5,R.drawable.bomb6,R.drawable.bomb7,R.drawable.bomb8,
		R.drawable.bomb9,R.drawable.bomb10,R.drawable.bomb11,R.drawable.bomb12,
		R.drawable.bomb13,R.drawable.bomb14,R.drawable.bomb15,R.drawable.bomb16		
	};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        imageview= (ImageView) findViewById(R.id.imageView1);
        //创建一个List对象，List独享的元素是Map
        List<Map<String,Object>> listitems=new ArrayList<Map<String,Object>>();
        for(int i=0;i<imagesIds.length;i++){
        	Map<String,Object> item=new HashMap<String,Object>();
        	item.put("image", imagesIds[i]);
        	listitems.add(item);
        }
        //使用自定义的布局cell.xml定义SimpleAdapter
        SimpleAdapter ad=new SimpleAdapter(this,listitems,R.layout.cell,new String[]{"image"},new int[]{R.id.image1});
        
        grid=(GridView) findViewById(R.id.gridView1);
        //设置适配器
        grid.setAdapter(ad);
        //添加列表项被单击时的监听器
        grid.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				imageview.setImageResource(imagesIds[position]);
			}        	
        });
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}