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" };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.test);gview = (GridView) findViewById(R.id.gview);//新建Listdata_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--><GridViewandroid: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 --><ImageViewandroid: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"> <ImageViewandroid: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Idint[] 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 };@Overrideprotected 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MapList<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SimpleAdapterSimpleAdapter 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(){@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubimageview.setImageResource(imagesIds[position]);} });}@Overridepublic 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;}@Overridepublic 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);} }

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