androidUI GridView(九宫图)

GridView跟ListView都是比较常用的多控件布局，而GridView更是实现九宫图的首选!本文就是介绍如何使用GridView实现九宫图。GridView的用法很多，网上介绍最多的方法就是自己实现一个ImageAdapter继承BaseAdapter，再供GridView使用，类似这种的方法本文不再重复，本文介绍的GridView用法跟前文ListView的极其类似。。。。也算是我偷懒一下，嘻嘻嘻嘻。。。。

       先来贴出本文代码运行的结果：

 

本文需要添加/修改3个文件：main.xml、night_item.xml、JAVA源代码。

main.xml源代码如下，本身是个GirdView，用于装载Item：

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:columnWidth="90dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
/>

<?xml version="1.0" encoding="utf-8"?> <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:numColumns="auto_fit" android:verticalSpacing="10dp" android:horizontalSpacing="10dp" android:columnWidth="90dp" android:stretchMode="columnWidth" android:gravity="center" />

 

介绍一下里面的某些属性：

android:numColumns="auto_fit" ，GridView的列数设置为自动

android:columnWidth="90dp"，每列的宽度，也就是Item的宽度
android:stretchMode="columnWidth"，缩放与列宽大小同步
android:verticalSpacing="10dp"，两行之间的边距，如：行一(NO.0~NO.2)与行二(NO.3~NO.5)间距为10dp
android:horizontalSpacing="10dp"，两列之间的边距。

 

接下来介绍 night_item.xml，这个XML跟前面ListView的ImageItem.xml很类似：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_height="wrap_content"
         android:paddingBottom="4dip" android:layout_width="fill_parent">
         <ImageView
               android:layout_height="wrap_content"
               android:id="@+id/ItemImage"
               android:layout_width="wrap_content"
               android:layout_centerHorizontal="true">
         </ImageView>
         <TextView
               android:layout_width="wrap_content"
               android:layout_below="@+id/ItemImage"
               android:layout_height="wrap_content"
               android:text="TextView01"
               android:layout_centerHorizontal="true"
               android:id="@+id/ItemText">
         </TextView>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:paddingBottom="4dip" android:layout_width="fill_parent"> <ImageView android:layout_height="wrap_content" android:id="@+id/ItemImage" android:layout_width="wrap_content" android:layout_centerHorizontal="true"> </ImageView> <TextView android:layout_width="wrap_content" android:layout_below="@+id/ItemImage" android:layout_height="wrap_content" android:text="TextView01" android:layout_centerHorizontal="true" android:id="@+id/ItemText"> </TextView> </RelativeLayout>

 

 

最后就是JAVA的源代码了，也跟前面的ListView的JAVA源代码很类似，不过多了“选中”的事件处理：

  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      GridView gridview = (GridView) findViewById(R.id.gridview);

      //生成动态数组，并且转入数据
      ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
      for(int i=0;i<10;i++)
      {
        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("ItemImage", R.drawable.icon);//添加图像资源的ID
    map.put("ItemText", "NO."+String.valueOf(i));//按序号做ItemText
        lstImageItem.add(map);
      }
      //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应
      SimpleAdapter saImageItems = new SimpleAdapter(this, //没什么解释
                                                lstImageItem,//数据来源
                                                R.layout.night_item,//night_item的XML实现

                                                //动态数组与ImageItem对应的子项
                                                new String[] {"ItemImage","ItemText"},

                                                //ImageItem的XML文件里面的一个ImageView,两个TextView ID
                                                new int[] {R.id.ItemImage,R.id.ItemText});
      //添加并且显示
      gridview.setAdapter(saImageItems);
      //添加消息处理
      gridview.setOnItemClickListener(new ItemClickListener());
  }

  //当AdapterView被单击(触摸屏或者键盘)，则返回的Item单击事件
  class  ItemClickListener implements OnItemClickListener
  {
public void onItemClick(AdapterView<?> arg0,//The AdapterView where the click happened
                                  View arg1,//The view within the AdapterView that was clicked
                                  int arg2,//The position of the view in the adapter
                                  long arg3//The row id of the item that was clicked
                                  ) {
    //在本例中arg2=arg3
    HashMap<String, Object> item=(HashMap<String, Object>) arg0.getItemAtPosition(arg2);
    //显示所选Item的ItemText
    setTitle((String)item.get("ItemText"));
}

  }

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); GridView gridview = (GridView) findViewById(R.id.gridview); //生成动态数组，并且转入数据 ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>(); for(int i=0;i<10;i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("ItemImage", R.drawable.icon);//添加图像资源的ID map.put("ItemText", "NO."+String.valueOf(i));//按序号做ItemText lstImageItem.add(map); } //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应 SimpleAdapter saImageItems = new SimpleAdapter(this, //没什么解释 lstImageItem,//数据来源 R.layout.night_item,//night_item的XML实现 //动态数组与ImageItem对应的子项 new String[] {"ItemImage","ItemText"}, //ImageItem的XML文件里面的一个ImageView,两个TextView ID new int[] {R.id.ItemImage,R.id.ItemText}); //添加并且显示 gridview.setAdapter(saImageItems); //添加消息处理 gridview.setOnItemClickListener(new ItemClickListener()); } //当AdapterView被单击(触摸屏或者键盘)，则返回的Item单击事件 class ItemClickListener implements OnItemClickListener { public void onItemClick(AdapterView<?> arg0,//The AdapterView where the click happened View arg1,//The view within the AdapterView that was clicked int arg2,//The position of the view in the adapter long arg3//The row id of the item that was clicked ) { //在本例中arg2=arg3 HashMap<String, Object> item=(HashMap<String, Object>) arg0.getItemAtPosition(arg2); //显示所选Item的ItemText setTitle((String)item.get("ItemText")); } }