Android利用GridView实现单选效果

1.实现如图所示的单选效果

由于android提供的单选按钮radiobutton只能单行或单列显示，且样式并不美观，故可用gridview进行改造，实现单选效果，而要实现这样的效果重点就在gridview的适配器这块了。

首先是gridview的item的xml：

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 <relativelayout
  android:id="@+id/options"
  android:layout_width="match_parent"
  android:layout_height="143dp">
  <imageview
   android:id="@+id/imageview"
   android:layout_width="65dp"
   android:layout_height="65dp"/>
  <textview
   android:id="@+id/textview"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerinparent="true"
   android:text="通讯录"/>
 </relativelayout>
</linearlayout>

里边很简单，就只用来放显示选中效果的imageview和文字的textview

接下来是适配器：

public class gridviewradioadapter extends baseadapter {
 private context mcontext;
 private int lastposition = -1;   //记录上一次选中的图片位置，默认不选中
 private string[] str = null;    //放问题内容文字的数组

 public gridviewradioadapter(context mcontext) {
  this.mcontext = mcontext;
 }

 public void setstr(string[] str){  //在activity中调用此方法传入问题的数组
  this.str = str;
 }

 public void setselection(int position) { //在activity中gridview的onitemclicklistener中调用此方法，来设置选中位置
  lastposition = position;
 }

 @override
 public int getcount() {
  return str.length;
 }

 @override
 public object getitem(int position) {
  return position;
 }

 @override
 public long getitemid(int position) {
  return position;
 }

 @override
 public view getview(int position, view convertview, viewgroup parent) {
  viewholder viewholder = null;
  if (convertview == null){
   viewholder = new viewholder();
   convertview = layoutinflater.from(mcontext).inflate(r.layout.adapter_gridview_radio_item, null);
   viewholder.textview = (textview) convertview.findviewbyid(r.id.textview);
   viewholder.imageview = (imageview) convertview.findviewbyid(r.id.imageview);
   viewholder.relativelayout = (relativelayout) convertview.findviewbyid(r.id.options);
   convertview.settag(viewholder);
  }else {
   viewholder = (viewholder) convertview.gettag();
  }
  viewholder.textview.settext(str[position]);
  if (lastposition == position){ //判断是否为选中项，选中项与非选中项设置不同的样式
   switch (position){  //选中状态下设置样式
    case 0:
     viewholder.imageview.setbackgroundresource(r.drawable.option_a_checked);
     break;
    case 1:
     viewholder.imageview.setbackgroundresource(r.drawable.option_b_checked);
     break;
    case 2:
     viewholder.imageview.setbackgroundresource(r.drawable.option_c_checked);
     break;
    case 3:
     viewholder.imageview.setbackgroundresource(r.drawable.option_d_checked);
     break;
   }
   viewholder.relativelayout.setbackgroundresource(r.drawable.shape_rect_orange);
  }else {  //非选中状态下设置样式
   switch (position){
    case 0:
     viewholder.imageview.setbackgroundresource(r.drawable.option_a);
     break;
    case 1:
     viewholder.imageview.setbackgroundresource(r.drawable.option_b);
     break;
    case 2:
     viewholder.imageview.setbackgroundresource(r.drawable.option_c);
     break;
    case 3:
     viewholder.imageview.setbackgroundresource(r.drawable.option_d);
     break;
   }
   viewholder.relativelayout.setbackgroundresource(r.drawable.shape_rect_gray);
  }
  return convertview;
 }

 class viewholder{
  private textview textview;
  private imageview imageview;
  private relativelayout relativelayout;
 }
}

最后在activity中设置适配器：

gridviewradioadapter adapter = new gridviewradioadapter(mcontext);
adapter.setstr(options); //传入问题的选项
mgridview.setadapter(adapter);
mgridview.setonitemclicklistener(new adapterview.onitemclicklistener() {
 @override
 public void onitemclick(adapterview<?> arg0, view arg1, int position, long arg3) {
  adapter.setselection(position); //传值更新
  adapter.notifydatasetchanged(); //每一次点击通知adapter重新渲染
 }
}); 

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