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：

         
              
               
           
      
     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     } });