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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最好的感觉就是你什么都跟我说。