ListView點擊或選中item改變背景

點擊或選中ListView中的一項后。使item背景改變，失去焦點相同顯示選中的背景。又一次選中另外一項才刷新；

在Adapter中配置：

public class MyAdapter extends BaseAdapter{

 int mSelect = 0;   //選中項

     ......

 public void changeSelected(int positon){ //刷新方法
     if(positon != mSelect){
      mSelect = positon;
     notifyDataSetChanged();
     }
    }



public View getView(int position, View convertView, ViewGroup parent) {
//     if(convertView==null){
        LayoutInflater factory = LayoutInflater.from(context);
        View v = (View) factory.inflate(R.layout.list_item, null);
        TextView tv = (TextView) v.findViewById(R.id.Item_tv);
        tv.setText("test");
//     }
        if(mSelect==position){    
         v.setBackgroundResource(R.drawable.fc_bg);  //選中項背景
        }else{
         v.setBackgroundResource(R.drawable.bg);  //其它項背景
        }
        
        return v;
    }

}

 

配置好了之后，以下就是應用：

...........

mAdapter = new MyAdapter(...);

myList.setAdapter(mAdapter);

//////////點擊監聽

myList.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    mAdapter.changeSelected(position);//刷新

            }......}

////////////////選中監聽

myList.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                                mAdapter.changeSelected(position);//刷新

            }......}

 

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監聽view獲得焦點或按下等狀態的背景，能夠用selector。

    在res--drawable中配置樣式文件，如button_style.xml

  

   <?xml version="1.0" encoding="utf-8"?
>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/btn_bg_fc" /><!--按下時的背景-->
    <item android:state_focused="true" android:drawable="@drawable/btn_bg_fc" /><!--獲得焦點時的背景-->
    <item android:state_selected="true" android:drawable="@drawable/btn_bg_fc" /><!--選中狀態的背景-->
    <item android:drawable="@drawable/btn_bg" /> <!--默認背景-->
</selector>

    用在Listview，gridview中

       <ListView

          ......
         android:listSelector="@drawable/button_style"

         ......> </ListView>

     用於其它View,如Button,textview等

         android:background="@drawable/button_style"