記錄ListView單選模式

老項目不能用recyclerview，用的recyclerview就項目加載不出數據，當然可能是我版本用的低。。但是用高版本就報錯，無法運行項目，可能是我自己沒有配好。 閒話少說，公司項目需要做單選和多選的，就做一個記錄

下面直接貼代碼：

首先是adapter：

public class Myadapter extends BaseAdapter{
  private Context context;
    private ArrayList<User> datas=new ArrayList<>();

    private int TagPostion=-1;//默認未選中


    public ComPanyAdapter(Context context, ArrayList<User> list,int tagPostion) {
        this.context=context;
        this.datas=list;
       	this.TagPostion=tagPostion;

    }
    //這裏是用來回傳，調用這裏讓標識刷新，否則標識無法傳進來，無法刷新，則不顯示對應的已勾選單選標識
    public void setTagPostion(int TagPostion){
        this.TagPostion=TagPostion;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return datas.size();
    }

    @Override
    public Object getItem(int position) {
        return datas.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }



    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder;
        if (convertView==null){
            viewHolder=new ViewHolder();
            convertView=LayoutInflater.from(context).inflate(R.layout.item_company,null);
            viewHolder.apace_item= (TextView) convertView.findViewById(R.id.item_tv);
            viewHolder.apace_image= (ImageView) convertView.findViewById(R.id.apace_image);
            convertView.setTag(viewHolder);
        }else {
            viewHolder= (ViewHolder) convertView.getTag();
        }

        viewHolder.apace_item.setText(datas.get(position).getName());
        
        if (TagPostion==position){
            viewHolder.apace_image.setVisibility(View.VISIBLE);
            viewHolder.apace_image.setImageResource(R.drawable.gou);
        }else {
            viewHolder.apace_image.setVisibility(View.GONE);
        }


        return convertView;
    }

    static class ViewHolder {
        TextView apace_item;
        ImageView apace_image;
    }

}

這裏是對應的Bean：

public class User{
private int id;
private String name;

public int getId(){
	return id;
}
public void setId(int id){
	this.id=id;
}
public string getName(){
	return name;
}
public void setName(string name){
	this.name=name;
}
}

對應的activity：

//這裏的BaseActivity改成自己項目的activity基類....別啥都不看就複製。。沒有寫基類就用系統自帶的ActivityCompat
public class MainActivity extends BaseActivity{
	private ListView list;
	private ArrayList<User> datas;
	private String userName; //要回傳的參數
	private int TagPosition=-1;//默認未選中爲-1；
	private string selectedString="";//已經選中的數據
	private MyAdapter adapter;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_building);
        Intent intent = getIntent();
        //上個界面獲取到的數據（可無視）
        selectedString= intent.getStringExtra("company");
        initView();
        //數據
        getData();
    }
private void initView(){
 		list = (ListView) findViewById(R.id.list_view);
        list.setItemsCanFocus(false);
        list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        adapter=new MyAdapter(MainActivity.this, datas,TagPosition);
        list.setAdapter(adapter);
           list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                TagPosition = position;
                adapter.setTagPostion(TagPosition);

            }
        });
        
}
  private ArrayList<User> getData(){
        users=new ArrayList<>();
        for (int i=0;i<20;i++){
            User user=new User();
            user.setId(i);
            user.setName("張三"+i);
            datas.add(user);
        }
        return datas;
    }

}

xml文件佈局（很簡單）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#ffffff"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/list_view"
        android:layout_below="@id/include_head"
        android:layout_width="match_parent"
        android:divider="#eeeeee"
        android:dividerHeight="0.5dp"
        android:fadingEdge="none"
        android:layout_height="match_parent"/>



</RelativeLayout>

對應item佈局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:paddingTop="7dp"
    android:background="@drawable/list_view_item_bg"
    android:paddingBottom="7dp"
    android:layout_height="80dp">

    <TextView
        android:id="@+id/item_tv"
        android:layout_width="wrap_content"
        android:textSize="24dp"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/apace_image"
        android:layout_width="wrap_content"
        android:background="@drawable/gou"
        android:visibility="gone"
        android:layout_centerVertical="true"
        android:layout_alignParentRight="true"
        android:layout_height="wrap_content" />

</RelativeLayout>

image隨便去阿里圖庫找一個勾就好了。。。圖標就不上傳了
以上 結束