ArrayAdapter和BaseAdapter实现同一功能中的差异？

￡神魔★判官ぃ 2022-04-25 03:28 204阅读 0赞

package cn.sharpeha.pipishare;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.BaseAdapter;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import java.util.List;
    
    class dateString {
    
        private String Year;
        private String Month;
    
    
        public dateString(String Year,String Month){
            this.Year=Year;
            this.Month=Month;
        }
    
        public String getYear(){
            return Year;
        }
    
        public String getMonth(){
            return Month;
        }
    }
    
    
    
    public class dateArray extends ArrayAdapter<dateString>{
    
        private int resourceID;
        Context con;
        List<dateString> datestrings;
    
    
    
    
        public dateArray(Context context, int ResourceID, List<dateString> object){
            super(context,ResourceID,object);
            resourceID=ResourceID;
            con=context;
            datestrings=object;
        }
    
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
    
            dateString ds=getItem(position);
            //LayoutInflater _LayoutInflater=LayoutInflater.from(con);
            //convertView=_LayoutInflater.inflate(resourceID, null);
            convertView= LayoutInflater.from(getContext()).inflate(resourceID,parent,false);
            if(convertView!=null){
                TextView year=(TextView)convertView.findViewById(R.id.nsd_sp_year);
                TextView month=(TextView)convertView.findViewById(R.id.nsd_sp_month);
                year.setText(ds.getYear());
                month.setText(ds.getMonth());
                Toast.makeText(getContext(),ds.getYear()+"."+ds.getMonth(),Toast.LENGTH_SHORT).show();
    
            }
    
            return convertView;
        }
    
        @Override
        public View getDropDownView(int position,View convertView,ViewGroup parent) {
            return super.getDropDownView(position, convertView, parent);
        }
    }
    
    
    
    
    public class dateArray extends BaseAdapter{
    
        Context c;
        List<dateString> d;
    
        public dateArray(Context context,List<dateString> datelist){
            c=context;
            d=datelist;
        }
    
        @Override
        public int getCount() {
            return d.size();
        }
    
        @Override
        public Object getItem(int position) {
            return d.get(position);
        }
    
        @Override
        public long getItemId(int position) {
            return position;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater _LayoutInflater=LayoutInflater.from(c);
            convertView=_LayoutInflater.inflate(R.layout.nsd_spinner, null);
            if(convertView!=null)
            {
                TextView _TextView1=(TextView)convertView.findViewById(R.id.nsd_sp_year);
                TextView _TextView2=(TextView)convertView.findViewById(R.id.nsd_sp_month);
                _TextView1.setText(d.get(position).getYear());
                _TextView2.setText(d.get(position).getMonth());
            }
            return convertView;
        }
    }

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/nsd_sp_year"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="年"/>
        <TextView
            android:id="@+id/nsd_sp_month"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="月"/>
    
    </LinearLayout>

为把年月显示在Spinner上，重写了ArrayAdapter总是在下拉时出错，没发现问题。改用BaseAdapter后，功能就实现了，但ArrayAdapter是继承的BaseAdapter的啊？真奇怪。