android之ListView与Adapter(结合JavaBean)

ListView

<ListView
　　android:id="@+id/lv"
　　android:layout_width="match_parent"
　　android:layout_height="match_parent" />

item_list.xml

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

    <TextView
        android:id="@+id/item"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:gravity="center_vertical"
        tools:text="2015年10月22日 周四" />

</LinearLayout>

适配器MyAdapter继承基类MyBaseAdapter（WeekBean查看android日期工具类）

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.xh.boke.R;
import com.xh.boke.base.BaseActivity;
import com.xh.boke.base.MyBaseAdapter;
import com.xh.boke.bean.WeekBean;
import com.xh.boke.holder.ViewHolder;
import java.util.List;

/**
 * 测试Adapter
 * Created by Administrator on 2015/10/22 0022.
 */
public class MyAdapter extends MyBaseAdapter<WeekBean> {
    private TextView tv;

    public MyAdapter(BaseActivity context, List<WeekBean> list) { super(context, list); }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, null);
        try {
            tv = ViewHolder.get(convertView, R.id.item);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        WeekBean bean = datas.get(position);
        tv.setText(bean.year+"年"+bean.month+"月"+bean.day+"日"+"\t"+bean.weeks);
        return convertView;
    }
}

功能优化之ViewHolder类

/**
 * view临时存储器
 * Created by Administrator on 2015/10/22 0022.
 */
import android.util.SparseArray;
import android.view.View;

public class ViewHolder {
    /**
     * 获取参数convertView中的指定id资源
     * @param convertView 实例化之后的convertView，不为空指针
     * @param id 指定id资源
     * @return 在convertView中的与id对应的view
     * @throws IllegalAccessException 当convertView为空时，抛出
     */
    @SuppressWarnings("unchecked")
    public static <T extends View> T get(View convertView, int id) throws IllegalAccessException {
        if(convertView == null)
            throw new IllegalAccessException("convertView can not be null");

        SparseArray<View> viewHolder = (SparseArray<View>) convertView.getTag();
        if (viewHolder == null) {
            viewHolder = new SparseArray<View>();
            convertView.setTag(viewHolder);
        }
        View childView = viewHolder.get(id);
        if (childView == null) {
            childView = convertView.findViewById(id);
            viewHolder.put(id, childView);
        }
        return (T) childView;
    }
}

在activity中使用

ListView lv = (ListView) findViewById(R.id.lv);
List<WeekBean> list = getWeekDate();//查看android日期工具类
MyAdapter adapter = new MyAdapter(this,list);
lv.setAdapter(adapter);