使适配器更加简单

   传统写法

   

public class CustomerAdapter extends BaseAdapter {

	 private List<CustomerInfo> mCustomerList;
	 private LayoutInflater mInflater;
	 private Context context;
	 public CustomerAdapter(Context context, List<CustomerInfo> customerList)
	 {
		 mCustomerList = customerList;
		 mInflater = LayoutInflater.from(context);
		 this.context = context;
	 }
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		if(mCustomerList == null){
			return 0;
		}
		
		return mCustomerList.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
         ViewHolder holder=null;
		if(convertView == null)
		{
			convertView =mInflater.inflate(R.layout.customer_item, null);
			holder = new ViewHolder();
			holder.tele=(TextView) convertView.findViewById(R.id.tv_tel);
			holder.details=(TextView) convertView.findViewById(R.id.tv_write);
			holder.time=(TextView) convertView.findViewById(R.id.tv_time);
			convertView.setTag(holder);
		}
		else
		{
			holder = (ViewHolder) convertView.getTag();
		}
		holder.tele.setText(mCustomerList.get(position).getCustomerTel());
		holder.details.setText(mCustomerList.get(position).getCustomerDetails());
		holder.time.setText(mCustomerList.get(position).getCustomerTime());
		return convertView;
	}


	public class ViewHolder
	{	
		
	    public TextView tele;
	    public TextView details;
	    public TextView time;
	   
	}
}

  改进版本一

  将ViewHolder作为一个通用的类

   SparseArray   //比传统Hashmap更加有效率  map<int,object>这种情况下

  

public View getView(int position, View convertView, ViewGroup parent) {
	
		ViewHolder holder = ViewHolder.get(mContext,convertView,parent,R.layout.item,position);
		CustomInfo a=mCustomerList.get(position);
		((TextView)holder.getView(R.id.tele)).setText(a.getTele());
		((TextView)holder.getView(R.id.details)).setText(a.getDetails());
		((TextView)holder.getView(R.id.time)).setText(a.getTime());
		return holder.getConvertView();
	}

public class ViewHolder {
    private SparseArray<View> mViews;
    private int mPosition;
    private View mConvertView;
    
    public ViewHolder(Context context,ViewGroup parent,int layoutId,int position)
    {
    	this.mPosition=position;
    	this.mViews = new SparseArray<View>();
    	mConvertView=LayoutInflater.from(context).inflate(layoutId, parent,false);
    	mConvertView.setTag(this);
    	
    }
    /**
     * 入口方法
     */
    public static ViewHolder get(Context context,View convertView,ViewGroup parent,int layoutId,int position)
    {
    	if(convertView == null)
    	{
    		return new ViewHolder(context, parent, layoutId, position);
    	}
    	else
    	{
    	    ViewHolder holder = (ViewHolder) convertView.getTag();//convertView复用
    	    holder.mPosition = position;   //position需要不断变化
    	    return holder;
    	}
    }
    /**
    *返回ConvertView
    */
    public View getConvertView()
    {
    	return mConvertView;
    }
    /**
     * 通过viewId获取控件
     */
    public <T extends View> T getView(int viewId)
    {
    	View view = mViews.get(viewId);
    	if(view == null)
    	{
    		view = mConvertView.findViewById(viewId);
    		mViews.put(viewId, view);
    	}
    	return (T) view; 
    }    
}

改进版本2

封装adapter

 

public abstract class CommonAdapter<T> extends BaseAdapter {

	public Context mContext;
	public List<T> mDatas;
	public LayoutInflater mInflater;
	
	public CommonAdapter(Context context , List<T> datas)
	{
		this.mContext = context;
		mInflater = LayoutInflater.from(context);
		this.mDatas = datas;
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return mDatas.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return mDatas.get(location);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public abstract View getView(int position, View convertView, ViewGroup parent);
}

public class Myadapter extends CommonAdapter<CustomInfo> {

	 public CustomerAdapter(Context context, List<CustomerInfo> customerList)
	 {
		super(context,customerList);
	 }
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	
		ViewHolder holder = ViewHolder.get(mContext,convertView,parent,R.layout.item,position);
		CustomInfo a=mCustomerList.get(position);
		((TextView)holder.getView(R.id.tele)).setText(a.getTele());
		((TextView)holder.getView(R.id.details)).setText(a.getDetails());
		((TextView)holder.getView(R.id.time)).setText(a.getTime());
		return holder.getConvertView();
	}
}

再改进

public abstract class CommonAdapter<T> extends BaseAdapter {

	public Context mContext;
	public List<T> mDatas;
	public LayoutInflater mInflater;
	
	public CommonAdapter(Context context , List<T> datas)
	{
		this.mContext = context;
		mInflater = LayoutInflater.from(context);
		this.mDatas = datas;
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return mDatas.size();
	}

	@Override
	public T getItem(int position) {
		// TODO Auto-generated method stub
		return mDatas.get(location);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent)
	{
		ViewHolder holder = ViewHolder.get(mContext,convertView,parent,R.layout.item,position);
        
		convert(holder,getItem(position));
		
		return holder.getConvertView();
	}
	private abstract void convert(ViewHolder holder, T t);
}

public class Myadapter extends CommonAdapter<CustomInfo> {

	 public CustomerAdapter(Context context, List<CustomerInfo> customerList)
	 {
		super(context,customerList);
	 }
	 public void convert(ViewHolder holder,CustomInfo t)
	 {
		 ((TextView)holder.getView(R.id.tele)).setText(a.getTele());
		 ((TextView)holder.getView(R.id.details)).setText(a.getDetails());
		 ((TextView)holder.getView(R.id.time)).setText(a.getTime());
	 }
}

再次小改进

ViewHolder类中

添加设置TextView的方法

public ViewHolder setText(int viewId,String text)

{

     TextView tv=getView(viewId);

     tv.setText(text);

     return this;

}

Adapter中使用链式进一步简化代码量

  holder.setText(,).setText.(,).setText(,);

MyaAdapter可以直接声明为内部类，减少代码量

mListView.setAdapter(new CommonAdapter<CustomInfo>(MainActivity.this,mDatas)

{

    public void convert(ViewHolder holder,CustomInfo t)

    {

          public class Myadapter extends CommonAdapter<CustomInfo> {


public CustomerAdapter(Context context, List<CustomerInfo> customerList)
{
super(context,customerList);
}
public void convert(ViewHolder holder,CustomInfo t)
{
((TextView)holder.getView(R.id.tele)).setText(a.getTele());
((TextView)holder.getView(R.id.details)).setText(a.getDetails());
((TextView)holder.getView(R.id.time)).setText(a.getTime());
}
}

    }

});

点击item没反应解决方法

1.focusable = false;//防止焦点被抢

2.descendantFocusablility="blockDescendants"//禁止焦点往下传递

conVertView复用出现的问题解决

 private boolean ischecked;

private List<Integer> mPos = new ArrayList<Integer>();去记录点击的状态

final CheckBox cb = holder.getView(R.id......);

cb.setChecked(false);

if(mPos.contains(holder.getPosition()))

{

      cb.setChecked(true);

}

cb.setOnClickListener(new OnClickListener()

      public void onClick(View v)

      {

            mPos.add(holder.getPositon());

      }else

     {

           mPos.remove((Integer)holder.getPosition());

     }

);