适配器基类--万能适配器（BaseAdapter）

一个抽象类继承BaseAdapter

package com.lei.adapter;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public abstract class MyBaseAdapter<T> extends android.widget.BaseAdapter {private List<T> data = new ArrayList<T>();private Context context;private int layoutId;public MyBaseAdapter(Context context, int layoutId, List<T> datas) {this(context, layoutId);this.data = datas;}public MyBaseAdapter(Context context, int layoutId) {this.context = context;this.layoutId = layoutId;}public int getCount() {return data.size();}public T getItem(int position) {return data.get(position);}public long getItemId(int position) {return position;}public View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = ViewHolder.newInstance(context, convertView,layoutId, parent, position);setViewDetails(holder, getItem(position));return holder.getConvertView();}<span style="white-space:pre"></span>//要实现的抽象方法，具体为控件赋值public abstract void setViewDetails(ViewHolder holder, T data);}

ViewHolder

根据自己需求，增加一些方法

package com.lei.adapter;import android.content.Context;import android.graphics.Bitmap;import android.util.SparseArray;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;public class ViewHolder {private View mContentView;private SparseArray<View> mViews;// 装控件private int mPosition;private Context context;public static ViewHolder newInstance(Context context, View convertView,int layoutId, ViewGroup group, int position) {ViewHolder holder = null;if (convertView == null) {holder = new ViewHolder(context, layoutId, group, position);} else {holder = (ViewHolder) convertView.getTag();holder.mPosition = position;}return holder;}private ViewHolder(Context context, int layoutId, ViewGroup group,int position) {this.context = context;mViews = new SparseArray<View>();this.mPosition = position;mContentView = LayoutInflater.from(context).inflate(layoutId, group,false);mContentView.setTag(this);}public <T extends View> T getViewById(int resId) {View view = mViews.get(resId);if (null == view) {view = mContentView.findViewById(resId);mViews.put(resId, view);}return (T) view;}/** * 为textview设置内容 *  * @param resId * @param text */public void setTextForTv(int resId, String text) {TextView tv = getViewById(resId);tv.setText(text);}/** * 设置文字颜色 *  * @param resId * @param colorId */public void setTextColor(int resId, int colorId) {TextView tv = getViewById(resId);tv.setTextColor(colorId);}public void setImageResource(int resId, int imgId) {ImageView img = getViewById(resId);img.setImageResource(imgId);}public void setImageBitmap(int resId, Bitmap bitmap) {ImageView img = getViewById(resId);img.setImageBitmap(bitmap);if (null != bitmap) {bitmap.recycle();}}public View getConvertView() {return mContentView;}public int getPosition() {return mPosition;}}

下面是一个Demo

package com.lei.vpdemo;import java.util.ArrayList;import java.util.List;import android.app.ListActivity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Toast;import com.lei.adapter.MyBaseAdapter;import com.lei.adapter.ViewHolder;public class MyListAct extends ListActivity {List<String> mData;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);initData();ListAdapter adapter = new ListAdapter(this,android.R.layout.simple_list_item_multiple_choice, mData);setListAdapter(adapter);}private void initData() {mData = new ArrayList<String>();mData.add("JAVA");mData.add("Android");mData.add("浪潮之巅");mData.add("疯狂讲义");}

<span style="white-space:pre"></span>//adapter 实现类，只需要实现它的抽象方法和构造函数

public class ListAdapter extends MyBaseAdapter<String> {Context context;public ListAdapter(Context context, int layoutId, List<String> datas) {super(context, layoutId, datas);this.context = context;}// 回调，为item赋值@Overridepublic void setViewDetails(ViewHolder holder, final String data) {holder.setTextForTv(android.R.id.text1, data);//通过个体position为item设置个性化if (holder.getPosition() == 2) {holder.setTextColor(android.R.id.text1, Color.GREEN);}if (holder.getPosition() == 3) {holder.getViewById(android.R.id.text1).setOnClickListener(new OnClickListener() {public void onClick(View v) {Toast.makeText(context, data, Toast.LENGTH_LONG).show();}});}}}}

效果图如下：