BaseAdapter日常的封装

我们日常开发中BaseAdapter使用非常的多，大家有没有想过，再进一步封装，将平常使用的对象集合，利用泛型放入集合中，再也不用每次都重写那几个方法了，当然我也提供我的下载地址(https://github.com/androidsihai1/BaseAdapterDemo)

 package com.example.administrator.mybaseadapter;

 import android.content.Context;

 import android.widget.TextView;

 public class MyAdapter extends BaseAdapter {

     public MyAdapter(Context context) {

         super(context);

     }

     @Override

     public int getItemViewType(int position) {

         return 0;

     }

     @Override

     public int getItemLayoutId(int getItemViewType) {

         return R.layout.item_layout;

     }

     @Override

     public void handleItem(int itemViewType, int position, Object item, ViewHolder holder, boolean isRecycle) {

         TextView leftTv = holder.get(R.id.left_tv, TextView.class);

         TextView righTv = holder.get(R.id.right_tv, TextView.class);

         Book book = (Book) item;

         leftTv.setText(book.id + "");

         righTv.setText(book.name);

     }

 }

package com.example.administrator.mybaseadapter;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.ListView;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    List<Book> mList = new ArrayList<Book>();

    ListView mLv ;

    BaseAdapter<Book> mAdapter;

    int k = 0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mLv = findView(R.id.lv);

        for(int i = 0 ; i < 50 ; i++) {

            Book book = new Book();

            k++;

            book.id = k;

            book.name = "name " + k;

            mList.add(book);

        }

        mAdapter = new MyAdapter(this);

        mAdapter.setData(mList);

        mLv.setAdapter(mAdapter);

        mAdapter.notifyDataSetChanged();

    }

    public <T extends View> T findView(int viewId) {

        return  (T)findViewById(viewId);

    }

}

 package com.example.administrator.mybaseadapter;

 public class Book {

    public int id;

     public String name;

 }

 package com.example.administrator.mybaseadapter;

 import android.content.Context;

 import android.util.SparseArray;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Created by [email protected] on 2016/11/15.

  */

 public abstract class BaseAdapter<T> extends android.widget.BaseAdapter {

     protected Context mContext;

     protected List<T> mData = new ArrayList<T>();

     LayoutInflater mInflater;

     public BaseAdapter(Context context) {

         this.mContext = context;

         mInflater = LayoutInflater.from(context);

     }

     final public void setData(List<T> list) {

         this.mData = list;

     }

    final public List<T> getData() {

         return mData;

     }

     @Override

     final public int getCount() {

         return mData.size();

     }

     @Override

     public T getItem(int i) {

         return mData.get(i);

     }

     @Override

     final public long getItemId(int i) {

         return i;

     }

     public abstract   int getItemViewType(int position);

     public abstract int getItemLayoutId(int getItemViewType);

     public abstract void handleItem(int itemViewType , int position , T item , ViewHolder holder , boolean isRecycle);

     @Override

     public View getView(int position, View view, ViewGroup viewGroup) {

         int itemLayoutType = getItemViewType(position);

         ViewHolder viewHolder = null;

         boolean isRecycle =false;

         if(view == null) {

             view =  mInflater.inflate(getItemLayoutId(itemLayoutType) , null);

             viewHolder = new ViewHolder(view);

             view.setTag(viewHolder);

         } else {

             viewHolder = (ViewHolder) view.getTag();

             isRecycle = true;

         }

         handleItem(itemLayoutType , position ,mData.get(position) , viewHolder , isRecycle);

         return view;

     }

     public static  class ViewHolder{

         View mRootView;

         SparseArray<View> mViews = new SparseArray<View>();

         public ViewHolder(View view) {

             this.mRootView = view;

         }

         public View getView() {

             return mRootView;

         }

         public <T extends  View> T get(int viewId) {

             View childView = mViews.get(viewId);

             if(childView == null) {

                 childView = mRootView.findViewById(viewId);

                 mViews.put(viewId , childView);

             }

             return (T)childView;

         }

         public <T extends  View> T get(int viewId , Class<T> viewClass) {

             View childView = mViews.get(viewId);

             if(childView == null) {

                 childView = mRootView.findViewById(viewId);

                 mViews.put(viewId , childView);

             }

             return (T) childView;

         }

     }

 }

 <?xml version="1.0" encoding="utf-8"?>

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:id="@+id/activity_main"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="com.example.administrator.mybaseadapter.MainActivity">

         <ListView

             android:id="@+id/lv"

             android:layout_width="match_parent"

             android:layout_height="match_parent" />

 </RelativeLayout>

 <?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="match_parent">

     <TextView

         android:text="TextView"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:id="@+id/left_tv"

         android:layout_weight="1" />

     <TextView

         android:text="TextView"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:id="@+id/right_tv"

         android:layout_weight="1" />

 </LinearLayout>