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 pengsihai@yy.com 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>