BaseAdapter日常的封裝

我們日常開發中BaseAdapter使用非常的多，大家有沒有想過，再進一步封裝，將平常使用的對象集合，利用泛型放入集合中，再也不用每次都重寫那幾個方法了，當然我也提供我的下載地址(https://github.com/androidsihai1/BaseAdapterDemo)

 1 package com.example.administrator.mybaseadapter;
 2 
 3 import android.content.Context;
 4 import android.widget.TextView;
 5 
 6 
 7 
 8 public class MyAdapter extends BaseAdapter {
 9 
10     public MyAdapter(Context context) {
11         super(context);
12     }
13 
14 
15     @Override
16     public int getItemViewType(int position) {
17         return 0;
18     }
19 
20     @Override
21     public int getItemLayoutId(int getItemViewType) {
22         return R.layout.item_layout;
23     }
24 
25     @Override
26     public void handleItem(int itemViewType, int position, Object item, ViewHolder holder, boolean isRecycle) {
27         TextView leftTv = holder.get(R.id.left_tv, TextView.class);
28         TextView righTv = holder.get(R.id.right_tv, TextView.class);
29         Book book = (Book) item;
30         leftTv.setText(book.id + "");
31         righTv.setText(book.name);
32     }
33 
34 
35 }

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);
    }

}

1 package com.example.administrator.mybaseadapter;
2 
3 
4 
5 public class Book {
6    public int id;
7     public String name;
8 }

  1 package com.example.administrator.mybaseadapter;
  2 
  3 import android.content.Context;
  4 import android.util.SparseArray;
  5 import android.view.LayoutInflater;
  6 import android.view.View;
  7 import android.view.ViewGroup;
  8 
  9 import java.util.ArrayList;
 10 import java.util.List;
 11 
 12 /**
 13  * Created by [email protected] on 2016/11/15.
 14  */
 15 
 16 public abstract class BaseAdapter<T> extends android.widget.BaseAdapter {
 17 
 18     protected Context mContext;
 19     protected List<T> mData = new ArrayList<T>();
 20     LayoutInflater mInflater;
 21 
 22     public BaseAdapter(Context context) {
 23         this.mContext = context;
 24         mInflater = LayoutInflater.from(context);
 25     }
 26 
 27     final public void setData(List<T> list) {
 28         this.mData = list;
 29     }
 30 
 31    final public List<T> getData() {
 32         return mData;
 33     }
 34 
 35 
 36     @Override
 37     final public int getCount() {
 38         return mData.size();
 39     }
 40 
 41     @Override
 42     public T getItem(int i) {
 43         return mData.get(i);
 44     }
 45 
 46     @Override
 47     final public long getItemId(int i) {
 48         return i;
 49     }
 50 
 51     public abstract   int getItemViewType(int position);
 52     public abstract int getItemLayoutId(int getItemViewType);
 53     public abstract void handleItem(int itemViewType , int position , T item , ViewHolder holder , boolean isRecycle);
 54     @Override
 55     public View getView(int position, View view, ViewGroup viewGroup) {
 56         int itemLayoutType = getItemViewType(position);
 57         ViewHolder viewHolder = null;
 58         boolean isRecycle =false;
 59         if(view == null) {
 60             view =  mInflater.inflate(getItemLayoutId(itemLayoutType) , null);
 61             viewHolder = new ViewHolder(view);
 62             view.setTag(viewHolder);
 63         } else {
 64             viewHolder = (ViewHolder) view.getTag();
 65             isRecycle = true;
 66         }
 67         handleItem(itemLayoutType , position ,mData.get(position) , viewHolder , isRecycle);
 68         return view;
 69     }
 70 
 71     public static  class ViewHolder{
 72         View mRootView;
 73         SparseArray<View> mViews = new SparseArray<View>();
 74         public ViewHolder(View view) {
 75             this.mRootView = view;
 76         }
 77 
 78         public View getView() {
 79             return mRootView;
 80         }
 81 
 82         public <T extends  View> T get(int viewId) {
 83             View childView = mViews.get(viewId);
 84             if(childView == null) {
 85                 childView = mRootView.findViewById(viewId);
 86                 mViews.put(viewId , childView);
 87             }
 88             return (T)childView;
 89         }
 90 
 91         public <T extends  View> T get(int viewId , Class<T> viewClass) {
 92             View childView = mViews.get(viewId);
 93             if(childView == null) {
 94                 childView = mRootView.findViewById(viewId);
 95                 mViews.put(viewId , childView);
 96             }
 97             return (T) childView;
 98         }
 99 
100     }
101 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:id="@+id/activity_main"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context="com.example.administrator.mybaseadapter.MainActivity">
 8 
 9         <ListView
10             android:id="@+id/lv"
11             android:layout_width="match_parent"
12             android:layout_height="match_parent" />
13 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="horizontal" android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5 
 6     <TextView
 7         android:text="TextView"
 8         android:layout_width="wrap_content"
 9         android:layout_height="wrap_content"
10         android:id="@+id/left_tv"
11         android:layout_weight="1" />
12 
13     <TextView
14         android:text="TextView"
15         android:layout_width="wrap_content"
16         android:layout_height="wrap_content"
17         android:id="@+id/right_tv"
18         android:layout_weight="1" />
19 </LinearLayout>