Android自定义通用适配器

BaseAdapter：getCount() getItem() getItemId() 基本都是固定的写法，每次都这样写，所以我们可以将他们写到父类中固定下来，以后不必再写；getView()中两种优化的方法和流程是固定的，我们也可以把这些优化的代码固定下来，只留下需要每次修改的部分让子类实现即可。 
根据以往我们写过的适配器： 
每次编写Adapter会变化的部分：1.ViewHolder装载具体的控件。2.加载数据。 
1. 通用适配器MyBaseAdapter.java

package com.example.zhaoxin.commonbaseadapter.adapter;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import java.util.List;/** * Created by zhaoxin on 17/11/23. * 自定义通用适配器 */public abstract class MyBaseAdapter<T, E extends MyBaseAdapter.ViewHolder> extends BaseAdapter{    // 数据    private List<T> entityList;    // 界面    private int resourceId;    // 上下文    private Context context;    public MyBaseAdapter(Context context, int resourceId, List<T> entityList){        this.context = context;        this.resourceId = resourceId;        this.entityList = entityList;    }    @Override    public int getCount() {        return entityList.size();    }    @Override    public Object getItem(int position) {        return entityList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View view, ViewGroup viewGroup) {        if (null == view){            // 新建视图            view = LayoutInflater.from(context).inflate(resourceId, null);            // 完成ViewHolder            E holder = createViewHolder(view);            // 保存ViewHolder            view.setTag(holder);        }        // 获取ViewHolder        E holder = (E)view.getTag();        // 获取数据        T entity = (T) getItem(position);        // 绑定数据        bindDataAndView(holder, entity);        return view;    }    /**     * 创建ViewHolder     * @param convertView     * @return 自己定义的ViewHolder     */    public abstract E createViewHolder(View convertView);    /**     * 绑定数据到界面     * @param holder 自定义的viewHolder     * @param data     */    public abstract void bindDataAndView(E holder, T data);    /**     * 子类viewholder必须继承     */    public static abstract class ViewHolder{    }}
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1. 自定义适配器继承通用适配器MyListViewAdapter.java

package com.example.zhaoxin.commonbaseadapter.adapter;import android.content.Context;import android.view.View;import android.widget.TextView;import com.example.zhaoxin.commonbaseadapter.R;import com.example.zhaoxin.commonbaseadapter.entity.Book;import java.util.List;/** * Created by zhaoxin on 17/11/23. * ListView适配器 */public class MyListViewAdapter extends MyBaseAdapter<Book, MyListViewAdapter.BookViewHolder> {    public MyListViewAdapter(Context context, int resourceId, List<Book> bookList) {        super(context, resourceId, bookList);    }    @Override    public BookViewHolder createViewHolder(View convertView) {        BookViewHolder holder = new BookViewHolder();        // 获取视图        holder.tv_book_name = convertView.findViewById(R.id.tv_book_name);        holder.tv_book_price = convertView.findViewById(R.id.tv_book_price);        return holder;    }    @Override    public void bindDataAndView(BookViewHolder holder, Book data) {        // 为列表项设置数据        holder.tv_book_name.setText(data.getBookName());        holder.tv_book_price.setText(data.getBookPrice());    }    class BookViewHolder extends MyBaseAdapter.ViewHolder{        // View        TextView tv_book_name;        TextView tv_book_price;    }}
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1. MainActivity.java

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package com.example.zhaoxin.commonbaseadapter;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.ListView;import com.example.zhaoxin.commonbaseadapter.adapter.MyListViewAdapter;import com.example.zhaoxin.commonbaseadapter.entity.Book;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ListView listView;// View    private List<Book> bookList;// 图书集合    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 获取listView组件        listView = (ListView) findViewById(R.id.list);        // 获取图书集合对象        bookList = new ArrayList<>();        // 循环添加集合数据        for (int i = 0; i < 10; i++) {            Book book = new Book("Android", "45");            bookList.add(book);        }        // 为组件设置适配器展示数据        listView.setAdapter(new MyListViewAdapter(this, R.layout.item_list, bookList));    }}
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1. 实体类 Book.java

package com.example.zhaoxin.commonbaseadapter.entity;/** * Created by zhaoxin on 17/11/23. * 图书实体类 */public class Book {    private String bookName;    private String bookPrice;    public Book(){}    public Book(String bookName, String bookPrice) {        this.bookName = bookName;        this.bookPrice = bookPrice;    }    public String getBookName() {        return bookName;    }    public void setBookName(String bookName) {        this.bookName = bookName;    }    public String getBookPrice() {        return bookPrice;    }    public void setBookPrice(String bookPrice) {        this.bookPrice = bookPrice;    }}
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1. 主页面布局 activity_main.java

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ListView        android:id="@+id/list"        android:layout_width="match_parent"        android:layout_height="match_parent">    </ListView></LinearLayout>
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1. 列表项布局 item_list.java

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:id="@+id/tv_book_name"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/tv_book_price"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>
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