高灵活低耦合Adapter快速开发攻略

Android开发中经常需要使用Adapter。

传统方法是自定义一个Adapter并继承AndroidSDK内的BaseAdapter，

这种方式代码量大，耦合度高，灵活性差(各种监听事件需要对View单独写，或者自定义一个比较统一的方法)；

而ZBLibrary中的BaseViewAdapter不仅预处理了通用方法(getCount,getItem等) 以及 Item复用逻辑，

而且将对Item的处理代码单独写在一个BaseView(提供了大量常用方法)的子类，

所以使用继承BaseViewAdapter的新方式能大幅精简代码，并且带来高灵活性和低耦合度。

比如这个界面

传统方式实现的CommonAdapter代码如下

 package com.example.quickadapter;

 import java.util.ArrayList;
 import java.util.List;

 import zuo.biao.library.ui.WebViewActivity;
 import zuo.biao.library.util.ImageLoaderUtil;
 import android.app.Activity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;

 public class CommonAdapter extends BaseAdapter {

     private Activity context;
     private List<User> list;
     private LayoutInflater inflater;
     public CommonAdapter(Activity context, List<User> list) {
         this.context = context;
         this.list = new ArrayList<>(list);
         this.inflater = context.getLayoutInflater();
     }

     @Override
     public int getCount() {
         return list.size();
     }

     @Override
     public User getItem(int position) {
         return list.get(position);
     }

     @Override
     public long getItemId(int position) {
         return position;
     }

     public synchronized void refresh(List<User> list) {
         if (list != null && list.size() > 0) {
             this.list = new ArrayList<>(list);
         }
         notifyDataSetChanged();
     }

     @Override
     public View getView(final int position, View convertView, ViewGroup parent) {
         ViewHolder holder = convertView == null ? null : (ViewHolder) convertView.getTag();
         if (holder == null) {
             convertView = inflater.inflate(R.layout.user_item, parent, false);
             holder = new ViewHolder();

             holder.ivUserItemHead = (ImageView) convertView.findViewById(R.id.ivUserItemHead);
             holder.ivUserItemStar = (ImageView) convertView.findViewById(R.id.ivUserItemStar);

             holder.tvUserItemSex = (TextView) convertView.findViewById(R.id.tvUserItemSex);

             holder.tvUserItemName = (TextView) convertView.findViewById(R.id.tvUserItemName);
             holder.tvUserItemId = (TextView) convertView.findViewById(R.id.tvUserItemId);
             holder.tvUserItemNumber = (TextView) convertView.findViewById(R.id.tvUserItemNumber);

             convertView.setTag(holder);
         }

         final User user = getItem(position);

         ImageLoaderUtil.loadImage(holder.ivUserItemHead, user.getHead(), ImageLoaderUtil.TYPE_OVAL);
         holder.ivUserItemStar.setImageResource(user.getStarred() ? R.drawable.star_light : R.drawable.star);

         holder.tvUserItemSex.setBackgroundResource(user.getSex() == User.SEX_FEMAIL ? R.drawable.circle_pink : R.drawable.circle_blue);
         holder.tvUserItemSex.setText(user.getSex() == User.SEX_FEMAIL ?  "女" : "男");
         holder.tvUserItemSex.setTextColor(context.getResources().getColor(user.getSex() == User.SEX_FEMAIL ? R.color.pink : R.color.blue));

         holder.tvUserItemName.setText("" + user.getName());
         holder.tvUserItemId.setText("ID:" + user.getId());
         holder.tvUserItemNumber.setText("Phone:" + user.getPhone());

         holder.ivUserItemHead.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 context.startActivity(WebViewActivity.createIntent(context, user.getName(), user.getHead()));
             }
         });

         holder.ivUserItemStar.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 user.setStarred(! user.getStarred());
                 list.set(position, user);
                 refresh(null);
             }
         });

         holder.tvUserItemSex.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 user.setSex(user.getSex() == User.SEX_FEMAIL ? User.SEX_MAIL : User.SEX_FEMAIL);
                 list.set(position, user);
                 refresh(null);
             }
         });

         return convertView;
     }

     class ViewHolder {
         public ImageView ivUserItemHead;
         public ImageView ivUserItemStar;

         public TextView tvUserItemSex;

         public TextView tvUserItemName;
         public TextView tvUserItemId;
         public TextView tvUserItemNumber;
     }
 }

继承BaseViewAdapter的新方式实现的QuickAdapter代码如下

 package com.example.quickadapter;

 import java.util.List;

 import zuo.biao.library.base.BaseView;
 import zuo.biao.library.base.BaseViewAdapter;
 import zuo.biao.library.ui.WebViewActivity;
 import zuo.biao.library.util.ImageLoaderUtil;
 import zuo.biao.library.util.StringUtil;
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.res.Resources;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;

 import com.example.quickadapter.QuickAdapter.UserView;

 public class QuickAdapter extends BaseViewAdapter<User, UserView> {

     public QuickAdapter(Activity context, List<User> list) {
         super(context, list);
     }

     @Override
     public UserView createView(int position, View convertView, ViewGroup parent) {
         return new UserView(context, resources);
     }

     public class UserView extends BaseView<User> implements OnClickListener {
         public UserView(Activity context, Resources resources) {
             super(context, resources);
         }

         public ImageView ivUserViewHead;
         public ImageView ivUserViewStar;

         public TextView tvUserViewSex;

         public TextView tvUserViewName;
         public TextView tvUserViewId;
         public TextView tvUserViewNumber;
         @SuppressLint("InflateParams")
         @Override
         public View createView(LayoutInflater inflater) {
             convertView = inflater.inflate(R.layout.user_view, null);

             ivUserViewHead = findViewById(R.id.ivUserViewHead, this);
             ivUserViewStar = findViewById(R.id.ivUserViewStar, this);

             tvUserViewSex = findViewById(R.id.tvUserViewSex, this);

             tvUserViewName = findViewById(R.id.tvUserViewName);
             tvUserViewId = findViewById(R.id.tvUserViewId);
             tvUserViewNumber = findViewById(R.id.tvUserViewNumber);

             return convertView;
         }

         @Override
         public void setView(User data){
             if (data == null) {
                 return;
             }
             this.data = data;

             ImageLoaderUtil.loadImage(ivUserViewHead, data.getHead(), ImageLoaderUtil.TYPE_OVAL);
             ivUserViewStar.setImageResource(data.getStarred() ? R.drawable.star_light : R.drawable.star);

             tvUserViewSex.setBackgroundResource(data.getSex() == User.SEX_FEMAIL ? R.drawable.circle_pink : R.drawable.circle_blue);
             tvUserViewSex.setText(data.getSex() == User.SEX_FEMAIL ?  "女" : "男");
             tvUserViewSex.setTextColor(getColor(data.getSex() == User.SEX_FEMAIL ? R.color.pink : R.color.blue));

             tvUserViewName.setText(StringUtil.getTrimedString(data.getName()));
             tvUserViewId.setText("ID:" + data.getId());
             tvUserViewNumber.setText("Phone:" + StringUtil.getNoBlankString(data.getPhone()));
         }

         @Override
         public void onClick(View v) {
             if (data == null) {
                 return;
             }
             switch (v.getId()) {
             case R.id.ivUserViewHead:
                 toActivity(WebViewActivity.createIntent(context, data.getName(), data.getHead()));
                 break;
             case R.id.ivUserViewStar:
                 data.setStarred(! data.getStarred());
                 setView(data);
                 break;
             case R.id.tvUserViewSex:
                 data.setSex(data.getSex() == User.SEX_FEMAIL ? User.SEX_MAIL : User.SEX_FEMAIL);
                 setView(data);
                 break;
             default:
                 break;
             }
         }
     }
 }

看下ZBLibrary中的BaseView，里面有大量常用的 且 AndroidSDK内的BaseAdapter没有提供的 方法。

package zuo.biao.library.base;

import zuo.biao.library.util.CommonUtil;
import zuo.biao.library.util.Log;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.View.OnTouchListener;

/**基础自定义View
 * @author Lemon
 * @param <T> 数据模型(model/JavaBean)类
 * @see #onDestroy
 * @use extends BaseView<T>, 具体参考.DemoView
 */
public abstract class BaseView<T> {
    private static final String TAG = "BaseView";

    /**
     * 传入的Activity,可在子类直接使用
     */
    protected Activity context;
    protected Resources resources;
    public BaseView(Activity context, Resources resources) {
        this.context = context;
        this.resources = resources == null ? context.getResources() : resources;
    }

    /**数据改变回调接口
     * (Object) getData() - 改变的数据
     */
    public interface OnDataChangedListener {
        void onDataChanged();
    }

    public OnDataChangedListener onDataChangedListener;//数据改变回调监听类的实例
    /**设置数据改变事件监听类
     * @param l
     */
    public void setOnDataChangedListener(OnDataChangedListener l) {
        onDataChangedListener = l;
    }

    public OnTouchListener onTouchListener;//接触View回调监听类的实例
    /**设置接触View事件监听类
     * @param l
     */
    public void setOnTouchListener(OnTouchListener l) {
        onTouchListener = l;
    }

    public OnClickListener onClickListener;//点击View回调监听类的实例
    /**设置点击View事件监听类
     * @param l
     */
    public void setOnClickListener(OnClickListener l) {
        onClickListener = l;
    }

    public OnLongClickListener onLongClickListener;//长按View回调监听类的实例
    /**设置长按View事件监听类
     * @param l
     */
    public void setOnLongClickListener(OnLongClickListener l) {
        onLongClickListener = l;
    }

    /**
     * 子类整个视图,可在子类直接使用
     * @must createView方法内对其赋值且不能为null
     */
    protected View convertView = null;

    /**通过id查找并获取控件，使用时不需要强转
     * @param id
     * @return
     */
    @SuppressWarnings("unchecked")
    public <V extends View> V findViewById(int id) {
        return (V) convertView.findViewById(id);
    }
    /**通过id查找并获取控件，并setOnClickListener
     * @param id
     * @param l
     * @return
     */
    public <V extends View> V findViewById(int id, OnClickListener l) {
        V v = findViewById(id);
        v.setOnClickListener(l);
        return v;
    }
    /**创建一个新的View
     * @return
     */
    public abstract View createView(@NonNull LayoutInflater inflater);

    /**获取convertView的宽度
     * @warn 只能在createView后使用
     * @return
     */
    public int getWidth() {
        return convertView.getWidth();
    }
    /**获取convertView的高度
     * @warn 只能在createView后使用
     * @return
     */
    public int getHeight() {
        return convertView.getHeight();
    }

    /**
     * data在列表中的位置
     * @must 只使用setView(int position, T data)方法来设置position，保证position与data对应正确
     */
    protected int position = 0;
    /**获取data在列表中的位置
     */
    public int getPosition() {
        return position;
    }

    protected T data = null;
    /**获取数据
     * @return
     */
    public T getData() {
        return data;
    }

    /**设置并显示内容
     * @warn 只能在createView后使用
     * @param position - data在列表中的位置
     * @param data - 传入的数据
     */
    public void setView(int position, T data) {
        this.position = position;
        setView(data);
    }
    /**设置并显示内容
     * @warn 只能在createView后使用
     * @param data - 传入的数据
     */
    public abstract void setView(T data);

    /**获取可见性
     * @warn 只能在createView后使用
     * @return 可见性 (View.VISIBLE, View.GONE, View.INVISIBLE);
     */
    public int getVisibility() {
        return convertView.getVisibility();
    }
    /**设置可见性
     * @warn 只能在createView后使用
     * @param visibility - 可见性 (View.VISIBLE, View.GONE, View.INVISIBLE);
     */
    public void setVisibility(int visibility) {
        convertView.setVisibility(visibility);
    }

    /**设置背景
     * @warn 只能在createView后使用
     * @param resId
     */
    public void setBackground(int resId) {
        if (resId > 0 && convertView != null) {
            try {
                convertView.setBackgroundResource(resId);
            } catch (Exception e) {
                Log.e(TAG, "setBackground   try { convertView.setBackgroundResource(resId);" +
                        " \n >> } catch (Exception e) { \n" + e.getMessage());
            }
        }
    }

    //resources方法<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
    public String getString(int id) {
        return resources.getString(id);
    }
    public int getColor(int id) {
        return resources.getColor(id);
    }
    public Drawable getDrawable(int id) {
        return resources.getDrawable(id);
    }
    public float getDimension(int id) {
        return resources.getDimension(id);
    }
    //resources方法>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    //show short toast 方法<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
    /**快捷显示short toast方法，需要long toast就用 Toast.makeText(string, Toast.LENGTH_LONG).show(); ---不常用所以这个类里不写
     * @param stringResId
     */
    public void showShortToast(int stringResId) {
        CommonUtil.showShortToast(context, stringResId);
    }
    /**快捷显示short toast方法，需要long toast就用 Toast.makeText(string, Toast.LENGTH_LONG).show(); ---不常用所以这个类里不写
     * @param string
     */
    public void showShortToast(String string) {
        CommonUtil.showShortToast(context, string);
    }
    //show short toast 方法>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    //启动新Activity方法<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

    /**打开新的Activity，向左滑入效果
     * @param intent
     */
    public void toActivity(final Intent intent) {
        CommonUtil.toActivity(context, intent);
    }
    /**打开新的Activity
     * @param intent
     * @param showAnimation
     */
    public void toActivity(final Intent intent, final boolean showAnimation) {
        CommonUtil.toActivity(context, intent, showAnimation);
    }
    /**打开新的Activity，向左滑入效果
     * @param intent
     * @param requestCode
     */
    public void toActivity(final Intent intent, final int requestCode) {
        CommonUtil.toActivity(context, intent, requestCode);
    }
    /**打开新的Activity
     * @param intent
     * @param requestCode
     * @param showAnimation
     */
    public void toActivity(final Intent intent, final int requestCode, final boolean showAnimation) {
        CommonUtil.toActivity(context, intent, requestCode, showAnimation);
    }
    //启动新Activity方法>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    /**销毁并回收内存，建议在对应的View占用大量内存时使用
     * @warn 只能在UI线程中调用
     */
    public void onDestroy() {
        if (convertView != null) {
            try {
                convertView.destroyDrawingCache();
            } catch (Exception e) {
                Log.w(TAG, "onDestroy  try { convertView.destroyDrawingCache();" +
                        " >> } catch (Exception e) {\n" + e.getMessage());
            }
            convertView = null;
        }

        onDataChangedListener = null;
        onTouchListener = null;
        onClickListener = null;
        onLongClickListener = null;

        data = null;
        position = 0;

        context = null;
    }

}

本示例工程QuickAdapter

下载地址

http://files.cnblogs.com/files/tommylemon/QuickAdapter.zip

下载试用

QuickAdapter.apk

用到的开源库ZBLibrary（欢迎Star，欢迎Fork）

下载地址

​https://github.com/TommyLemon/Android-ZBLibrary

下载试用

ZBLibraryDemoApp.apk