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