Android快速开发之appBase——(2).万能的Adapter

android的Adapter是常用的一个组件，自定义的adapter基本上都是集成BaseAdapter，然后实现getView等一系列方法。时间长了，难免让人感觉到写的重复性代码过多，那么万能的Adapter讲解放你的双手。

对比

• BaseAdapter

package com.snicesoft.appbase.demo;import java.util.ArrayList;import java.util.List;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class ListBaseAdapter extends BaseAdapter {    List<Data> datas = new ArrayList<ListBaseAdapter.Data>();    public void setDatas(List<Data> datas) {        this.datas = datas;        notifyDataSetChanged();    }    public class Holder {        TextView tvTitle;        ImageView imgIcon;    }    public static class Data {        String title;        int icon;        public Data(String title, int icon) {            super();            this.title = title;            this.icon = icon;        }    }    @Override    public int getCount() {        return datas.size();    }    @Override    public Object getItem(int position) {        return null;    }    @Override    public long getItemId(int position) {        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Holder holder;        if(convertView == null){            holder = new Holder();            convertView = View.inflate(parent.getContext(), R.layout.item_listdemo, null);            holder.tvTitle = (TextView) convertView.findViewById(R.id.tvTitle);            holder.imgIcon = (ImageView) convertView.findViewById(R.id.imgIcon);            convertView.setTag(holder);        }else{            holder = (Holder) convertView.getTag();        }        holder.tvTitle.setText(datas.get(position).title);        holder.imgIcon.setImageResource(datas.get(position).icon);        return convertView;    }}

• AvAdapter(万能Adapter)

package com.snicesoft.appbase.demo;import android.content.Context;import android.widget.ImageView;import android.widget.TextView;import com.snicesoft.avlib.annotation.DataBind;import com.snicesoft.avlib.annotation.DataType;import com.snicesoft.avlib.annotation.Id;import com.snicesoft.avlib.annotation.Layout;import com.snicesoft.avlib.rule.IData;import com.snicesoft.avlib.rule.IHolder;import com.snicesoft.avlib.widget.AvAdapter;@Layout(R.layout.item_listdemo)public class ListDemoAdapter extends        AvAdapter<ListDemoAdapter.Holder, ListDemoAdapter.Data> {    public class Holder extends IHolder {        @Id(R.id.tvTitle)        TextView tvTitle;        @Id(R.id.imgIcon)        ImageView imgIcon;        @Override        public void initViewParams() {        }    }    public static class Data extends IData {        @DataBind(id = R.id.tvTitle)        String title;        @DataBind(id = R.id.imgIcon, dataType = DataType.IMG)        int icon;        public Data(String title, int icon) {            super();            this.title = title;            this.icon = icon;        }    }    public ListDemoAdapter(Context context) {        super(context);    }    @Override    public Holder newHolder() {        return new Holder();    }}

• 结论：不用再写getView方法以及各种findviewbyid、getcout等方法。只需要掌握holder和data的配置规则就可以轻松使用。

Activity中使用

package com.snicesoft.appbase.demo;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;import com.snicesoft.avlib.annotation.DataBind;import com.snicesoft.avlib.annotation.DataType;import com.snicesoft.avlib.annotation.Id;import com.snicesoft.avlib.annotation.Layout;import com.snicesoft.avlib.rule.IData;import com.snicesoft.avlib.rule.IHolder;import com.snicesoft.base.BaseActivity;@Layout(R.layout.activity_main)public class MainActivity extends        BaseActivity<MainActivity.Holder, MainActivity.Data> {    public class Holder extends IHolder {        @Id(R.id.textView1)        TextView textView1;        @Id(R.id.button1)        Button button1;        @Id(R.id.listView1)        ListView listView1;        @Override        public void initViewParams() {        }    }    public class Data extends IData {        @DataBind(id = R.id.textView1)        String tv1 = "我是自动绑定的TextView";        @DataBind(id = R.id.button1)        String btn1 = "我是自动绑定的Button";        @DataBind(id = R.id.listView1, dataType = DataType.ADAPTER)//      ListBaseAdapter adapter = new ListBaseAdapter();        ListDemoAdapter adapter = new ListDemoAdapter(MainActivity.this);    }    @Override    public Data newData() {        return new Data();    }    @Override    public Holder newHolder() {        return new Holder();    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//      List<ListBaseAdapter.Data> datas = new ArrayList<ListBaseAdapter.Data>();        List<ListDemoAdapter.Data> datas = new ArrayList<ListDemoAdapter.Data>();        for (int i = 1; i <= 10; i++) {//          datas.add(new ListBaseAdapter.Data("标题"+i, R.drawable.ic_launcher));            datas.add(new ListDemoAdapter.Data("标题"+i, R.drawable.ic_launcher));        }        _data.adapter.addAll(datas);    }}

• 被注释的是BaseAdapter

说明

• ListDemoAdapter是由代码生成器生成：包括layout的xml文件、Holder和Data的主体
• avlib框架基于注解配置，简化代码，让开发者更加关注其他业务的处理，UI上的处理将会越来越简单清晰。

最后

欢迎大家指点，有好的想法可以提出，我将会不断优化框架。