开源项目MultiChoiceAdapter详解（五）——可扩展的MultiChoiceBaseAdapter

　　上次写到了开源项目MultiChoiceAdapter详解（四）——MultiChoiceBaseAdapter的使用，其实我们仍旧可以不使用ActionMode的，所以这里就写一个自己扩展的方法。

一、布局文件

listview_normal_layout.xml

<?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" >

    <ListView
         android:id="@+id/normal_listView"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1" >
    </ListView>

    <LinearLayout
        android:id="@+id/setting_linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom">

        <Button
            android:id="@+id/selectAll_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全选"
            android:layout_weight="1"
            android:onClick="buttonListener"/>

        <Button
            android:id="@+id/cancle_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="取消"
            android:layout_weight="1"
            android:onClick="buttonListener"/>

        <Button
            android:id="@+id/delete_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="删除"
            android:onClick="buttonListener"/>

        <Button
            android:id="@+id/share_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="分享"
            android:layout_weight="1"
            android:onClick="buttonListener"/>

    </LinearLayout>

</LinearLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<com.manuelpeinado.multichoiceadapter.view.CheckableLinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    android:background="@drawable/custom_list_item_background"

    android:orientation="horizontal">
    <!-- 上面必须要用自定义的layout，否则不会有选中的效果！！！ -->

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="16dp"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/item_textView"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="30dp"
            android:layout_gravity="center_vertical"
            android:textColor="#000000"
            android:layout_weight="1"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <!--
            CheckBox中一定要写上focusable="false"否则无法相应点击事件
            @android:id/checkbox这个也一定要写，如果不写的话点击checkbox就不会触发多选状态
            如果你不想要选中checkbox就触发多选状态的话，这里可以用自己定义的id就行
         -->
        <CheckBox
            android:id="@android:id/checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|right"
            android:layout_weight="1"
            android:layout_marginLeft="40dp"
            android:textColor="#000000"
            android:focusable="false"
            android:visibility="gone"
            android:text="" />

    </LinearLayout>
</com.manuelpeinado.multichoiceadapter.view.CheckableLinearLayout> 

view_header.xml

这个是用于给listview添加一个头部视图的，顺带学习下listview添加顶部视图的方法呗~

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="16dp"
    android:paddingTop="16dp"
    android:text="这是给listview添加的顶部视图"
    android:gravity="center_horizontal"
    android:textStyle="bold" />

二、继承类然后实现

可以看见这里关于ActionMode有关的回调方法我都是空实现

    private class MultiBaseAdapter extends MultiChoiceBaseAdapter{

        private String[] mData;

        /**
         * 构造函数
         * @param savedInstanceState
         */
        public MultiBaseAdapter(Bundle savedInstanceState,String[] data) {
            super(savedInstanceState);
            // TODO 自动生成的构造函数存根
            mData = data;
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            return true;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            return false;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
            // TODO 自动生成的方法存根
            return false;
        }

        /**
         * 看适配器中有多少元素需要加载
         */
        @Override
        public int getCount() {
            // TODO 自动生成的方法存根
            return mData.length;
        }

        /**
         * 通过position来得到相应的item，这里返回object对象
         */
        @Override
        public Object getItem(int position) {
            // TODO 自动生成的方法存根
            return mData[position];
        }

        /**
         * 通过position得到id
         */
        @Override
        public long getItemId(int position) {
            // TODO 自动生成的方法存根
            return position;
        }

        /**
         * 返回item的view对象
         */
        @Override
        protected View getViewImpl(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                int layout = R.layout.item;
                LayoutInflater inflater = LayoutInflater.from(getContext());
                convertView = inflater.inflate(layout, parent, false);
            }
            ViewGroup group = (ViewGroup)convertView;
            ((TextView)group.findViewById(R.id.item_textView)).setText(mData[position]);
            ((CheckBox)group.findViewById(android.R.id.checkbox)).setVisibility(View.VISIBLE);
            return group;
        }

    }

三、配置适配器和相应的监听器

listView.addHeaderView(createHeaderView(), null, false);是给listview添加头视图的方法，传入false表示头图不能点击

    private MultiBaseAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_normal_layout);

        String[] data = {"android","ios","wp","c++",
                 "java","c#","javascript","vb",
                 "delphi","PB","ASP","SQL"};

        final LinearLayout settingLL = (LinearLayout)findViewById(R.id.setting_linearLayout);
        settingLL.setVisibility(View.GONE);

        ListView listView = (ListView)findViewById(R.id.normal_listView);

        /**
         * 给listview顶部添加2个额外视图，设置顶部视图不可点击
         */
        listView.addHeaderView(createHeaderView(), null, false);
        listView.addHeaderView(createHeaderView(), null, false);
        //实例化适配器
        adapter = new MultiBaseAdapter(savedInstanceState, data);
        //添加视图
        adapter.setAdapterView(listView);
        //设置不显示actionMode
        adapter.showActionMode(false);
        //点击事件
        adapter.setOnItemClickListener(new MyItemClick(adapter));
        //监听选中的状态
        adapter.setOnSelectedStateChangeListener(new OnSelectedStateChangeListener() {
            /**
             * checkedItemCount = 已经选中的item数目
             */
            @Override
            public void onSelectedStateChanged(int checkedItemCount) {
                if (checkedItemCount != 0) {
                    settingLL.setVisibility(View.VISIBLE);
                }
                else {
                    settingLL.setVisibility(View.GONE);
                }
            }
        });
    }

    private View createHeaderView() {
        return LayoutInflater.from(this).inflate(R.layout.view_header, null);
    }

点击事件的监听器：

    /**
     * @author:Jack Tony
     * @tips  :点击事件的监听器
     * @date  :2014-10-20
     */
    private class MyItemClick implements OnItemClickListener{

        private MultiChoiceBaseAdapter mAdapter;

        public MyItemClick(MultiChoiceBaseAdapter adapter) {
            mAdapter = adapter;
        }

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
            //因为在顶部添加了2个视图，所以这里的位置要下移两位

            Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position - 2), Toast.LENGTH_SHORT).show();
        }

    }

四、用回调方法来优化

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        adapter.save(outState);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK ) {
            if (adapter.getCheckedItemCount() > 0) {
                cancleAll(adapter);
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }  

    public void buttonListener(View v) {
        switch (v.getId()) {
        case R.id.selectAll_button:
            selectAll(adapter);
            break;
        case R.id.cancle_button:
            cancleAll(adapter);
            break;
        case R.id.delete_button:
            delectItems(adapter);
            break;
        case R.id.share_button:
            Toast.makeText(getApplicationContext(), "分享"+Arrays.toString(getSelectedItems(adapter)), 1).show();
            cancleAll(adapter);
            break;
        default:
            break;
        }
    }

    /**
     * 全选
     * @param adapter
     */
    private void selectAll(MultiChoiceBaseAdapter  adapter) {
        for (int i = 0; i < adapter.getCount(); ++i) {
            adapter.setItemChecked(i, true);
        }
    }

    /**
     * 取消所有选择效果
     * @param adapter
     */
    private void cancleAll(MultiChoiceBaseAdapter  adapter) {
        for (int i = 0; i < adapter.getCount(); ++i) {
            adapter.setItemChecked(i, false);
        }
    }

    /**
     * 得到已经选中的items
     * @param adapter
     * @return
     */
    private String[] getSelectedItems(MultiChoiceBaseAdapter adapter) {
        //得到选中的items
        Set<Long> selection = adapter.getCheckedItems();
        String[] items = new String[selection.size()];
        int i = 0;
        for (long position : selection) {
            items[i++] = (String)adapter.getItem((int)position);
        }
        return items;
    }

    /**
     * 删除已经选中的items
     * @param adapter
     */
    private void delectItems(MultiChoiceBaseAdapter  adapter) {
        //通过判断名字来remove掉这些items
        // TODO:删除某些元素，因为这里的数据源是String[]所以没有链表那样好删除，就没去实现。
        //实际中：推荐用链表来动态删除元素，在删除时需要注意的是最好以唯一的id，如position来进行删除
        cancleAll(adapter);
    }

搞定了！！！

全部代码：

package com.kale.multichoiceadaptertest;

import java.util.Arrays;
import java.util.Set;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.view.ActionMode;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.manuelpeinado.multichoiceadapter.base.OnSelectedStateChangeListener;
import com.manuelpeinado.multichoiceadapter.compat.MultiChoiceBaseAdapter;

public class BaseAdapterNormalTestActivity extends Activity{

    private MultiBaseAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_normal_layout);

        String[] data = {"android","ios","wp","c++",
                 "java","c#","javascript","vb",
                 "delphi","PB","ASP","SQL"};

        final LinearLayout settingLL = (LinearLayout)findViewById(R.id.setting_linearLayout);
        settingLL.setVisibility(View.GONE);

        ListView listView = (ListView)findViewById(R.id.normal_listView);

        /**
         * 给listview顶部添加2个额外视图，设置顶部视图不可点击
         */
        listView.addHeaderView(createHeaderView(), null, false);
        listView.addHeaderView(createHeaderView(), null, false);
        //实例化适配器
        adapter = new MultiBaseAdapter(savedInstanceState, data);
        //添加视图
        adapter.setAdapterView(listView);
        //设置不显示actionMode
        adapter.showActionMode(false);
        //点击事件
        adapter.setOnItemClickListener(new MyItemClick(adapter));
        //监听选中的状态
        adapter.setOnSelectedStateChangeListener(new OnSelectedStateChangeListener() {
            /**
             * checkedItemCount = 已经选中的item数目
             */
            @Override
            public void onSelectedStateChanged(int checkedItemCount) {
                if (checkedItemCount != 0) {
                    settingLL.setVisibility(View.VISIBLE);
                }
                else {
                    settingLL.setVisibility(View.GONE);
                }
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        adapter.save(outState);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK ) {
            if (adapter.getCheckedItemCount() > 0) {
                cancleAll(adapter);
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }  

    private View createHeaderView() {
        return LayoutInflater.from(this).inflate(R.layout.view_header, null);
    }

    private class MultiBaseAdapter extends MultiChoiceBaseAdapter{

        private String[] mData;

        /**
         * 构造函数
         * @param savedInstanceState
         */
        public MultiBaseAdapter(Bundle savedInstanceState,String[] data) {
            super(savedInstanceState);
            // TODO 自动生成的构造函数存根
            mData = data;
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            return true;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            return false;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
            // TODO 自动生成的方法存根
            return false;
        }

        /**
         * 看适配器中有多少元素需要加载
         */
        @Override
        public int getCount() {
            // TODO 自动生成的方法存根
            return mData.length;
        }

        /**
         * 通过position来得到相应的item，这里返回object对象
         */
        @Override
        public Object getItem(int position) {
            // TODO 自动生成的方法存根
            return mData[position];
        }

        /**
         * 通过position得到id
         */
        @Override
        public long getItemId(int position) {
            // TODO 自动生成的方法存根
            return position;
        }

        /**
         * 返回item的view对象
         */
        @Override
        protected View getViewImpl(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                int layout = R.layout.item;
                LayoutInflater inflater = LayoutInflater.from(getContext());
                convertView = inflater.inflate(layout, parent, false);
            }
            ViewGroup group = (ViewGroup)convertView;
            ((TextView)group.findViewById(R.id.item_textView)).setText(mData[position]);
            ((CheckBox)group.findViewById(android.R.id.checkbox)).setVisibility(View.VISIBLE);
            return group;
        }

    }

    public void buttonListener(View v) {
        switch (v.getId()) {
        case R.id.selectAll_button:
            selectAll(adapter);
            break;
        case R.id.cancle_button:
            cancleAll(adapter);
            break;
        case R.id.delete_button:
            delectItems(adapter);
            break;
        case R.id.share_button:
            Toast.makeText(getApplicationContext(), "分享"+Arrays.toString(getSelectedItems(adapter)), 1).show();
            cancleAll(adapter);
            break;
        default:
            break;
        }
    }

    /**
     * 全选
     * @param adapter
     */
    private void selectAll(MultiChoiceBaseAdapter  adapter) {
        for (int i = 0; i < adapter.getCount(); ++i) {
            adapter.setItemChecked(i, true);
        }
    }

    /**
     * 取消所有选择效果
     * @param adapter
     */
    private void cancleAll(MultiChoiceBaseAdapter  adapter) {
        for (int i = 0; i < adapter.getCount(); ++i) {
            adapter.setItemChecked(i, false);
        }
    }

    /**
     * 得到已经选中的items
     * @param adapter
     * @return
     */
    private String[] getSelectedItems(MultiChoiceBaseAdapter adapter) {
        //得到选中的items
        Set<Long> selection = adapter.getCheckedItems();
        String[] items = new String[selection.size()];
        int i = 0;
        for (long position : selection) {
            items[i++] = (String)adapter.getItem((int)position);
        }
        return items;
    }

    /**
     * 删除已经选中的items
     * @param adapter
     */
    private void delectItems(MultiChoiceBaseAdapter  adapter) {
        //通过判断名字来remove掉这些items
        // TODO:删除某些元素，因为这里的数据源是String[]所以没有链表那样好删除，就没去实现。
        //实际中：推荐用链表来动态删除元素，在删除时需要注意的是最好以唯一的id，如position来进行删除
        cancleAll(adapter);
    }

    /**
     * @author:Jack Tony
     * @tips  :点击事件的监听器
     * @date  :2014-10-20
     */
    private class MyItemClick implements OnItemClickListener{

        private MultiChoiceBaseAdapter mAdapter;

        public MyItemClick(MultiChoiceBaseAdapter adapter) {
            mAdapter = adapter;
        }

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
            //因为在顶部添加了2个视图，所以这里的位置要下移两位

            Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position - 2), Toast.LENGTH_SHORT).show();
        }

    }
}

开源项目MultiChoiceAdapter详解（一）——概要介绍

开源项目MultiChoiceAdapter详解（二）——MultiChoiceArrayAdapter的使用

开源项目MultiChoiceAdapter详解（三）——MulitChoiceNormalArrayAdapter的使用

开源项目MultiChoiceAdapter详解（四）——MultiChoiceBaseAdapter的使用

开源项目MultiChoiceAdapter详解（五）——可扩展的MultiChoiceBaseAdapter

开源项目MultiChoiceAdapter详解（六）——GridView和MultiChoiceBaseAdapter配合使用