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

　　MultiChoiceArrayAdapter其实就是可以多选的ArrayAdapter了，ArrayAdpter我们已经很熟悉了。MultiChoiceArrayAdapter这个类是抽象类，所以使用前必须要继承。下面是使用MultiChoiceArrayAdapter的步骤：

0.用自定义的控件来写一个layout

1.写一个类来继承MultiChoiceArrayAdapter

2.实例化这个类

3.用setAdapterView()来设置要加载适配器的控件。

4.写上保存的方法

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

零、写布局文件

listview_actionmode_layout.xml

没什么特别的，就一个listview

<?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/actionMode_listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ListView>

</LinearLayout>

item.xml

注意这里要用自己定义的实现了Checkable接口的控件

<?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" />

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

二、继承MultiChoiceAdapter

这个是重点，每个方法中实现了不同的功能。其中discardSelectedItems()是自己写的，用来移除已经选中的items。

注意：onCreateActionMode()必须返回true，否则报错！

    private class TestAdapter extends MultiChoiceArrayAdapter<String>{

        String tag = getClass().getSimpleName().toString();

        /**
         * @param savedInstanceState
         * @param context
         * @param resource：Item的布局文件，即 R.layout.xxx
         * @param textViewResourceId：显示文字的textview的id，即R.id.xxxx
         * @param objects：一个String数组
         */
        public TestAdapter(Bundle savedInstanceState, Context context,
                int resource, int textViewResourceId, String[] objects) {
            //为了避免错误，这里将String数组转为ArrayList对象
            this(savedInstanceState,context,resource,textViewResourceId,
                    new ArrayList<String>(Arrays.asList(objects)));
        }

        /**
         * @param savedInstanceState
         * @param context
         * @param resource：Item的布局文件，即 R.layout.xxx
         * @param textViewResourceId：显示文字的textview的id，即R.id.xxxx
         * @param items：一个list<String>对象
         */
        public TestAdapter(Bundle savedInstanceState, Context context,
                int resource, int textViewResourceId, List<String> items) {
            super(savedInstanceState, context, resource, textViewResourceId, items);
        }

        /**
         * 传入actionMode对象，进行设置图标和操作
         * 注意要返回true！
         */
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            Log.i(tag, "onCreateActionMode");
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.my_action_mode, menu);
            //这里必须要写true，否则会报空指针！！！
            return true;
        }

        /**
         * 进行AndroidMode上图标操作的设置
         */
        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            if (item.getItemId() == R.id.menu_share) {
                Toast.makeText(getContext(), "分享了" + getCheckedItemCount()+"个item", Toast.LENGTH_SHORT).show();
                return true;
            }
            if (item.getItemId() == R.id.menu_discard) {
                //丢弃选中的items
                discardSelectedItems();
                return true;
            }
            return false;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
            Log.i(tag, "onPrepareActionMode");
            return false;
        }

        /**
         * （非必须）
         * 设置点击、选中效果，非必须。如果你在item的layout设置了 android:background那么下面就不用进行设置背景了
         * 个人推荐在item的layout中设置背景色，example：android:background="@drawable/custom_list_item_background"
         */
        /*@Override
        protected View getViewImpl(int position, View convertView, ViewGroup parent) {
            //Log.i(tag, "getViewImpl");
            View view = super.getViewImpl(position, convertView, parent);
            view.setBackgroundResource(R.drawable.custom_list_item_background);
            return view;
        }*/

        /**
         * 从适配器中移除某些item
         */
        private void discardSelectedItems() {
            //得到选中的items
            Set<Long> selection = getCheckedItems();
            String[] items = new String[selection.size()];
            int i = 0;
            for (long position : selection) {
                items[i++] = getItem((int)position);
            }

            //通过判断名字来remove掉这些items
            for (String item : items) {
                /**
                 * 这里用remove时要注意传入适配器的不能是String[] items对象。否则会报错
                 * 这里我已经在构造函数中进行了处理，传入String数组也不会出错了~
                 */
                remove(item);
            }

            finishActionMode();
        }    

    }

这里在继承的时候其实就顺带实现了ActionMode的callback接口的内容了，如果对ActionMode熟悉的人一定很容易理解。

二、实例化这个类

TestAdapter actionModeAdapter;

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

        ListView actionModelistView = (ListView)findViewById(R.id.actionMode_listView);

        actionModeAdapter = new TestAdapter(savedInstanceState, this,R.layout.item, R.id.item_textView, data);

三、设置控件和监听器

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_actionmode_layout);

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

        ListView actionModelistView = (ListView)findViewById(R.id.actionMode_listView);

        actionModeAdapter = new TestAdapter(savedInstanceState, this,R.layout.item, R.id.item_textView, data);
        actionModeAdapter.setAdapterView(actionModelistView);
        actionModeAdapter.setOnItemClickListener(new MyItemClick(actionModeAdapter));

        //listView.setAdapter(adapter);//不这么用啦

    }

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

        private TestAdapter mAdapter;

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

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
            Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position), Toast.LENGTH_SHORT).show();
        }

    }

四、保存的方法

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

于是大功告成！下面是全部代码：

ArrayAdapterTestActivity.java （这个类没用兼容模式，如果用兼容模式请参考顶部的注释，其实就是导入不同的包即可）

package com.kale.multichoiceadaptertest;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.manuelpeinado.multichoiceadapter.normal.MultiChoiceArrayAdapter;

/**
 * 如果是4.0以上的版本可以直接用activity，不用actionbarActivity，导入的时候导入
 * import android.view.ActionMode;
 * import com.manuelpeinado.multichoiceadapter.normal.MultiChoiceArrayAdapter;
 * 把
 * import android.support.v7.view.ActionMode;
 * import com.manuelpeinado.multichoiceadapter.compat.MultiChoiceArrayAdapter;
 * 删掉
 */

/**
 * @author:Jack Tony
 * @tips  :ActionMode和ArrayAdapter配合实现多选
 * @date  :2014-10-21
 */
public class ArrayAdapterTestActivity extends Activity{

    TestAdapter actionModeAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_actionmode_layout);

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

        ListView actionModelistView = (ListView)findViewById(R.id.actionMode_listView);

        actionModeAdapter = new TestAdapter(savedInstanceState, this,R.layout.item, R.id.item_textView, data);
        actionModeAdapter.setAdapterView(actionModelistView);
        actionModeAdapter.setOnItemClickListener(new MyItemClick(actionModeAdapter));

        //listView.setAdapter(adapter);//不这么用啦

    }

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

    private class TestAdapter extends MultiChoiceArrayAdapter<String>{

        String tag = getClass().getSimpleName().toString();

        /**
         * @param savedInstanceState
         * @param context
         * @param resource：Item的布局文件，即 R.layout.xxx
         * @param textViewResourceId：显示文字的textview的id，即R.id.xxxx
         * @param objects：一个String数组
         */
        public TestAdapter(Bundle savedInstanceState, Context context,
                int resource, int textViewResourceId, String[] objects) {
            //为了避免错误，这里将String数组转为ArrayList对象
            this(savedInstanceState,context,resource,textViewResourceId,
                    new ArrayList<String>(Arrays.asList(objects)));
        }

        /**
         * @param savedInstanceState
         * @param context
         * @param resource：Item的布局文件，即 R.layout.xxx
         * @param textViewResourceId：显示文字的textview的id，即R.id.xxxx
         * @param items：一个list<String>对象
         */
        public TestAdapter(Bundle savedInstanceState, Context context,
                int resource, int textViewResourceId, List<String> items) {
            super(savedInstanceState, context, resource, textViewResourceId, items);
        }

        /**
         * 传入actionMode对象，进行设置图标和操作
         * 注意要返回true！
         */
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            Log.i(tag, "onCreateActionMode");
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.my_action_mode, menu);
            //这里必须要写true，否则会报空指针！！！
            return true;
        }

        /**
         * 进行AndroidMode上图标操作的设置
         */
        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            if (item.getItemId() == R.id.menu_share) {
                Toast.makeText(getContext(), "分享了" + getCheckedItemCount()+"个item", Toast.LENGTH_SHORT).show();
                return true;
            }
            if (item.getItemId() == R.id.menu_discard) {
                //丢弃选中的items
                discardSelectedItems();
                return true;
            }
            return false;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
            Log.i(tag, "onPrepareActionMode");
            return false;
        }

        /**
         * （非必须）
         * 设置点击、选中效果，非必须。如果你在item的layout设置了 android:background那么下面就不用进行设置背景了
         * 个人推荐在item的layout中设置背景色，example：android:background="@drawable/custom_list_item_background"
         */
        /*@Override
        protected View getViewImpl(int position, View convertView, ViewGroup parent) {
            //Log.i(tag, "getViewImpl");
            View view = super.getViewImpl(position, convertView, parent);
            view.setBackgroundResource(R.drawable.custom_list_item_background);
            return view;
        }*/

        /**
         * 从适配器中移除某些item
         */
        private void discardSelectedItems() {
            //得到选中的items
            Set<Long> selection = getCheckedItems();
            String[] items = new String[selection.size()];
            int i = 0;
            for (long position : selection) {
                items[i++] = getItem((int)position);
            }

            //通过判断名字来remove掉这些items
            for (String item : items) {
                /**
                 * 这里用remove时要注意传入适配器的不能是String[] items对象。否则会报错
                 * 这里我已经在构造函数中进行了处理，传入String数组也不会出错了~
                 */
                remove(item);
            }

            finishActionMode();
        }    

    }

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

        private TestAdapter mAdapter;

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

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
            Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position), 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