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

　　MulitChoiceNormalArrayAdapter是我自己定义的一个类，其实就是实现了MulitChoiceArrayAdapter，为什么做这个简单的实现类呢，因为这样我们在不用ActionMode的时候就不用每次要写一个类来继承MulitChoiceArrayAdapter了，直接实例化MulitChoiceNormalArrayAdapter即可。下面贴一个compat包下的MulitChoiceNormalArrayAdapter的源码。

MulitChoiceNormalArrayAdapter.java

package com.manuelpeinado.multichoiceadapter.compat;

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

import android.content.Context;
import android.os.Bundle;
import android.support.v7.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;

public class MulitChoiceNormalArrayAdapter<T> extends MultiChoiceArrayAdapter<T> {

    public MulitChoiceNormalArrayAdapter(Bundle savedInstanceState,
            Context context, int resource, int textViewResourceId) {
        super(savedInstanceState, context, resource, textViewResourceId);
        // TODO 自动生成的构造函数存根
    }

    public MulitChoiceNormalArrayAdapter(Bundle savedInstanceState,
            Context context, int resource, int textViewResourceId,
            List<T> objects) {
        super(savedInstanceState, context, resource, textViewResourceId, objects);
        // TODO 自动生成的构造函数存根
    }

    public MulitChoiceNormalArrayAdapter(Bundle savedInstanceState,
            Context context, int resource, int textViewResourceId, T[] objects) {
        this(savedInstanceState,context,resource,textViewResourceId,new ArrayList<T>(Arrays.asList(objects)));
        // TODO 自动生成的构造函数存根
    }

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

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

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

}

好了，知道了这个后我们来看怎么简单的来使用这个适配器进行多选。

1.写布局文件

2.实例化MultiChoiceAdapter

3.设置showActionMode(false)来表示不使用ActionMode

4.setAdapterView();来设置要用适配器的view对象

5.设置下监听器来进行各种扩展的操作

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" />

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

二、实现适配器和绑定适配器

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

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

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

        //ArrayList<String> items = new ArrayList<>(Arrays.asList(data));

        normalAdapter = new MulitChoiceNormalArrayAdapter<String>(savedInstanceState,
                getApplicationContext(), R.layout.item, R.id.item_textView, data);

        normalAdapter.showActionMode(false);//设置为显示actionmode的普通模式
        normalAdapter.setAdapterView(normalListView);
        normalAdapter.setOnItemClickListener(new MyItemClick(normalAdapter));

三、写一些回调方法来优化，比如选中时点击返回后取消选中

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

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

四、绑定监听器

setOnItemClickListener是在item被点击时触发的

setOnSelectedStateChangeListener是item被选中或者取消选中时触发的

        normalAdapter.setOnItemClickListener(new MyItemClick(normalAdapter));
        normalAdapter.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);
                }
            }
        });

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

        private MultiChoiceArrayAdapter<String> mAdapter;

        public MyItemClick(MultiChoiceArrayAdapter<String> 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();
        }

    }

五、通过按钮进行操作（这是扩展性的重要体现）

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

    /**
     * 全选
     * @param adapter
     */
    private void selectAll(MultiChoiceArrayAdapter<String>  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(MultiChoiceArrayAdapter<String>  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(MultiChoiceArrayAdapter<String> 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++] = adapter.getItem((int)position);
        }
        return items;
    }

    /**
     * 删除已经选中的items
     * @param adapter
     */
    private void delectItems(MultiChoiceArrayAdapter<String>  adapter) {
        //通过判断名字来remove掉这些items
        for (String item : getSelectedItems(adapter)) {
            /**
             * 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~
             */
            adapter.remove(item);
        }
        cancleAll(adapter);
    }

全部搞定了！！！

下面是全部代码：

package com.kale.multichoiceadaptertest;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;

import com.manuelpeinado.multichoiceadapter.base.OnSelectedStateChangeListener;
import com.manuelpeinado.multichoiceadapter.compat.MulitChoiceNormalArrayAdapter;
import com.manuelpeinado.multichoiceadapter.compat.MultiChoiceArrayAdapter;

/**
 * 如果不用到ActionMode对象的话可以放心大胆的继承activity，也不用导入ActionMode了。
 *
 * 其实在不用ActionMode时导入
 * import com.manuelpeinado.multichoiceadapter.normal.MulitChoiceNormalArrayAdapter;
 * import com.manuelpeinado.multichoiceadapter.normal.MultiChoiceArrayAdapter;
 * 或者是
 * import com.manuelpeinado.multichoiceadapter.compat.MulitChoiceNormalArrayAdapter;
 * import com.manuelpeinado.multichoiceadapter.compat.MultiChoiceArrayAdapter;
 * 都一样的，只是为了以后的扩展，还是按需导入吧。
 * 4.0以上的导入normal包下面的，兼容2.0的导入compat包下的
 */

public class ArrayAdapterNormalTestActivity extends Activity{

    MulitChoiceNormalArrayAdapter<String> normalAdapter;

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

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

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

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

        //ArrayList<String> items = new ArrayList<>(Arrays.asList(data));

        normalAdapter = new MulitChoiceNormalArrayAdapter<String>(savedInstanceState,
                getApplicationContext(), R.layout.item, R.id.item_textView, data);

        normalAdapter.showActionMode(false);//设置为显示actionmode的普通模式
        normalAdapter.setAdapterView(normalListView);
        normalAdapter.setOnItemClickListener(new MyItemClick(normalAdapter));
        normalAdapter.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) {
        normalAdapter.save(outState);
    }

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

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

    /**
     * 全选
     * @param adapter
     */
    private void selectAll(MultiChoiceArrayAdapter<String>  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(MultiChoiceArrayAdapter<String>  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(MultiChoiceArrayAdapter<String> 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++] = adapter.getItem((int)position);
        }
        return items;
    }

    /**
     * 删除已经选中的items
     * @param adapter
     */
    private void delectItems(MultiChoiceArrayAdapter<String>  adapter) {
        //通过判断名字来remove掉这些items
        for (String item : getSelectedItems(adapter)) {
            /**
             * 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~
             */
            adapter.remove(item);
        }
        cancleAll(adapter);
    }

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

        private MultiChoiceArrayAdapter<String> mAdapter;

        public MyItemClick(MultiChoiceArrayAdapter<String> 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