ListView多选操作模式详解CHOICE_MODE_MULTIPLE与CHOICE_MODE_M

原创
2014/11/07 09:58
阅读数 414

这篇文章我们将详细的介绍如何实现ListView的多选操作,文中将会纠正在使用ListViewCHOICE_MODE_MULTIPLE或者CHOICE_MODE_MULTIPLE_MODAL时容易犯的错误,以及

CHOICE_MODE_MULTIPLE与CHOICE_MODE_MULTIPLE_MODAL的区别。最后我们将给出一个demo来演示两种多选操作的实现。


一、在不使用ListView多选模式的情况下

注:我认为这一节可以不看,因为我觉得不使用ListView的多选模式有点愚蠢。

如果我们不知道ListView自带多选模式,那么我们一般是通过维护一个保存被选择position集合来实现多选的,通常情况下这个集合类型我们选择HashSet。

实现的大致框架如下:

Adapter中:

保存被选择的position


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public HashSet<Long> selectedItems =     new     HashSet<Long>();


getView中判断当前Position是否在集合中,从而显示不同的外观


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         public View getView(int position, View convertView, ViewGroup par) {
......
                 if     (selectedItems.contains((long)position)){
                     holder.cBox.setChecked(     true     );
                 }     else     {
                     holder.cBox.setChecked(     false     );
                 }
                 if     (selectedMode==AppContext.MULTI_SELECTED){
                     holder.cBox.setVisibility(View.VISIBLE);
                     holder.check_box_wraper.setVisibility(View.VISIBLE);
                 }     else     {
                     holder.cBox.setVisibility(View.GONE);
                     holder.check_box_wraper.setVisibility(View.GONE);
                 }
.....

Activity中:

主要是处理onItemClick事件,在不同模式下,做不同的处理。


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@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
         //普通模式 :直接打开一个activity
             if     (itemClickActionMode==AppContext.VIEW_NOTE){
                 Long mId=Long.parseLong(idText.getText().toString());
                 Uri uri = ContentUris.withAppendedId(getIntent().getData(), mId);
                 startActivity(     new     Intent(Intent.ACTION_VIEW, uri));
             }
             //多选模式:更新adapter中selectedItems 集合的值,同时 让adapter在getView中改变item的外观。
            else     {
                 ViewHolder vHollder = (ViewHolder) v.getTag();
                 if     (mAdapter.selectedItems.contains((long)position)){
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
                     mAdapter.selectedItems.remove((long)position);
                 }     else     {
                             mAdapter.selectedItems.add((long)position);
                 }
                 mAdapter.notifyDataSetChanged();
                 onItemSelected(getSelectedCount());    
             }
         }


上面的做法其实用的很普遍。但是我们不提倡。


二、使用ListViiewCHOICE_MODE_MULTIPLE模式


ListView有四种模式:

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/**
      * Normal list that does not indicate choices
      */
public static final int CHOICE_MODE_NONE = 0;
/**
      * The list allows up to one choice
      */
public static final int CHOICE_MODE_SINGLE = 1;
/**
      * The list allows multiple choices
      */
public static final int CHOICE_MODE_MULTIPLE = 2;
/**
      * The list allows multiple choices in a modal selection mode
      */
public static final int CHOICE_MODE_MULTIPLE_MODAL = 3;


其中CHOICE_MODE_NONE是普通模式,CHOICE_MODE_SINGLE是单选模式,不常用,CHOICE_MODE_MULTIPLECHOICE_MODE_MULTIPLE_MODAL都是多选模式,他们的区别稍后我们会讲到。

所 以ListView在设计的时候其实是考虑了多选操作的,我们没有必要自己再像第一节描述的那样专门维护一个HashSet来保存被选择的 position。实现ListView的多选操作的代码在ListView直接父类AbsListView中,AbsListView已经有一个 mCheckStates变量来做了保存被选择的position这个事情。mCheckStates的定义如下:


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SparseBooleanArray mCheckStates;

AbsListView还定义了如下公共方法:

//判断一个item是否被选中

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public boolean isItemChecked(int position);

//获得被选中item的总数

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public int getCheckedItemCount();

//选中一个item

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public void setItemChecked(int position, boolean value);

//清除选中的item

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public void clearChoices();


当 点击一个item的时候absListView中会调用performItemClick,如果是CHOICE_MODE_MULTIPLE,则该 item点击一次,mCheckStates中相应位置的状态变更一次。然后我们就可以通过listView的 getCheckedItemCount()方法获取选择了多少个;isItemChecked(int position)方法判断一个item是不是被选中。

有了这些原生sdk的支持,难道还有什么多选操作是不能实现的吗?所以是不是应该考 虑放弃第一节中描述的那种方法了呢?遗憾的是很多android开发者即使是用了CHOICE_MODE_MULTIPLE,仍然没有去利用这些 ListView自带的功能,估计是根本不知道该CHOICE_MODE_MULTIPLE的 特性吧,这其实也是android程序员与ios程序员真正存在差距的地方。


CHOICE_MODE_MULTIPLE实战


先看看效果图


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package com.example.listmultichoise;
import android.os.Bundle;
import android.app.ActionBar;
import android.app.Activity;
import android.util.Log;
import android.view.ActionMode;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ChoiceModeMultipleActivity extends Activity {
         ListView mListView =     null     ;
         MyListAdapter mAdapter;
         private View mMultiSelectActionBarView;
         private TextView mSelectedCount;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
         @Override
         protected void onCreate(Bundle savedInstanceState) {
             super     .onCreate(savedInstanceState);
             getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
             setContentView(R.layout.activity_list);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
             mListView = (ListView)findViewById(R.id.list);
             mAdapter =     new     MyListAdapter(     this     ,mListView);
             mListView.setAdapter(mAdapter);
             mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
             mListView.setOnItemClickListener(     new     OnItemClickListener() {
                 public void onItemClick(AdapterView<?> parent, View view, int position,
                         long id) {
                     mAdapter.notifyDataSetChanged();
                     updateSeletedCount();
                 }
             });
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
             if     (mMultiSelectActionBarView ==     null     ) {
                 mMultiSelectActionBarView = LayoutInflater.from(ChoiceModeMultipleActivity.     this     )
                     .inflate(R.layout.list_multi_select_actionbar,     null     );
                 mSelectedCount =
                     (TextView)mMultiSelectActionBarView.findViewById(R.id.selected_conv_count);
             }
             getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM,
                     ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_SHOW_HOME |
                     ActionBar.DISPLAY_SHOW_TITLE);
             getActionBar().setCustomView(mMultiSelectActionBarView);
             ((TextView)mMultiSelectActionBarView.findViewById(R.id.title)).setText(R.string.select_item);
         }
         @Override
         public boolean onCreateOptionsMenu(Menu menu) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
             getMenuInflater().inflate(R.menu.multi_select_menu, menu);
             return     true     ;
         }
         @Override
         public boolean onPrepareOptionsMenu(Menu menu) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
             MenuItem mItem = menu.findItem(R.id.action_slelect);
             if     (mListView.getCheckedItemCount() == mAdapter.getCount()){
                 mItem.setTitle(R.string.action_deselect_all);
             }     else     {
                 mItem.setTitle(R.string.action_select_all);
             }
             return     super     .onPrepareOptionsMenu(menu);
         }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
         @Override
         public boolean onOptionsItemSelected(MenuItem item) {
             switch     (item.getItemId()) {
             case     R.id.action_slelect:
                 if     (mListView.getCheckedItemCount() == mAdapter.getCount()){
                     unSelectedAll();
                 }     else     {
                     selectedAll();
                 }
                 mAdapter.notifyDataSetChanged();
                 break     ;
             default     :
                 break     ;
             }
             return     super     .onOptionsItemSelected(item);
         }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
         public void selectedAll(){
             for     (int i= 0; i< mAdapter.getCount(); i++){
                 mListView.setItemChecked(i,     true     );
             }
             updateSeletedCount();
         }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
         public void unSelectedAll(){
             mListView.clearChoices();
             updateSeletedCount();
         }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
         public void updateSeletedCount(){
             mSelectedCount.setText(Integer.toString(mListView.getCheckedItemCount()));
         }
}


代码解释:


首先设置ListView模式:


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mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);


定义一个adapter,当ListView的某个item被选中之后,将该Item的背景设置为蓝色,以标记为选中。不然虽然ListView知道该item被选中,但是界面上没表现出来。


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......
         public View getView(int position, View convertView, ViewGroup parent) {
             TextView tv;
             if     (convertView ==     null     ) {
                 tv = (TextView) LayoutInflater.from(mContext).inflate(
                         android.R.layout.simple_expandable_list_item_1, parent,
                         false     );
             }     else     {
                 tv = (TextView) convertView;
             }
             tv.setText(mStrings[position]);
             updateBackground(position , tv);
             return     tv;
         }
         @SuppressLint(     "NewApi"     )
         public void updateBackground(int position, View view) {
             int backgroundId;
             if     (mListView.isItemChecked(position)) {
                 backgroundId = R.drawable.list_selected_holo_light;
             }     else     {
                 backgroundId = R.drawable.conversation_item_background_read;
             }
             Drawable background = mContext.getResources().getDrawable(backgroundId);
             view.setBackground(background);
         }
......


在item每被点击一次中通知adapter,这样做的目的是为了让更新Ui以显示最新的选中状态。


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mListView.setOnItemClickListener(     new     OnItemClickListener() {
         public void onItemClick(AdapterView<?> parent, View view, int position,
                 long id) {
             mAdapter.notifyDataSetChanged();
             updateSeletedCount();
         }
});


其中mSelectedCount()作用是在actionbar中更新选中的数目。


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public void updateSeletedCount(){
            mSelectedCount.setText(Integer.toString(mListView.getCheckedItemCount()));
        }


上 面的代码实现了多选操作,但是在我选中一个item的时候,listView的onItemClick也同时触发,而一个ListView点击item的 后续操作一般是切换到另外一个界面,所以实际应用中,我们还需要设置一个标志位,用来区别当前是多选状态还是普通状态 ,如果是多选状态,调用ListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);  如果是普通状态调用mListView.setChoiceMode(ListView.CHOICE_MODE_NONE); CHOICE_MODE_MULTIPLE模式的特点在于他本身没有排斥性,在能选择item的情况下,也可以响应普通点击事件。为了解决这个问题 ,在android3.0之后增加了CHOICE_MODE_MULTIPLE_MODAL模式。


二、使用ListViiewCHOICE_MODE_MULTIPLE模式

CHOICE_MODE_MULTIPLE_MODAL和CHOICE_MODE_MULTIPLE恰恰相反,他是对普通点击操作和多选操作是排斥的,一旦有一个item被选中,即进入到多选状态,item的onclick事件被屏蔽。这种排斥性也是他比CHOICE_MODE_MULTIPLE多了个MODAL的原因。此外CHOICE_MODE_MULTIPLE_MODAL还结合了android3.0的actionmode,当进入多选状态,actionbar的位置会显示新的菜单。

我们来看看CHOICE_MODE_MULTIPLE_MODAL模式的实现原理:


如何实现两种状态的互斥:当 点击一个item的时候absListView中会调用performItemClick,如果是CHOICE_MODE_MULTIPLE,则该 item点击一次,mCheckStates中相应位置的状态变更一次,但是CHOICE_MODE_MULTIPLE_MODAL模式不同,必须要 mChoiceActionMode!= null

的情况下,才会去变更mCheckStates中相应位置的状态;不光如此,如果mChoiceActionMode!= null

,他还会阻挡ItemClick事件的继续传播,从而屏蔽了ListView OnItemClickListener的onItemClick方法。


如何启用actionmode:一 般我们使用actionmode都是在activity中调用startActionMode,但是如果你要使用ListView的 CHOICE_MODE_MULTIPLE_MODAL,请不要这么做, 在absListView中有一个变量mChoiceActionMode,定义如下:


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ActionMode mChoiceActionMode;


当 长按item 或者是调用主动调用setItemChecked方法mChoiceActionMode将被实例化,而如果你是在activity中调用 startActionMode,那么虽然actionbar上的菜单变化了,ListView 中的mChoiceActionMode却没有实例化,刚刚我们谈到mChoiceActionMode==null 表示未进入到多选状态,所以这时你点击一个item其实还是普通的点击行为。

因此在CHOICE_MODE_MULTIPLE_MODAL模式下要启用多选操作,只有两种办法:

(1)长按当长按item ;

(2)主动调用ListView的setItemChecked(int position, boolean value)方法选中一个item。

但 是这两种进入多选状态的方法都有一个弊端,那就是进入多选状态之后,总是有一个item是被选中的, 方法(1)中长按item,被按的item被选中,这种结果是合理的可以接受的,但是如果你想主动进入多选状态(比如我在点击actionbar的某个菜 单的时候想进入多选状态),就必须采用方法(2):调用setItemChecked,这就出现个问题,你该让哪个item被选中呢?貌似最合理的该是一 个都不选中吧,我只是进入到这个状态,还没有开始选呢。幸运的是,我们可以使用一些技巧,实现能主动进入多选状态,且没有一个item被选中。

思路是我们先让第一个item被选中,这样Listview就进入多选状态,然后我们再清除被选中item的状态,代码如下:


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if     (item.getItemId() == R.id.action_choice){
          mListView.setItemChecked(0,     true     );
          mListView.clearChoices();
}


有些人可能会问,按照上面的思路,为什么不这样实现呢:


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if     (item.getItemId() == R.id.action_choice){
                                                                                                                                                                                                                                                                                                                                                                         
          mListView.setItemChecked(0,     true     );
          mListView.setItemChecked(0,     false     );
}


嘿嘿,刚刚我们提到ListView CHOICE_MODE_MULTIPLE_MODAL模式中,一旦有一个item被选中,即进入到多选状态,而他还有个相反的特性,一旦所有的Item被主动的设置为未选中,则退出多选状态,mChoiceActionMode会调用自己的finish()方法。为什么呢?在MultiChoiceModeWrapper类中:

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@Override
public void onItemCheckedStateChanged(ActionMode mode,
             int position, long id, boolean checked) {
         mWrapped.onItemCheckedStateChanged(mode, position, id, checked);
         // If there are no items selected we no longer need the selection mode.
         if     (getCheckedItemCount() == 0) {
             mode.finish();
         }
}


好了我们来实现一个CHOICE_MODE_MULTIPLE_MODAL模式下的多选操作:


代码:

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package com.example.listmultichoise;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.ActionMode;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ChoiceModeMultipleModalActivity extends Activity {
         ListView mListView =     null     ;
         MyListAdapter mAdapter;
         ModeCallback mCallback;
                                                                                                                        
         @Override
         protected void onCreate(Bundle savedInstanceState) {
             super     .onCreate(savedInstanceState);
             setContentView(R.layout.activity_list);
                                                                                                                            
             mListView = (ListView)findViewById(R.id.list);
             mAdapter =     new     MyListAdapter(     this     ,mListView);
             mListView.setAdapter(mAdapter);
                                                                                                                            
             mCallback =     new     ModeCallback();
             mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
             mListView.setMultiChoiceModeListener(mCallback);
             mListView.setOnItemClickListener(     new     OnItemClickListener() {
                 public void onItemClick(AdapterView<?> parent, View view, int position,
                         long id) {
                        Toast.makeText(ChoiceModeMultipleModalActivity.     this     ,     "选择了一个item"     , 300).show();
                 }
             });
         }
         @Override
         public boolean onCreateOptionsMenu(Menu menu) {
             // Inflate the menu; this adds items to the action bar if it is present.
             getMenuInflater().inflate(R.menu.main, menu);
             return     true     ;
         }
         @Override
         public boolean onOptionsItemSelected(MenuItem item) {
             if     (item.getItemId() == R.id.action_choice){
                 //这里使用了一点技巧来实现处于选中状态 但是0个item 被选择
                 mListView.setItemChecked(0,     true     );
                 mListView.clearChoices();
                 mCallback.updateSeletedCount();
             }
             return     super     .onOptionsItemSelected(item);
         }
                                                                                                                        
         private class ModeCallback implements ListView.MultiChoiceModeListener {
             private View mMultiSelectActionBarView;
             private TextView mSelectedCount;
             @Override
             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                 // actionmode的菜单处理
                 MenuInflater inflater = getMenuInflater();
                 inflater.inflate(R.menu.multi_select_menu, menu);
                 if     (mMultiSelectActionBarView ==     null     ) {
                     mMultiSelectActionBarView = LayoutInflater.from(ChoiceModeMultipleModalActivity.     this     )
                         .inflate(R.layout.list_multi_select_actionbar,     null     );
                     mSelectedCount =
                         (TextView)mMultiSelectActionBarView.findViewById(R.id.selected_conv_count);
                 }
                 mode.setCustomView(mMultiSelectActionBarView);
                 ((TextView)mMultiSelectActionBarView.findViewById(R.id.title)).setText(R.string.select_item);
                 return     true     ;
             }
             @Override
             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                 if     (mMultiSelectActionBarView ==     null     ) {
                     ViewGroup v = (ViewGroup)LayoutInflater.from(ChoiceModeMultipleModalActivity.     this     )
                         .inflate(R.layout.list_multi_select_actionbar,     null     );
                     mode.setCustomView(v);
                     mSelectedCount = (TextView)v.findViewById(R.id.selected_conv_count);
                 }        
                 //更新菜单的状态
                 MenuItem mItem = menu.findItem(R.id.action_slelect);
                 if     (mListView.getCheckedItemCount() == mAdapter.getCount()){
                     mItem.setTitle(R.string.action_deselect_all);
                 }     else     {
                     mItem.setTitle(R.string.action_select_all);
                 }
                 return     true     ;
             }
             @Override
             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                 switch     (item.getItemId()) {
                     case     R.id.action_slelect:
                         if     (mListView.getCheckedItemCount() == mAdapter.getCount()){
                             unSelectedAll();
                         }     else     {
                             selectedAll();
                         }
                         mAdapter.notifyDataSetChanged();
                         break     ;
                     default     :
                         break     ;
                 }
                 return     true     ;
             }
             @Override
             public void onDestroyActionMode(ActionMode mode) {
                 mListView.clearChoices();
             }
             @Override
             public void onItemCheckedStateChanged(ActionMode mode,
                     int position, long id, boolean checked) {
                 updateSeletedCount();
                 mode.invalidate();
                 mAdapter.notifyDataSetChanged();
             }
                                                                                                                            
             public void updateSeletedCount(){
                 mSelectedCount.setText(Integer.toString(mListView.getCheckedItemCount()));
             }
         }
         public void selectedAll(){
             for     (int i= 0; i< mAdapter.getCount(); i++){
                 mListView.setItemChecked(i,     true     );
             }
             mCallback.updateSeletedCount();
         }
                                                                                                                        
         public void unSelectedAll(){
             mListView.clearChoices();
             mListView.setItemChecked(0,     false     );
             mCallback.updateSeletedCount();
         }
}

这里需要提醒的是虽然ListView的mActionMode我们不能直接操作,但是actionmode的回调方法是可以在activity中设置的:

1
mListView.setMultiChoiceModeListener(mCallback);

而且这个回调方法比一般的actionmode回调方法多了个onItemCheckedStateChanged

1
2
3
4
5
@Override
public void onItemCheckedStateChanged(ActionMode mode,
             int position, long id, boolean checked) {
         ....
}


demo我已经上传到了csdn:http://download.csdn.net/detail/jianghejie123/8126071

这是我的博客链接 http://jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/1105/1906.html


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