Android 如何使用复选框和自定义适配器从 Listview 中获取选定的列表项？

How to get selected list items from a Listview with checkBox and Custom Adapter?

提问by Akram

I have a ListViewwith CheckBoxon it. and i am using Custom Adapterto populate the ListView.

我有一个ListView用CheckBox就可以了。我正在使用Custom Adapter填充ListView.

In my xmlfile i have a Buttonat bottom. what i want is let user select number of rows in ListViewand when he/she clicked on the Buttonget the position of the selected items so that i could get the object for particular row for further calculations.

在我的xml文件中，我Button在底部有一个。我想要的是让用户选择行数，ListView当他/她点击时，Button获取所选项目的位置，以便我可以获取特定行的对象以进行进一步计算。

采纳答案by Vipul Shah

Below Snippet does exactly what you want.

下面的 Snippet 正是你想要的。

package com.windrealm.android;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class PlanetsActivity extends Activity
{

    private ListView mainListView;
    private Planet[] planets;
    private ArrayAdapter<Planet> listAdapter;
    private Button check;
    private Context context;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        context = PlanetsActivity.this;
        check = (Button) findViewById(R.id.check);
        // Find the ListView resource.
        mainListView = (ListView) findViewById(R.id.mainListView);

        // When item is tapped, toggle checked properties of CheckBox and
        // Planet.
        mainListView
                .setOnItemClickListener(new AdapterView.OnItemClickListener()
                {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View item,
                            int position, long id)
                    {
                        Planet planet = listAdapter.getItem(position);
                        planet.toggleChecked();
                        PlanetViewHolder viewHolder = (PlanetViewHolder) item
                                .getTag();
                        viewHolder.getCheckBox().setChecked(planet.isChecked());
                    }
                });

        // Create and populate planets.
        planets = (Planet[]) getLastNonConfigurationInstance();
        if (planets == null)
        {
            planets = new Planet[]
            { new Planet("Mercury"), new Planet("Venus"), new Planet("Earth"),
                    new Planet("Mars"), new Planet("Jupiter"),
                    new Planet("Saturn"), new Planet("Uranus"),
                    new Planet("Neptune"), new Planet("Ceres"),
                    new Planet("Pluto"), new Planet("Haumea"),
                    new Planet("Makemake"), new Planet("Eris") };
        }
        ArrayList<Planet> planetList = new ArrayList<Planet>();
        planetList.addAll(Arrays.asList(planets));

        // Set our custom array adapter as the ListView's adapter.
        listAdapter = new PlanetArrayAdapter(this, planetList);
        mainListView.setAdapter(listAdapter);

        check.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View view)
            {
                for (int i = 0; i < listAdapter.getCount(); i++)
                {
                    Planet planet = listAdapter.getItem(i);
                    if (planet.isChecked())
                    {
                        Toast.makeText(context,
                                planet.getName() + " is Checked!!",
                                Toast.LENGTH_SHORT).show();
                    }
                }

            }
        });
    }

    /** Holds planet data. */
    private static class Planet
    {
        private String name = "";
        private boolean checked = false;

        public Planet()
        {
        }

        public Planet(String name)
        {
            this.name = name;
        }

        public Planet(String name, boolean checked)
        {
            this.name = name;
            this.checked = checked;
        }

        public String getName()
        {
            return name;
        }

        public void setName(String name)
        {
            this.name = name;
        }

        public boolean isChecked()
        {
            return checked;
        }

        public void setChecked(boolean checked)
        {
            this.checked = checked;
        }

        public String toString()
        {
            return name;
        }

        public void toggleChecked()
        {
            checked = !checked;
        }
    }

    /** Holds child views for one row. */
    private static class PlanetViewHolder
    {
        private CheckBox checkBox;
        private TextView textView;

        public PlanetViewHolder()
        {
        }

        public PlanetViewHolder(TextView textView, CheckBox checkBox)
        {
            this.checkBox = checkBox;
            this.textView = textView;
        }

        public CheckBox getCheckBox()
        {
            return checkBox;
        }

        public void setCheckBox(CheckBox checkBox)
        {
            this.checkBox = checkBox;
        }

        public TextView getTextView()
        {
            return textView;
        }

        public void setTextView(TextView textView)
        {
            this.textView = textView;
        }
    }

    /** Custom adapter for displaying an array of Planet objects. */
    private static class PlanetArrayAdapter extends ArrayAdapter<Planet>
    {

        private LayoutInflater inflater;

        public PlanetArrayAdapter(Context context, List<Planet> planetList)
        {
            super(context, R.layout.simplerow, R.id.rowTextView, planetList);
            // Cache the LayoutInflate to avoid asking for a new one each time.
            inflater = LayoutInflater.from(context);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent)
        {
            // Planet to display
            Planet planet = (Planet) this.getItem(position);

            // The child views in each row.
            CheckBox checkBox;
            TextView textView;

            // Create a new row view
            if (convertView == null)
            {
                convertView = inflater.inflate(R.layout.simplerow, null);

                // Find the child views.
                textView = (TextView) convertView
                        .findViewById(R.id.rowTextView);
                checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);

                // Optimization: Tag the row with it's child views, so we don't
                // have to
                // call findViewById() later when we reuse the row.
                convertView.setTag(new PlanetViewHolder(textView, checkBox));

                // If CheckBox is toggled, update the planet it is tagged with.
                checkBox.setOnClickListener(new View.OnClickListener()
                {
                    public void onClick(View v)
                    {
                        CheckBox cb = (CheckBox) v;
                        Planet planet = (Planet) cb.getTag();
                        planet.setChecked(cb.isChecked());
                    }
                });
            }
            // Reuse existing row view
            else
            {
                // Because we use a ViewHolder, we avoid having to call
                // findViewById().
                PlanetViewHolder viewHolder = (PlanetViewHolder) convertView
                        .getTag();
                checkBox = viewHolder.getCheckBox();
                textView = viewHolder.getTextView();
            }

            // Tag the CheckBox with the Planet it is displaying, so that we can
            // access the planet in onClick() when the CheckBox is toggled.
            checkBox.setTag(planet);

            // Display planet data
            checkBox.setChecked(planet.isChecked());
            textView.setText(planet.getName());

            return convertView;
        }

    }

    public Object onRetainNonConfigurationInstance()
    {
        return planets;
    }
}

回答by Biojayc

In the customadapter's getview method, do

在 customadapter 的 getview 方法中，执行

//use the actual id of your checkbox of course
Checkbox checkbox = (CheckBox)findViewById(R.id.checkbox); 
checkbox.setFocusable(false);
checkbox.setFocusableInTouchMode(false);

now the checkbox is clickable as is the listitem.

现在复选框和列表项一样可点击。

回答by user_CC

To solve this problem you will have to create a custom Item class which will represent your individual checkboxes on the list. The array of these items will then be used by the adapter class to display your check boxes.

要解决此问题，您必须创建一个自定义 Item 类，该类将代表您在列表中的各个复选框。然后适配器类将使用这些项目的数组来显示您的复选框。

This Item class will have a boolean variable isSelected which will determine if the checkbox is selected or not. You will have to set the value of this variable in your OnClick Method of your custom adapter class

这个 Item 类将有一个布尔变量 isSelected ，它将确定复选框是否被选中。您必须在自定义适配器类的 OnClick 方法中设置此变量的值

For Example

例如

    class CheckBoxItem{

    boolean isSelected;


    public void setSelected(boolean val) {
            this.isSelected = val;
        }

        boolean isSelected(){
            return isSelected;

        }   

    }

For your CustomAdapter Class which look like following:

对于您的 CustomAdapter 类，如下所示：

    public class ItemsAdapter extends ArrayAdapter implements OnClickListener { 

// you will have to initialize below in the constructor 
    CheckBoxItem items[];



    // You will have to create your check boxes here and set the position of your check box
    /// with help of setTag method of View as defined in below method, you will use this later // in your onClick method 

    @Override 
        public View getView(int position, View convertView, ViewGroup parent) { 
            View v = convertView; 



            CheckBox cBox = null;

            if (v == null) { 
                LayoutInflater vi = (LayoutInflater) apUI.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
                v = vi.inflate(R.layout.attachphoto, null);     

            } 



            CheckBoxItemItem it = items[position];      

            cBox =(CheckBox) v.findViewById(R.id.apCheckBox);
            cBox.setOnClickListener(this);
            cBox.setTag(""+position);       


            Log.d(TAG, "  CHECK BOX IS: "+cBox+ "   Check Box selected Value: "+cBox.isChecked()+"  Selection: "+it.isSelected());
            if(cBox != null){
                cBox.setText("");
                cBox.setChecked(it.isSelected());
            }       


            return v; 
        } 


        public void onClick(View v) {
            CheckBox cBox =(CheckBox) v.findViewById(R.id.apCheckBox);
            int position = Integer.parseInt((String) v.getTag());

            Log.d(TAG, "CLicked ..."+cBox.isChecked());

            items[position].setSelected(cBox.isChecked());              
        } 

    }

Later you will will declare and array of your CheckBoxItem class which will be contained by your Adapter class in this case it will be ItemsAdapter class.

稍后，您将声明 CheckBoxItem 类的数组，在这种情况下，您的 Adapter 类将包含它的 ItemsAdapter 类。

Then when the user presses the button you can iterate through all the items in the array and check which one is selected by using the isSelected() method of CheckBoxItem class.

然后当用户按下按钮时，您可以遍历数组中的所有项目，并使用 CheckBoxItem 类的 isSelected() 方法检查选择了哪一个。

In your activity you will have:

在您的活动中，您将拥有：

ArrayList getSelectedItems(){

ArrayList selectedItems = new ArrayList();

int size = items.length;

        for(int i = 0; i<size; i++){
            CheckBoxItem cItem = items[i];
            if(cItem.isSelected()){                 
                selectedItems.add(cItem);                   
            }           
        }

return selectedItems;

}

回答by Abhiatreyas

I had the exact same problem. I solved it in this way

我有同样的问题。我是这样解决的

public class myActivity extends Activity  {
//ActionBarSherlock mSherlock = ActionBarSherlock.wrap(this);
public ListView listview;
private ArrayList<Object> itemlist=new ArrayList<Object>();
Button button;
private myAdapter adapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listview=(ListView)findViewById(R.id.listview1);
    button=(Button)findViewById(R.id.button1);
    /*add some data to ur list*/ itemlist.add(something);
    adapter=new Adapter(myActivity.this, 0, itemlist);
    listview.setAdapter(adapter);
    **listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    listview.setItemsCanFocus(false);**
    button.setOnClickListner(new OnClickListner()
    {
     @Override
     public void OnClick(View v)
     {
      /* this returns the checked item positions in the listview*/
      **ArrayList<Integer> itempositions=adapter.getcheckeditemcount();**

    for(int i:itempositions)
    {
             /* This is the main part...u can retrieve the object in the listview which is checked and do further calculations with it*/
        **Object info=adapter.getItem(i);**
                          Log.d(TAG,"checked object info= ",info.something);
                 }
     }
    });
}


private class myAdapter extends ArrayAdapter<Object>  {

    private Context context;
    private ArrayList<Object> list;
    **private ArrayList<Integer> checkedpositions;**


    public myAdapter(Context localContext,int textViewResourceId, ArrayList<Object> objects) {
        super(localContext,textViewResourceId,objects);
        context = localContext;
        this.list=objects;
        this.checkedpositions=new  ArrayList<Integer>();
        //Log.d("adapter","list size= "+objects.size());
    }

@Override       
    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView picturesView;
        View v = convertView;
        TextView Mainitem;
        final CheckBox check;

       if (v == null) 
       {
           LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           v = vi.inflate(R.layout.albumview, null);


           Object item=list.get(position);
           if(item!=null)
           {

               check = (CheckBox)v.findViewById(R.id.checkBox1);
                   /* set a tag for chekbox with the current view position */
               **check.setTag(position);**
                   /*set a onchecked change listner for listning to state of checkbox toggle */
               check.setOnCheckedChangeListener(new OnCheckedChangeListener() 
               { 
                   @Override
                   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                   {             
                                       /*get the tag of the checkbox...in this case this will give the (position of view)*/
                       Object tag=check.getTag();
                       if ( isChecked ) 
                       { 
                           // perform logic 
                           count++;
                           Log.d("Checkbox","added "+tag);
                           checkedpositions.add((Integer) tag);
                       } 
                       else
                       {
                           count--;
                           checkedpositions.remove(tag);
                           Log.d("Checkbox","removed "+(Integer)tag);
                       }

               /* if u dont have a textview in ur listview then ignore this part */        
               Mainitem = (TextView) v.findViewById(R.id.textView1);
               Mainitem.setText(item.Album_name);

               } catch (IOException e) {
                     // TODO Auto-generated catch block
                     Log.d("error", "wall");
                 }

           }

       }

    return v;

    }
   /* Finally create a method which return the checkeditem postions in the listview */
**public ArrayList<Integer> getcheckeditemcount()
{
    return this.checkedpositions;
}**

}

}

I hope this helps.

我希望这有帮助。