Comment obtenir les éléments de liste sélectionnés à partir d'une liste avec checkBox et adaptateur personnalisé?
J'ai une ListView avec CheckBox dessus. et j'utilise Custom Adapter pour renseigner la ListView.
Dans mon fichier xml, j'ai un Button en bas. Ce que je veux, c'est laisser l'utilisateur sélectionner le nombre de lignes dans ListView et quand il/elle clique sur la Button obtenir la position des éléments sélectionnés afin que je puisse obtenir l'objet d'une ligne particulière pour des calculs ultérieurs.
Ci-dessous, Snippet fait exactement ce que vous voulez.
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;
}
}
Dans la méthode getview du customadapter, faites
//use the actual id of your checkbox of course
Checkbox checkbox = (CheckBox)findViewById(R.id.checkbox);
checkbox.setFocusable(false);
checkbox.setFocusableInTouchMode(false);
maintenant, la case à cocher est cliquable de même que l'élément de liste.
J'ai eu exactement le même problème. Je l'ai résolu de cette façon
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;
}**
}
}
J'espère que ça aide.
Pour résoudre ce problème, vous devrez créer une classe Item personnalisée qui représentera vos cases à cocher individuelles dans la liste. Le tableau de ces éléments sera ensuite utilisé par la classe d'adaptateur pour afficher vos cases à cocher.
Cette classe d'élément aura une variable booléenne isSelected qui déterminera si la case à cocher est activée ou non. Vous devrez définir la valeur de cette variable dans votre méthode OnClick de votre classe d'adaptateur personnalisé.
Par exemple
class CheckBoxItem{
boolean isSelected;
public void setSelected(boolean val) {
this.isSelected = val;
}
boolean isSelected(){
return isSelected;
}
}
Pour votre classe CustomAdapter, qui se présente comme suit:
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());
}
}
Plus tard, vous déclarerez et organiserez votre classe CheckBoxItem qui sera contenue par votre classe Adapter dans ce cas, ce sera la classe ItemsAdapter.
Ensuite, lorsque l'utilisateur appuie sur le bouton, vous pouvez parcourir tous les éléments du tableau et vérifier lequel est sélectionné à l'aide de la méthode isSelected () de la classe CheckBoxItem.
Dans votre activité, vous aurez:
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;
}