Android gets the text of all checked checkboxes in listView

Question

Hi, I created a list with checkboxes in it ... but I don’t know how to get the selected checkbox. Here is the activity_main.xml code

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="top" android:orientation="vertical" tools:context=".MygamesActivity" > <ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginTop="20dp" /> </LinearLayout> 

another layout that has checkboxes to display in the list main.list_item.xml

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"> <CheckBox android:id="@+id/checkBox1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="CheckBox" /> </LinearLayout> 

and this is a class that extends the arrayadapter

 package com.wasiff.listview; import android.content.Context; import android.content.res.TypedArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.CheckBox; import android.widget.ImageView; import android.widget.TextView; public class CheckboxAdapter extends ArrayAdapter<String> { private LayoutInflater mInflater; private String[] mStrings; private TypedArray mIcons; private int mViewResourceId; public CheckboxAdapter(Context ctx,int viewResourceId,String[] strings){ super(ctx,viewResourceId,strings); mInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mStrings = strings; mViewResourceId = viewResourceId; } public int getCount(){ return mStrings.length; } public String getItem(int position){ return mStrings[position]; } public long getItemId(int position){ return 0; } public View getView(int position,View convertView,ViewGroup parent){ convertView = mInflater.inflate(mViewResourceId, null); CheckBox tv = (CheckBox)convertView.findViewById(R.id.checkBox1); tv.setText(mStrings[position]); return convertView; } } 

and this is my mainActivity class

 package com.wasiff.listview; import android.app.ListActivity; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.ListAdapter; import android.widget.ListView; public class MainActivity extends ListActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Context ctx = getApplicationContext(); Resources res = ctx.getResources(); String[] options = res.getStringArray(R.array.countrynames); setListAdapter((ListAdapter) new CheckboxAdapter(ctx,R.layout.main_list_item,options)); } @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; } } 

and finally i have all the countries saved in countries.xml in the values ​​folder

 <?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="countrynames" translatable="false"> <item>Bhutan</item> <item>Colombia</item> <item>India</item> <item>Pakistan</item> <item>Australia</item> <item>Srilanka</item> <item>England</item> </string-array> </resources> 

it shows the checkboxes in the listView, now I want to get the text of the checkboxes that have been checked and show in the toast at the click of a button (to check). I followed the orroid cookbook tutorial, but still I don't know how to set the listener

Answer 1

Add inside CheckboxAdapter.java

 ArrayList<String> selectedStrings = new ArrayList<String>(); 

Then inside the getView method

 tv.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { selectedStrings.add(tv.getText().toString()); }else{ selectedStrings.remove(tv.getText().toString()); } } }); 

Write a receiver that will return selectedStrings

 ArrayList<String> getSelectedString(){ return selectedStrings; } 

Answer 2

Perhaps this will help you:

 CheckBox cb; ListView mainListView = getListView(); for (int x = 0; x<mainListView.getChildCount();x++){ cb = (CheckBox)mainListView.getChildAt(x).findViewById(R.id.myCheckBox); if(cb.isChecked()){ doSomething(); } } 

Answer 3

In the approach, your own object can be passed to your Arrayadapter:

 class ArrayItem{ private String text; private boolean checked; ... (getter/setter) } 

and just put the used Array back from the Arrayadapter and read it.

 Arrayadaper...{ public ArrayList<ArrayItem> getList(){ return this.arrayList; } public View getView(int position,View convertView,ViewGroup parent){ ArrayItem item = this.arrayList.get(position) convertView = mInflater.inflate(mViewResourceId, null); CheckBox tv = (CheckBox)convertView.findViewById(R.id.checkBox1); tv.setCheckChangeListener... //item.setChecked(true:false) tv.setText(mStrings[position]); return convertView; } } } 

You can scroll through the list and just manipulate elements where == true is checked

Hope this helps.

Answer 4

 SparseBooleanArray checked = listView1.getCheckedItemPositions(); ArrayList<String> selectedItems = new ArrayList<String>(); for (int i = 0; i < len; i++) { if (checked.get(i)) selectedItems.add((String) adapter.getItem(i)); } String[] outputStrArr = new String[selectedItems.size()]; for (int i = 0; i < selectedItems.size(); i++) { outputStrArr[i] = selectedItems.get(i); }