Implementing CheckAll and UncheckAll for a listview in Android

In this article we are implementing the operations “CheckAll” and “UncheckAll”  for a listview in Android

1. Create an Android project named ListViewCheckAll

Figure 1 : Create New Android Project

2.Select build target for this application

Figure 2 : Select Android Build Target

3. Enter application details

Figure 3 : Application Details

4. Open and update the file res/values/strings.xml with the given below code

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">ListViewCheckAll</string>
    <string name="strAll">All</string>
</resources>

5. Open and update the file res/layout/main.xml with the given below code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="right"
        android:paddingRight="5dp"
    >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/strAll"
        />

        <CheckBox
            android:id="@+id/chkAll"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
        />

    </LinearLayout>

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:choiceMode="multipleChoice"
    />
</LinearLayout>

6. Open and update the file sr/in/wptrafficanalyzer/checkall/MainActivity.java with the given below code

package in.wptrafficanalyzer.checkall;

import android.app.ListActivity;
import android.os.Bundle;
import android.util.SparseBooleanArray;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;

public class MainActivity extends ListActivity {

    /** String array used as the datasource for the ArrayAdapter of the listview **/
    String[] countries = new String[] {
        "India",
        "Pakistan",
        "Sri Lanka",
        "Bangladesh",
        "China",
        "Afghanistan"
    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /** Defining array adapter to store items for the listview **/
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, countries);

        /** Setting the arrayadapter for this listview  **/
        getListView().setAdapter(adapter);

        /** Defining checkbox click event listener **/
        OnClickListener clickListener = new OnClickListener() {

            @Override
            public void onClick(View v) {
                CheckBox chk = (CheckBox) v;
                int itemCount = getListView().getCount();
                for(int i=0 ; i < itemCount ; i++){
                    getListView().setItemChecked(i, chk.isChecked());
                }
            }
        };

        /** Defining click event listener for the listitem checkbox */
        OnItemClickListener itemClickListener = new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
            CheckBox chk = (CheckBox) findViewById(R.id.chkAll);
            int checkedItemCount = getCheckedItemCount();

            if(getListView().getCount()==checkedItemCount)
                chk.setChecked(true);
            else
                chk.setChecked(false);
            }
        };

        /** Getting reference to checkbox available in the main.xml layout */
        CheckBox chkAll =  ( CheckBox ) findViewById(R.id.chkAll);

        /** Setting a click listener for the checkbox **/
        chkAll.setOnClickListener(clickListener);

        /** Setting a click listener for the listitem checkbox **/
        getListView().setOnItemClickListener(itemClickListener);

    }

    /**
    *
    * Returns the number of checked items
    */
    private int getCheckedItemCount(){
        int cnt = 0;
        SparseBooleanArray positions = getListView().getCheckedItemPositions();
        int itemCount = getListView().getCount();

        for(int i=0;i<itemCount;i++){
            if(positions.get(i))
                cnt++;
        }
    return cnt;
    }
}

7. Application in execution

Figure 4: CheckAll Android Application in execution

8. Download the source code

Implementing CheckAll and UnCheck All 153.18 KB

Download Source

9. Testing the Android Application

The application developed in this article is tested in the article titled “Testing CheckAll and UnCheckAll of Android ListView using Android Testing Framework“.

10. Reference

http://developer.android.com/guide/index.html

How to hire me?

I am George Mathew, working as software architect and Android app developer at wptrafficanalyzer.in

You can hire me on hourly basis or on project basis for Android applications development.

For hiring me, please mail your requirements to info@wptrafficanalyzer.in.

My other blogs
store4js.blogspot.com

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Tags: checkbox, ListActivity, listview, multiplechoice