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How to bind data from a database to an Android CheckBox in a ListView?
This example demonstrates how to bind data from a database to an Android CheckBox in a ListView.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content" tools:ignore="MissingConstraints" /> </androidx.constraintlayout.widget.ConstraintLayout>
Step 3 − Add the following code to res/layout/row_item.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="10dp" android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/txtName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_centerVertical="true" android:textSize="16sp" /> <CheckBox android:id="@+id/checkBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:layout_alignParentTop="true" /> </RelativeLayout>
Step 4 − Add the following code to src/MainActivity.java
package com.app.sample;
import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
ArrayList dataModels;
ListView listView;
private CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
dataModels = new ArrayList();
dataModels.add(new DataModel("Apple Pie", false));
dataModels.add(new DataModel("Banana Bread", false));
dataModels.add(new DataModel("Cupcake", false));
dataModels.add(new DataModel("Donut", true));
dataModels.add(new DataModel("Eclair", true));
dataModels.add(new DataModel("Froyo", true));
dataModels.add(new DataModel("Gingerbread", true));
dataModels.add(new DataModel("Honeycomb", false));
dataModels.add(new DataModel("Ice Cream Sandwich", false));
dataModels.add(new DataModel("Jelly Bean", false));
dataModels.add(new DataModel("Kitkat", false));
dataModels.add(new DataModel("Lollipop", false));
dataModels.add(new DataModel("Marshmallow", false));
dataModels.add(new DataModel("Nougat", false));
adapter = new CustomAdapter(dataModels, getApplicationContext());
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
DataModel dataModel= (DataModel) dataModels.get(position);
dataModel.checked = !dataModel.checked;
adapter.notifyDataSetChanged();
}
});
}
}Step 5 − Add the following code to src/DataModel.java
package com.app.sample;
public class DataModel {
public String name;
boolean checked;
DataModel(String name, boolean checked) {
this.name = name;
this.checked = checked;
}
}Step 6 − Add the following code to src/CustomAdapter.java
package com.app.sample;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
import androidx.annotation.NonNull;
import java.util.ArrayList;
public class CustomAdapter extends ArrayAdapter{
private ArrayList dataSet;
Context mContext;
// View lookup cache
private static class ViewHolder {
TextView txtName;
CheckBox checkBox;
}
public CustomAdapter(ArrayList data, Context context) {
super(context, R.layout.row_item, data);
this.dataSet = data;
this.mContext = context;
}
@Override
public int getCount() {
return dataSet.size();
}
@Override
public DataModel getItem(int position) {
return (DataModel) dataSet.get(position);
}
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent){
ViewHolder viewHolder;
final View result;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item, parent, false);
viewHolder.txtName = (TextView) convertView.findViewById(R.id.txtName);
viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox);
result=convertView;
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
result=convertView;
}
DataModel item = getItem(position);
viewHolder.txtName.setText(item.name);
viewHolder.checkBox.setChecked(item.checked);
return result;
}
}Step 7 − Add the following code to Manifests/AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.app.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.
Updated on: 26-Nov-2019
673 Views
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