How to show installed app list in a listview without Checkbox getting unchecked when listview is scrolled?

Question

My goal is to display the list of installed apps in a custom listview (within an Activity) without checkbox getting unchecked (when listview is scrolled).

<

Answer 1

Activity

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

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.os.Bundle;
import android.widget.ListView;

public class AppScreen extends Activity {
private ListView list;
ArrayList<Datamodel> res;
MyAdapter _adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.app_screen);

    list = (ListView) findViewById(R.id.list);
    List<PackageInfo> _myapps = getPackageManager().getInstalledPackages(0);
    res = new ArrayList<Datamodel>();
    for (int i = 0; i < _myapps.size(); i++) {
        PackageInfo p = _myapps.get(i);

        Datamodel _model  = new Datamodel();
        _model.setAppname(p.applicationInfo.loadLabel(getPackageManager()).toString());
        res.add(_model);
        System.out.println("ajajajja" + res.size() + res.get(i).getAppname());
    }
    _adapter = new MyAdapter(getApplicationContext(), res);
    _adapter.notifyDataSetChanged();
    list.setAdapter(_adapter);


}

}

Datamodel class

public class Datamodel {

public String appname = "";
private boolean selected;

public String getAppname() {
    return appname;
}

public void setAppname(String appname) {
    this.appname = appname;
}

public boolean isSelected() {
    return selected;
}

public void setSelected(boolean isChecked) {
    this.selected = isChecked;
}

}

Adapter class

public class MyAdapter extends BaseAdapter {
Context _ctx;
LayoutInflater inflater;
public ArrayList<Datamodel> data;

public MyAdapter(Context c, ArrayList<Datamodel> _arraylist) {
    this._ctx = c;
    this.data = _arraylist;
}

@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    inflater = (LayoutInflater) _ctx.getApplicationContext()
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View itemView = inflater.inflate(R.layout.inflator, parent, false);
    final CheckBox checks = (CheckBox) itemView.findViewById(R.id.b);
    final TextView _setappname = (TextView) itemView.findViewById(R.id.a);
    checks.setChecked(data.get(position).isSelected());

    Datamodel obj = data.get(position);
    _setappname.setText(obj.getAppname());
    checks.setTag(position);

    checks.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {                    
            int getPosition = (Integer) buttonView.getTag();
            Datamodel _obj = data.get(getPosition);
            data.get(position).setSelected(isChecked);
            String ss = _obj.getAppname();
            System.out.println("pos is" + getPosition);

        }
    });

    return itemView;
}

}

Activity XML

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.installedapps.AppScreen" >

<ListView 
    android:id="@+id/list"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent">

</ListView>

Inflator xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center"
android:layout_gravity="center"
android:orientation="horizontal"
android:weightSum="2" >

<TextView
    android:id="@+id/a"
    android:layout_width="0dp"
    android:layout_height="fill_parent"
    android:textColor="#000"
    android:layout_gravity="center"
    android:gravity="center"
    android:layout_weight="1.7" />

<CheckBox
    android:id="@+id/b"
    android:layout_width="0dp"
     android:layout_gravity="center"
    android:gravity="center"
    android:layout_weight="0.3"
    android:layout_height="wrap_content" />

</LinearLayout>