Question

Anyone please clarify my doubts in this program : –

BackUpActivity.java : –

public class BackUpActivity extends Activity
{
//Use ArrayList to store the installed non-system apps
ArrayList<AppInfo> appList = new ArrayList<AppInfo>();

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

//        List<ApplicationInfo> packages = getPackageManager().getInstalledApplications(0);
    List<PackageInfo> packages = getPackageManager().getInstalledPackages(0);
    for(int i=0; i<packages.size(); i++)
    { 
        PackageInfo packageInfo = packages.get(i);
        AppInfo tmpInfo = new AppInfo();
        tmpInfo.appName =     packageInfo.applicationInfo.loadLabel(getPackageManager()).toString(); 
        tmpInfo.packageName = packageInfo.packageName; 
        tmpInfo.versionName = packageInfo.versionName; 
        tmpInfo.versionCode = packageInfo.versionCode; 
        tmpInfo.appIcon = packageInfo.applicationInfo.loadIcon(getPackageManager());
        //  Only display the non-system app info
        if((packageInfo.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)==0)
        {
            appList.add(tmpInfo);
        }
    }
    for(int i=0;i<appList.size();i++)
    {
        appList.get(i).print();
    }

    //Populate data to listView
    ListView app_listView=(ListView)findViewById(R.id.listview1);
    AppAdapter appAdapter=new AppAdapter(BackUpActivity.this,appList);

    //app_listView.setAdapter(appAdapter);
    app_listView.setDividerHeight(5);
    if(app_listView!=null)
    {
        app_listView.setAdapter(appAdapter);
    }
}
public class AppAdapter extends BaseAdapter 
{
    Context context;
    ArrayList<AppInfo> dataList=new ArrayList<AppInfo>();
    public AppAdapter(Context context,ArrayList<AppInfo> inputDataList)
    {
        this.context=context;
        dataList.clear();
        for(int i=0;i<inputDataList.size();i++)
        {
            dataList.add(inputDataList.get(i));
        }
    }
    @Override
    public int getCount()
    {
        // TODO Auto-generated method stub
        return dataList.size();
    }

    @Override
    public Object getItem(int position)
    {
        // TODO Auto-generated method stub
        return dataList.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {           
        View v=convertView;
        final AppInfo appUnit=dataList.get(position);
        if(v==null)
        {
            LayoutInflater vi=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v=vi.inflate(R.layout.app_row, null);
            v.setClickable(true);
        }
        TextView appName=(TextView)v.findViewById(R.id.appName);
        ImageView appIcon=(ImageView)v.findViewById(R.id.icon);
        if(appName!=null)
            appName.setText(appUnit.appName);
        if(appIcon!=null)
            appIcon.setImageDrawable(appUnit.appIcon);
        return v;
    }
}
public boolean onCreateOptionsMenu(Menu menu) 
 {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu, menu);
    return true;
 }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
    {
        switch (item.getItemId())
        {               
            case R.id.BackUp:
            try
            {
                backup();
            }catch(Exception e){}                                   
//                  finish();
                break;
            case R.id.CheckAll:
                try
                {
                    checkall();
                }catch(Exception e){e.notify();}
                break;
            case R.id.Cancel:
            try
            {
                cancel();
            }catch(Exception e){}
            break;
        }
        return true;
    }
    public void backup()
    {
        Toast.makeText(this, "Backup Data", Toast.LENGTH_SHORT).show();
    }
    public void checkall()
    {
        CheckBox c = (CheckBox)this.findViewById(R.id.checkBox1);
        if (c.isChecked())
        { 
            c.setChecked(false); 
        } 
        else 
        {
            c.setChecked(true);
        }
    }
    public void cancel()
    {
        finish();
    }
}

AppInfo.java

package com.android.backup;

import android.graphics.drawable.Drawable;
import android.util.Log;

public class AppInfo 
{
public String appName="";
public String packageName="";
public String versionName="";
public int versionCode=0;
public Drawable appIcon=null;

public void print()
{
    Log.v("app","Name:"+appName+" Package:"+packageName);
    Log.v("app","Name:"+appName+" versionName:"+versionName);
    Log.v("app","Name:"+appName+" versionCode:"+versionCode);
}
}

It’s showing the results not properly, if i’m going to select the checkall button, it’ll not work properly.

Answer 1

You basically need some data structure to keep track of checked items.
you can use boolean array in your custom adapter.

for more info refer this link Custom listview with checkbox problem

listview with checkbox

if you are looking for an example try this http://appfulcrum.com/?p=281 tutorial which solves the checkbox problem in listview using shared preferences.