startActivity from ResolveInfo details

    Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    intent.setClassName(packageName, name);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | 
      Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
    startActivity(intent);

startActivity from ResolveInfo details

package com.example.androidlistapps;

import java.util.List;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;

public class MainActivity extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        
        Intent intent = new Intent(Intent.ACTION_MAIN, null);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> intentList = getPackageManager().queryIntentActivities(intent, 0);
        
        setListAdapter(new ArrayAdapter<ResolveInfo>(
          this, 
          android.R.layout.simple_list_item_1, 
          intentList));
        
        Toast.makeText(getApplicationContext(), 
          "no of activities: " + intentList.size(), 
          Toast.LENGTH_LONG).show();
    }

 @Override
 protected void onListItemClick(ListView l, View v, int position, long id) {
  
  PackageManager packageManager = getPackageManager();
  ResolveInfo resolveInfo = (ResolveInfo)l.getItemAtPosition(position);
  ActivityInfo activityInfo = resolveInfo.activityInfo;

  AlertDialog.Builder appInfoDialog = new AlertDialog.Builder(MainActivity.this);
  
  CharSequence label = resolveInfo.loadLabel(packageManager);
  appInfoDialog.setTitle(label);
  
  //load icon
  ImageView icon = new ImageView(getApplicationContext());
     icon.setImageDrawable(resolveInfo.loadIcon(packageManager));
     LayoutParams iconLayoutParams = new LayoutParams(
       LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     icon.setLayoutParams(iconLayoutParams);
     
     //load package and class name
  final String name = activityInfo.name;
  final String packageName = activityInfo.applicationInfo.packageName;
  final String className = activityInfo.applicationInfo.className;
  TextView textName = new TextView(getApplicationContext());
  textName.setText("Name: " + name);
  TextView textPackageName = new TextView(getApplicationContext());
  textPackageName.setText("PackageName: " + packageName);
  TextView textClassName = new TextView(getApplicationContext());
  textClassName.setText("ClassName: " + className);
     
     LinearLayout dialogLayout = new LinearLayout(getApplicationContext());
     LayoutParams dialogLayoutParams = new LayoutParams(
       LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
     dialogLayout.setLayoutParams(dialogLayoutParams);
     
     dialogLayout.setOrientation(LinearLayout.VERTICAL);
     dialogLayout.addView(icon);
     dialogLayout.addView(textName);
     dialogLayout.addView(textPackageName);
     dialogLayout.addView(textClassName);
     
     ScrollView scrollView = new ScrollView(getApplicationContext());
     LayoutParams scrollViewLayoutParams = new LayoutParams(
       LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
     scrollView.setLayoutParams(scrollViewLayoutParams);
     scrollView.addView(dialogLayout);
     
     appInfoDialog.setView(scrollView);
         
     appInfoDialog.setNegativeButton("Cancel", null);
     appInfoDialog.setPositiveButton("Start App", 
       new DialogInterface.OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    intent.setClassName(packageName, name);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | 
      Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
    startActivity(intent);
    
   }
  });
     appInfoDialog.show();
  
 }
}