List all installed activities

We can list all activities that can be performed for the given intent by calling PackageManager.queryIntentActivities(Intent intent, int flags).

package com.example.androidlistapps;

import java.util.List;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import android.app.ListActivity;
import android.content.Intent;
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();
    }

}

Next: Get application details via ResolveInfo