您可以尝试使用以下代码示例将Hello World应用程序添加到DHU的启动器菜单中：

public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);

   PackageManager pm = getApplicationContext().getPackageManager();
   ComponentName name = new ComponentName(getApplicationContext(), MainActivity.class);

   try {
       pm.setComponentEnabledSetting(name, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
       Intent intent = new Intent("android.intent.action.MAIN");
       intent.addCategory("android.intent.category.LAUNCHER");
       intent.setComponent(name);
       startActivity(intent);
   } catch (Exception e) {
       e.printStackTrace();
   }

} }

此代码将使用PackageManager将MainActivity添加到DHU的启动器菜单中。如果仍然看不到应用程序图标，请确保已在AndroidManifest.xml文件中声明该活动。