Java – crashes when uninstalling Android applications via intent

Why does my app crash when I try to call this function?

public void uninstall(){
    Intent intent;
    String packageName;

packageName = HelloWorldActivity.class.getPackage().getName();
    intent = new Intent(Intent.ACTION_DELETE);
    intent.setData(Uri.parse(packageName));
    startActivity(intent);      
}

Do I need any permissions to uninstall packages?
Do I need to add .toString() to .getName()?

The package URI scheme requires the “package” keyword before the actual package name, so try this:
packageName = "package:"+HelloWorldActivity.class.getPackage().getName();