java - Android-DialogFragment不显示

我想在按下返回按钮时显示一个对话框，但是下面的代码无法执行并显示FragmentDialog。提前致谢。

  //BackPress
      public void onBackPressed() {

          TestDialogFragment test= new TestDialogFragment();
          test.newInstace();
            // Showing Alert Message

          Log.d("Video Backpressed", "sdfdf");
      }

TestDialogFragment

public static class TestDialogFragment extends DialogFragment {

    public static DialogFragment newInstace() {
        DialogFragment dialogFragment = new TestDialogFragment();
        return dialogFragment;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("TestDialogFragment");
        builder.setView(getContentView());
        Dialog dialog = builder.create();
        return dialog;
    }

    private View getContentView() {
        LayoutInflater inflater = getActivity().getLayoutInflater();
        return inflater.inflate(R.layout.dialog_fragment, null);
    }
    }

最佳答案

您没有调用show()的DialogFragment方法。在您的代码上，您仅创建了DialogFragment的实例。

public void onBackPressed() {

    TestDialogFragment test= new TestDialogFragment();
    test.show(getFragmentManager(), "my_dialog");

}