Java 在mainActivity中查看frameLayout内的片段
我正在开发我的第一个android应用程序。 **Java 在mainActivity中查看frameLayout内的片段,java,android,android-fragments,Java,Android,Android Fragments,我正在开发我的第一个android应用程序。 ** 我想做什么: 1-在主活动中的框架布局中查看此空白片段: 片段映射.xml(片段xml文件) 4-MapFragment代码(我刚刚创建了一个新片段,这个java类是自动生成的) 出现此问题的原因是接口。你有两个选择 (1)在您的main活动中实施OnFragmentInteractionListener。像 public class MainActivity extends AppCompatActivity implements OnF
- 我想做什么:
片段映射.xml(片段xml文件) 4-MapFragment代码(我刚刚创建了一个新片段,这个java类是自动生成的)
出现此问题的原因是接口。你有两个选择 (1)在您的
main活动中实施OnFragmentInteractionListener
。像
public class MainActivity extends AppCompatActivity implements OnFragmentInteractionListener {
.......
@Override
void onFragmentInteraction(Uri uri){
....
}
}
(2)如果不需要接口,则从onAttach
中删除侦听器代码
@Override
public void onAttach(Context context) {
super.onAttach(context);
//remove code from here.
}
通过查看您的logcat响应进行故障排除。postMapFragment
code。我用logcast更新了这个问题。但是,我找不到解决方案。我认为AndroidManifiest.xml文件@BadrTanks中的一切都很好,我必须阅读MapFragment类中的注释,我将阅读它并找出我需要的内容!!。因此,如果我没有实现这个接口,我将无法与mainActivity中的片段进行交互!?如果您想与mainactivity交互,可以使用自定义方法实现接口。
public class MainActivity extends AppCompatActivity {
boolean activityIsReady= false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onResume() {
super.onResume();
activityIsReady = true;
}
@Override
protected void onPostResume() {
super.onPostResume();
showMap();
}
void showMap(){
if(activityIsReady == true) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.mapPlaceHolder, new MapFragment());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}
}
public class MapFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public MapFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MapFragment.
*/
// TODO: Rename and change types and number of parameters
public static MapFragment newInstance(String param1, String param2) {
MapFragment fragment = new MapFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_map, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
2018-12-10 13:23:25.747 1496-2985/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-12-10 13:23:25.747 1496-2985/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-12-10 13:23:25.748 2732-6423/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-12-10 13:23:25.756 2732-6423/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-12-10 13:23:25.756 2732-6423/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
public class MainActivity extends AppCompatActivity implements OnFragmentInteractionListener {
.......
@Override
void onFragmentInteraction(Uri uri){
....
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
//remove code from here.
}