单击片段的操作栏后退按钮时重定向到主要活动

Question

这个项目与地图有关。在这里，登录后，它被重定向到地图活动。我认为地图活动是这里的主要活动。有导航抽屉，对于其中的每个选项(配置文件，设置，帮助等(，我都使用片段。

在导航抽屉中选择配置文件选项后，它将转到配置文件片段。现在，当我按下片段操作栏中的后退按钮时，我需要返回主活动(地图活动(。

地图活动不是导航抽屉中的选项。

地图活动.java

protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
mSearchText = (AutoCompleteTextView) findViewById(R.id.input_search);
mGps = (ImageView) findViewById(R.id.ic_gps);
mInfo=(ImageView) findViewById(R.id.place_info);
btnFindPath = (Button) findViewById(R.id.btnFindPath);
mDrawerlayout= (DrawerLayout) findViewById(R.id.drawer);
mToggle= new ActionBarDrawerToggle(this,mDrawerlayout,R.string.open,R.string.close);
mDrawerlayout.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
NavigationView nvDrawer = (NavigationView) findViewById(R.id.nv);
setupDrawerContent(nvDrawer);
getLocationPermission();
}

public void selectIterDrawer(MenuItem menuItem){
Fragment myFragment=null;
Class fragmentClass;
switch (menuItem.getItemId()){
case R.id.profile:
fragmentClass = Profile.class;
break;
case R.id.search:
fragmentClass = Search.class;
break;
case R.id.help:
fragmentClass = Help.class;
break;
case R.id.settings:
fragmentClass = Settings.class;
break;
case R.id.logout:
fragmentClass = Logout.class;
break;
default:
fragmentClass = Profile.class;
}
try {
myFragment = (Fragment) fragmentClass.newInstance();
}
catch (Exception e){
e.printStackTrace();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flcontent,myFragment).commit();
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mToggle.setDrawerIndicatorEnabled(false);
mDrawerlayout.closeDrawers();
}
private void setupDrawerContent(NavigationView navigationView){
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectIterDrawer(item);
return true;
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
if (mToggle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}

配置文件.java(片段(

public static Profile newInstance(String param1, String param2) {
Profile fragment = new Profile();
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_profile, 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);
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}

public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}

}

Answer 1

我认为您必须再次回调主活动才能按下后退按钮。

定义一个方法来启动活动，并在onOptionItemSelected((方法中调用它。 喜欢。。

public void onBackPressed(){
Intent  i=new Intent(this,Mainactivity.class)
startActivity(intent);
finish();
} 
public boolean onOptionItemSelected(MenuItem item){
if(item.getItemID()==android.R.id.home){
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}

我不确定，这可能会有所帮助...