我有一个导航抽屉活动(主管控制台),其中有一个包含recyclerview的片段(工人详细信息)。
在同一活动中,我有一个底部的片段,其中显示了排序选项。
现在,我想将用户选择的那些排序选项应用于RecyclerView。
Activity -> Fragment1 (worker details) -> RecyclerView
-> RecyclerViewAdapter
-> RecyclerViewModel
-> Fragment2 (bottom sheet) -> Sort options
因此,如何访问Fragment1的RecyclerView对象并通过Fragment2中的onClick对适配器的数组进行排序
现在,我已经可以使用
从片段中调用主机活动方法(SupervisorDashboard)getActivity()).method()
但是如何从主机活动中访问Fragment1的RecyclerView对象?
工作人员详细信息
public class WorkerDetailsFragment extends Fragment {
private WorkerDetailsViewModel workerDetailsViewModel;
static RecyclerView recyclerView;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
workerDetailsViewModel = ViewModelProviders.of(this).get(WorkerDetailsViewModel.class);
View root = inflater.inflate(R.layout.fragment_worker_details, container, false);
recyclerView = root.findViewById(R.id.rc_worker_details);
WorkerRVAdapter workerRVAdapter = new WorkerRVAdapter(
workerDetailsViewModel.getWorkerNames(),
workerDetailsViewModel.getWorkerRoles(),
workerDetailsViewModel.getImageUrls(),
getContext());
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setAdapter(workerRVAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
return root;
}
}
SupervisorDashboard
public class SupervisorDashboard extends AppCompatActivity {
private AppBarConfiguration mAppBarConfiguration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_supervisor_dashboard);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow,
R.id.nav_tools, R.id.nav_share, R.id.nav_send)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.supervisor_dashboard, menu);
return true;
}
@Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
return NavigationUI.navigateUp(navController, mAppBarConfiguration)
|| super.onSupportNavigateUp();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
View view = getLayoutInflater().inflate(R.layout.fragment_bottom_sheet_sort, null);
// BottomSheetDialog dialog = new BottomSheetDialog(this);
// dialog.setContentView(view);
// dialog.show();
BottomSheetSortFragment bottomSheetFragment = new BottomSheetSortFragment();
bottomSheetFragment.show(getSupportFragmentManager(), "hello");
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
BottomSheetSortFragment
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_bottom_sheet_sort, container, false);
button = view.findViewById(R.id.apply_button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Sort the arrays in RecyclerView on click
dismiss();
}
});
return view;
}
我可以在Fragment2中创建一个静态方法,然后从Fragment1中调用该方法,但是必须有一些正确的方法。
答案 0 :(得分:1)
样本片段
public class SomeFragment extends Fragment {
public View view;
public TextView textView;
public Button button;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view =inflater.inflate(R.layout.fragment_blank, container, false);
textView = (TextView)view.getRootView().findViewById(R.id.textView_fragment1);
return view;
}
public void getTextView(){
return textView;
}
public void getButton(){
return button;
}
一旦在MainActivity或您要访问自己的任何其他位置完成 片段中的TextView / Button应该确保在其中设置片段 您的OnCreate()方法以其他方式将很可能引发nullPointer。 因此,您要更改TextView / Button的活动应如下所示:
public class MainActivity extends AppCompatActivity {
private Button button1;
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
SomeFragment someFragment = new SomeFragment();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button)findViewById(R.id.button1);
changeFragment();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment1,someFragment);
fragmentTransaction.commit();
// Now we can get access to TextView and Button inside SomeFragment
}
public void updateText(String msg) {
TextView v = this.someFragment.getTextView();
v.setText(msg);
}
} // end of activity
答案 1 :(得分:0)
但是如何从主机活动中访问Fragment1的RecyclerView对象?
理想情况下,您不会。您在Fragment1中公开了一个方法,该方法定义了您要执行的操作,然后根据需要在Activity中调用它。
文档涵盖了片段之间的通信方式:
https://developer.android.com/training/basics/fragments/communicating