I have a MainActivity along with a fragment. I have a refresh menu option that will refresh the data (Using AsyncTask). Is there any difference in inflating the refresh menu option in the fragment than in the MainActivity?
Note: This is in context with Udacity's Developing Android Apps, Lesson 2.
Yes, if i understand right, you want to inflate your activity toolbar menu from the the fragment. If that is the case you can do it like this
Yout Fragment class
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setHasOptionsMenu is important
//it's telling the parent activity that he wants to participate in inflation of the menu
setHasOptionsMenu(true);
}
//Rest of your methods (onCreateView, onPause, onResume etc...)
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
//inflate the menu file
inflater.inflate(R.menu.your_menu_xml, menu);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
switch (item.getItemId()) {
case R.id.refresh:
//handle click
return true;
}
return super.onOptionsItemSelected(item);
}
You can also use setMenuVisibility(boolean) if you want to hide/show menu in certain childfragments
If you inflate the menu from within the activity, it will be shown in all of the fragments you load inside the activity, but the action will be available to activity only (This is good if you want to do some general stuff with your menu action like starting new activity, displaying information popup etc). If you inflate the menu from within the fragment you will be able to handle menu items from withing the fragment, which will allow you to create more specific menu actions based on which fragment is currently active. For example if you have viewpager with 3 different fragments lets say:
FragmentOne for image browsing
FragmentTwo for video browsing
FragmentThre for Text browsing
Lets say you want to allow users to upload the images only, and you want that upload button to be located in the menu.
If you inflate the the menu from within the activity your upload button will be visible inside all of your fragments, and you would have to create a custom/logic for showing hiding menu items. If you create a menu from within the fragment, you will be able to handle and show the menu for the fragment you need
Long story short i think this depends on the use case of the activity/fragment and what you want to achieve with it
Related
I have a navigation drawer and when i click on one button i want to go to other fragment where i can't access to the navigation drawer and anything else. I just want have a black arrow in the top-left to go back and return to the navigation drawer with all the fragments.
I tried somethings but don't works like i want normally navigator continues accessible and see bot layouts one over the other.
MAIN FRAGMENTS CONTROLLER
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
DrawerLayout drawerLayout=findViewById(R.id.drawer);
NavigationView navigationView=findViewById(R.id.nav_view);
setSupportActionBar(toolbar);
appBarConfiguration= new AppBarConfiguration.Builder(R.id.nav_home,
R.id.nav_user_data,R.id.nav_join_group,
R.id.nav_user_groups,R.id.nav_search_documents)
.setDrawerLayout(drawerLayout).build();
navController = Navigation
.findNavController(this,R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);
NavigationUI.setupWithNavController(navigationView,navController);
}
#Override
public boolean onSupportNavigateUp() {
return NavigationUI.navigateUp(navController,appBarConfiguration)
|| super.onSupportNavigateUp();
}
I'm trying with a botton on my ActionBar, when i click it should go to my new fragment (with a generic app back but with one back button)
You simply should specify your action in navigation.xml file like others.
It will change hamburger icon by itself because you synchronize your navigation controller with NavDrawer in this two lines of code:
NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);
NavigationUI.setupWithNavController(navigationView,navController);
We need to add one fragment in our navigation.xml (the file where we define our fragments associated with the Fragment and the layout) for the Fragment where we want to go. Add there an action with a unique id and where we want to go in the fragment where we are.
Sorry, i know it's a little bit confused.
NAVIGATION
We go from there
<fragment
android:id="#+id/nav_user_data"
android:name="com.example.androidapplication_reto2.project.activities.navigationfragments.SeeAndModifyUserDataFragment"
android:label="User Data"
tools:layout="#layout/fragment_see_and_modify_user_data"
>
<action
android:id="#+id/action_nav_user_data_to_nav_modify_data"
app:destination="#+id/nav_modify_data" />
</fragment>`
To there
<fragment
android:id="#+id/nav_modify_data"
android:name="com.example.androidapplication_reto2.project.activities.navigationfragments.ModifyUserDataFragment"
android:label="Modify User Data"
tools:layout="#layout/fragment_modify_user_data"
/>
With the action that we defined in the origen fragment.
ORIGEN FRAGMENT
And in the Fragment when you click on one button just happen this.
Navigation.findNavController(getView()).navigate(R.id.action_nav_user_data_to_nav_modify_data);
Currently in my app i have BottomNavigationView, that consists for example from 3 menu items, that linked with fragments:
Profile Fragment
Reader Fragment
Bookmarks Fragment
Also i have another fragments (Settings, Edit Profile, etc)
So when i navigate to the fragment that doesn't appear in BottomNavigationView menu i want to reset selection of menu item in BottomNavigationView.
In my code i only have NavController and this method
#Override
public void onFragmentNavigation(int id) {
navController.navigate(id);
}
My action bar has this button on the top right :
And when I click it, it gives me a settings menu item which does nothing on click:
I would like to disable the button in the first picture (looks like an ellipsis but rotated) from my ActionBar.
How would I go about doing that?
This is the default overflow menu that is set by the SDK when you create a new Android project.
To disable the menu you just have to remove the code that adds it. You should have a method onCreateOptionsMenu() overridden somewhere in your Activity, which you can remove.
selects a contextual menu item
#Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false; // Return false if nothing is done
}
more info here - http://developer.android.com/guide/topics/ui/menus.html#context-menu
How to get ActionBar onClick listener? I mean- global listener for whole view, not only ActionBar child views
Try to use a custom view.
Create the layout you want for your action bar
Add the android:onClick attribute in the xml
android:onClick="handleClick"
inflate it somewhere in your code
use ActionBar.setCustomView() method
Implement the onClick method in your Java
public void handleClick(View view) {
// code after click here
}
That should work !
I love this site all you guys are awesome! but here is another problem I have:
In my app I have a webview that displays a website in the entire screen, I have made a code to show a menu through pushing the phone's menu button from where i want 2 things to happen 1st menu item Go back to main screen of the app, 2nd menu item quit the app or exit the app.
First problem:
after pressing the menu button it shows the menu... if I press it again it shows the two choices twice, if I press it again now both items shows 3 times and so on!
Second Problem:
after choosing any of the two choices nothing happens!
here is my code please tell me what I'm doing wrong!
Thanks
menu xml:
<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/menuToMenu"
android:title="Menu Principal"
/>
<item
android:id="#+id/menuToSalir"
android:title="Salir"
/>
</menu>
Backtomain.java
import android.app.Activity;
import android.os.Bundle;
public class Backtomain extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
and where I call the menu:
public boolean onPrepareOptionsMenu (Menu menu){
super.onCreateOptionsMenu(menu);
MenuInflater mostrar = getMenuInflater();
mostrar.inflate(R.menu.main_menu, menu);
return true;
}
public boolean onOptionItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.menuToMenu:
startActivity (new Intent("my.app.BACKTOMAIN"));
return true;
case R.id.menuToSalir:
finish();
System.exit(0);
return true;
}
return false;
}
You are calling super.onCreateOptionsMenu() from onPrepareOptionsMenu(). And, you are inflating the same options into the menu in onPrepareOptionsMenu(). Rename onPrepareOptionsMenu() to onCreateOptionsMenu(), and it will probably behave better.
Also:
If you think the my.app.BACKTOMAIN activity is running, you probably want to add FLAG_ACTIVITY_REORDER_TO_FRONT or FLAG_ACTIVITY_CLEAR_TOP to the Intent.
Get rid of the menuToSalir menu choice. No well-written Android application will call System.exit(0). Users leave your application by pressing the HOME button, no different than they might in a Web app.
To fix your first problem try onCreateOptionsMenu(), rather than onPrepareOptionsMenu().
I am not positive how to fix second problem, I usually create my menus all in java instead of using xml like you have.
I found the problem it works! I was missing the "s" at...
public boolean onOptionItemSelected(MenuItem item){
the right way is
public boolean onOptionsItemSelected(MenuItem item){
thanks for your help Tim and CommonsWare
I ran into this problem. In my case I had set the background color of the activity screen to black. When the menu popped up it had a transparent background and black text so I didn't see it working.