Develop Reference

Hide menu item conditionally in Toolbar using DialogFragment

I'm doing a mobile application in Android with JAVA using a DialogFragment with Toolbar.
I want to hide a menu item conditionally.
Menu
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/action_favorite"
android:title="favorite"
android:icon="#drawable/ic_favorite_white_off_24dp"
app:showAsAction="always" />
<item
android:id="#+id/action_delete"
android:title="delete"
android:icon="#drawable/ic_delete_white_24dp"
app:showAsAction="always" />
<item
android:id="#+id/action_save"
android:title="save"
app:showAsAction="always" />
</menu>
Layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:paddingStart="6dp"
android:paddingEnd="16dp"
app:contentInsetStartWithNavigation="0dp"
app:navigationIcon="#drawable/ic_close_black_24dp" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<!-- EditText's and buttons ..... -->
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
DialogFragment
public class MyDialogFragment extends DialogFragment implements Toolbar.OnClickListener, Toolbar.OnMenuItemClickListener {
public static final String TAG = "my_dialog";
private Toolbar toolbar;
public static MyDialogFragment display(FragmentManager fragmentManager) {
NewPersonDialogFragment exampleDialog = new NewPersonDialogFragment();
exampleDialog.show(fragmentManager, TAG);
return exampleDialog;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(NewPersonDialogFragment.STYLE_NORMAL, R.style.AppTheme_FullScreenDialog);
}
#Override
public void onStart() {
super.onStart();
Dialog dialog = getDialog();
if (dialog != null) {
int width = ViewGroup.LayoutParams.MATCH_PARENT;
int height = ViewGroup.LayoutParams.MATCH_PARENT;
dialog.getWindow().setLayout(width, height);
dialog.getWindow().setWindowAnimations(R.style.AppTheme_Slide);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.dialog_fragment_new_person, container, false);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
toolbar = view.findViewById(R.id.toolbar);
toolbar.inflateMenu(R.menu.new_person_dialog_menu);
toolbar.setNavigationOnClickListener(this);
toolbar.setOnMenuItemClickListener(this);
toolbar.setTitle("Add new");
}
#Override
public void onClick(View v) {
// This is working fine
}
#Override
public boolean onMenuItemClick(MenuItem item) {
// This is working fine
switch (item.getItemId()) {
case R.id.action_favorite:
return true;
case R.id.action_delete:
return true;
case R.id.action_save:
return true;
default:
return false;
}
}
#Override
public void onCreateOptionsMenu(#NonNull Menu menu, #NonNull MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
// Removing item doesn't work!
menu.removeItem(R.id.action_delete);
}
}
I open the DialogFragment like this:
MyDialogFragment.display(getActivity().getSupportFragmentManager());
When I open the DialogFragment, the menu item is not hidden.
As other topics says, I have tried:
setHasOptionsMenu(true) in onActivityCreated method.
getActivity().invalidateOptionsMenu() in onPrepareOptionsMenu method.
My goal is to hide/remove a menu item based on a condition when the user opens the DialogFragment.

findViewById fails in onViewCreated of a PreferenceFragment, Android

I have two fragments :
- HomeFragment that extends Fragment
- SettingsFragment that extends PreferenceFragment
Each one contains a TextView that I wish to access and modify its content in the Java code. I make this modification inside the onViewCreated by calling findViewById and then, using setText on the TextView.
This works fine for HomeFragment, but it does not in SettingsFragment.
For information, the TextView of SettingsFragment is defined in the layout associated to the Preference. Strangely, it seems that the views hierarchy of PreferenceFragment type is not fully ready in the onViewCreated ! To go further, I tried to put the code that modifies the TextView after some delay (using postDelay), and that worked !
Below, I put all the code necessary to test the issue I have just raised.
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final HomeFragment homeFragment = new HomeFragment();
final SettingsFragment settingsFragment = new SettingsFragment();
getFragmentManager().beginTransaction()
.add(R.id.fragmentContainer, homeFragment).commit();
// Just a simple button to switch between the two fragments
Button button = findViewById(R.id.activityButton);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(homeFragment.isAdded()) {
getFragmentManager().beginTransaction()
.replace(R.id.fragmentContainer, settingsFragment).commit();
} else {
getFragmentManager().beginTransaction()
.replace(R.id.fragmentContainer, homeFragment).commit();
}
}
});
}
}
HomeFragment.java
public class HomeFragment extends Fragment {
public HomeFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_home, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
TextView textView = view.findViewById(R.id.homeText);
if(textView != null) {
textView.setText("Home fragment text (modified)");
}
}
}
SettingsFragment.java
public class SettingsFragment extends PreferenceFragment {
public SettingsFragment() {
// Required empty public constructor
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.fragment_settings);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onViewCreated(final View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// ---- BLOCK 1 -----
TextView textView = view.findViewById(R.id.settingsText);
if (textView != null) {
textView.setText("Preference 1 (modified)");
}
// ---- BLOCK 2 -----
// view.post(new Runnable() {
// #Override
// public void run() {
// TextView textView = view.findViewById(R.id.settingsText);
// if (textView != null) {
// textView.setText("Preference 1 (modified)");
// }
// }
// });
// ---- BLOCK 3 -----
// view.postDelayed(new Runnable() {
// #Override
// public void run() {
// TextView textView = view.findViewById(R.id.settingsText);
// if (textView != null) {
// textView.setText("Preference 1 (modified)");
// }
// }
// }, 100);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="#+id/activityText"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:gravity="center_horizontal"
android:text="MainActivity" />
<Button
android:id="#+id/activityButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/activityText"
android:text="Change fragment"/>
<FrameLayout
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#id/activityButton"
app:layout_constraintBottom_toBottomOf="parent">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<TextView
android:id="#+id/homeText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:text="Home fragment text" />
</android.support.constraint.ConstraintLayout>
fragment_settings.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:layout="#layout/preference_layout_category">
<Preference
android:enabled="true"
android:layout="#layout/preference_layout" />
</PreferenceCategory>
</PreferenceScreen>
preference_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<TextView
android:id="#+id/settingsText"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:textAllCaps="true"
android:text="Preference 1"/>
</android.support.constraint.ConstraintLayout>
preference_layout_category.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<TextView
android:id="#+id/settingsTextContainer"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:textAllCaps="true"
android:background="#android:color/background_dark"
android:textColor="#android:color/background_light"
android:text="Category 1"/>
</android.support.constraint.ConstraintLayout>

I had something similar the other day.
Use findViewById() in the on onCreateView of the fragment instead of the onViewCreated method.
Good luck.

Bind your views in onCreateView() instead like this
View view= inflater.inflate(R.layout.your_fragment, container, false);
TextView textView = view.findViewById(R.id.settingsText);
return view;

fragment to fragment android call

I want open fragment when I click listitem (fragment) but failed, no error logcat.
fragment_item_two.xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="layout.ItemTwoFragment"
xmlns:app="http://schemas.android.com/apk/res-auto">
<!-- TODO: Update blank fragment layout -->
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</FrameLayout>
fragment1 (listview): (ItemTwoFragment.java)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_item_two, container, false);
BottomNavigationView bottomNavigationView = (BottomNavigationView)
view.findViewById(R.id.navigation);
contactList = new ArrayList<>();
lv = (ListView) view.findViewById(R.id.list);
new GetContacts().execute();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> pa, View v, int p, long id) {
int itm = (int) pa.getItemAtPosition(p);
fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragmentContainer, new NewsFragment());
transaction.commit();
}
});
return view;
}
NewsFragment:
public class NewsFragment extends Fragment {
}
fragment_news:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="layout.NewsFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="news fragment" />
</FrameLayout>
how to fix this problem? or can you give me the reference for this case? thanks

you forget to inflate your fragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_news, container, false);
// Your code ....
return rootView;
}

ListView appears under the clicked button

I have the following implementation which runs with no hassle. When user clicks on a button then list view shows. However, list view shows up in the middle of screen. I want it to show up just beneath of the clicked button. Here is my implementation:
MainActivity
namespace DialogExample
{
[Activity (Label = "DialogExample", MainLauncher = true, Icon = "#drawable/icon")]
public class MainActivity : Activity
{
private Button mClickBtn;
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.Main);
mClickBtn = FindViewById<Button> (Resource.Id.myButton);
mClickBtn.Click += MClickBtn_Click;
}
void MClickBtn_Click (object sender, EventArgs e)
{
FragmentTransaction transaction = FragmentManager.BeginTransaction ();
Dialog_Form dialogList = new Dialog_Form ();
dialogList.Show (transaction, "Dialog fragment");
}
}
}
Diaolog_Form
namespace DialogExample
{
public class Dialog_Form:DialogFragment
{
private ListView myListView;
private List<string> myList=new List<string> ();
public Dialog_Form ()
{
}
public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
base.OnCreateView (inflater, container, savedInstanceState);
myList.Add ("Jason");
myList.Add ("Kenny");
myList.Add ("Tedd");
var view = inflater.Inflate (Resource.Layout.dialog_form, container, false);
myListView = view.FindViewById<ListView> (Resource.Id.myListView);
ArrayAdapter adapter = new ArrayAdapter (Activity, Android.Resource.Layout.SimpleListItem1, myList);
myListView.Adapter = adapter;
return view;
}
public override void OnActivityCreated (Bundle savedInstanceState)
{
Dialog.Window.RequestFeature (WindowFeatures.NoTitle);
base.OnActivityCreated (savedInstanceState);
}
}
}
Main.axml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="#+id/myButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Click Here" />
</LinearLayout>
dialog_form.axml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:minWidth="25px"
android:minHeight="25px">
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/myListView" />
<Button
android:text="Project Download"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/downloadButton" />
</LinearLayout>

This should work:
public class Dialog_Form:DialogFragment
{
private ListView myListView;
private List<string> myList=new List<string> ();
public Dialog_Form ()
{
}
public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
base.OnCreateView (inflater, container, savedInstanceState);
myList.Add ("Jason");
myList.Add ("Kenny");
myList.Add ("Tedd");
var view = inflater.Inflate (Resource.Layout.dialog_form, container, false);
myListView = view.FindViewById<ListView> (Resource.Id.myListView);
ArrayAdapter adapter = new ArrayAdapter (Activity, Android.Resource.Layout.SimpleListItem1, myList);
myListView.Adapter = adapter;
// Dialog.Window.SetGravity (GravityFlags.CenterHorizontal | GravityFlags.Top);
var layoutParam = Dialog.Window.Attributes;
layoutParam.Width = ViewGroup.LayoutParams.MatchParent;
layoutParam.X = 80;
layoutParam.Y = 200;
Dialog.Window.Attributes = layoutParam;
return view;
}
public override void OnActivityCreated (Bundle savedInstanceState)
{
Dialog.Window.RequestFeature (WindowFeatures.NoTitle);
base.OnActivityCreated (savedInstanceState);
}
}
Specify the x & y position by setting them in the oncreateview. The x & y position should be calculated by the x & y position from your button + the height & width so it will show it above the button.

achartengine: How to add chart to fragment in Tabs

I want to show a Button and a PieChart below in a tab.
Thats the code I worked with: https://github.com/JakeWharton/ActionBarSherlock/blob/master/samples/fragments/src/com/actionbarsherlock/sample/fragments/FragmentTabs.java
Instead of the CountingFragment etc. I implemented my own.
I'm not sure what to
My xml:
fragment_graph_categories.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_graph_categories"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/button_filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_filter" />
</LinearLayout>
And that's my "Tab" attached to the TabManger
public class GraphCategories extends SherlockFragmentActivity {
GraphCategoriesFragment mCategoriesFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_graph_categories);
if (savedInstanceState == null) {
// Do first time initialization -- add initial fragment.
mCategoriesFragment = GraphCategoriesFragment.newInstance(1);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.fragment_graph_categories, mCategoriesFragment).commit();
} else {
//mStackLevel = savedInstanceState.getInt("level");
}
}
#Override
protected void onResume() {
if(mCategoriesFragment != null) {
//mCategoriesFragment.onResumeRedraw();
}
}
//notice Inner class
public static class GraphCategoriesFragment extends SherlockFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//View mChartView = inflater.inflate(R.layout.hello_world, container, false);
View rlayout = inflater.inflate(R.layout.fragment_graph_categories, container, false);
//? rlayout = new LinearLayout(getActivity());
return rlayout;
}
}
}
But im not sure what to inflate at the fragments onCreateView or if I need a FrameLayout in my xml?
I tried some options but don't figured it out.