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Only able to navigate to the extra layout for the first click

The following code is trivial but simulates the problem.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<Button
android:id="#+id/btnGoToExtra"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="266dp"
android:text="Go To Extra"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
layout_extra.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<Button
android:id="#+id/btnBackToMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="186dp"
android:text="Back To Main"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btnGoToExtra)
.setOnClickListener(v -> {
setContentView(R.layout.layout_extra);
findViewById(R.id.btnBackToMain)
.setOnClickListener(vv -> {
setContentView(R.layout.activity_main);
});
});
}
}
Question
I can navigate to the layout_extra from activity_main and return to activity_main. Unfortunately, after this round trip, I can no longer be able to navigate to layout_extra anymore.
What causes this problem and how to fix it?

Explanation will follow in chat but that is not how it is supposed to be done, For views to change, You have other options like using Fragments or using new activity entirely, I would also like to suggest moving to kotlin.
public class MainActivity extends AppCompatActivity {
View mainView;
View extraView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mainView = getLayoutInflater().inflate(R.layout.activity_main, null);
extraView = getLayoutInflater().inflate(R.layout.layout_extra, null);
setContentView(mainView);
mainView.findViewById(R.id.btnGoToExtra)
.setOnClickListener(v -> {
setContentView(extraView);
});
extraView.findViewById(R.id.btnBackToMain)
.setOnClickListener(vv -> {
setContentView(mainView);
});
}
}

Reading through the snippet above, here's how everything went
The line
findViewById(R.id.btnGoToExtra)
.setOnClickListener
Registers Button with id btnGoToExtra for click events and when that happens you have the nested
findViewById(R.id.btnBackToMain)
.setOnClickListener
Which registers the element with id backToMain for click events and that's all
Calling setContentView() multiple times is not recommended. The normal way to switch between layouts in the same activity is to use a ViewFlipper or FrameLayout
From here
You then have:
XML
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:src="#drawable/icon"
android:scaleType="fitCenter"
android:layout_height="fill_parent"
android:layout_width="fill_parent"/>
<TextView
android:text="Learn-Android.com"
android:textSize="24sp"
android:textColor="#000000"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:gravity="center"/>
</FrameLayout>
code
private void SwitchLayout2() {
RelativeLayout Layout1 = (RelativeLayout)findViewById(R.id.layout1);
RelativeLayout Layout2 = (RelativeLayout)findViewById(R.id.layout2);
// Enable Layout 2 and Disable Layout 1
Layout1 .setVisibility(View.GONE);
Layout2.setVisibility(View.VISIBLE);
}
private void SwitchLayout1() {
RelativeLayout Layout1 = (RelativeLayout)findViewById(R.id.layout1);
RelativeLayout Layout2 = (RelativeLayout)findViewById(R.id.layout2);
// Enable Layout 1 & Disable Layout2
Layout1.setVisibility(View.VISIBLE);
Layout2.setVisibility(View.GONE);
}

Deselect and Normalize default menu item selection

As you can see on the image below, I am having a hard time to figure out on how to deselect the first menu item since it is active by default on the BottomNavigationView.
I already tried everything but still the first menu is still raised.
Java Code.
public class MainActivity extends AppCompatActivity {
private BottomNavigationView bottomNavigationView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottomNavigation);
bottomNavigationView.setBackground(null);
bottomNavigationView.getMenu().setGroupCheckable(0, false, true);
bottomNavigationView.setElevation(0);
//bottomNavigationView.setSelectedItemId(R.id.menu2);
}
}
Main XML
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/main_bottom_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:fabCradleMargin="10dp"
app:fabCradleRoundedCornerRadius="10dp"
app:fabCradleVerticalOffset="10dp">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginEnd="16dp"
android:background="#android:color/transparent"
app:menu="#menu/main_bottom_menu"
/>
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
app:backgroundTint="#color/_Surface"
app:tint="#color/_OnSurface"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/dashboard_24"
app:layout_anchor="#+id/main_bottom_appbar"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
If you have any ideas on how to normalize the menu items on the BottomNavigationView, I will really appreciate the help.
Thanks.

Try to add this in your bottomNavigationView in main.xml
app:labelVisibilityMode="unlabeled"
So your view will be like this:
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginEnd="16dp"
android:background="#android:color/transparent"
app:menu="#menu/main_bottom_menu"
app:labelVisibilityMode="unlabeled"
/>
You can see more details about what changes you are allowed to make on view here:
https://material.io/components/bottom-navigation/android#using-bottom-navigation

public static void setCheckable(BottomNavigationView view, boolean checkable) {
final Menu menu = view.getMenu();
for(int i = 0; i < menu.size(); i++) { // Your Menu 0
menu.getItem(i).setCheckable(checkable);
}
}
Since the related menu is 0, you can arrange the code according to 0.

How do I inflate dialog at the bottom of my layout?

My swipe to dismiss dialog is currently showing at the center of my layout which matches the parent's width. No left/right margins. I want to place it on the bottom.
This is my XML layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_fmcg_popup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_gravity="bottom"
android:layout_weight="1"
android:background="#drawable/button_border">
<android.support.constraint.ConstraintLayout
android:id="#+id/main_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="17dp"
android:layout_marginTop="13dp"
android:layout_marginEnd="17dp"
android:layout_marginBottom="13dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
// other code goes here
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
This is the code for swipe to dismiss dialog. I am currently using a swipe to dismiss dialog library.
View dialog = LayoutInflater.from(this).inflate(R.layout.dialog_fmcg_popup, null);
TextView tvfmcg2 = dialog.findViewById(R.id.tv_fmcg2);
tvfmcg2.setText(message);
swipeDismissDialog = new SwipeDismissDialog.Builder(this)
.setView(dialog)
.setOnSwipeDismissListener(new OnSwipeDismissListener() {
#Override
public void onSwipeDismiss(View view, SwipeDismissDirection direction) {
Preferences.setString(Prefkey.last_qualified_fmcg_voucher_on_remove, message);
}
})
.setFlingVelocity(0)
.setOverlayColor(0)
.build()
.show();
}

You can try below code this will show the dialog at the bottom of the screen:
Dialog dialog
//code to initialize dialog here
Window window = dlg.getWindow();
WindowManager.LayoutParams wlp = window.getAttributes();
wlp.gravity = Gravity.BOTTOM;
wlp.flags = WindowManager.LayoutParams.FLAG_DIM_BEHIND;
window.setAttributes(wlp);

Center App Bar title on Android

I'm trying to create my own custom app bar with a center-aligned title. Android Studio's editor shows my title is properly centered, but it is not on my actual device.
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar myToolbar = (Toolbar) findViewById(R.id.encounter_toolbar);
setSupportActionBar(myToolbar);
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView(R.layout.encounter_menu_bar_layout);
}
encounter_menu_bar_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<TextView
android:id="#+id/encounter_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/untitled"
android:textSize="20sp"
android:textColor="#color/titleTextColor"
android:textStyle="bold"
android:layout_gravity="center" />
</LinearLayout>
encounter_menu_bar.xml doesn't have anything in it:
<?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">
</menu>
EDIT
A lot of you are recommending that I change android:layout_gravity to android:gravity. I've tried that as well and I'm still not getting it to line up properly.
I'm enabling the app bar to show up on a specific fragment, as shown here:
EncounterFragment.java
public class EncounterFragment extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
return inflater.inflate(R.layout.fragment_encounter, container, false);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
menuInflater.inflate(R.menu.encounter_menu_bar, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO: This
return super.onOptionsItemSelected(item);
}
}
I also forgot to mention that I'm attaching the menu in a fragment. This is its layout:
fragment_encounter.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/encounter_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
</LinearLayout>

Try adding android:gravity="center".
This happens because you have to center the whole text and not just the layout

Use android:layout_gravity="center"
Example:
<LinearLayout 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"
android:orientation="vertical">
<Button
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
NOTE: layout_gravity, not gravity
In your case:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<TextView
android:id="#+id/encounter_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/untitled"
android:textSize="20sp"
android:textColor="#color/titleTextColor"
android:textStyle="bold"
android:layout_gravity="center" />
</LinearLayout>

Change the textview to this
make it match parent for width, And make gravity center to center the text
<TextView
android:id="#+id/encounter_name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="#string/untitled"
android:textSize="20sp"
android:textColor="#color/titleTextColor"
android:textStyle="bold"
android:gravity="center" />

You want to change your xml view to this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
#this should be horizontal, not vertical.
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<TextView
android:id="#+id/encounter_name"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/untitled"
android:textSize="20sp"
android:textColor="#color/titleTextColor"
android:textStyle="bold"
/>
To start, you need to make your linear layout horizontal, not vertical. By making it vertical, you are aligning it to the left.
Then, you need to make sure that your textview width and height match the parent, rather than just wrap the content. Then you can use the gravity attribute to make sure that the text is centered. When you used gravity before, the textview simply wrapped the content, and thus it didn't center in the textview. By matching the parent view bounds, you will be able to then center the text as you need to.

This is how your Toolbar XML should be
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:minHeight="?attr/actionBarSize"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:titleTextColor="#android:color/white"
android:background="?attr/colorPrimary">
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Toolbar Title"
android:textColor="#android:color/white"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_gravity="center"
/>
</android.support.v7.widget.Toolbar>
Then in your Activity
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);

Using GridView and LinearLayout , Gridview is expressed in the top on display

I am designing layout as follows.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
<ScrollView
<LinearLayout
<LinearLayout
<TextViewなど
.
.
.
</LinearLayout>
<LinearLayout
<packagename.ExpandableHeightGridView
</LinearLayout>
</LinearLayout>
</ScrollView>
I was executing the program on the nexus5.
It is as follows, Gridview is expressed in the top on display.
enter image description here
If I scroll to the top, then LinearLayout is expressed.
enter image description here
I tried to adjust the layout.
But GridView wasn't adjusted.
I want to set LinearLayout to the top at first.
public class Activity_CommunicationSpace_MemberList extends Activity {
private List<Data_User> objects = new ArrayList<Data_User>();
private Data_User item = new Data_User();
private String user_name;
private Bitmap user_icon;
private Bitmap user_profile;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_communicationspace_memberlist);
user_name = "Test_Test";
user_icon = BitmapFactory.decodeResource(getResources(), R.drawable.icon_lamborghini);
for (int i = 0; i < 60; i++) {
item = new Data_User();
item.setNameData(user_name);
item.setIconData(user_icon);
objects.add(item);
}
Adapter_CommunicationSpace_MemberList adapter = new Adapter_CommunicationSpace_MemberList(getApplicationContext(), R.layout.adapter_communicationspace_memberlist, objects);
ExpandableHeightGridView expandableHeightGridView = (ExpandableHeightGridView) findViewById(R.id.gridview_communicationspace_memberlist);
expandableHeightGridView.setExpanded(true);
expandableHeightGridView.setAdapter(adapter);
final ScrollView scrollView = (ScrollView) findViewById(R.id.activity_communicationspace_memberlist_scrollView);
scrollView.post(new Runnable() {
public void run() {
scrollView.fullScroll(ScrollView.FOCUS_UP);
}
});
}

If Listview And Gridview Are in Bottom Then its Scroll itself. they Does'nt need Scrollview or ExpendeableGridview in This Case
U Should Try This Layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Country Codes"
android:textSize="20sp" />
<Button
android:id="#+id/findSelected"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Get Selected Items" />
<GridView
android:id="#+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"/></LinearLayout>