Inflating a fragment in main activity brings an error

Inflating a fragment in main activity brings an error - java

I want to be able to swap between two fragments in my main activity class. But when inflating the fragment my application crashes. Below is my code:
This is the XML code where my fragment will be placed
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="wrap_content"
android:background="#drawable/rounded_dialog"
android:orientation="vertical"
app:behavior_hideable="false"
app:behavior_peekHeight="56dp"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
<fragment
android:id="#+id/fragment_place"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"/>
</LinearLayout>
This is the code for my Fragment
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.user.swim.AsyncTasks.GeoCodingTask;
public class SearchLocation extends Fragment {
private EditText destination;
private Button search;
private RecyclerView recyclerView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_search_locatiom, null);
search = view.findViewById(R.id.search_destination);
destination = view.findViewById(R.id.destination);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
searchLocation(view);
return view;
}
Below is the code in my main activity to inflate the layout
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(findViewById(R.id.fragment_place)!=null){
if (savedInstanceState != null) {
return;
}
SearchLocation fragment = new SearchLocation();
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_place, fragment).commit();
}
I get the following errors in my logcat:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.swim, PID: 20462
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.swim/com.example.user.swim.MainActivity}: android.view.InflateException: Binary XML file line #29: Binary XML file line #14: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: android.view.InflateException: Binary XML file line #29: Binary XML file line #14: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class fragment
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.Fragment.instantiate(Fragment.java:617)
at android.app.FragmentContainer.instantiate(FragmentContainer.java:49)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3598)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:6182)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:338)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:783)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:827)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:995)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:862)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:827)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.example.user.swim.MainActivity.onCreate(MainActivity.java:87)
at android.app.Activity.performCreate(Activity.java:6980)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
This is the XML for fragment_search_locatiom
<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textStyle="bold"
android:layout_margin="10dp"
android:text="#string/where_would_you_like_to_go"
android:textAlignment="center" />
<EditText
android:id="#+id/destination"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:padding="10dp"
android:drawablePadding="5dp"
android:drawableStart="#drawable/ic_search_black_24dp"
android:drawableLeft="#drawable/ic_search_black_24dp"
android:textSize="18sp"
android:inputType="text"
android:background="#drawable/rectangle"
android:hint="Search for destination"
android:maxLines="1"
android:imeOptions="actionDone"
android:textAlignment="textStart" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/search_destination"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/search_destination" />
</LinearLayout>
I don't want to add the name/class attribute in the XML for the fragment because when you look at the official documentation adding those attributes won't make it possible to change fragments at runtime.
Also i've tried changing the MainActivity class to extend ActivityFragment but after more research i've discovered that ActivityFragment is a subclass of AppCompatActivity.

i have copied your code and try to use it,when i use fragment in the SearchLocation it makes error so i changed it to Framlayout.
Can't realy tell what is wrong in your code but this worked after i made changes
MainActivity
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (findViewById(R.id.fragment_place) != null) {
if (savedInstanceState != null) {
return;
}
SearchLocation fragment = new SearchLocation();
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_place, fragment).commit();
}
}
SearchLocation java
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class SearchLocation extends Fragment {
private EditText mSearch;
private Button mDestination;
private RecyclerView mRecyclerView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_search_location, null);
mSearch = view.findViewById(R.id.search_destination);
mDestination = view.findViewById(R.id.destination);
mSearch.setText("Hello world");
RecyclerView mRecyclerView = view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
/*searchLocation(view);*/
return view;
}
search_location 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=".SearchLocation">
<EditText
android:id="#+id/search_destination"
android:layout_width="match_parent"
android:layout_height="0dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/destination"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_marginTop="16dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/search_destination" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="32dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/destination" />
</androidx.constraintlayout.widget.ConstraintLayout>

You can try with Framelayout instead of fragment like the following
<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="#+id/fragment_place"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF" />

Related

Working on Android Music Player Project, and ran into the issue where my app crashes on start up:

I am trying to add a player using Sliding Up Panel but the app crashes on startup. If you want to see my full code;
https://github.com/Kailash8460/poptune.git
MainActivity.java
package com.example.poptunemusicplayerapplication;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import com.example.poptunemusicplayerapplication.fragments.MainFragment;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;
public class MainActivity extends AppCompatActivity {
private static final int KEY_PER = 123;
private SlidingUpPanelLayout panelLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) !=
PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this, new String[]
{Manifest.permission.READ_EXTERNAL_STORAGE}, KEY_PER);
return;
}
else {
UiInitialize();
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
switch (requestCode){
case KEY_PER:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
UiInitialize();
}
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void UiInitialize() {
ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(this));
panelLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
Fragment fragment = new MainFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment);
transaction.commit();
/*List<Song> songList = new SongLoader().getAllSongs(this);
for (Song song : songList){
Log.i("DATA","Title:" + song.title);
}*/
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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:id="#+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="#+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
MainFragment.java
Here there is no issue on SongsFragment, ArtistFragment and AlbumFragment files, because I have run this application before adding the sliding up panel and that was successfully run but after adding this Sliding Up Panel application crashes on startup.
package com.example.poptunemusicplayerapplication.fragments;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.poptunemusicplayerapplication.R;
import com.google.android.material.tabs.TabLayout;
import java.util.ArrayList;
import java.util.List;
public class MainFragment extends Fragment {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public MainFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);
setUpViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
return rootView;
}
private void setUpViewPager(ViewPager viewPager) {
FragmentAdapter adapter = new FragmentAdapter(getActivity().getSupportFragmentManager());
adapter.AddFragments(new SongsFragment(), "Songs");
adapter.AddFragments(new ArtistFragment(), "Artist");
adapter.AddFragments(new AlbumFragment(), "Album");
viewPager.setAdapter(adapter);
}
private class FragmentAdapter extends FragmentPagerAdapter {
private List<Fragment> fragmentList = new ArrayList<>();
private List<String> titleList = new ArrayList<>();
public FragmentAdapter(#NonNull FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
#Override
public int getCount() {
return fragmentList.size();
}
public void AddFragments(Fragment fragment, String title) {
fragmentList.add(fragment);
titleList.add(title);
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return titleList.get(position);
}
}
}
fragment_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:id="#+id/fragmentmainlist"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.MainFragment">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/appbar"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="#+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
android:background="?attr/colorPrimary"
app:popupTheme="#style/Theme.AppCompat.Light"/>
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tabs"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/view_pager"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Errors
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.poptunemusicplayerapplication, PID: 28426
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poptunemusicplayerapplication/com.example.poptunemusicplayerapplication.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: java.lang.IllegalArgumentException: gravity must be set to either top or bottom
at com.sothree.slidinguppanel.SlidingUpPanelLayout.setGravity(SlidingUpPanelLayout.java:366)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:288)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:270)
at java.lang.reflect.Constructor.newInstance0(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:334) 
at android.view.LayoutInflater.createView(LayoutInflater.java:647) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706) 
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195) 
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39) 
at android.app.Activity.performCreate(Activity.java:7258) 
at android.app.Activity.performCreate(Activity.java:7249) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:7025) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
getting error at MainActivity.java:39
Line 39 of MainActivity.java:-
setContentView(R.layout.activity_main);

After looking at the layout in the demo app for SlidingUpPanelLayout, I see it is expecting the android:gravity attribute to be set, not android:layout_gravity.
Try this instead for your layout:
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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:id="#+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="#+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>

App crashes when I switch to an activity that contains a fragment (Binary XML file line #10: Binary XML file line #10: Error inflating class fragment)

My app crashes when I press a button to open another activity that contains a fragment. I am new to Android Studio and I can't seem to find any solution.
In the activity_main.xml I removed the other buttons for this question because I want to focus mainly on this monday_btn.
I researched this type of error and tried many tips but none of them seemed to work.
MainActivity.java
package com.example.dietmanagement;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*Intent i = getIntent();
String current_user = i.getStringExtra("current_user");
TextView current_user_txtview = findViewById(R.id.current_user);
current_user_txtview.setText("Welcome, " + current_user);*/
Button monday = findViewById(R.id.monday_btn);
monday.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent day = new Intent(MainActivity.this, DayActivity.class);
startActivity(day);
}
});
}
}
DayActivity.java
package com.example.dietmanagement;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
public class DayActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_day);
FragmentTransaction fragmentTransaction;
fragmentTransaction = getSupportFragmentManager().beginTransaction();
DayFragment dayFragment = new DayFragment();
fragmentTransaction.add(R.id.dayfragment, dayFragment);
fragmentTransaction.commit();
}
}
DayFragment.java
package com.example.dietmanagement;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class DayFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_day, container, false);
return view;
}
}
fragment_day.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:background="#color/background_green"
tools:context=".DayFragment">
<TextView
android:id="#+id/day"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="#string/day" />
</FrameLayout>
activity_day.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"
android:background="#color/background_green"
tools:context=".DayActivity">
<fragment
android:id="#+id/dayfragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</fragment>
</androidx.constraintlayout.widget.ConstraintLayout>
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"
android:background="#color/background_green"
tools:context=".MainActivity">
<Button
android:id="#+id/monday_btn"
android:layout_width="140dp"
android:layout_height="86dp"
android:text="#string/monday"
android:textColor="#6FED84"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.091"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/main_title"
app:layout_constraintVertical_bias="0.082" />
</androidx.constraintlayout.widget.ConstraintLayout>
This is the error message I get:
2021-03-21 23:34:35.459 29479-29479/com.example.dietmanagement E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dietmanagement, PID: 29479
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dietmanagement/com.example.dietmanagement.DayActivity}: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.Fragment.instantiate(Fragment.java:617)
at android.app.FragmentContainer.instantiate(FragmentContainer.java:49)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3602)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:6187)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:338)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at com.example.dietmanagement.DayActivity.onCreate(DayActivity.java:16)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

You're attempting to load a fragment in two different ways - directly via the layout with the <fragment> tag, which requires you to specify which Fragment you actually want to load, and as a transaction in the activity which requires a layout in which to put the fragment.
// This says - "hey Android load up a fragment for me", but you don't say which
<fragment
android:id="#+id/dayfragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</fragment>
But ...
// This says - "hey Android, shove the new "dayFragment" into the view R.id.dayFragment".
// But based on your previous XML declaration, R.id.dayFragment is itself already a
// Fragment!
FragmentTransaction fragmentTransaction;
fragmentTransaction = getSupportFragmentManager().beginTransaction();
DayFragment dayFragment = new DayFragment();
fragmentTransaction.add(R.id.dayfragment, dayFragment);
fragmentTransaction.commit();
The easiest solution for you, based on what you've posted is to replace the <fragment> element with a FragmentContainerView and either leave the code in your activity or declare the class in the xml. Please see the documentation for examples on how to do this in both ways.

Your <fragment> element does not say what fragment it is supposed to be loading. You need to add an android:name to <fragment>, where the value of android:name is the fully-qualified class name of the fragment:
<fragment
android:id="#+id/dayfragment"
android:name="com.example.dietmanagement.DayActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</fragment>

android.view.InflateException when switching to landscape mode

I am trying to make an app that involves two content mains, one being for portrait the other being for landscape, However, when I switch the orientation to landscape, the app crashes. Portrait and Landscape have different layouts, the only notable difference between the two is that landscape has one more fragment within its layout.
I want to iterate that this is my first time working with landscape mode in android studio so if I made any rookie mistakes, i'm sure you'll be forgiving.
Any input is appreciated, thanks in advance!
Settings Fragment.java
package com.example.celebquizapp;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.content.SharedPreferences;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
public class SettingsFragment extends Fragment implements View.OnClickListener {
private SharedPreferences preferences;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View fragment_view = inflater.inflate(R.layout.fragment_settings, container, false);
preferences = this.getActivity().getSharedPreferences("values", Context.MODE_PRIVATE);
return fragment_view;
}
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
RadioGroup selectionOption = getActivity().findViewById(R.id.selection_option_setting);
setRadioButtonListener(selectionOption);
}
public void onClick(View v) {
RadioButton button = (RadioButton) v;
boolean checked = button.isChecked();
if (checked) {
int chosenVal = Integer.parseInt(String.valueOf(button.getText()));
Log.d("RADIOS", "Current value chosen: " + chosenVal);
preferences.edit().putInt("numofopt", chosenVal).apply();
}
}
public void setRadioButtonListener(RadioGroup radioGroup) {
for (int i = 0; i < radioGroup.getChildCount(); i++) {
radioGroup.getChildAt(i).setOnClickListener(this);
}
}
#Override
public void onStart() {
super.onStart();
// Not required to save data in preferences
// So delete on start up
preferences.edit().clear().apply();
}
}
Settings Fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".SettingsFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/selectionOptionLabel"
android:textColor="#color/colorBlack"
android:textSize="20sp"
android:layout_marginTop="0dp"
android:padding="10dp"/>
<RadioGroup
android:id="#+id/selection_option_setting"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:textSize="20sp"
android:text="#string/_2"
android:layout_marginLeft="10dp" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:textSize="20sp"
android:text="#string/_3"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:textSize="20sp"
android:text="#string/_4"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:textSize="20sp"
android:text="#string/_5"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:textSize="20sp"
android:text="#string/_6"/>
</RadioGroup>
</LinearLayout>
Error message
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.celebquizapp, PID: 11657
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.celebquizapp/com.example.celebquizapp.MainActivity}: android.view.InflateException: Binary XML file line #22 in com.example.celebquizapp:layout/activity_main: Binary XML file line #26 in com.example.celebquizapp:layout/content_main: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.view.InflateException: Binary XML file line #22 in com.example.celebquizapp:layout/activity_main: Binary XML file line #26 in com.example.celebquizapp:layout/content_main: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #26 in com.example.celebquizapp:layout/content_main: Error inflating class fragment
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.widget.RadioGroup.getChildCount()' on a null object reference
at com.example.celebquizapp.SettingsFragment.setRadioButtonListener(SettingsFragment.java:50)
at com.example.celebquizapp.SettingsFragment.onViewCreated(SettingsFragment.java:32)
at androidx.fragment.app.FragmentManagerImpl.ensureInflatedFragmentView(FragmentManagerImpl.java:1144)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:851)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1133)
at androidx.fragment.app.FragmentManagerImpl.addFragment(FragmentManagerImpl.java:1393)
at androidx.fragment.app.FragmentManagerImpl.onCreateView(FragmentManagerImpl.java:3205)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:134)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:357)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:336)
at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1069)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1263)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1119)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.example.celebquizapp.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:7802)
E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

RadioGroup selectionOption = getActivity().findViewById(R.id.selection_option_setting);
It should be
RadioGroup selectionOption = view.findViewById(R.id.selection_option_setting);

I'm getting an error while running my app

When i try to run my app i get this error:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.mysolver/com.example.mysolver.MainActivity}:
java.lang.ClassCastException:
androidx.constraintlayout.widget.ConstraintLayout cannot be cast to
android.widget.Button
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.ClassCastException: androidx.constraintlayout.widget.ConstraintLayout cannot be cast to
android.widget.Button
at com.example.mysolver.MainActivity.onCreate(MainActivity.java:46)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Other people have had this problem but none of the solutions worked for me.
Here is my "content_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:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="#layout/activity_main">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="72dp"
android:onClick="onClick"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:ems="10"
android:hint="Enter letters"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button" />
<ScrollView
android:id="#+id/scrollView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="25dp"
android:layout_marginEnd="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/editText">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/output"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Output will appear here..."
android:textSize="20sp" />
</LinearLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
Here's my "activity_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.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<include
android:id="#+id/button"
layout="#layout/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Here's my "MainActivity.java":
package com.example.mysolver;
import android.content.res.AssetManager;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
public class MainActivity extends AppCompatActivity {
Button butt;
EditText text;
String letters;
TextView mOutput;
processData procDat;
public static final String TAG = MainActivity.class.getName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
Log.d(TAG, "Set up tool bar");
setSupportActionBar(toolbar);
text = findViewById(R.id.editText);
Log.d(TAG, "Set up text");
mOutput = findViewById(R.id.output);
butt = findViewById(R.id.button);
Log.d(TAG, "Set up button");
AssetManager assetManager = getAssets();
InputStream inputStream;
try {
inputStream = assetManager.open("dictionary.txt");
} catch (IOException e) {
inputStream = null;
}
Reader reader = new InputStreamReader(inputStream);
BufferedReader is = new BufferedReader(reader);
procDat = new processData("", is);
Log.d(TAG, "Initialized procDat");
}
public void onClick(View v)
{
Log.d(TAG, "Button clicked");
String output;
letters = text.getText().toString();
procDat.setLetters(letters);
try {
output = procDat.doProcessing();
} catch (IOException e) {
output = "Error while opening file";
}
mOutput.setText(output);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Simply rename the id with other id instead of button. You can't use the same id in two layout since content_main.xml is included in activity_main.xml.
<include
android:id="#+id/button"
layout="#layout/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />

the main problem is in your "AndroidManidfest.xml" file and it is corrected by changing the theme of your application or theme of your activity. here are 3 solutions for that...
Changing the theme of all activity by
"android:theme="#style/Theme.AppCompat"" or by
"android:theme="#style/Theme.MaterialComponents.Light.NoActionBar""
Changing the theme of your application by
"android:theme="#style/Theme.AppCompat"" or by
"android:theme="#style/Theme.MaterialComponents.Light.NoActionBar""
Or by changing your
"androidx.constraintlayout.widget.ConstraintLayout" by
"RelativeLayout" in your "content_main.xml" file
I'm sure that it works...

I want to add horizontally scrolled card view in recyclerview on my Homefragment.java class

Here is my MainActivity.java class
package com.example.bottomnavigationdrawer;
import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.NavigationUI;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.bottomnavigation.BottomNavigationView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView bottomNavigationView=findViewById(R.id.bottomNavigationView);
NavController navController= Navigation.findNavController(this,R.id.nav_host_fragment);
NavigationUI.setupWithNavController(bottomNavigationView,navController);
}
}
Here is my 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">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigationView"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:itemTextColor="#00FAF7F7"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="#menu/bottom_nav_menu" />
<fragment
android:id="#+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="#+id/bottomNavigationView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="#navigation/nav_graph" />
</androidx.constraintlayout.widget.ConstraintLayout>
Here is my HomeFragment.java class:
package com.example.bottomnavigationdrawer;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.smarteist.autoimageslider.SliderView;
/**
* A simple {#link Fragment} subclass.
*/
public class HomeFragment extends Fragment {
public HomeFragment() {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_home, container, false);
SliderView imageView = (SliderView) view.findViewById(R.id.imageSlider);
return view;
}}
Here is my fragment_home.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingBottom="3dp"
android:paddingLeft="3dp"
android:paddingRight="3dp"
android:paddingTop="3dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:gravity="center"
android:textSize="70sp"
android:textColor="#FAF8F8"
android:background="#25212E"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Home" />
</RelativeLayout>
I am new in Android, and I have searched a lot about it. But every tutorial I get they do this with main activity, model,adapter. But I have to do it on my home fragment in main activity.

Actually I don't understand your question. If you want to learn about recyclerview and card view and bottom navigation view, follow this tutorial:
https://www.androidhive.info/2016/01/android-working-with-recycler-view/
https://www.androidhive.info/2017/12/android-working-with-bottom-navigation/
It's very easy. If you want to set scroll horizontal use LinearLayoutManager like this
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView myRecyclerView= (RecyclerView) findViewById(R.id.my_recycler_view);
myRecyclerView.setLayoutManager(layoutManager);

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Inflating a fragment in main activity brings an error - java

You can try with Framelayout instead of fragment like the following  <FrameLayout android:id="#+id/fragment_place" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#FFFFFF" />

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I want to add horizontally scrolled card view in recyclerview on my Homefragment.java class

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