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My app crashed when clicking new dependency question. I don't know what is the error and how to solved it [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed last year.
Error
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.login, PID: 6969
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.login/com.example.login.NavigationDrawer}: android.view.InflateException: Binary XML file line #15: Binary XML file line #19: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: android.view.InflateException: Binary XML file line #15: Binary XML file line #19: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #19: Error inflating class fragment
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View com.google.android.material.navigation.NavigationView.getHeaderView(int)' on a null object reference
at com.example.login.ui.questionnaire.QuestionnaireFragment.onCreateView(QuestionnaireFragment.java:80)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2995)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:523)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261)
at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1374)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2841)
at androidx.fragment.app.FragmentManager.dispatchViewCreated(FragmentManager.java:2777)
at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3020)
at androidx.fragment.app.FragmentStateManager.ensureInflatedView(FragmentStateManager.java:394)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:260)
at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:142)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:295)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:274)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:784)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:867)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:999)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:999)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
at android.view.LayoutInflater.inflate(LayoutInflater.java:519)
at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
at com.example.login.databinding.ActivityNavigationDrawerBinding.inflate(ActivityNavigationDrawerBinding.java:54)
at com.example.login.databinding.ActivityNavigationDrawerBinding.inflate(ActivityNavigationDrawerBinding.java:48)
E/AndroidRuntime: at com.example.login.NavigationDrawer.onCreate(NavigationDrawer.java:42)
at android.app.Activity.performCreate(Activity.java:7224)
at android.app.Activity.performCreate(Activity.java:7213)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873
Java Code
package com.example.login;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import com.example.login.databinding.ActivityNavigationDrawerBinding;
import com.google.android.material.navigation.NavigationView;
import com.google.android.material.snackbar.Snackbar;
public class NavigationDrawer extends AppCompatActivity {
private AppBarConfiguration mAppBarConfiguration;
private ActivityNavigationDrawerBinding binding;
private String username;
private EditText etUsername;
Pref pref;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pref = new Pref(getApplicationContext());
//get username from login page
username = pref.getUsername();
//System.out.println("username in 2nd "+username);
binding = ActivityNavigationDrawerBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
//setContentView(binding.navView);
setSupportActionBar(binding.appBarNavigationDrawer.toolbar);
binding.appBarNavigationDrawer.fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = binding.drawerLayout;
NavigationView navigationView = binding.navView;
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_questionnaire, R.id.nav_submitsurvey, R.id.nav_responses, R.id.nav_imagecapture, R.id.nav_dashboard)
.setOpenableLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_navigation_drawer);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.navigation_drawer, menu);
//display welcome username
etUsername = findViewById(R.id.welcomeUsername);
etUsername.setText(username);
Button button_log_out = findViewById(R.id.button_log_out);
button_log_out.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
logoutDialog();
}
});
return true;
}
#Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_navigation_drawer);
return NavigationUI.navigateUp(navController, mAppBarConfiguration)
|| super.onSupportNavigateUp();
}
public void logoutDialog() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("LogOut Alert!");
alertDialog.setMessage("Are you sure want to LogOut this Application?");
alertDialog.setCancelable(true);
alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
pref.setLogin("no");
dialog.dismiss();
Intent intent = new Intent(NavigationDrawer.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}
}

you have a NullPointerException. You should check whether the data you receive is full. For example
if(data != null){
.
.
.
...
}

Android application crashes in emulator with java code [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 1 year ago.
My android application crashes in emulator. The application did not open in emulator. I am working with java. It was working perfectly before i added the bottom navigation into my application. Please sort out my issue as i am new in this field. Here is the code of my main activity below.
package com.example.bottomnavigation;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;
import com.example.bottomnavigation.databinding.ActivityMainBinding;
import com.google.android.material.bottomnavigation.BottomNavigationView;
public class MainActivity extends AppCompatActivity {
ActivityMainBinding binding;
ImageView picture, video, message, mail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
getSupportActionBar().hide();
binding.bottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.first:
FragmentTransaction firsttrans = getSupportFragmentManager().beginTransaction();
firsttrans.replace(R.id.frame, new HomeFragment());
firsttrans.commit();
break;
case R.id.search:
FragmentTransaction searchtrans = getSupportFragmentManager().beginTransaction();
searchtrans.replace(R.id.frame, new SearchFragment());
searchtrans.commit();
break;
case R.id.exit:
new AlertDialog.Builder(MainActivity.this)
.setTitle("Exit")
.setIcon(R.drawable.exit)
.setMessage("Are you sure you want to exit")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finishAffinity();
}
}).show();
}
return true;
}
});
picture = findViewById(R.id.arham);
picture.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Pictures.class);
startActivity(intent);
}
});
}
}
Here is the logcat
2021-04-05 12:35:38.662 19375-19375/? E/ottomnavigatio: Unknown bits set in runtime_flags: 0x8000
2021-04-05 12:35:40.544 19375-19375/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.bottomnavigation, PID: 19375
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bottomnavigation/com.example.bottomnavigation.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.hide()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
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: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.hide()' on a null object reference
at com.example.bottomnavigation.MainActivity.onCreate(MainActivity.java:27)
at android.app.Activity.performCreate(Activity.java:7802)
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.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
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) 

The exception is being thrown because you are calling hide() on a null reference to an ActionBar. Assuming that this is the relevant code, it is occurring on this line:
getSupportActionBar().hide();
If you read the javadocs (here and here) for getSupportActionBar() you will see that it returns null if the activity doesn't have an action bar. That must be happening here.
(So why is your app trying to hide the activity bar when it doesn't have one??)
It would appear that the solution is to delete the offending line. Or if there are contexts in which your app might have an action bar, change it to:
ActionBar bar = getSupportActionBar();
if (bar != null) {
bar.hide();
}

Showing error while adding 4 menu (items) in BottomNavigationView

I am new to android .. trying to build application that is having webview inside fragment and in the bottom it is having BottomNavigationView on click of particular item fragment change according to click .
every thing is working fine when having 3 items in BottomNavigationView when i add 4 app start crashing .
error is as fallows -
E/AndroidRuntime: FATAL EXCEPTION: main
Process: in.xparticle.digitalkabadi, PID: 23369
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.xparticle.digitalkabadi/in.xparticle.digitalkabadi.MainActivity}: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
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:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:940)
Caused by: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
Caused by: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:854)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1006)
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.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:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at in.xparticle.digitalkabadi.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:7824)
at android.app.Activity.performCreate(Activity.java:7813)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
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:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:940)
E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setImportantForAccessibility(int)' on a null object reference
at androidx.core.view.ViewCompat.setImportantForAccessibility(ViewCompat.java:1119)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:104)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:87)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:83)
at com.google.android.material.bottomnavigation.BottomNavigationMenuView.getNewItem(BottomNavigationMenuView.java:606)
at com.google.android.material.bottomnavigation.BottomNavigationMenuView.buildMenuView(BottomNavigationMenuView.java:538)
at com.google.android.material.bottomnavigation.BottomNavigationPresenter.updateMenuView(BottomNavigationPresenter.java:67)
at com.google.android.material.bottomnavigation.BottomNavigationView.inflateMenu(BottomNavigationView.java:344)
at com.google.android.material.bottomnavigation.BottomNavigationView.<init>(BottomNavigationView.java:226)
at com.google.android.material.bottomnavigation.BottomNavigationView.<init>(BottomNavigationView.java:133)
... 28 more
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
bottomNav.setOnNavigationItemSelectedListener(navListener);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new HomeFragment()).commit();
}
private BottomNavigationView.OnNavigationItemSelectedListener navListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()){
case R.id.nav_home:
selectedFragment = new HomeFragment();
break;
case R.id.nav_scrape_price:
selectedFragment = new ScrapePriceFragment();
break;
case R.id.nav_aboutUs:
selectedFragment = new AboutUsFragment();
break;
case R.id.nav_scrape_Process:
selectedFragment = new AboutUsFragment();
break;
}
assert selectedFragment != null;
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
selectedFragment).commit();
return true;
}
};
}

try this -->
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//loading the default fragment
loadFragment(new FirstFragment());
//getting bottom navigation view and attaching the listener
BottomNavigationView navigation = findViewById(R.id.bottom_navigation);
navigation.setOnNavigationItemSelectedListener(this);
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fragment = null;
switch (item.getItemId()) {
case R.id.id1:
fragment = new FirstFragment();
break;
case R.id.id2:
fragment = new SecondFragment();
break;
case R.id.id3:
fragment = new thirsFragment();
break;
case R.id.id4:
fragment = new fourthFragment();
break;
}
return loadFragment(fragment);
}
private boolean loadFragment(Fragment fragment) {
//switching fragment
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit();
return true;
}
return false;
}
}

MainActivity cannot be cast to Fragment

Im working on this project. When i run the program it have some runtime errors and app does not appears in emulator. it show the message app stopped. I think there is a error in OnAttach method. I tried many ways to solve the issue but nothing works.I'm new to Android development please help me to solve the issue.
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.workout, PID: 26059
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.workout/com.example.user.workout.MainActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2534)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2614)
at android.app.ActivityThread.access$800(ActivityThread.java:178)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5643)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.example.user.workout.MainActivity.onCreate(MainActivity.java:14)
at android.app.Activity.performCreate(Activity.java:6100)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2481)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2614) 
at android.app.ActivityThread.access$800(ActivityThread.java:178) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:194) 
at android.app.ActivityThread.main(ActivityThread.java:5643) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
Caused by: java.lang.ClassCastException: com.example.user.workout.MainActivity cannot be cast to com.example.user.workout.WorkoutListFragment$WorkoutListListener
at com.example.user.workout.WorkoutListFragment.onAttach(WorkoutListFragment.java:53)
at android.support.v4.app.Fragment.onAttach(Fragment.java:1340)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1372)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1659)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1905)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3715)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:114)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:374)
at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:68)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
at com.example.user.workout.MainActivity.onCreate(MainActivity.java:14) 
at android.app.Activity.performCreate(Activity.java:6100) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2481) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2614) 
at android.app.ActivityThread.access$800(ActivityThread.java:178) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:194) 
at android.app.ActivityThread.main(ActivityThread.java:5643) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
package com.example.user.workout;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class WorkoutListFragment extends ListFragment {
static interface WorkoutListListener{
void itemClicked(long id);
};
private WorkoutListListener listener;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String [] names = new String[Workout.workouts.length];
for(int i =0; i < names.length;i++)
{
names[i] = Workout.workouts[i].getName();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
inflater.getContext(), android.R.layout.simple_list_item_1,names);
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
this.listener = (WorkoutListListener)activity;
}
#Override
public void onListItemClick(ListView l, View v, int position, long id)
{
if(listener!=null)
{
listener.itemClicked(id);
}
}
}
package com.example.user.workout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void itemClicked(long id)
{
WorkoutDetialFragment detials = new WorkoutDetialFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
detials.setWorkoutId(id);
ft.replace(R.id.fragment_container,detials);
ft.addToBackStack(null);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}

Your activity should implement *WorkoutListListener* interface and override its method itemClicked().
public class MainActivity extends AppCompatActivity implements WorkoutListListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public void itemClicked(long id){
// handle your click here
}
}

I run my android app and no app launches and gives errors in the log? How do I fix? [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 3 years ago.
I just got done one part of my code and went to launch the app and everything went fine. The build was successful and no issues were found. I then go to the emulator and the app doesn't launch and the log shows a lot of error.
Anyone know where I messed up and how I can fix it.Below is the errors from the log that I receive and I also pasted in the code that I was working on.
2019-05-07 13:06:14.358 22792-22792/com.example.drunktankfix E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.drunktankfix, PID: 22792
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.drunktankfix/com.example.drunktankfix.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.EditText.setText(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.EditText.setText(int)' on a null object reference
at com.example.drunktankfix.MainActivity.onCreate(MainActivity.java:55)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6669) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
2019-05-07 13:06:16.368 22792-22792/com.example.drunktankfix I/Process: Sending signal. PID: 22792 SIG: 9
Also here is the code:
package com.example.drunktankfix;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.example.drunktankfix.AppFragment;
import com.example.drunktankfix.BlacklistFragment;
import com.example.drunktankfix.HelpFragment;
import com.example.drunktankfix.HomeFragment;
//implement the interface OnNavigationItemSelectedListener in your activity class
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
Button Save;
EditText edt1, edt2, edt3;
int in;
Float fl;
String st;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//loading the default fragment
loadFragment(new HomeFragment());
//getting bottom navigation view and attaching the listener
BottomNavigationView navigation = findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(this);
Save = (Button) findViewById(R.id.BtnSave);
edt1 = (EditText) findViewById(R.id.editText1);
edt2 = (EditText) findViewById(R.id.editText2);
edt3 = (EditText) findViewById(R.id.editText3);
// to Retrieve the Data from the SharedPref
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
int in1= prefs.getInt("in",0);
edt1.setText(in1);
float fl1 = prefs.getFloat("fl", 0);
edt2.setText(""+fl1);
String st1 = prefs.getString("st","");
edt3.setText(st1);
Save.setOnClickListener (new View.OnClickListener() {
#Override
public void onClick(View v) {
in = Integer.parseInt(edt1.getText().toString());
fl = Float.parseFloat(edt2.getText().toString());
st = edt3.getText().toString();
// To save the data that is entered
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt("in", in);
editor.putFloat("fl", fl);
editor.putString("st", st);
editor.apply();
}
});
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fragment = null;
switch (item.getItemId()) {
case R.id.navigation_home:
fragment = new HomeFragment();
break;
case R.id.navigation_Apps:
fragment = new AppFragment();
break;
case R.id.navigation_Blacklist:
fragment = new BlacklistFragment();
break;
case R.id.navigation_Help:
fragment = new HelpFragment();
break;
}
return loadFragment(fragment);
}
private boolean loadFragment(Fragment fragment) {
//switching fragment
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container, fragment)
.commit();
return true;
}
return false;
}
}

You can not enter int value inside the edit text . Try to make it string.
edt1.setText(in1+"");

To set the integer propertly do the following:
edt1.setText("" + integer);
or better solution:
edt1.setText(String.valueOf(integer));

I am not sure how are you getting Nullpointer Exception But from the I code, I see any issue with your here.
editText.setText(Integer Value)
You are setting integer value to Edit text, So that in turn tries to get String resource based on the integer which you set to EditText.That should throw Resource not found Exception not NPE.