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OnClickListener doesn't work in a fragment

I have here a problem with the onClicklistener method in a fragment. If I click on the button nothing happens and I don't know why. No error and no output.
I've tried to implements the OnClickListener or set a (Button) before the view.findViewById(R.id.button); but nothing helps.
I've seen much questions here in Stack Overflow about this problem but no solution from there helps me :/
Do you have any ideas? Thank You!
package com.christoph.myapplication.ui.home;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import com.christoph.myapplication.R;
public class HomeFragment extends Fragment {
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_home, container, false);
final Button button= view.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
button.setBackgroundColor(Color.RED);
System.out.println("Hallo");
}
});
return view;
}
}

You can add click listener rather in onViewCreated function. Try it and let me know if it works. Check android fragment lifecycles documentation for more info.
Cheers

Required: com.app.appname.mainactivity, Found: androidx.fragment.app.FragmentActivity

I just started to work in android studio. Tutorials are helping and all, but I can't find any help for this problem (it might be obvious, but I don't see it).
My problem comes after implementing the communication between the fragment activity and main activity.
Error after compiling is:
error: incompatible types: FragmentActivity cannot be converted to MainActivity
After going to where the error is, it says:
Incompatible types.
Required: com.app.appname.mainactivity
Found: androidx.fragment.app.FragmentActivity
This is the code for my fragment, where the error happens:
(names are in my language)
package com.ors.herobomb;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Uspeh extends Fragment {
EditText upis;
Button poslji;
public Uspeh() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View p = inflater.inflate(R.layout.fragment_uspeh, container, false);
upis = p.findViewById(R.id.hero);
poslji = p.findViewById(R.id.poslji);
poslji.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String ode = upis.getText().toString();
if(ode.length()>1){
MainActivity main = getActivity();
main.send(ode);
}
}
});
return p;
}
}

Answer provided by Daniel.
Replacing:
MainActivity main = getActivity();
With:
MainActivity main = (MainActivity) getActivity();
Solved my problem.

Cannot create widget in Android Fragment

I am trying to create edittext using Java in bottom fragment class based on input that is to be passed from top fragment. But when I type
Button add_submit = new Button(this);
I get error for the this for parameter. However I can use this code in MainActivity.java.
Why is this so? What is causing the error and how to fix it?
The following are the complete code for the class
package com.test.gpacalc;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
public class AddActivityBottom extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_add_bottom,container,false);
return view;
}
public void createAddInput(String number_of_subjects){
Button add_submit = new Button(this);
}
}

Button constructor requires context as an argument. Fragment doesn't implement it, activity does. try new Button(getActivity())

NavigationDrawer's menu is not working

When I click at the menu items, then layouts not coming to view.
And MainActicity wanna "menu1_Fragment.java" encode with "android.support.v4.app.Fragment"
İf I encode only "Fragment", MainActivity is getting error.
In compatible types.
Required :android.support.v4.app.Fragment
Found :intizamyazilim.navigationdrawernew.menu1_Fragment
Here is menu1_Fragment.java
package intizamyazilim.navigationdrawernew;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Administrator on 01.03.2015.
*/
public class menu1_Fragment extends android.support.v4.app.Fragment {
View rootview;
#Nullable
// #Override
public View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.menu1_layout, container, false);
return rootview;
}
}

I Fix it.
I changed this "menu1_Fragment.java" with this codes:
package intizamyazilim.navigationdrawernew;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class menu1_Fragment extends android.support.v4.app.Fragment {
public menu1_Fragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.menu1_layout, container, false);
return rootView;
}
}

No it is not the proper way to fix it. The proble here is that you are extending your menu1_Fragment using support library and on the other hand you are importing fragment from SDK(import android.app.Fragment;). Make it consistent. Either use fragment from support or from android SDK.

Android Fragment Code issue

I'm wondering how I can get the code below to work with my project as to combine the two so that it could work. What I have is an implemented Navigation Drawer in the app
1st Java Code Using Fragment:
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PagesFragment extends Fragment {
public PagesFragment(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_pages, container, false);
return rootView;
}
}
2nd Java Code Using Activity:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class AppointmentActivity extends Activity {
Button sendEmail;
EditText msg;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.appointment_layout);
sendEmail = (Button) findViewById(R.id.sndBtn);
sendEmail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
msg = (EditText) findViewById(R.id.msgTxt);
String message = msg.getText().toString();
sendEmail(message);
}
});
}
protected void sendEmail(String message) {
String[] to=new String[]{"Shop#email.com"};
String subject=("Shop Appointment");
Intent emailIntent = new Intent(Intent.ACTION_SEND);
emailIntent.putExtra(Intent.EXTRA_EMAIL, to);
emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
emailIntent.putExtra(Intent.EXTRA_TEXT, message);
emailIntent.setType("message/rfc822");
startActivity(Intent.createChooser(emailIntent, "Gmail"));
}
}
I've tried to combine the two myself but I don't have a lot of experience dealing with android to know how to make both of these codes work side by side and not give me a force close. Anything would be helpful!

To combine these codes, you need to declare your Activity like a FragmentActivity (it will be "host" your Fragment). See this answer: https://stackoverflow.com/a/10609839/2668136
And Google training Fragment
Also Google documentation FragmentActivity
Hope this help.