How get ratingbar value in a toast?

See more:

Java

Android

I appreciate your help with a problem with the ratingbar, I want to show the value of the ratingbar in a Toast when pressing a button, therefore each time you press the button, the value of the ratingbar should be displayed, however at the time pressing the button closes the application and debugging I get the following error.

"Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'float android.widget.RatingBar.getRating()' on a null object reference at com.org.notas.asembisencuesta.MainActivity.onClick(MainActivity.java:114) "

What I have tried:

<pre lang="java">```@Override
protected void onCreate(Bundle savedInstanceState) {
commentsFra = new ComentariosFragment();
navhost = new HomeFragment();
thanks = new ThanksFragment();
}

public void onClick(View view){
ratingBar = findViewById(R.id.ratingBarOne);
transaction = getSupportFragmentManager().beginTransaction();
switch (view.getId()){

case R.id.fin_encuesta:
transaction.replace(R.id.nav_host_fragment, thanks);
transaction.addToBackStack(null);
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.nav_host_fragment, navhost);
transaction.addToBackStack(null);
transaction.commit();
}
};
handler.postDelayed(runnable,7000);
comments = findViewById(R.id.comments_dialog);
comments.setText("");
float rating;
rating = ratingBar.getRating(); //Linea 114
Toast.makeText(this, ":" + rating, Toast.LENGTH_SHORT).show();
break;
}
transaction.commit();
}} ```


Y este es el error que me genera:


E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.org.notas.asembisencuesta, PID: 7682
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(.java:414)
at android.view.View.performClick(View.java:7146)
at android.view.View.performClickInternal(View.java:7119)
at android.view.View.access$3500(View.java:803)
at android.view.View$(View.java:27533)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7386)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(.java:409)
at android.view.View.performClick(View.java:7146)
at android.view.View.performClickInternal(View.java:7119)
at android.view.View.access$3500(View.java:803)
at android.view.View$(View.java:27533)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7386)
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:980)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'float android.widget.RatingBar.getRating()' on a null object reference
at com.org.notas.asembisencuesta.MainActivity.onClick(MainActivity.java:114)
at java.lang.reflect.Method.invoke(Native Method)```