About menu crash after press it - android-studio

Question

I do not know what error I have. I already put MainActivity between new Intent and this.
This is my mainactivity.java
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.:
Intent intent = new Intent(MainActivity.this, AboutActivity.class);
startActivity(intent);
break;
}
return super.onOptionsItemSelected(item);
}
This is menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/about"
android:title="About"
app:showAsAction="never"/>
</menu>
This is AboutActivity.java
package com.example.zakatcalculator;
import android.os.Bundle;
import android.text.method.LinkMovementMethod;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class AboutActivity extends AppCompatActivity {
TextView textView;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
textView = findViewById(R.id.textViewLink);
textView.setMovementMethod(LinkMovementMethod.getInstance());
}
}
And this is AndroidManifest.xml
<activity
android:name=".AboutActivity"
android:exported="false">
</activity>
When I press about button, then its crash.

Answer 1

public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.about:
Intent intent = new Intent(MainActivity.this, AboutActivity.class);
startActivity(intent);
break;
}
return super.onOptionsItemSelected(item);
}
replace R.id. to this R.id.about and try again.