Android Studio Opening an activity - android-studio

Question

I am trying to open an activity with in an activity. I succeeded to do to from MainActivity but for some reason, this wont allow me to do so again.
I am very new to this, please help me.
package com.example.edonfreiner.siddur;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Davening extends AppCompatActivity {
Button shacharisButton, minchaButton, maarivButton;
public void openShacharis() {
shacharisButton = (Button) findViewById(R.id.shacharis);
shacharisButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent open = new Intent(Davening.this, Shacharis.class);
startActivity(open);
}
});
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_davening);
openShacharis();
}
}
This is the code to my class, there are no errors, meaning all buttons and references exist in the XML file.
Thank you in advance.

Answer 1

The logic you built is mistaken, cause you are calling a function in your onCreate that will not activate the onClick inside it. And when you click your object, it does not activate the onClick because this is encapsulated inside openShacharis. So the solution is to take off onClick from openShacharis, this way:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_davening);
shacharisButton = (Button) findViewById(R.id.shacharis);
shacharisButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openShacharis();
}
});
}
public void openShacharis() {
Intent open = new Intent(Davening.this, Shacharis.class);
startActivity(open);
}

Answer 2

All activities need to be registered on the Android Manifest.
As you stated on your comment, if you don't have it registered, it won't open.
This documentation will probably help you. In particular the part where it Adds the required <activity> element in AndroidManifest.xml.