How to start new activity on button click? || Intent

 <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical" android:layout_width="fill_parent"

          android:layout_height="fill_parent">
<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="next activity"
        android:onClick="goToActivity2"
        />
</LinearLayout>

In Java class:

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
Button button;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button=(Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,NextActvity.class);
                startActivity(intent);
            }
        });
    }
}

In next activity add following code
for activity_next.xml 

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".NextActvity">

    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:text="Activity 2" />
</RelativeLayout>

In nextactivit.java left at as it is.. 

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class NextActvity extends AppCompatActivity {

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_next_actvity);
    }
}





When We Run App