Layout App

 Main Activity 

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Intents: facilitates communication bet. different components of an app,
        //          as well as bet. different applications.
        // types of intents:
        // 1- Explicit Intents
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                goToSecondActivity();
            }
        });

        // 2- Implicit Intents
        Button btn2 = findViewById(R.id.openBrowser);
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openWebPage();
            }
        });


    }

    public void goToSecondActivity(){
        Intent intent = new Intent(this, SecondActivity.class );
        startActivity(intent);
    }

    public void openWebPage(){
        Uri webpage = Uri.parse("https://www.google.com");
        Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
        startActivity(intent);
    }
}

Second Activity

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second2);
    }
}


Main XML

<Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go to Second Activity"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/openBrowser"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="26dp"
        android:layout_marginBottom="91dp"
        android:text="Go to Google"
        app:layout_constraintBottom_toTopOf="@+id/btn"
        app:layout_constraintStart_toStartOf="@+id/btn" />

Second Activity XML


<TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="292dp"
        android:layout_marginEnd="4dp"
        android:text="Welcome to Second Activity"
        android:textSize="32sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

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