Button that calls another screen and another button on the new screen that goes back to the old screen

Question

How can I make a button that calls another screen, and on the other screen have a button that when you click, goes back to the home screen?

Answer 1

Screen 1

final Button myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(View.OnClickListener {
    @Override
    public void onClick(View v) {
        Intent i = new Intent(this@Tela1, Tela2.class);
        startActivity(i);
    }
});

Screen 2

You can use any button or even set a navigation button on your Toolbar.

 <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="#fff"
            app:navigationIcon="@drawable/ic_back" /> <!-- este é o icone de navegação -->

And in the class of Screen 2:

final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

toolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        finish();
    }
});

You can also use a button whatever the result will be the same. What happens above is that you start a new Activity, but the previous one continues in the Stack, that is, it was not finished, only paused. So, when giving Finish, she is reopened as she has remained in the line of activities.

Feel free to ask new questions in the comment of this answer if there are any questions.