개발자들 능력자들

MainActivity.java

public class MainActivity extends ActionBarActivity{

    Button btn[] = new Button[3];
    ViewPager viewPager = null;
    int p=0;   //페이지번호
    int v=1;   //화면 전환 뱡향

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewPager = (ViewPager)findViewById(R.id.viewPager);
        MyViewPagerAdapter adapter = new MyViewPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(adapter);
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <!--
        <Button
            android:id="@+id/btn_a"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="A"
            style="@style/Widget.AppCompat.ActionButton"/>
        <Button
            android:id="@+id/btn_b"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="B"
            style="@style/Widget.AppCompat.ActionButton"/>
        <Button
            android:id="@+id/btn_c"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="C"
            style="@style/Widget.AppCompat.ActionButton"/>
        -->
    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>


</LinearLayout>

fragmentA.java

public class FragmentA extends Fragment{

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        return inflater.inflate(R.layout.fragment_a, container, false);
    }
}

fragment_a.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#5DA4BE">
</LinearLayout>

마찬가지로 fragmentB.java fragmentC.java fragment_b.xml fragment_c.xml 생성