inflate

private View rootViewFirst;

    private View rootViewSecond;

    private View hh;

    private Button click;

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

        hh = findViewById(R.id.hh);
        rootViewFirst = findViewById(R.id.first);
        rootViewSecond = findViewById(R.id.second);
        click = (Button) findViewById(R.id.click);
        // view =
        // LayoutInflater.from(ListenerTestActivity.this).inflate(R.layout.mian_item,
        // null)

        View view = LayoutInflater.from(MainActivity.this).inflate(
                R.layout.first, null);

        ((ViewGroup) rootViewFirst).addView(view);

        click.setOnClickListener(this);

        // findViewById();
        // initView();

    }

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

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

    <Button
        android:id="@+id/click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click" />

    <FrameLayout
        android:id="@+id/hh"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/click" >

        <FrameLayout
            android:id="@+id/first"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </FrameLayout>

        <FrameLayout
            android:id="@+id/second"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </FrameLayout>
    </FrameLayout>

</RelativeLayout>

<?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" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Second" />

</LinearLayout>