activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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="pyxis.uzuki.live.gpuimageplustest.MainActivity">

    <org.wysaid.view.CameraGLSurfaceView
        android:id="@+id/cameraView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_gravity="bottom"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/btnFilter"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textColor="#fff"
            android:background="#80000000"
            android:text="Filter" />

        <Button
            android:id="@+id/btnCaptrue"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:textColor="#fff"
            android:layout_weight="1"
            android:background="#80000000"
            android:text="Capture" />
    </LinearLayout>
</FrameLayout>