android custom view not inflating

I made a custom view that extends the View class:

 import android.content.Context;
 import android.graphics.Canvas;
 import android.view.View;

 public class DrawSurfaceView extends View
 {

private ButtonsManager BM;
public DrawSurfaceView(Context context) {
    super(context);

}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    BM.draw(canvas);
}


}

I included it in the xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
 >

        <TextureView
        android:id="@+id/gameSurface"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

                    <com.example.trashedometer.DrawSurfaceView
                android:id="@+id/drawingSurface"
                android:layout_width="match_parent"
                android:layout_height="match_parent" 
                />

</FrameLayout>

But in the main code when it sets the content view it says it can't inflate my custom view, why?

 setContentView(R.layout.activity_main);

Copyright Notice：Content Author:「Jonathan Vukadinovic」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/33726279/android-custom-view-not-inflating