Android- is it possible to open an activity using preference headers?

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Java

Android

I have preference headers xml file like this:

<header android:id="@+id/roi"
    android:title="   ROI"
    android:icon="@drawable/baseline_fullscreen_black_24dp"
    >
    <intent
        android:action="android.intent.action.VIEW"
        android:targetPackage="com.lambdahash.sonic.ui_app"
        android:targetClass="com.lambdahash.sonic.ui_app.fragments.exampleActivity" />
</header>

I want to open an actvity like this:

public class exampleActivity extends Activity implements DrawPolygonCanvas.OnGetBitmapListener {

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

Here, activity_example.xml is not a preference file, it's a layout xml file.
How do I open exampleActivity from a preference-headers xml file?

What I have tried:

I have tried opening it with a header file and I am getting this error:

 Caused by: android.view.InflateException: Binary XML file line #19: Binary XML file line #19: Error inflating class com.lambdahash.sonic.example.draw.senapr.DrawPolygonCanvas
     

Caused by: android.view.InflateException: Binary XML file line #19: Error inflating class com.lambdahash.sonic.example.draw.senapr.DrawPolygonCanvas