public void onBtnClick(View view) {
        TextView v = findViewById(R.id.displayTextView);
        v.setText(R.string.button_clicked);
    }
Activity running in a private process which is manually defined in the AndroidManifest.xml using
the android:process attribute.
<p>
<p>From D.A.C: "If the name assigned to this attribute begins with a colon (':'), a new process,
private to the application, is created when it's needed and the activity runs in that process."
ui/espresso/MultiProcessSample/app/src/main/java/com/example/android/testing/espresso/multiprocesssample/PrivateProcessActivity.java