Android: One activity's text color won't adopt dark theme

I changed the theme to dark in styles.xml:

<style name="AppTheme" parent="Theme.AppCompat">


and 2 of the 3 activities seem to have adjusted well:

But then the the other activity did not adjust well:

I am not sure why this is happening. Now this is a simplified version of my code that repeats the problem:

public class WorkoutActivity extends AppCompatActivity {

public static final String EXTRA_DAY = "blah";

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

Intent dayNumIntent = getIntent();
String dayExtra = dayNumIntent.getStringExtra(EXTRA_DAY);

LayoutParams linearLayoutParams = new LayoutParams(-1, -2, 1);
LayoutParams exercisePrevParams = new LayoutParams(0, -1, 4);

TextView topText = findViewById(R.id.dayText);
topText.setText(dayExtra);

LinearLayout mLinearLayout = findViewById(R.id.workout_layout);

LinearLayout statLabelLayout = new LinearLayout(getApplicationContext());
statLabelLayout.setOrientation(LinearLayout.HORIZONTAL);

statLabelLayout.addView(defaultTextView(getResources().getString(R.string.previous), 16), exercisePrevParams);
mLinearLayout.addView(statLabelLayout, linearLayoutParams);

}

private TextView defaultTextView (String text, int textSize){
TextView textView = new TextView(getApplicationContext());
textView.setText(text);
textView.setGravity(Gravity.CENTER);
textView.setTextSize(textSize);
return textView;
}

}


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