I tried recommended Red Filename resolutions but still have red filenames?

What I was trying to do: I had existing and working functionality in another project, as in one class and one activity, that I copied to this project rather than recreating them.

What I have tried: I included the new activity in the androidmanifest.xml, corrected import and package statements, etc.; I have fixed issues and warnings that were identified or apparent and they have the "green check" with no problems. I tried suggestions such as, invalidating caches and restarting, running an analysis on each file for errors or issues, made updates to the AndroidManifest and if necessary gradle build files, and simply committed to git (VCS) as recommended here at JetBrains and reviewed the recommended link on File Status'.

I'm still fairly new to the inner workings for the IDE and some Android, so I certainly could miss something but it doesn't seem apparent. I was hoping for further thoughts. I posted the two files in question, but I wasn't sure it was all that beneficial if I have the "green check", but maybe someone will see what I don't. This code works in the other project without issue.

Screenshot (requested)

Activity Layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              tools:context=".MainActivityMaster">

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/master_enter_db" />
    <EditText
            android:id="@+id/database_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:autofillHints="@string/master_enter_db"
            android:hint="@string/master_enter_db"
            android:inputType="text"
            android:text="">
    </EditText>
    <Button
            android:id="@+id/addDatabase"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/master_add_db">
    </Button>
    <ListView
            android:id="@+id/database_list"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
    </ListView>
    <Button
            android:id="@+id/useSelectedDatabase"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/master_no_db_selected"
            android:clickable="false"
    >
    </Button>

</LinearLayout>

Activity Class:

package com.mistywillow.researchdb;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.view.View;
import android.widget.*;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.cursoradapter.widget.SimpleCursorAdapter;
import com.mistywillow.researchdb.databases.MasterDatabase;
import com.mistywillow.researchdb.masterdb.dao.MasterDao;
import com.mistywillow.researchdb.masterdb.entity.MasterDatabaseList;

public class MainActivityMaster extends AppCompatActivity {

    MasterDatabase mMasterDB;
    MasterDao mMasterDBDao;
    EditText mDBToAdd;
    Button mAddDB,mUseSelectedDatabase;
    ListView mDatabaseList;
    SimpleCursorAdapter mSCA;
    Cursor mCsr;
    long mSelectedDatabaseId = 0;
    String mSelectedDatabaseName = "";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_master);
        mDBToAdd = this.findViewById(R.id.database_name);
        mAddDB = this.findViewById(R.id.addDatabase);
        mUseSelectedDatabase = this.findViewById(R.id.useSelectedDatabase);
        mDatabaseList = this.findViewById(R.id.database_list);

        mMasterDB = MasterDatabase.getInstance(this);
        mMasterDBDao = mMasterDB.getMasterDao();


        setUpAddDBButton();
        setUpUseSelectedDatabaseButton();
        setOrRefreshDatabaseList();
    }

    private void setUpAddDBButton() {
        mAddDB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mDBToAdd.getText().toString().length() > 0) {
                    if (mMasterDBDao.insert(new MasterDatabaseList(mDBToAdd.getText().toString())) > 0) {
                        mDBToAdd.setText("");
                        setOrRefreshDatabaseList();
                    }
                }
            }
        });
    }
    private void setUpUseSelectedDatabaseButton() {
        mUseSelectedDatabase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mSelectedDatabaseId > 0) {
                    Intent intent = new Intent(view.getContext(),MainActivity.class);
                    intent.putExtra(MainActivity.INTENT_EXTRA_DATABASEID, mSelectedDatabaseId);
                    intent.putExtra(MainActivity.INTENT_EXTRA_DATABASENAME,mSelectedDatabaseName);
                    startActivity(intent);
                }
            }
        });
    }

    private void setOrRefreshDatabaseList() {
        mCsr = mMasterDBDao.getAllDatabasesAsCursor();
        if (mSCA == null) {
            mSCA = new SimpleCursorAdapter(
                    this.getApplicationContext(),
                    android.R.layout.simple_list_item_1,
                    mCsr,
                    new String[]{MasterDatabaseList.COL_DATABASE_NAME},
                    new int[]{android.R.id.text1},
                    0
            );
            mDatabaseList.setAdapter(mSCA);
            mDatabaseList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                /* Handle Clicking on an Item (i.e. prepare UseSelected Button) */
                @SuppressLint("Range")
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                    mSelectedDatabaseId = l;
                    if (l > 0) {
                        mSelectedDatabaseName = mCsr.getString(mCsr.getColumnIndex(MasterDatabaseList.COL_DATABASE_NAME));
                        mUseSelectedDatabase.setText(mSelectedDatabaseName);
                        mUseSelectedDatabase.setClickable(true);
                    } else {
                        mUseSelectedDatabase.setText(R.string.master_no_db_selected);
                        mUseSelectedDatabase.setClickable(false);
                    }
                }
            });
        } else {
            mSCA.swapCursor(mCsr);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        setOrRefreshDatabaseList();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mCsr.close();
    }
}