How to instantiate an object of an Activity Class from non-Activity Class?

Question

I am creating a java class that DOES NOT extends Activity, and in its constructor, I want to instantiate an object from another class that instantiate SQLiteOpenHelper . The problem is, when instantiating an object of the SQLiteOpenHelper class I need to pass a Context of the current class that DOES NOT extend Activity. What argument should I pass to an instance of the SQLiteOpenHelper .

Constructor of SQLiteOpenHelper:

public class MPLDataBase extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 2;
private static final String DATABASE_NAME = "MPL.db";
private static final String MPL_TABLE_NAME = "MPLData";

public MPLDataBase(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);

}

Class that instantiate SQLiteOpenHelper: This is a NON_ACTIVITY Class

public class NotifyArrayAdapter {

private MPLDataBase mplOpenHelperDB = null;
private SQLiteDatabase sqliteDB = null;
private int itemClickedPos;

public NotifyArrayAdapter() {
    mplOpenHelperDB = new MPLDataBase(WHAT_SHOULD_I_PASS_HERE);
}

NotifyArrayAdapterClass

public class NotifyArrayAdapter {

private MPLDataBase mplOpenHelperDB = null;
private SQLiteDatabase sqliteDB = null;
private int itemClickedPos;

public NotifyArrayAdapter(Context context) {
    if (this.mplOpenHelperDB == null) {
        this.mplOpenHelperDB = new MPLDataBase(context);
    }
    if (this.sqliteDB == null) {
        this.sqliteDB = mplOpenHelperDB.getWritableDatabase();
    }

}
public void deleteAtPos(int pos) {
    if(! this.sqliteDB.isOpen()) {
        this.sqliteDB = mplOpenHelperDB.getWritableDatabase();
    }
    this.itemClickedPos = pos;
    int [] dbIDs = this.mplOpenHelperDB.getIDs();
    mplOpenHelperDB.deleteRow(dbIDs[this.itemClickedPos]);
}

public void deleteAllDBRows() {
    if(! this.sqliteDB.isOpen()) {
        this.sqliteDB = mplOpenHelperDB.getWritableDatabase();
    }
    mplOpenHelperDB.deleteALLRows();
}

}

Answer 1

You need to pass current context to your MPLDataBase constructor

 public NotifyArrayAdapter(Context con) {
  mplOpenHelperDB = new MPLDataBase(con);
 }

like if you call this from any Activity then

 NotifyArrayAdapter notifyarrayAdapter = new NotifyArrayAdapter(yourActivity.This);

like if you call this from any Fargment then

 NotifyArrayAdapter notifyarrayAdapter = new NotifyArrayAdapter(getActivity());