http://www.sqlite.org/foreignkeys.html"This document describes the support for SQL foreign key constraints introduced in SQLite version 3.6.19."

In Froyo it's SQLite version 3.6.22, so ...

EDIT: to see sqlite version : adb shell sqlite3

Foreign key constraints with on delete cascade are supported, but you need to enable them. I just added the following to my SQLOpenHelper, which seems to do the trick.

@Override  public void onOpen(SQLiteDatabase db)  {   super.onOpen(db);   if (!db.isReadOnly())   {    // Enable foreign key constraints    db.execSQL("PRAGMA foreign_keys=ON;");   }  } 

I declared my referencing column as follows.

mailbox_id INTEGER REFERENCES mailboxes ON DELETE CASCADE