It may have to do with the initialization of the database during the
construction of your TabActivity:
base baseDatos = new base(this,"programacion",null,1);
SQLiteDatabase db = baseDatos.getWritableDatabase();
These fields are assigned during the construction of your TabActivity.
Move these two lines into your onCreate, where your TabActivity should be
initialized.
...
base baseDatos;
SQLiteDatabase db;
...
public void onCreate(Bundle savedInstanceState) {
...
...
baseDatos = new base(this,"programacion",null,1);
db = baseDatos.getWritableDatabase();
...
}
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