CODEWITHSUNDEEP
javaandroid
vicolored
vicolored

Reputation: 835

Cannot call method from extended ViewGroup

I have extended a LinearLayout which represents my main ui block and inside this I use two more extended LinearLayout .

If i have to write it down with pseudo code is like this :

Bar extends LinearLayout 
init() //here I initialize the LinearLayout and set some properties.
//the Constructor
    public Bar(Context context, int height ) {
    super(context);
    this.context = context;
    this.height = height;
    init();    //calling init() inside the constructor
}

and inside Bar the code is :

    public void create() {
    upLinearLayout = new UpLinearLayout(context, 40 );
    downLinearLayout = new DownLinearLayout(context, 160);

    this.addView(upLinearLayout);
    this.addView(downLinearLayout);
}

So when I'm on my MainActivity I give :

    Bar bb = new mBar(this, 300);
    bar.create();

where create() is :

public void create() {
    upLinearLayout = new UpLinearLayout(context, 40 );
    downLinearLayout = new DownLinearLayout(context, 160);

    this.addView(upLinearLayout);
    this.addView(downLinearLayout);
}

So far the code is working great. But I cannot call from Bar methods that belong to upLinearLayout or downLinearLayout e.g. :

    public void anotherButton(Context context) {
    Button button1 = new Button(context);
    button1.setText("Testing");
    button1.setTextSize(18);
    this.addView(button1);
}

Now inside the Bar class I can't do:

        UpLinearLayout up = new UpLinearLayout(context, 65);
    up.anotherButton(context);

it gives me error :

Error:(47, 11) error: cannot find symbol method anotherButton(Context)

tl;dr In MainActivity I can call all public methods of Bar - but I can't do the same inside extended Bar for other extended classes. What I can do is only initialize them.

create()

Upvotes: 1

Views: 68

Answers (1)

Blackbelt
Blackbelt

Reputation: 157457

Now inside the Bar class I can't do:

UpLinearLayout up = new UpLinearLayout(context, 65);
up.anotherButton(context);

you can't because anotherButton is a method of Bar, but you are calling on an instance of UpLinearLayout which has not a method call anotherButton. If you want to add a Button to UpLinearLayout from bar you could do:

public void anotherButton(LinearLayout layout) {
    Button button1 = new Button(getContext());
    button1.setText("Testing");
    button1.setTextSize(18);
    layout.addView(button1);
}

and then call it like anotherButton(up);

or add anotherButton in UpLinearLayout. And don't forget to cast to the exact type if you declared your member with the Base class. E.g.

You declared

LinearLayout upperLayout;

if you want to access a method of your custom 

UpperLinearLayout extend LinearLayout

you have to cast upperLayout explicitly to UpperLinearLayout

Upvotes: 1

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