Change the margin of a CheckBox dynamically

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Change the margin of a CheckBox dynamically

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#1 by (1 votes)

1

Can this attribute be dynamically changed in the java code?

android:layout_marginTop

I have a dynamically generated CheckBox , and I need to have a margin.

Java code:

CheckBox cb = new CheckBox(this);
//cb.setId();
//cb.setText();
cb.setChecked();
_relativeLayout.addView(cb);

Without the margin, it looks like this:

One on top of the other.

EDITION:

With the margin, it is not displayed.

ViewGroup.MarginLayoutParams ml = new ViewGroup.MarginLayoutParams(10, 10);
ml.setMargins(0, 5, 0, 0);
CheckBox cb = new CheckBox(this);
//cb.setId();
//cb.setText();
cb.setChecked(true);
cb.setLayoutParams(ml);
_relativeLayout.addView(cb);

EDITION 2

RelativeLayout.LayoutParams ml = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
ml.setMargins(0, 5, 0, 0);
for (int i = 0; i < json.length(); i++) {   
    CheckBox cb = new CheckBox(this);
    //ml.addRule(RelativeLayout.BELOW, _relativeLayoutCbIngredientes);
    cb.setLayoutParams(ml);
    _relativeLayoutCbIngredientes.addView(cb);
}

Even setting margem continues one top of the other, the problem is not margem , and I think it Bellow .

How to add Bellow to CheckBox and it is dynamically generated?

java android

asked by anonymous 10.09.2014 / 15:38

1 answer

Multiple Resource Files in .NET How to get div through another class

score 1 · Accepted Answer

Edit : Since the% c and% that must be above the% c and% is dynamically generated, this solution using% c and% does not answer and causes problems even by adding a self% generated%. Every% of View will need to re-evaluate all the rules, generating an overhead in the solution.

A simple solution would be to adopt a CheckBox with RelativeLayout.BELOW , because with each inserted item the id puts it below the previous one.

The only modification to the current code would be:

for (int i = 0; i < json.length(); i++) {

    // Precisa gerar um LayoutParams para cada View, não recomendo reutilizar.
    LinearLayout.LayoutParams ml = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

    // Margem opcional
    ml.setMargins(0, 5, 0, 0);

    CheckBox cb = new CheckBox(this);
    cb.setLayoutParams(ml);

    _linearLayoutCbIngredientes.addView(cb);
}

To dynamically add margin to a addView you're adding to Layout, you need to:

Create the RelativeLayout of the subclass of the LinearLayout that will add to orientation="vertical" . The LinearLayout constructor receives View and LayoutParams that ViewGroup will have.

Set values before calling View or use LayoutParams .

An example:

RelativeLayout.LayoutParams ml = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

// A classe RelativeLayout.LayoutParams extende MarginLayoutParams,
// verificado na documentacao: http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

ml.setMargins(0, 5, 0, 0);

CheckBox cb = new CheckBox(this);

cb.setChecked(true);

// Ou
cb.setLayoutParams(ml);
_relativeLayout.addView(cb);

// Ou
_relativeLayout.addView(cb, ml);

As a suggestion, why not use a rule to position a layout_width below another?

Using the rule would stay:

RelativeLayout.LayoutParams ml = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

// A classe RelativeLayout.LayoutParams extende MarginLayoutParams,
// verificado na documentacao: http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

// Adiciona uma regra para o CheckBox ficar abaixo da View existente cujo id seja viewAcima.
// Parto do pressuposto que essa View ja esta no layout como mostrado na imagem.

ml.addRule(RelativeLayout.BELOW, R.id.viewAcima);

CheckBox cb = new CheckBox(this);

cb.setChecked(true);

// Ou
cb.setLayoutParams(ml);
_relativeLayout.addView(cb);

// Ou
_relativeLayout.addView(cb, ml);

In this second case, layout_height will add one more restriction where your View should be below addView(View view) .

I believe this form is more correct, because using a fixed margin can generate a problem depending on the density and screen size and etc. of the device. So, it may be that in some devices the fixed margin you gave is not enough to put addView(View view, LayoutParams param) below the other View .