CODEWITHSUNDEEP
javaandroid
Ali Hassan
Ali Hassan

Reputation: 519

How to create buttons on pressing a button?

I am using following code to create buttons in a horizontal layout using array of button names:

 LinearLayout tabView = (LinearLayout) findViewById(R.id.tabView);
        tabView.setOrientation(LinearLayout.HORIZONTAL);  //Can also be done in xml by android:orientation="vertical"
            for (int i = 0; i < tabButtonNames.length; i++) {
                Button btnTag = new Button(this);
                btnTag.setText(tabButtonNames[i]);
                btnTag.setWidth(50);
                btnTag.setHeight(14);
                btnTag.setTextSize(8);
                btnTag.setId(i);
                btnTag.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View arg0) {
                        ---the code TODO
                });
                tabView.addView(btnTag);
            }

They are created but I cannot change the height and the width of the buttons using setWidth, setHeight or LayoutParam. Then on pressing a button, I want to create a list of more buttons in my vertical layout using an array of button names. I used the same code as above in onClick method, but application crashes on pressing button. Also Button btn=new Button(this) cannot be used in onClick. I have done this in i-Pad app easily,but here I am having trouble.

Upvotes: 0

Views: 180

Answers (3)

vipul mittal
vipul mittal

Reputation: 17401

Just pass the context in new Button() and set layout params instead of height and width

   for (int i = 0; i < tabButtonNames.length; i++) {
                Button btnTag = new Button(<-Context->);//You need to pass context just write <ActivityName>.this
                btnTag.setText(tabButtonNames[i]);
                LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(<width>,<height>);(50,40)


                //btnTag.setWidth(50);
                //btnTag.setHeight(14);
                btnTag.setTextSize(8);
                btnTag.setId(i);
                btnTag.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View arg0) {

                        }



                });
                tabView.addView(btnTag);
                btnTag.setLayoutParams(params)
}

Upvotes: 1

VenomVendor
VenomVendor

Reputation: 15392

Button btn=new Button(this) is actually referring your clicklistiner, you have to refer your class, Button btn=new Button(classname.this) or create a simple function outside clickListener.

Upvotes: 1

SweetWisher ツ
SweetWisher ツ

Reputation: 7306

Use 

Button btn = new Button(getApplicationContext());

OR

Button btn = new Button(ActivityName.this);

instead of 

 Button btn = new Button(this);

As Button requires context. And in OnClick, context of Activity is not accessible.

Upvotes: 6

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