How to create buttons on pressing a button?

Question

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.

Answer 1

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.

Answer 2

Button btn=new Button(this)实际上是指您的clicklistiner，您必须引用您的class, Button btn=new Button(classname.this)或在clickListener之外创建一个简单函数。

Answer 3

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)
}