Android : Android Buttons in Code same size

I want to add buttons dynamically and to have them same sizes. Buttons count depends on length of a word. It looks quite allright when I have long word:

http://i.stack.imgur.com/zZ3FS.jpg

But when I have only 1 letter as a word it looks like this:

http://i.stack.imgur.com/IyYhd.jpg

This is my code:

 public void loadButtons() {
    buttonsLayout = (LinearLayout) findViewById(R.id.buttons_Layout);
    answerButtons = new Button[word.length()];


    for (int i = 0; i < word.length(); i++) {
        answerButtons[i] = new Button(this);
        answerButtons[i].setText(null);
        LinearLayout.LayoutParams Params1 = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT,1f); 
        answerButtons[i].setLayoutParams(Params1);


        answerButtons[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
        buttonsLayout.addView(answerButtons[i]);
    }

How could I achieve that? :) Thanks