Change TextView size using a SeekBar

Question

It works well when I try to Change text size in (EditText) by putting a constant value in code <<<<

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    EditText Text = (EditText)findViewById(R.id.editText);
    SeekBar f = (SeekBar)findViewById(R.id.seekBar);

    Text.setTextSize(55);

    Text.setText("Hello");



}

But I Can't get it to work by using SeekBar:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    EditText Text = (EditText)findViewById(R.id.editText);
    SeekBar f = (SeekBar)findViewById(R.id.seekBar);

    Text.setTextSize((float)f.getProgress());

    Text.setText("Hello");



}

Answer 1

You can change the text size using this listener:

f.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {       

    @Override       
    public void onStopTrackingTouch(SeekBar seekBar) {      
        // TODO Auto-generated method stub      
    }       

    @Override       
    public void onStartTrackingTouch(SeekBar seekBar) {     
        // TODO Auto-generated method stub      
    }       

    @Override       
    public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {     
        // TODO Auto-generated method stub      

        Text.setTextSize(progress);

    }