Trying to display text of different sizes on button click in Android app

Question

Once I click the button, I want text of different sizes to be displayed. I tried using the built-in html support for it but I found out that font size tag is not supporI'm using a TextView to do this but I keep getting an error saying "could not execute method of the activity".

Here is my activity main part:

<TextView
    android:id="@+id/header"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="32px" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/rams" 
    android:onClick="ramsShow" />

I have the header string resource in string.xml:

<string name="header">Header</string>

This is the method in my MainActivity that is called when the button is clicked:

public void ramsShow(View view)
{
    TextView test= new TextView(this);
    test = (TextView) findViewById(R.id.header);
    String tmp = "hi";
    test.setText(tmp);
}

What size are you talking about? Do you want different sizes for different screens or just want to change the size?? — Naddy, Dec 17 '13 at 05:19

score 0 · Answer 1 · edited May 23 '17 at 12:15

0

As Ketan suggested you should have:

public void ramsShow(View view)
{
    TextView test = (TextView) findViewById(R.id.header);
    String tmp = "hi";
    test.setText(tmp);
}

To adjust sizes have a look here: How to set text size of textview dynamically for different screens

edited May 23 '17 at 12:15

Community

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answered Dec 17 '13 at 03:37

Gavin

452
4
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score 0 · Answer 2 · edited Dec 17 '13 at 05:51

0

In Activity class, above the onCreate Method, add this line.

TextView test = null;

Within onCreate method, add this code

test = (TextView) findViewById(R.id.header);

Idea is to move the line from ramsShow method to onCreate method.

edited Dec 17 '13 at 05:51

Ketan Ahir

6,458
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answered Dec 17 '13 at 03:38

Prem

4,665
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Thanks ketan ... Initialized null value.hope this fixes it. If missing something else, feel free to edit my answer – Prem Dec 17 '13 at 05:28
removed `final` as you can not reinitialize final variable. – Ketan Ahir Dec 17 '13 at 05:52

score 0 · Answer 3 · answered Dec 10 '15 at 07:05

Within onCreate() write this code...

RelativeLayout lView = new RelativeLayout(this);

            myText = new TextView(this);
            myText.setText(Html.fromHtml("<b><center><font size='3'><font color=\"#145A14\">Welcome standard\n"</font></font></center></b>"));
lView.addView(myText);

setContentView(lView); }

Trying to display text of different sizes on button click in Android app

3 Answers3