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I am trying to create a an android app with multiple textviews that when clicked can change a property of the textview such as font size. I wanted to know if there was a way to do this with one onclick method and only one onclick listener. I have the android:onClick="Click" set to a click function for all the text views.

Ahad Memon
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  • To answer your question keep a list of all your TextViews and update them in your `Click()` method. However, if you only want to change a cosmetic trait like using a larger font size for your entire app, you should use Themes. – Sam Jan 22 '18 at 23:01
  • I meant changing the font size of just the textview that was clicked. I know there is a generic way of doing this using the view that is passed into to the click method. I just don't know how. – Ahad Memon Jan 22 '18 at 23:05

2 Answers2

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You will have to add android:onClick="onClick" to all textviews Then in your activity 

   public class MainActivity extends AppCompatActivity {

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

   public void onClick(View view) {
       if (view instanceOf TextView) {
           ((TextView)view).setTextSize(14);
       }
   }
}
MoGa
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changing the font size of just the textview that was clicked

See setTextSize():

public void Click(View v) {
    ((TextView) v).setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16); 
}

Be wary of using getTextSize() to set the new text size: TextView.setTextSize behaves abnormally - How to set text size of textview dynamically for different screens

Sam
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