How to set TextView font size programmatically in Android

activity_main.xml

 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="@android:color/white"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Sample TextView..."         android:background="#ffd1fcff"         android:padding="25dp"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Set TextView Font Size"         android:layout_below="@id/tv"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.util.TypedValue; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView;  public class MainActivity extends Activity{      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         tanggapan TextView tv = (TextView) findViewById(R.id.tv);         Button btn = (Button) findViewById(R.id.btn);          // Set a click listener for Button widget         btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Set TextView font/text size to 25 dp                 tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 25);                  // Set TextView font/text size to 25 sp                 //tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 25);                  // Set TextView font/text size to 25 pixels                 //tv.setTextSize(TypedValue.COMPLEX_UNIT_PX, 25);                  // Set TextView font/text size to 25 points                 //tv.setTextSize(TypedValue.COMPLEX_UNIT_PT, 25);             }         });     } } 

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