How to hide/remove circle from RadioButton 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="10dp"     tools:context=".MainActivity"     android:background="#d9ffd2"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Which is your most favorite?"         />     <RadioGroup         android:id="@+id/rg"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="vertical"         android:layout_below="@id/tv"         android:padding="15dp"         >         <RadioButton             android:id="@+id/rb_coldfusion"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="ColdFusion"             android:paddingRight="15dp"             android:button="@null"             />         <RadioButton             android:id="@+id/rb_flex"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Flex"             android:paddingRight="15dp"             android:button="@null"             />     </RadioGroup> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; import android.os.Bundle; import android.app.Activity; import android.widget.RadioButton; import android.widget.RadioGroup;  public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          simpulan RadioGroup rg = (RadioGroup) findViewById(R.id.rg);         simpulan RadioButton rb_coldfusion = (RadioButton) findViewById(R.id.rb_coldfusion);         simpulan RadioButton rb_flex = (RadioButton) findViewById(R.id.rb_flex);          rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {             @Override             public void onCheckedChanged(RadioGroup group, int checkedId) {                 if (rb_coldfusion.isChecked()) {                     rb_coldfusion.setTextColor(Color.RED);                     rb_flex.setTextColor(Color.BLACK);                 }                 if (rb_flex.isChecked()){                     rb_flex.setTextColor(Color.RED);                     rb_coldfusion.setTextColor(Color.BLACK);                 }             }         });    } }
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