Radio Buttons: Java Source Code

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import android.widget.RadioButton;

A radio button is a two-states button that can be either checked or unchecked.

import android.widget.RadioGroup;

This class is used to create a multiple-exclusion scope for a set of radio buttons. Checking one radio button that belongs to a radio group unchecks any previously checked radio button within the same group.

import android.widget.Toast;

A toast is a view containing a quick little message for the user. When the view is shown to the user, appears as a floating view over the application.

int selectedId = radioSexGroup.getCheckedRadioButtonId( );

Return the identifier of the selected radio button in this group.

Toast.makeText( MainActivity.this,
      radioSexButton.getText( ), Toast.LENGTH_LONG ).show( );

Make a standard toast that just contains a text view with the text from a resource.

Selecting Female & pushing DISPLAY ⇒

MyApplication/app/src/main/java/com/example/wenchen/myapplication/MainActivity.java

view source print? 01 package com.example.wenchen.myapplication; 02   03 import android.app.Activity; 04 import android.os.Bundle; 05 import android.view.View; 06 import android.view.View.OnClickListener; 07 import android.widget.Button; 08 import android.widget.RadioButton; 09 import android.widget.RadioGroup; 10 import android.widget.Toast; 11   12 public class MainActivity extends Activity { 13   private RadioGroup  radioSexGroup; 14   private RadioButton radioSexButton; 15   private Button      btnDisplay; 16   17   @Override 18   public void onCreate( Bundle savedInstanceState ) { 19     super.onCreate( savedInstanceState ); 20     setContentView( R.layout.activity_main ); 21     addListenerOnButton( ); 22   } 23   24   public void addListenerOnButton( ) { 25     radioSexGroup = (RadioGroup) findViewById( R.id.radioSex ); 26     btnDisplay    = (Button)     findViewById( R.id.btnDisplay ); 27     btnDisplay.setOnClickListener( new OnClickListener( ) { 28       @Override 29       public void onClick( View v ) { 30         // Get selected radio button from radioGroup. 31         int selectedId = radioSexGroup.getCheckedRadioButtonId( ); 32         // Find the radiobutton by returned id. 33         radioSexButton = (RadioButton) findViewById( selectedId ); 34         Toast.makeText( MainActivity.this, 35           radioSexButton.getText( ), Toast.LENGTH_LONG ).show( ); 36       } 37     }); 38   } 39 }