In Android, you can use “android.widget.RadioButton” class to render radio button, and those radio buttons are usually grouped by
android.widget.RadioGroup. If RadioButtons are in group, when one RadioButton within a group is selected, all others are automatically deselected.
Open “your.xml” file, just add “RadioGroup”, “RadioButton” and a button, inside the LinearLayout.
<!--?xml version= "1.0" encoding= "utf-8" ?--> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" android:layout_width= "fill_parent" android:layout_height= "fill_parent" android:orientation= "vertical" > <radiogroup android:id= "@+id/radioSex" android:layout_width= "wrap_content" android:layout_height= "wrap_content" > <radiobutton android:id= "@+id/radioMale" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "@string/radio_male" android:checked= "true" > <radiobutton android:id= "@+id/radioFemale" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "@string/radio_female" > </radiobutton></radiobutton></radiogroup> <button android:id= "@+id/btnDisplay" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "@string/btn_display" > //To make a radio button is selected by default, put android:checked="true" within the RadioButton element. // In this case, radio option "Male" is selected by default.</button></linearlayout> |
Inside activity “onCreate()” method, attach a click listener on button.
public class MainActivity extends Activity { private RadioGroup radioSexGroup; private RadioButton radioSexButton; private Button btnDisplay; @Override public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.main); addListenerOnButton(); } public void addListenerOnButton() { radioSexGroup = (RadioGroup) findViewById(R.id.radioSex); btnDisplay = (Button) findViewById(R.id.btnDisplay); btnDisplay.setOnClickListener( new OnClickListener() { @Override public void onClick(View v) { // get selected radio button from radioGroup int selectedId = radioSexGroup.getCheckedRadioButtonId(); // find the radiobutton by returned id radioSexButton = (RadioButton) findViewById(selectedId); Toast.makeText(MyAndroidAppActivity. this , radioSexButton.getText(), Toast.LENGTH_SHORT).show(); } }); } } |