How to set a radio button in Android

Question

I have an app that uses radio buttons  The default for this button is set in the main xml file  ie    android id    id rb sat1E  android checked  true    In the Java file I have   final RadioButton radio1    RadioButton findViewById R id rb sat1E     I have also created a  Reset  button in the main Java file and can use the following code to reset TextView information ie   pos1 deg setText  0 0      But how do I reset a radio button  I would have thought it to be something like  radio1 setBoolean  TRUE      But that does not work at all   Any help greatly appreciated  Thanks

User · Answer

Use this code       RadioButton findViewById R id radio3   setChecked true    mistake - gt  don t forget to give    for whole before setChecked   - gt  If u forget to do that setChecked   is not available for this radio button

User · Answer

if you have done the design in XML and want to show one of the checkbox in the group as checked when loading the page below solutions can help you       lt RadioGroup         android layout width  wrap content          android layout height  wrap content          android layout below    id txtLastNameSignUp          android layout margin  20dp          android orientation  horizontal          android id    id radioGroup  gt   lt RadioButton     android layout width  wrap content      android layout height  wrap content      android checked  true      android id    id Male      android text  Male   gt           lt RadioButton             android layout width  wrap content              android layout height  wrap content              android id    id Female              android text  Female   gt           lt  RadioGroup gt

User · Answer

Just to clarify this  if we have a RadioGroup with several RadioButtons and need to activate one by index  implies that    radioGroup check R id radioButtonId    and   radioGroup getChildAt index     We can to do   radioGroup check radioGroup getChildAt index  getId

User · Answer

Many times if your radio buttons belong to the same radioGroup then  radioButton setChecked true   will not select the radio button properly  So to solve this problem try using your radioGroup   radioGroup check R id radioButtonId

User · Answer

If you want to do it in code  you can call the check member of RadioGroup   radioGroup check R id radioButtonId     This will check the button you specify and uncheck the others

User · Answer

Or you can do it in the XML file    In the RadioGroup using   android checkedButton  id button to check   or in the RadioButton   android checked  true

User · Answer

For radioButton use   radio1 setChecked true     It does not make sense to have just one RadioButton  If you have more of them you need to uncheck others through  radio2 setChecked false         If your setting is just on off use CheckBox

User · Answer

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

User · Answer

I have multiple RadioButtons without Group and setChecked true  works  but setChecked false  don t works  But this code works   RadioButton switcher    RadioButton  view findViewById R id active                           switcher setOnClickListener new RadioButton OnClickListener                                 Override                             public void onClick View v                                    if   RadioButton v  isSelected                                           RadioButton v  setChecked false                                         RadioButton v  setSelected false                                     else                                         RadioButton v  setChecked true                                         RadioButton v  setSelected true

[android] How to set a radio button in Android

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