{"id":76996,"date":"2020-03-16T11:44:09","date_gmt":"2020-03-16T06:14:09","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=76996"},"modified":"2021-02-25T16:06:26","modified_gmt":"2021-02-25T10:36:26","slug":"android-radiobutton","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/android-radiobutton\/","title":{"rendered":"Android RadioButton, RadioGroup, and CheckBox – A Complete Guide"},"content":{"rendered":"

In this tutorial, we will learn about the concept of Android RadioButton, RadioGroup, and Android checkbox<\/strong> with their implementation.<\/p>\n

Introduction to Android RadioButton<\/h2>\n

Beginning with Android RadioButton<\/strong>, A RadioButton is a button that has two states, that are either check or uncheck. This means if we click on a RadioButton it gets into Checked state and by default, it comes in Unchecked State.<\/p>\n

In the Android Radio button, one thing to be noted is, once it gets into the checked state we cannot undo it. Generally, we use them in our application to let the users select one option from a set of options.\u00a0Radio Button is one of the important Android UI controls, as it provides an interactive User Interface for the users.<\/p>\n

Learn to use UI controls<\/a> to create an attractive design for your application.<\/em><\/strong><\/p>\n

To create it, we define it in our layout file as:<\/p>\n

<RadioButton\r\n      android: text= \u201cI am a button\u201d\r\n      android: id= \u201c@+id\/rdb\u201d\r\n      \/\/ other attributes\r\n><\/pre>\n
Attributes of Android RadioButton<\/h3>\n
Some of the attributes that we can use to customize the RadioButton in Android are as follows:<\/p>\n
    \n
  1. android: id –<\/strong>\u00a0It set a unique identity.<\/li>\n
  2. android: checked –<\/strong> It specifies the current state of the button.<\/li>\n
  3. android: gravity –<\/strong> It sets the alignment of the text.<\/li>\n
  4. android: text –<\/strong> It sets the text for the Radio Button.<\/li>\n
  5. android:textColor –<\/strong> It sets the color of the text.<\/li>\n
  6. android:textSize –<\/strong> It sets the size of the text.<\/li>\n
  7. android:textStyle –<\/strong> It sets the style of the text, like – bold, italics.<\/li>\n
  8. android: background –<\/strong> It sets the color for the background of the button.<\/li>\n
  9. android: padding –<\/strong> It sets the padding from left, right bottom or the top.<\/li>\n
  10. android:onClick –<\/strong> It invokes the method onClick() when the button is clicked.<\/li>\n
  11. android: visibility –<\/strong> It controls the visibility of the Radio Button.<\/li>\n<\/ol>\n
    RadioGroup in Android<\/h3>\n
    Radio Group in Android is a group that contains a set of radio buttons. They contain Radio buttons in a group or in separate groups according to the requirement. The specialty of a Radio group is, among all the available Radio buttons inside it, only one can be chosen. After selecting a Radio button if we select some other Radio button, then the previous one gets deselected.<\/p>\n
    Their need is basically to select one right option among all the other available options. For example, Multiple Choice Questions.<\/p>\n
    To define it in our layout file, we will write the following:<\/p>\n
    <RadioGroup\r\n      android:layout_width=\"fill_parent\"\r\n      android:layout_height=\"90dp\">\r\n\r\n      <RadioButton\r\n         android:id=\"@+id\/rdb\"\r\n         android:layout_width=\"wrap_content\"\r\n         android:layout_height=\"55dp\"\r\n         android:text=\"RadioButton1\"\r\n         android:textSize=\"25dp\" \/>\r\n\r\n      <RadioButton\r\n         android:id=\"@+id\/rdb1\"\r\n         android:layout_width=\"wrap_content\"\r\n         android:layout_height=\"wrap_content\"\r\n         android:text=\"RadioButton2\"\r\n         android:textSize=\"25dp\" \/>\r\n   <\/RadioGroup><\/pre>\n
    CheckBox in Android<\/h3>\n
    CheckBox is also a two-state button, it can have either checked state or unchecked state. The major difference between Android CheckBox and Android RadioButton is that checkboxes can be unchecked manually.<\/p>\n