{"id":12105,"date":"2014-07-23T16:12:31","date_gmt":"2014-07-23T13:12:31","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=12105"},"modified":"2019-04-24T16:06:23","modified_gmt":"2019-04-24T13:06:23","slug":"android-radiogroup-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/android\/core\/ui\/radiogroup\/android-radiogroup-example\/","title":{"rendered":"Android RadioGroup Example"},"content":{"rendered":"

RadioGroup<\/code><\/a> is a widget in Android which groups RadioButtons<\/code>. More specifically, the use of RadioGroup<\/code> provides the capability of selecting only one RadioButton<\/code> from the set. When the user chooses one RadioButton<\/code>, the previous one that was selected, becomes automatically unchecked.<\/p>\n

In our example we are going to show you the use of RadioGroup<\/code> in the Android apps.<\/p>\n

 
\n 
\n 
\n <\/p>\n

For this tutorial, we will use the following tools in a Windows 64-bit platform:<\/p>\n

    \n
  1. JDK 1.7<\/li>\n
  2. Eclipse 4.2 Juno<\/li>\n
  3. Android SDK 4.1<\/li>\n<\/ol>\n
    Tip<\/strong>
    \nYou may skip project creation and jump directly to the     beginning of the example<\/strong><\/a> below.<\/div>\n

    1. Create a New Android Application Project<\/h2>\n

    Open Eclipse IDE and go to File \u2192 New \u2192 Project \u2192 Android Application Project.<\/p>\n

    Specify the name of the application, the project and the package and then click Next.<\/p>\n

    \"Figure<\/a>
    Figure 1. Create a new Android application<\/figcaption><\/figure><\/p>\n

    In the next window, the \u201cCreate Activity\u201d option should be checked. The new created activity will be the main activity of your project. Then press Next button.<\/p>\n

    \"Figure<\/a>
    Figure 2. Configure the project<\/figcaption><\/figure><\/p>\n

    In \u201cConfigure Launcher Icon\u201d window you should choose the icon you want to have in your app. We will use the default icon of android, so click Next button.<\/p>\n

    \"Figure<\/a>
    Figure 3. Configure the launcher icon<\/figcaption><\/figure><\/p>\n

    Select the \u201cBlank Activity\u201d option and press Next.<\/p>\n

    \"Figure<\/a>
    Figure 4. Create the activity and select its type<\/figcaption><\/figure><\/p>\n

    You have to specify a name for the new Activity and a name for the layout description of your app. The .xml file for the layout will automatically be created in the res\/layout<\/code> folder. Finally, press Finish.<\/p>\n

    \"Figure<\/a>
    Figure 5. Create a new blank activity<\/figcaption><\/figure><\/p>\n

    Now you can see the final structure of the project in the following image.<\/p>\n

    \"Figure<\/a>
    Figure 6. The final structure of the project<\/figcaption><\/figure>
    <\/div> <\/div><\/p>\n

    2. Create the layout of the Main Activity<\/span><\/h2>\n

    Now we are going to create a simple UI that includes of course RadioGroup<\/code>.<\/p>\n

    Open res\/layout\/activity_main.xml<\/code>, go to the respective tab and paste the following code.<\/p>\n

    activity_main.xml:<\/u><\/em><\/p>\n

    <RelativeLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n    xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\n    android:layout_width=\"match_parent\"\n    android:layout_height=\"match_parent\"\n    android:paddingBottom=\"@dimen\/activity_vertical_margin\"\n    android:paddingLeft=\"@dimen\/activity_horizontal_margin\"\n    android:paddingRight=\"@dimen\/activity_horizontal_margin\"\n    android:paddingTop=\"@dimen\/activity_vertical_margin\"\n    tools:context=\".MainActivity\" >\n\n    <TextView\n        android:layout_width=\"wrap_content\"\n        android:layout_height=\"wrap_content\"\n        android:layout_marginBottom=\"10dp\"\n        android:id=\"@+id\/text\"\n        android:text=\"@string\/ChoiceText\" \/>\n    \n    <RadioGroup \n        android:layout_width=\"wrap_content\"\n        android:layout_height=\"wrap_content\"\n        android:layout_below=\"@+id\/text\"\n        android:id=\"@+id\/myRadioGroup\"\n        android:background=\"#abf234\"\n        android:checkedButton=\"@+id\/sound\" >\n        \n        <RadioButton \n            android:layout_width=\"wrap_content\"\n        \tandroid:layout_height=\"wrap_content\"\n        \tandroid:id=\"@+id\/sound\"\n        \tandroid:text=\"@string\/Sound\" \/>\n        \n        <RadioButton \n            android:layout_width=\"wrap_content\"\n        \tandroid:layout_height=\"wrap_content\"\n        \tandroid:id=\"@+id\/vibration\"\n        \tandroid:text=\"@string\/Vibration\" \/>\n        \n        <RadioButton \n            android:layout_width=\"wrap_content\"\n        \tandroid:layout_height=\"wrap_content\"\n        \tandroid:id=\"@+id\/silent\"\n        \tandroid:text=\"@string\/Silent\" \/>\n        \n    <\/RadioGroup>\n    \n    <Button \n        android:layout_width=\"wrap_content\"\n        android:layout_height=\"wrap_content\"\n        android:layout_below=\"@+id\/myRadioGroup\"\n        android:layout_marginTop=\"10dp\"\n        android:id=\"@+id\/chooseBtn\"\n        android:text=\"@string\/Choose\" \/>\n\n<\/RelativeLayout>\n<\/pre>\n
    The basic attribute of RadioGroup<\/code> is android:checkedButton<\/code><\/a>, that specifies which radio button should be checked by default. The other components are inherited from the View<\/code> class. As you can notice from the code above, the set of the radio buttons are embodied by a RadioGroup<\/code>, so every configuration of its component affects the radio buttons too.<\/p>\n
    3. Set the string values<\/h2>\n
    At this step we just going to declare the string references from the activity_main.xml<\/code> to the appropriate resource.<\/p>\n
    So open res\/values\/strings.xml<\/code>, go to the respective tab and paste the following code.<\/p>\n
    strings.xml<\/u><\/em><\/p>\n
    <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<resources>\n\n    <string name=\"app_name\">RadioGroupExample<\/string>\n    <string name=\"action_settings\">Settings<\/string>\n    <string name=\"ChoiceText\">Choose one of the radio buttons below<\/string>\n    <string name=\"Sound\">Sound<\/string>\n    <string name=\"Vibration\">Vibration<\/string>\n    <string name=\"Silent\">Silent<\/string>\n    <string name=\"Choose\">Choose<\/string>\n\n<\/resources>\n<\/pre>\n
    4. Code the Main Activity<\/h2>\n
    At this point we will show how we can handle the change of a radio button, that belongs to a RadioGroup<\/code>.<\/p>\n
    Open src\/com.javacodegeeks.android.radiogroupexample\/MainActivity.java<\/code> and paste the following code.<\/p>\n
    MainActivity.java:<\/u><\/em><\/p>\n
    package com.javacodegeeks.android.radiogroupexample;\n\nimport android.os.Bundle;\nimport android.app.Activity;\nimport android.view.View;\nimport android.view.View.OnClickListener;\nimport android.widget.Button;\nimport android.widget.RadioButton;\nimport android.widget.RadioGroup;\nimport android.widget.RadioGroup.OnCheckedChangeListener;\nimport android.widget.TextView;\nimport android.widget.Toast;\n\npublic class MainActivity extends Activity {\n\t\n\tprivate RadioGroup radioGroup;\n\tprivate RadioButton sound, vibration, silent; \n\tprivate Button button;\n\tprivate TextView textView;\n\n\t@Override\n\tprotected void onCreate(Bundle savedInstanceState) {\n\t\tsuper.onCreate(savedInstanceState);\n\t\tsetContentView(R.layout.activity_main);\n\t\t\n\t\tradioGroup = (RadioGroup) findViewById(R.id.myRadioGroup);\n\t\t\n\t\tradioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {\n\n\t\t\t@Override\n\t\t\tpublic void onCheckedChanged(RadioGroup group, int checkedId) {\n\t\t\t\t\/\/ find which radio button is selected\n\t\t\t\tif(checkedId == R.id.silent) {\n\t\t\t\t\tToast.makeText(getApplicationContext(), \"choice: Silent\", \n\t\t\t\t\t\t\tToast.LENGTH_SHORT).show();\n\t\t\t\t} else if(checkedId == R.id.sound) {\n\t\t\t\t\tToast.makeText(getApplicationContext(), \"choice: Sound\", \n\t\t\t\t\t\t\tToast.LENGTH_SHORT).show();\n\t\t\t\t} else {\n\t\t\t\t\tToast.makeText(getApplicationContext(), \"choice: Vibration\", \n\t\t\t\t\t\t\tToast.LENGTH_SHORT).show();\n\t\t\t\t}\n\t\t\t}\n\t\t\t\n\t\t});\n\t\t\n\t\tsound = (RadioButton) findViewById(R.id.sound);\n\t\tvibration = (RadioButton) findViewById(R.id.vibration);\n\t    silent = (RadioButton) findViewById(R.id.silent);\n\t    textView = (TextView) findViewById(R.id.text);\n\t    \n\t    button = (Button)findViewById(R.id.chooseBtn);\n\t    button.setOnClickListener(new OnClickListener() {\n\t\t\t\n\t\t\t@Override\n\t\t\tpublic void onClick(View v) {\n\t\t\t\tint selectedId = radioGroup.getCheckedRadioButtonId();\n\t\t\t\t\n\t\t\t\t\/\/ find which radioButton is checked by id\n\t\t\t\tif(selectedId == sound.getId()) {\n\t\t\t\t\ttextView.setText(\"You chose 'Sound' option\");\n\t\t\t\t} else if(selectedId == vibration.getId()) {\n\t\t\t\t\ttextView.setText(\"You chose 'Vibration' option\");\n\t\t\t\t} else {\n\t\t\t\t\ttextView.setText(\"You chose 'Silent' option\");\n\t\t\t\t}\t\n\t\t\t}\n\t    });\n\t}\n\n}\n<\/pre>\n
    Now let’s have a look at the code above. When a checked radio button is changed in its group, OnCheckedChangeListener<\/code><\/a> is invoked in order to handle this situation. The onCheckedChanged()<\/code> method of this interface, includes the unique id of the radio button that was selected and caused the invoke of the callback.[ulp id=’Ja8Orb5oPKdShcXt’]<\/p>\n
    In this example we will show you another way of selecting the choice information (for example when a button is pressed).  This can be done through getCheckedRadioButtonId()<\/code><\/a>, which is a public function of RadioGroup<\/code> class. This method returns the unique id of the radio button that is chosen from the group. You can have a look at the code to see how you can handle both situations.<\/p>\n
    Of course Android system provides us a more dynamic way of changing and handling the attributes of the application views. As a prerequisite is to map every view with the unique id component of the XML. This can be done via findViewById()<\/code> method.<\/p>\n
    5. Run the application<\/h2>\n
    To run our application, right click on our project \u2192 Run as \u2192 Android Application. The AVD will appear with the app loaded.<\/p>\n
    \"Figure<\/a>
    Figure 7: The Android app is loaded<\/figcaption><\/figure><\/p>\n
    As you can see, the radio button \u2013 “Sound” is selected as default because we declared it through its id to the android:checkedButton<\/code> attribute at the layout of the activity.<\/p>\n
    Now let’s choose another radio button, for example “Vibration”. A Toast<\/code> is displayed on the screen because the callback method of the OnCheckedChangeListener<\/code> is initialized.<\/p>\n
    \"Figure<\/a>
    Figure 8: Selection of another radio button<\/figcaption><\/figure><\/p>\n
    Now let’s select “Silent” radio button and after the disappearance of the Toast<\/code> press “Choose” button. The TextView<\/code> at the top of the screen changes to indicate our choice, as you can see in the next image. This is happening because  getCheckedRadioButtonId()<\/code>  is called  and a simple procedure is done inside the onClick()<\/code> operation of the OnClickListener<\/code> interface, as you can see in the MainActivity.java<\/code>.<\/p>\n
    \"Figure<\/a>
    Figure 9: Press the “Choose” button after selecting another radio button<\/figcaption><\/figure><\/p>\n
    Download the Eclipse Project<\/h2>\n
    This was an example of RadioGroup in Android.<\/p>\n
    Download<\/strong>
    \nYou can download the full source code of this example here :     RadioGroupExample.zip<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
    RadioGroup is a widget in Android which groups RadioButtons. More specifically, the use of RadioGroup provides the capability of selecting only one RadioButton from the set. When the user chooses one RadioButton, the previous one that was selected, becomes automatically unchecked. In our example we are going to show you the use of RadioGroup in …<\/p>\n","protected":false},"author":11,"featured_media":1202,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[330],"tags":[629,1120],"class_list":["post-12105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-radiogroup","tag-oncheckedchangelistener","tag-radiobutton"],"yoast_head":"\nAndroid RadioGroup Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"RadioGroup is a widget in Android which groups RadioButtons. 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