Saturday, August 8, 2015

How to use RadioGroup onCheckedChanged in Android

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#eee8ff"
    >
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Which is your most favorite?"
        />
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_below="@id/tv"
        android:padding="15dp"
        >
        <RadioButton
            android:id="@+id/rb_coldfusion"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="ColdFusion"
            android:paddingRight="15dp"
            />
        <RadioButton
            android:id="@+id/rb_flex"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Flex"
            android:paddingRight="15dp"
            />
    </RadioGroup>
</RelativeLayout>
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.graphics.Color;
import android.os.Bundle;
import android.app.Activity;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RadioGroup rg = (RadioGroup) findViewById(R.id.rg);
        final RadioButton rb_coldfusion = (RadioButton) findViewById(R.id.rb_coldfusion);
        final RadioButton rb_flex = (RadioButton) findViewById(R.id.rb_flex);

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if(checkedId == R.id.rb_coldfusion){
                    rb_coldfusion.setTextColor(Color.RED);
                    rb_flex.setTextColor(Color.BLACK);
                }
                if (checkedId == R.id.rb_flex){
                    rb_flex.setTextColor(Color.RED);
                    rb_coldfusion.setTextColor(Color.BLACK);
                }
            }
        });
    }
}
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