Complete list of all new features of Android 4.1 Jelly Bean

Android 4.1, Jelly Bean, is the fastest and smoothest version of Android yet. Jelly Bean improves on the simplicity and beauty of Android 4.0, and introduces a new Google search experience on Android.

• Everything in Jelly Bean feels fast, fluid, and smooth. Moving between home screens and switching between apps is effortless, like turning pages in a book.
• Jelly Bean features improved performance throughout the system, including faster orientation changes, faster responses when switching between recent apps, and smoother and more consistent rendering across the system through vsync and triple buffering.
• Jelly Bean has more reactive and uniform touch responses, and makes your device even more responsive by boosting your device's CPU instantly when you touch the screen, and turns it down when you don't need it to improve battery life.

To read what's new in Android 4.1 Jelly Bean, visit: http://www.android.com/about/jelly-bean/.

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Implement grouped CheckBox on Action Menu

Example of Action Menu with grouped CheckBox.

Create /res/menu/activity_main.xml to define action menu.

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_settings"
        android:title="@string/menu_settings"
        android:orderInCategory="100"
        android:showAsAction="never" />
    <group android:checkableBehavior="single">
        <item android:id="@+id/selecta"
              android:title="Selection A" android:checked="true"/>
        <item android:id="@+id/selectb"
              android:title="Selection B" />
        <item android:id="@+id/selectc"
              android:title="Selection C" />
    </group>
</menu>

The checked status will not be updated automatically. We can change it in onOptionsItemSelected() callback method.

package com.example.androidactionbar;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  switch (item.getItemId()) {
        case R.id.selecta:
         item.setChecked(true);
         Toast.makeText(getApplicationContext(), 
           "A Selected", 
           Toast.LENGTH_LONG).show();
         return true;
        case R.id.selectb:
         item.setChecked(true);
         Toast.makeText(getApplicationContext(), 
           "B Selected", 
           Toast.LENGTH_LONG).show();
         return true;
        case R.id.selectc:
         item.setChecked(true);
         Toast.makeText(getApplicationContext(), 
           "C Selected", 
           Toast.LENGTH_LONG).show();
         return true;
        default:
            return super.onOptionsItemSelected(item);    
  }
 }

}

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