Java tutorial
//package com.java2s; //License from project: Apache License import android.content.Intent; public class Main { public static double getDoubleExtra(Intent intent, String name, double defaultValue) { if (!hasIntent(intent) || !hasExtra(intent, name)) return defaultValue; return intent.getDoubleExtra(name, defaultValue); } public static boolean hasIntent(Intent intent) { return intent != null; } public static boolean hasExtra(Intent intent, String key) { return intent.hasExtra(key); } }