Android common design pattern - singleton

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/u014619545/article/details/90287561

1. hungry Chinese-style

// Only the inner class as static.

public class SingIn{
	//在自己内部定义自己的一个实例，只供内部调用
	private static final SingIn instance = new SingIn();
	private SingIn(){
	}
}

// here it provides a static method for external access to this class, you can directly access

public static SingIn getInstance(){
	return instance;
}

2. lazy style

private volatile static Singleton mSingleton = null;
	private Singleton () {}
	public static Singleton getInstance() {
			if (mSingleton == null) {
				synchronized (Singleton.class) {
						if (mSingleton == null) {
							mSingleton = new Singleton();
						}
				}
			}
	return mSingleton;
}