repositories{

mavenCentral()

}

dependencies {

 compile ('com.google.android.gms:play-services-maps:10.0.1')

}

按以上配置，運行clean時報錯，無法加載play-services-maps 10.0.1包。
點擊Android Studio的提示如何修復的鏈接，就會自動下載Google的相關依賴包到本地。下載時彈出窗口中顯示的一些信息如下。

Install Missing Componets
SDK Path:/User/you/Library/Android/sdk
http://stackoverflow.com/questions/16978190/add-google-maps-api-v2-in-a-fragment
http://www.joellipman.com/articles/google/android/application-development/android-os-add-googlemap-as-fragment.html
https://www.zhihu.com/question/20892245
http://blog.csdn.net/woshilisao/article/details/8647649 android fragment（android.support.v4.app.Fragment和android.app.Fragment區別）
http://www.tuicool.com/articles/YFBv6nJ Introduction to Google Maps API for Android

1.public boolean shouldOverrideUrlLoading(WebView view, String url) { 
       view.loadUrl(url);
       return true;
  }
重寫shouldOverrideUrlLoading方法，返回true表示點擊鏈接是在當前webview里打開，而不是調用瀏覽器打開


WebViewClient與WebChromeClient的區別 http://blog.csdn.net/jackyhuangch/article/details/8310033

1. Android Studio2.2在mac下啟動報錯
找不到原因，改為使用Android Studio 2.1.3
下載地址：http://tools.android.com/download/studio/builds/2-1-3

2. 編譯某項目報錯Could not find property 'config' on SigningConfig container
在build.grade文件的android->signingConfigs節點下增加config配置
    }
...

3. 編譯報錯failed to find target android-22
修改build.grade文件的相關屬性：

參考dubbo里的NetUtils類

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.regex.Pattern;

public class GetIP {
public static void main(String[] args) {
System.out.println(GetIP.getLocalAddress0().getHostAddress());
}
public static InetAddress getLocalAddress0() {
??????? InetAddress localAddress = null;
??????? try {
??????????? localAddress = InetAddress.getLocalHost();
??????????? if (isValidAddress(localAddress)) {
??????????????? return localAddress;
??????????? }
??????? } catch (Throwable e) {
??????????? System.out.println("Failed to retriving ip address, " + e.getMessage());
??????? }
??????? try {
??????????? Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
??????????? if (interfaces != null) {
??????????????? while (interfaces.hasMoreElements()) {
??????????????????? try {
??????????????????????? NetworkInterface network = interfaces.nextElement();
??????????????????????? Enumeration<InetAddress> addresses = network.getInetAddresses();
??????????????????????? if (addresses != null) {
??????????????????????????? while (addresses.hasMoreElements()) {
??????????????????????????????? try {
??????????????????????????????????? InetAddress address = addresses.nextElement();
??????????????????????????????????? if (isValidAddress(address)) {
??????????????????????????????????????? return address;
??????????????????????????????????? }
??????????????????????????????? } catch (Throwable e) {
??????????????????????????????????? System.out.println("Failed to retriving ip address, " + e.getMessage());
??????????????????????????????? }
??????????????????????????? }
??????????????????????? }
??????????????????? } catch (Throwable e) {
??????????????????????? System.out.println("Failed to retriving ip address, " + e.getMessage());
??????????????????? }
??????????????? }
??????????? }
??????? } catch (Throwable e) {
??????????? System.out.println("Failed to retriving ip address, " + e.getMessage());
??????? }
??????? System.out.println("Could not get local host ip address, will use 127.0.0.1 instead.");
??????? return localAddress;
??? }
??? private static boolean isValidAddress(InetAddress address) {
??????? if (address == null || address.isLoopbackAddress())
??????????? return false;
??????? String name = address.getHostAddress();
??????? return (name != null
??????????????? && ! ANYHOST.equals(name)
??????????????? && ! LOCALHOST.equals(name)
??????????????? && IP_PATTERN.matcher(name).matches());
??? }
?? ?
??? public static final String LOCALHOST = "127.0.0.1";

??? public static final String ANYHOST = "0.0.0.0";
?? ?
??? private static final Pattern IP_PATTERN = Pattern.compile("\\d{1,3}(\\.\\d{1,3}){3,5}$");
}

CountDownLatch : 一個線程(或者多個)， 等待另外N個線程完成某個事情之后才能執行。? ?
CyclicBarrier? : N個線程相互等待，任何一個線程完成之前，所有的線程都必須等待。
這樣應該就清楚一點了，對于CountDownLatch來說，重點是那個“一個線程”, 是它在等待， 而另外那N的線程在把“某個事情”做完之后可以繼續等待，可以終止。而對于CyclicBarrier來說，重點是那N個線程，他們之間任何一個沒有完成，所有的線程都必須等待。

CyclicBarrier 在釋放等待線程后可以重用，所以稱它為循環的 barrier。它 還支持一個可選的 Runnable 命令，在一組線程中的最后一個線程到達之后（但在釋放所有線程之前），該命令只在每個屏障點運行一次。若在繼續所有參與線程之前更新共享狀態，此屏障操作很有用。



public class Test {
??? public static void main(String[] args) {
??????? new Test().test1();
??? }
?? ?
??? public void test1() {
??????? CyclicBarrier cyclicBarrier = new CyclicBarrier(4, new Runnable() {
??????????? @Override
??????????? public void run() {
??????????????? System.out.println("所有玩家進入第二關！");
??????????? }
??????? });

??????? for (int i = 0; i < 4; i++) {
??????????? new Thread(new Player(i, cyclicBarrier)).start();
??????? }
??? }

??? class Player implements Runnable {
??????? private CyclicBarrier cyclicBarrier;
??????? private int id;

??????? public Player(int id, CyclicBarrier cyclicBarrier) {
??????????? this.cyclicBarrier = cyclicBarrier;
??????????? this.id = id;
??????? }

??????? @Override
??????? public void run() {
??????????? try {
??????????????? System.out.println("玩家" + id + "正在玩第一關...");
??????????????? cyclicBarrier.await();
??????????????? System.out.println("玩家" + id + "進入第二關...");
??????????? } catch (InterruptedException e) {
??????????????? e.printStackTrace();
??????????? } catch (BrokenBarrierException e) {
??????????????? e.printStackTrace();
??????????? }
??????? }
??? }
}