介绍 public static String getSyncBusiness (final String url) {
,,,try {
,,,,,FutureTask, task =, new FutureTask (new Callable< String> (), {
,,,,,,@Override
,,,,,,,public String 叫(),throws Exception {
,,,,,,,,,URL u =, new URL(网址);
,,,,,,,,,HttpURLConnection connection =, (HttpURLConnection), u.openConnection ();
,,,,,,,,,connection.setDoInput(真正的);
,,,,,,,,,connection.setRequestMethod (“GET");
,,,,,,,,,connection.connect ();
,,,,,,,,,InputStream 拷贝=,connection.getInputStream ();
,,,,,,,,,BufferedReader br =, new BufferedReader (new InputStreamReader (,,“utf8"));
,,,,,,,,,final StringBuilder sb =, new StringBuilder ();
,,,,,,,,,String line =,空;
,,,,,,,,,,((=line br.readLine ()) !=null) {
,,,,,,,,,,,sb.append(线);
,,,,,,,,,}
,,,,,,,,,return sb.toString ();
,,,,,,,}
,,,,,});
,,,,,new 线程(任务).start ();
,,,,,return task.get ();
,,,},catch (Exception e), {
,,,,,e.printStackTrace ();
,,,,,throw new RuntimeException(“网络访问错误“);
,,,}
} public static String getSyncBusiness2 (final String url) {
,,,try {
,,,,,Callable, callable =, new Callable (), {
,,,,,,@Override
,,,,,,,public String 叫(),throws Exception {
,,,,,,,,,URL u =, new URL(网址);
,,,,,,,,,HttpURLConnection connection =, (HttpURLConnection), u.openConnection ();
,,,,,,,,,connection.setDoInput(真正的);
,,,,,,,,,connection.setRequestMethod (“GET");
,,,,,,,,,connection.connect ();
,,,,,,,,,InputStream 拷贝=,connection.getInputStream ();
,,,,,,,,,BufferedReader br =, new BufferedReader (new InputStreamReader (,,“utf8"));
,,,,,,,,,final StringBuilder sb =, new StringBuilder ();
,,,,,,,,,String line =,空;
,,,,,,,,,,((=line br.readLine ()) !=null) {
,,,,,,,,,,,sb.append(线);
,,,,,,,,,}
,,,,,,,,,return sb.toString ();
,,,,,,,}
,,,,,};
,,,,,ExecutorService exec =, Executors.newFixedThreadPool (1);
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怎么在Android中将异步方法以同步方式实现?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
FutureTask接口是一个泛型接口,可以设置需要返回的类型,并且可以看出该方法为了方便程序员的操作,巧妙的通过抛出一个总异常来保证方法统一执行统一判断,类似于RxJava的异常机制,并且通过源码可以看的出,该接口实现了<强> RunnableFuture<在接口,而<强> RunnableFuture 接口又继承于<强> Runnable 这也就解释了为什么可以直接在新线程中传入任务对象。
可以理解为FuturTask通过实现可运行对子线程进行驱动,进行异步的网络请求等操作,<强>但是并没有进行异步并发操作,而是同时阻塞了UI线程,直到该子线程执行完毕。
除了以上还可以直接使用<强>调用接口,需要注意,可调用的需要线程池<强> ExecutorService 强才可以进行驱动。
