android studio 主线程中访问网络，遇到android.os.NetworkOnMainThreadException

在android studio中访问网络的时候遇到了如下错误：

08-03 13:22:45.701 9065-9065/com.vrphogame.thyroidapp0802 E/AndroidRuntime: FATAL EXCEPTION: main

  Process: com.vrphogame.thyroidapp0802, PID: 9065  android.os.NetworkOnMainThreadException  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)  at libcore.io.IoBridge.connectErrno(IoBridge.java:154)  at libcore.io.IoBridge.connect(IoBridge.java:122)  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)  at java.net.Socket.connect(Socket.java:884)  at com.android.okhttp.internal.Platform.connectSocket(Platform.java:117)  at com.android.okhttp.internal.http.SocketConnector.connectRawSocket(SocketConnector.java:160)  at com.android.okhttp.internal.http.SocketConnector.connectCleartext(SocketConnector.java:67)  at com.android.okhttp.Connection.connect(Connection.java:152)  at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:185)  at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)  at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:341)  at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)  at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)  at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)  at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)  at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)  at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)  at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)  at com.vrphogame.thyroidapp0802.JsoupRequest.getResponseByUrlAndData(JsoupRequest.java:19)  at com.vrphogame.thyroidapp0802.LoginActivity$1.onClick(LoginActivity.java:83)  at android.view.View.performClick(View.java:5200)  at android.view.View$PerformClick.run(View.java:21163)  at android.os.Handler.handleCallback(Handler.java:739)  at android.os.Handler.dispatchMessage(Handler.java:95)  at android.os.Looper.loop(Looper.java:148)  at android.app.ActivityThread.main(ActivityThread.java:5459)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)

查阅各种资料发现时主线程不能访问网络，在访问网络的代码前面添加如下代码即可：

StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy);

或者新开子线程（建议这种方法）：

new Thread(new Runnable() {    @Override    public void run() {        Document doc = null;        try {

            doc = Jsoup.connect("http://www.baidu.com").get();// Jsoup是我用的一个牛叉的jar包        } catch (IOException e) {            e.printStackTrace();        }        Log.d("doc", doc.toString()+"");    }}).start();

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