Android Studio 进行网络连接时，出现 HttpResponse reponse =new DefaultHttpClient().execute(request)处有错误

<uses-permission android:name="android.permission.INTERNET" />

2、没有在activity函数中添加Exception()函数：

public void Exception(){
//避免出现android.os.NetworkOnMainThreadException异常
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads().detectDiskWrites().detectNetwork()
.penaltyLog().build());

StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects().detectLeakedClosableObjects()
.penaltyLog().penaltyDeath().build());
}

 public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_aty);
Exception();//避免出现android.os.NetworkOnMainThreadException异常
...............
...............
}