android.os.NetworkOnMainThreadException异常

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这个异常大概意思是在主线程访问网络时出的异常。 Android在4.0之前的版本支持在主线程中访问网络，但是在4.0以后对这部分程序进行了优化，也就是说访问网络的代码不能写在主线程中了。

为了把域名转化为ip地址，我在主线程中调用GetInetAddress函数。

public static String GetInetAddress(String  host){//域名host转化为ip地址IPAddress返回        String IPAddress = "";         InetAddress ReturnStr1 = null;        try {            ReturnStr1 = java.net.InetAddress.getByName(host);            IPAddress = ReturnStr1.getHostAddress();            System.out.println(IPAddress);        } catch (UnknownHostException e) {            // TODO Auto-generated catch block            e.printStackTrace();            return  IPAddress;        }        return IPAddress;    }

结果l出错，log信息为：

01-15 09:16:50.340: E/AndroidRuntime(3927): FATAL EXCEPTION: main01-15 09:16:50.340: E/AndroidRuntime(3927): android.os.NetworkOnMainThreadException01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)01-15 09:16:50.340: E/AndroidRuntime(3927):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)01-15 09:16:50.340: E/AndroidRuntime(3927):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)01-15 09:16:50.340: E/AndroidRuntime(3927):     at java.net.InetAddress.getByName(InetAddress.java:289)01-15 09:16:50.340: E/AndroidRuntime(3927):     at com.csipsimple.ui.HspLaunch.GetInetAddress(HspLaunch.java:655)01-15 09:16:50.340: E/AndroidRuntime(3927):     at com.csipsimple.ui.HspLaunch$LoginBtnListener.onClick(HspLaunch.java:264)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.view.View.performClick(View.java:4084)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.view.View$PerformClick.run(View.java:16966)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.os.Handler.handleCallback(Handler.java:615)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.os.Handler.dispatchMessage(Handler.java:92)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.os.Looper.loop(Looper.java:137)01-15 09:16:50.340: E/AndroidRuntime(3927):     at android.app.ActivityThread.main(ActivityThread.java:4746)01-15 09:16:50.340: E/AndroidRuntime(3927):     at java.lang.reflect.Method.invokeNative(Native Method)01-15 09:16:50.340: E/AndroidRuntime(3927):     at java.lang.reflect.Method.invoke(Method.java:511)01-15 09:16:50.340: E/AndroidRuntime(3927):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:917)01-15 09:16:50.340: E/AndroidRuntime(3927):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)01-15 09:16:50.340: E/AndroidRuntime(3927):     at dalvik.system.NativeStart.main(Native Method)

解决方法有两个：
1、调用上面函数前，在onCreate函数里面添加如下代码：

//详见StrictMode文档StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());

2、使用Thread、Runnable、Handler这三个类

public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    this.setContentView(R.layout.hsp_login_dialog);    new Thread(runnable).start();}Handler handler = new Handler(){    @Override    public void handleMessage(Message msg) {        super.handleMessage(msg);        Bundle data = msg.getData();        String val = data.getString("value");        Log.i("mylog","转化后地址为-->" + val);    }}Runnable runnable = new Runnable(){    @Override    public void run() {        //        // TODO:在这里调用GetInetAddress函数处理，返回IPAddress.        //        Message msg = new Message();        Bundle data = new Bundle();        data.putString("value",IPAddress);        msg.setData(data);        handler.sendMessage(msg);    }}

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