Android 客户端 TCP socket出现 android.os.NetworkOnMainThreadException

Android 客户端 TCP socket出现 android.os.NetworkOnMainThreadException 

这个问题主要是把网络操作放在了主线程当中，如果将套接字初始化放于一个继承thread的类当中也是算在主线程，如

public class ReceiveThread extends Thread{Socket socket;InputStream inputStream ;OutputStream outputStream; private String str; private byte[] buffer ;public ReceiveThread() {// TODO Auto-generated constructor stub// 创建一个Socket对象，并指定服务端的IP及端口号try {//socket = new Socket("192.168.191.1", 6800);//InetAddress.getByName(System.out.println("还未连接1！！！");socket=new Socket();System.out.println("还未连接2！！！");socket.connect(new InetSocketAddress("192.168.191.1", 6800),200);System.out.println("连接成功！！！");System.out.println("--step2-->>>");//inputStream = socket.getInputStream();System.out.println("--step3-->>>");//outputStream = socket.getOutputStream();System.out.println("--step4-->>>");System.out.println("--inputStream-->>>"+inputStream.toString());System.out.println("--outputStream-->>>"+outputStream.toString());//向服务器端发送消息} catch (UnknownHostException e) {// TODO: handle exceptione.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}

解决上面问题的其中第一种办法是：

上面的代码的套接字相当于在主线程中，这是不可取的，应当放入run（）当中才行

@Overridepublic void  run() {Socket socket;InputStream inputStream ;OutputStream outputStream = null;  String str=null;  byte[] buffer ;try {//socket = new Socket("192.168.191.1", 6800);//InetAddress.getByName(System.out.println("还未连接1！！！");socket=new Socket();System.out.println("还未连接2！！！");socket.connect(new InetSocketAddress("192.168.191.1", 6800),200);System.out.println("连接成功！！！");System.out.println("--step2-->>>");inputStream = socket.getInputStream();System.out.println("--step3-->>>");outputStream = socket.getOutputStream();System.out.println("--step4-->>>");System.out.println("--inputStream-->>>"+inputStream.toString());System.out.println("--outputStream-->>>"+outputStream.toString());//向服务器端发送消息} catch (UnknownHostException e) {// TODO: handle exceptione.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}Message msg=new Message();msg.what =1;msg.obj =str;mHandler.sendMessage(msg);// 发送读取的数据到服务端}

第二种解决方法：

@SuppressLint("NewApi") public class MainActivity extends Activity implements OnClickListener{EditText edit_data=null;Button  button_connect=null;Button  button_disconnect=null;//@SuppressLint("NewApi") 是使在主线程中能运行网络服务    @SuppressLint("NewApi") @TargetApi(Build.VERSION_CODES.GINGERBREAD) @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);              //是使在主线程中能运行网络服务        if (android.os.Build.VERSION.SDK_INT > 9) {            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();            StrictMode.setThreadPolicy(policy);}                        edit_data=(EditText) this.findViewById(R.id.edit_data);        button_connect =(Button) this.findViewById(R.id.button_connect);        button_disconnect =(Button) this.findViewById(R.id.button_disconnect);        button_connect.setOnClickListener(this);        button_disconnect.setOnClickListener(this);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;            } Handler mHandler=new Handler(){ public void handMessage(Message msg) { switch (msg.what) {case 1:         String strRcv = (msg.obj).toString();               edit_data.setText("接收到数据: " + strRcv);               Log.v("Leo: Rcv: ", strRcv);               // 显示接收到的数据               // mTextView.setText((msg.obj).toString());               break;}  } };

}

上面有三处注释的就是起到能在主线程中运行网络服务的作用