使用AsyncTask进行android网络连接
我在使用AsyncTask时遇到了一些麻烦，因为我之前从未遇到过它并且不知道我在做什么。
基本上我得到一个力量关闭，因为我试图在主类上运行连接。 有人可能会帮助我在代码中添加AsyncTask ：
package com.smarte.smartipcontrol; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; public class IPControl extends Activity { private Socket socket; private String serverIpAddress; private static final int REDIRECTED_SERVERPORT = 32; public PrintWriter out; public BufferedReader in ; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Get the message from the intent Intent intent = getIntent(); serverIpAddress = intent.getStringExtra(IPEntry.ACTUALSMARTIP); createConnection(); } public void getModel(View view) { try { out.println("[m\r\n"); //System.out.print("root\r\n"); while (! in .ready()); String textStatus = readBuffer(); } catch (IOException e) {} } public void createConnection() { try { InetAddress serverAddr = InetAddress.getByName(serverIpAddress); socket = new Socket(serverAddr, REDIRECTED_SERVERPORT); } catch (UnknownHostException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } try { out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); while (! in .ready()); readBuffer(); out.println("root\r\n"); //System.out.print("root\r\n"); while (! in .ready()); readBuffer(); out.println("root\r\n"); //System.out.print("root\r\n"); while (! in .ready()); readBuffer(); } catch (IOException e) {} //R.id.textStatus } private String readBuffer() throws IOException { String msg = ""; while ( in .ready()) { msg = msg + (char) in .read(); } //System.out.print(msg); if (msg.indexOf("SNX_COM> ") != -1) return msg.substring(0, msg.indexOf("SNX_COM> ")); else return msg; } }
只是一个关于migtht如何的简单示例：
public class IPControl extends Activity { private ProgressDialog pd = null; private String data = null; private Socket socket; private String serverIpAddress; private static final int REDIRECTED_SERVERPORT = 32; public PrintWriter out; public BufferedReader in ; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); try{ this.pd = ProgressDialog.show(this, "Loading..", "Please Wait...", true, false); new AsyncAction().execute(); }catch (Exception e) { e.printStackTrace(); } } private class AsyncAction extends AsyncTask { protected Void doInBackground(String... args) { try { InetAddress serverAddr = InetAddress.getByName(serverIpAddress); socket = new Socket(serverAddr, REDIRECTED_SERVERPORT); } catch (UnknownHostException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } try { out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); while (! in.ready()); readBuffer(); out.println("root\r\n"); //System.out.print("root\r\n"); while (! in .ready()); readBuffer(); out.println("root\r\n"); //System.out.print("root\r\n"); while (! in .ready()); String msg = ""; while (in.ready()) { msg = msg + (char) in .read(); } } catch (IOException e) {} return null;//returns what you want to pass to the onPostExecute() } protected void onPostExecute(String result) { //resultis the data returned from doInbackground IPControl.this.data = result; if (IPControl.this.pd != null) { IPControl.this.pd.dismiss(); } } }
通过这个简单的教程来了解AsyncTask是什么以及如何使用它：
https://androidresearch.wordpress.com/2012/03/17/understanding-asynctask-once-and-forever/
然后尝试修改代码以使用异步任务。 如果你遇到问题，请回到这里:-)
通过检查文件在这里 ..
您需要将创建连接部分放在doInBackground ..然后在onPostExecute执行您想要更新的任何内容。