java - 使用 asynctask 进行网络连接

Question

我正在尝试将 asynctask 合并到我的代码中，因为由于NetworkOnMainThreadException.

我已经完成了一些教程，但我仍然无法理解它。每次我尝试它时，我都会到处出错。

我看过的教程：

[http://developer.android.com/reference/android/os/AsyncTask.html][1]
[https://androidresearch.wordpress.com/2012/03/17/understanding-asynctask-once-and-forever/][2]

基本上代码正在做的是：

从意图中获取 IP 地址。
使用 32 端口连接到 IP
然后发送一个命令，等待响应并发送另一个命令。
在我们发送 2 个命令后，我应该得到“SNX_COM>”的响应
建立连接后，我希望连接保持打开状态，以便在单击按钮时发送特定命令。

^^这基本上是我的代码应该实现的^^

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.os.AsyncTask;
import android.os.Bundle;
import android.view.View;

public class IPControl extends Activity {

private Socket socket;
private String serverIpAddress = "com.smarte.smartipcontrol.ACTU_IP";
private static final int REDIRECTED_SERVERPORT = 32;
public PrintWriter out;
public BufferedReader in;
public String data;
public Object pd;



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) {}
}


@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   setContentView(R.layout.act_ipcontrol);


   try{   

    new AsyncAction().execute();

   }catch (Exception e) {
       e.printStackTrace();
   }

   }



private class AsyncAction extends AsyncTask<String, Void, String> {
   protected String 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) {

   //results the data returned from doInbackground

       IPControl.this.data = result;



       }
   }


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;
}

}

日志猫

12-03 15:39:56.346: E/AndroidRuntime(2697): FATAL EXCEPTION: AsyncTask #5
12-03 15:39:56.346: E/AndroidRuntime(2697): java.lang.RuntimeException: An error occured while executing doInBackground()
12-03 15:39:56.346: E/AndroidRuntime(2697):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.lang.Thread.run(Thread.java:856)
12-03 15:39:56.346: E/AndroidRuntime(2697): Caused by: java.lang.NullPointerException
12-03 15:39:56.346: E/AndroidRuntime(2697):     at com.smarte.smartipcontrol.IPControl$AsyncAction.doInBackground(IPControl.java:71)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at com.smarte.smartipcontrol.IPControl$AsyncAction.doInBackground(IPControl.java:1)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-03 15:39:56.346: E/AndroidRuntime(2697):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-03 15:39:56.346: E/AndroidRuntime(2697):     ... 4 more

score 1 · Accepted Answer

建立连接后，我希望连接保持打开状态，以便在单击按钮时发送特定命令。

当您想向服务器发送命令时，您可能必须创建一个新线程：

button.setOnClickListener(new OnClickListener()
{
    public void onClick(View arg0)
    {
      new Thread()
      {
        @Override
        public void run()
        {
          methods.sendCommandToServer();
        } 
      }.start(); 
     } 
  });

score 1 · Accepted Answer

您必须将您的 asynctaskcreateConnection();移至doInBackground()您必须添加为项目的内部类或单独类例如：

 private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
 protected Void doInBackground(Param[]...) {
     createConnection();
 }

 protected void onProgressUpdate() {
     setProgressPercent(progress[0]);
 }

 protected void onPostExecute() {


 }

}

这是您提供的第一个链接，我只是对其进行了一些更改。确保从方法 createConnection() 返回某些内容，以便您知道 asynctask 是否成功完成并相应更改 DownloadFilesTask 以便doInBackground()返回onPostExecute()相同的类型

java - 使用 asynctask 进行网络连接

2 回答 2

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