在code插座ClientSocket的=新的Socket（）;在崩溃的Andr​​oid应用。为什么？ [英] The code Socket clientSocket = new Socket(); crashes in android app. Why?

问题描述

我使用的是标准的客户端code将字符串发送到我的服务器。它完美的作品，当我运行从Eclipse的Java项目，但是当我运行通过一个按钮一样code在我的Andr​​oid应用程序这是行不通的。调试后，我得到了在我行尝试code崩溃

插座ClientSocket的=新的Socket（192.168.1.91，6789）;

请帮我。

 公共无效button2OnClick（查看K）{    //测试服务器连接
    尝试{        串句;        串modifiedSentence;
        的BufferedReader inFromUser =新的BufferedReader（新的InputStreamReader（System.in））;
        ClientSocket的插座=新的Socket（192.168.1.91，6789）;
        Button按钮=（按钮）K;
        （（按钮）K）.setText（完成）;
        DataOutputStream类outToServer =新的DataOutputStream类（clientSocket.getOutputStream（））;
        的BufferedReader inFromServer =新的BufferedReader（新的InputStreamReader（clientSocket.getInputStream（）））;
        一句话=与Android连接成功;
        outToServer.writeBytes（句+的'\\ n'）;
        modifiedSentence = inFromServer.readLine（）;
        clientSocket.close（）;
    }
    赶上（例外IO）{    }}
 

解决方案

由于您从主线程做到这一点，你已经将它移动到一个线程。

 新主题（新的Runnable（）{
    公共无效的run（）{
        //打开套接字
    }
}）。开始（）;
 

接下来，您必须添加对AndroidManifest上网权限

 ＆LT;使用许可权的android：NAME =android.permission.INTERNET对/＆GT;
 

在Android的，我们可以使用AsyncTask的女巫可以在后台操作完成对主线程执行操作。这将是：

 新的AsyncTask＆LT;太虚，太虚，太虚＆GT;（）{        @覆盖
        保护无效doInBackground（虚空...... PARAMS）{
            串modifiedSentence;
            的BufferedReader inFromUser =新的BufferedReader（新的InputStreamReader（System.in））;
            ClientSocket的插座=新的Socket（192.168.1.91，6789）;
            DataOutputStream类outToServer =新的DataOutputStream类（clientSocket.getOutputStream（））;
            的BufferedReader inFromServer =新的BufferedReader（新的InputStreamReader（clientSocket.getInputStream（）））;
            一句话=与Android连接成功;
            outToServer.writeBytes（句+的'\\ n'）;
            modifiedSentence = inFromServer.readLine（）;
            clientSocket.close（）;            返回null;
        }        @覆盖
        保护无效onPostExecute（）{
            super.onPostExecute（）;
            Button按钮=（按钮）K;
            （（按钮）K）.setText（完成）;
        }
    }。执行（）;
 

I am using a standard client code to send a string to my server. It works perfect when I am running a java project from eclipse but it doesn't work when I am running the same code via a button on my android application. After debugging I got my try code crashes in the line

Socket clientSocket = new Socket("192.168.1.91", 6789);

Please help me.

    public void button2OnClick(View k){

    //Testing Server Connection
    try{

        String sentence;

        String modifiedSentence;
        BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in));
        Socket clientSocket = new Socket("192.168.1.91", 6789);
        Button button=(Button) k;
        ((Button) k).setText("Done");
        DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
        BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        sentence = "connection with android successful";
        outToServer.writeBytes(sentence + '\n');
        modifiedSentence = inFromServer.readLine();
        clientSocket.close();


    }
    catch(Exception IO){

    }



}

解决方案

Because you do it from the main thread, you have move it to a Thread.

new Thread(new Runnable(){
    public void run(){
        //open socket
    }
}).start();

Next you have to add the internet permission on the AndroidManifest

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

In android we can use AsyncTask witch can perform actions on main thread when the background operation is finished. It will be :

new AsyncTask<Void,Void,Void>(){

        @Override
        protected Void doInBackground(Void... params) {
            String modifiedSentence;
            BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in));
            Socket clientSocket = new Socket("192.168.1.91", 6789);
            DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
            BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            sentence = "connection with android successful";
            outToServer.writeBytes(sentence + '\n');
            modifiedSentence = inFromServer.readLine();
            clientSocket.close();

            return null;
        }

        @Override
        protected void onPostExecute() {
            super.onPostExecute();
            Button button=(Button) k;
            ((Button) k).setText("Done");
        }
    }.execute();

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