套接字连接共享首选项不起作用

Question

我正在创建一个Android应用程序，其中我在一个活动中创建套接字连接并使用共享首选项，而在另一个活动中，我正在获取套接字变量以进行更新的工作，但它不能正常工作

我的问题是如何在不同的行为中使用我的exixting套接字连接我搜索了它有一些像 singltone类，Aysnc任务，< / strong>但是我没有得到它，如果singltone是在不同的活动中使用套接字连接的正确方法那么我如何在下面的代码中使用singlton类请建议我改变... !!!

否则我正在做共享PRef的正确方法如下？还提示了一些变化！

更新：标记为单独建议

所以这里是第一个活动

public class ipInfo extends AppCompatActivity {
    EditText ipaddress;    
    String IPADD;
    Integer PORT=null;   
    EditText portnum;
    Button connect_btn; 
    StrictMode.ThreadPolicy policy;
    Socket cs = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ipinfo);
    policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    ipaddress = (EditText)findViewById(R.id.editText);
    portnum = (EditText)findViewById(R.id.editText2);
    connect_btn =(Button)findViewById(R.id.button);
    ip_check();
}

public void ip_check(){
    connect_btn.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    IPADD=ipaddress.getText().toString();
                    PORT=Integer.parseInt(portnum.getText().toString());
                    try { cs = new Socket();
                            cs.connect(new InetSocketAddress(IPADD, PORT), 2000);
                            SharedPreferences sharedPreferences = getSharedPreferences("ipstore", Context.MODE_PRIVATE);
                            SharedPreferences.Editor editor = sharedPreferences.edit();
                            editor.putString("ipadd",IPADD);
                            editor.putInt("port",PORT);
                            editor.commit();
                            if(cs.isConnected()) {
                                Toast.makeText(ipInfo.this, "Connected", Toast.LENGTH_SHORT).show();
                                Intent inst = new Intent(ipInfo.this,homeActivity.class);
                                startActivity(inst);
                                finish();
                            }
                        }catch (IOException e)
                        {Toast.makeText(ipInfo.this,"Server is disconnected\n",Toast.LENGTH_SHORT).show();
                        }catch (Exception e)
                        {Toast.makeText(ipInfo.this,e.getMessage(),Toast.LENGTH_SHORT).show();}
                }
            }
    );
}   
}

从此活动获取以下活动中的值

public class PowerActivity extends AppCompatActivity {
    Button restart,shutdown,logof,sleep,abort;
    StrictMode.ThreadPolicy policy;
    Socket cs = null;
    DataOutputStream out=null;
    String SERVERIP;
    int PORT;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_power);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    restart = (Button)findViewById(R.id.restart);
    shutdown = (Button)findViewById(R.id.shutdown);
    logof = (Button)findViewById(R.id.logof);
    sleep = (Button)findViewById(R.id.sleep);
    abort = (Button)findViewById(R.id.abort);
    SharedPreferences sharedPreferences=getSharedPreferences("ipstore", Context.MODE_PRIVATE);
    SERVERIP =sharedPreferences.getString("ipadd","");
    PORT=sharedPreferences.getInt("port", 8002);
    Toast.makeText(this,"Working"+SERVERIP+"\n"+PORT,Toast.LENGTH_LONG).show();//this line working fine
    policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    remotecmnd();
}
public void remotecmnd(){
    restart.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //restart code
                        try{
                            cs = new Socket(SERVERIP,PORT);
                            try{
                                out = new DataOutputStream(cs.getOutputStream());
                                out.writeUTF("restart");
                                Toast.makeText(PowerActivity.this, "RESTART SUCCESS", Toast.LENGTH_LONG).show();
                                } catch (Exception ea) {
                                    Toast.makeText(PowerActivity.this, ea.getMessage(), Toast.LENGTH_LONG).show();
                                }
                        }catch (IOException e) {
                            Toast.makeText(PowerActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
                        }
                }
            }
    );
}
}

这是服务器部件代码

public class serverbackend extends Thread implements Runnable{
public static int SERVERPORT = 8002;
public boolean running = false;
public volatile boolean stop = false;
public Socket client = null;
ServerSocket sc = null;
String value;


public static void main(String[] args) {
    mwcobj = new MainWindowController();
}


@Override
public void run() {
    super.run();
    running = true;
    try {
        System.out.println("Server Has Started........ \nWaiting for client........");
        sc = new ServerSocket(SERVERPORT);
        try {
            while (!stop && running) {
                client = sc.accept();
                System.out.println("Connection Accepted......");
                DataInputStream dis = new DataInputStream(client.getInputStream());
                value = dis.readUTF();

                switch (value) {
                //Restart the system
                    case "restart":
                        System.out.println("Restarting");
                        Runtime.getRuntime().exec("shutdown -r -t 10");
                        break;

                //some extra code
                    default:
                        break;
                } 
            }
        } catch (IOException e) {
            System.out.println("Inner try catch "+e.getMessage());
        }
    } catch (IOException e) {
        System.out.println("Final try catch error "+e.getMessage());
    }
}


   public void requestStop(){ 
    try{
         stop = true;
         sc.close();
         System.out.println("Server Has Stopped");
    }catch(IOException e){System.out.println("Server Stopped "+e.getMessage());}


 }
    }

Answer 1

在我看来，我创建了一个蓝牙通信应用程序，我遇到了同样的问题，

这个问题的答案是使用getter和setter方法。从其他java类设置套接字和获取套接字非常容易，而不是跨活动发送，如果我遇到其他方法，我一定会告诉你的。

使用getter setter对我很有帮助。

public class getset
{


    static BluetoothSocket sock;

    getset(BluetoothSocket sock)
    {
        this.sock=sock;
    }


    public static synchronized BluetoothSocket getSock() {
        return sock;
    }

    public static synchronized void setSock(BluetoothSocket sock) {
        getset.sock = sock;
    }
}

在使用共享偏好的地方

setSock(socket);  //socket is the Bluetoothsocket which you have to save

Bluetoothsocket socket=getSock(); // to get value from the socket

参考https://teamtreehouse.com/community/how-do-you-add-getters-and-setter-in-android-java