Question

我有3个按钮可以使用wifi打开不同的LED。我想要做的是在按下按钮时启动一个线程。该线程将执行一个网络内容，即发送一串指令代码。但当我按下按钮时，它停止运行。如果发生异常，我想在吐司中显示异常。请帮忙。这是代码：

这是将显示3个按钮的活动。

package com.gfhz.appliancecontrol;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class LightsMenuActivity extends MainActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lights_menu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.display_lights_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void checkLightsStatus() {
        /*instructionID = "0400";
        Intent intent = new Intent(this, ConnectionSocket.class);
        intent.putExtra(INSTRUCTION, instructionID);
        startActivity(intent);*/
    }

    public void powerLamp1 (View view) {
        ConnectionSocket cs = new ConnectionSocket();
        cs.sendInstruction("0401");
    }
    public void powerLamp2(View view) {
        ConnectionSocket cs = new ConnectionSocket();
        cs.sendInstruction("0402");
    }
    public void powerLamp3(View view){
        ConnectionSocket cs = new ConnectionSocket();
        cs.sendInstruction("0403");
    }
}

这是将执行该线程的活动。

package com.gfhz.appliancecontrol;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.widget.Toast;

public class ConnectionSocket extends Activity{

Socket client;
ConnectionInfoActivity conInfo;
String instructionCode;
String serverAddr;
OutputStream os;
DataOutputStream dos;
String stoast;

public void sendInstruction (String instruction) {

    // Get the DEVICE ID
    String devId = conInfo.getDevId();
    // Concatenate instruction message and device Id
    instructionCode = devId.concat(instruction);

    // Get the SERVER IP ADDRESS
    serverAddr = "192.168.1.105";

    // Initialize PORT
    final int port = 2000;

    new Thread (new Runnable() {
        public void run() {

            try{
                // Open a socket
                client = new Socket(serverAddr, port);

                dos = new DataOutputStream(client.getOutputStream());
                dos.writeBytes(instructionCode);
            } catch (UnknownHostException e) {
                //TODO Auto-generated catch block
                e.printStackTrace();
                stoast = "Unknown Host Exception" + e.toString();
            } catch (IOException e) {
                // TODO Auto-generated cach block
                e.printStackTrace();
                // Display in TOAST
                stoast = "IO Exception" + e.toString();
            } finally {
                if (client != null) {
                    try {
                        client.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }).start();

    Toast.makeText(getApplicationContext(), stoast, Toast.LENGTH_SHORT).show();
}

}

按下按钮时启动一个android线程

0 个答案: