首先,我是Android和Java的新手......我正在研究机器人,需要发送无线命令。在尝试了几种方法来做到这一点,并获得大量错误和时间调试(不理解示例代码中发生的一半事件)后,我发现最简单的通信方式就是使用套接字。我遵循教程http://android-er.blogspot.com/2011/01/simple-communication-using.html,它很好用!它确实如此,没有错误,这是一个可喜的解决方案,但不是我想要的。它从Android开始,发送消息到PC,然后等待PC的响应,然后结束,直到再次单击该按钮。我想让它朝相反的方向前进。我试着只是切换代码,但一直在关闭。我终于搞定了,所以当你从android发送消息后,PC响应,然后android自动发送另一条消息,以便它始终等待PC。它不能很好地工作,有时因按钮而崩溃。此外,它不再显示来自PC的消息!我试图把代码的重要部分放入一个线程,所以android永远不需要被触及,并保持循环...我不知道为什么这不起作用,我得到以下错误:将PC循环到Android Socket通信?
11-24 13:21:11.492: E/AndroidRuntime(2656): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
我的整个程序是一个类:
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
EditText textOut;
TextView textIn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//textOut = (EditText)findViewById(R.id.textout);
//Button buttonSend = (Button)findViewById(R.id.send);
textIn = (TextView)findViewById(R.id.textin);
//buttonSend.setOnClickListener(buttonSendOnClickListener);
// start a loop
new Thread(new Runnable()
{
public void run()
{
while (true)
{
Socket socket = null;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null;
try {
socket = new Socket("192.168.0.9", 8888);
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataOutputStream.writeUTF("Received!");
dataInputStream = new DataInputStream(socket.getInputStream());
textIn.setText(dataInputStream.readUTF());
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if (socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null){
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null){
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}).start();
}}
任何帮助或更好的方法的建议,这样做将是巨大的!谢谢!