java - 不幸的是安卓已经停止了

Question

我有一个问题。当我运行 Android 程序时，出现错误:“不幸的是，Android 已停止”。为什么我在运行应用程序时看到此错误？听到是我的文件:

enter code here
import java.io.IOException;
import java.io.PrintWriter;
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;

public class SimpleClientActivityActivity extends Activity {

private Socket client;
private PrintWriter printwriter;
private EditText textField;
private Button button;
private String messsage;

@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

 //textField = (EditText) findViewById(R.id.editText1); //reference to the text field
  button = (Button) findViewById(R.id.button1);   //reference to the send button

  //Button press event listener
  button.setOnClickListener(new View.OnClickListener() {

   public void onClick(View v) {

   //messsage = textField.getText().toString(); //get the text message on the text      field
    //textField.setText("");      //Reset the text field to blank

  try {

 client = new Socket("10.0.2.2", 4444);  //connect to server
 printwriter = new PrintWriter(client.getOutputStream(),true);
 printwriter.write(messsage);  //write the message to output stream

 printwriter.flush();
 printwriter.close();
 client.close();   //closing the connection

  } catch (UnknownHostException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
 });

 }
}

我想使用我的 adnroid 客户端向 PC 服务器发送短信

Answer 1

可能是因为你在主线程上进行网络操作。查看您的 logcat，会出现红色信息。