Android客户端意外停止

我正在android中实现一个客户端套接字。但当它运行时崩溃了，实际上我正试图用android控制linux系统。所以服务器是linux。 这是我的密码

package com.example.clientsocket;


import java.io.OutputStreamWriter;
import java.net.Socket;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

@SuppressLint("HandlerLeak")
public class MainActivity extends Activity {
TextView serverMessage;
Thread m_objThreadClient;
Socket clientSocket;
private SensorManager sensorManager;
private long lastUpdate;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    serverMessage=(TextView)findViewById(R.id.textView1);


    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    lastUpdate = System.currentTimeMillis();
Button b=(Button)findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {

      public void onClick(View v) 
{

    m_objThreadClient=new Thread(new Runnable() {
          public void run()
      {
          try 
          {
              EditText ipt=(EditText)findViewById(R.id.editText1);
                String ip=ipt.getText().toString();
                Socket sock = new Socket("192.168.42.130",20056);
                OutputStreamWriter osw = new OutputStreamWriter(sock.getOutputStream());
                char a='g';
                osw.write(a);
                osw.flush();


              } 
          catch (Exception e) 
          {
                    // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
            });

    m_objThreadClient.start();

}
});
}

public void onSensorChanged(SensorEvent event) {
  if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
    getAccelerometer(event);
  }

}

private void getAccelerometer(SensorEvent event) {
    float[] values = event.values;
    // Movement

    float y = values[1];




    long actualTime = System.currentTimeMillis();
    if (y>3 ) //
    {
      if (actualTime - lastUpdate < 200) {
    return;
      }
      lastUpdate = actualTime;
      m_objThreadClient=new Thread(new Runnable() {
          public void run()
      {
      try 
      {
      EditText ipt=(EditText)findViewById(R.id.editText1);
        String ip=ipt.getText().toString();
            Socket sock = new Socket("192.168.42.130",20056);
            OutputStreamWriter osw = new OutputStreamWriter(sock.getOutputStream());
            char a='r';
            osw.write(a);
            osw.flush();


       } 
      catch (Exception e) 
      {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

    }
        });

m_objThreadClient.start();




    }
  }

  public void onAccuracyChanged(Sensor sensor, int accuracy) {

  }

  @Override
  protected void onResume() {
    super.onResume();
    // register this class as a listener for the orientation and
    // accelerometer sensors
    sensorManager.registerListener((SensorEventListener) this,
        sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
        SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  protected void onPause() {
    // unregister listener
    super.onPause();
    sensorManager.unregisterListener((SensorListener) this);
  }




Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        messageDisplay(msg.obj.toString());
    }
};
public void messageDisplay(String servermessage)
{
    serverMessage.setText(""+servermessage);
}

}

---

错误是您试图在

onResume

方法中将MainActivity强制转换为SensorEventListener。您需要

一个SensorEventListener对象。

作为函数的第一个参数，而不是尝试强制转换当前活动

您需要：

在活动中实施SensorEventListener

然后，您可以将此作为第一个参数传递。像这样：

sensorManager.registerListener(this,
        sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
        SensorManager.SENSOR_DELAY_NORMAL);

---

您的活动必须实现SensorEventListner，如下所示：

public class MainActivity extends Activity implements SensorEventListener {

---

如果问题已解决，请随时标记为接受答案：）

public class MainActivity extends Activity implements SensorEventListener {