android-studio startService服务

.xml

MyService.java

package com.example.administrator.fuwu;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

public class MyService extends Service{
    @Nullable
    @Override
    public IBinder onBind(Intent intent){
        return null;
    }
    public void onCreate(){
        super.onCreate();
        Log.i("StartService","onCreate()");
    }
    public int onStartCommand(Intent intent,int flags,int startId){
        Log.i("StartService","onStartCommand()");
        return super.onStartCommand(intent,flags,startId);
    }
    public void onDestroy(){
        super.onDestroy();
        Log.i("StartService","onDestroy()");
    }
}

MainActivity.java

package com.example.administrator.fuwu;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button start = (Button) findViewById(R.id.btn_start);
        Button stop = (Button) findViewById(R.id.btn_stop);
    }
    public void start(View view){
        Intent intent = new Intent(this,MyService.class);
        startService(intent);
    }
    public void stop(View view){
        Intent intent = new Intent(this,MyService.class);
        stopService(intent);
    }
}