Android | 调用startService

activity_main.xml

MainActivity.java

package cn.itcast.service;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
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);
        inti();//调用init()方法
    }
    //inti()方法，在该方法中获取界面控件并实现控件的点击事件。
    private void inti() {
        Button btn_start = findViewById(R.id.btn_start);
        Button btn_stop = findViewById(R.id.btn_stop);
        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //开启服务
                Intent intent = new Intent(MainActivity.this, MyService.class);
                startService(intent);
            }
        });
        btn_stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //关闭服务
                Intent intent = new Intent(MainActivity.this, MyService.class);
                stopService(intent);
            }
        });
    }

}

---

MyService.java

package cn.itcast.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class MyService extends Service {
    //重写Service生命周期中的onCreate()方法
   @Override
   public void onCreate(){
       super.onCreate();
       Log.i("Myservice","创建服务，执行onCreate()方法");
   }
    //重写Service生命周期中的onStartCommand()方法
   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {
       Log.i("Myservice","开启服务，执行onStartCommand()方法");
       return super.onStartCommand(intent,flags,startId);
   }
    @Override
    public IBinder onBind(Intent intent) {
       return null;
    }
    //重写Service生命周期中的onStartCommand()方法
    @Override
    public void onDestroy() {
        Log.i("Myservice","关闭服务，执行onDestroy()方法");
    }

}

效果展示：