10.Service

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

public class MyService2 extends Service {

    private static final String TAG = "MyService2";

    /**
     * 调用时机：当 Service 被第一次创建时调用
     * 作用：在服务启动时执行一次性初始化操作，比如设置资源、初始化变量等。此时服务尚未开始处理任务。
     */
    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this, "dddddddddddddddddd", Toast.LENGTH_LONG).show();
    }

    /**
     * 调用时机：每次通过 startService() 启动服务时，都会调用此方法。
     * 作用：此方法用于执行服务的实际任务。你可以在这里启动一个长时间运行的操作，或者处理传递给服务的 Intent
     */
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, "sssssssssssssssssssssssss", Toast.LENGTH_LONG).show();
        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * 调用时机：当组件（如 Activity）调用 bindService() 时，调用此方法。
     * 作用：此方法在服务被绑定时调用。通过此方法返回一个 IBinder 对象，允许客户端与服务进行通信。若服务不支持绑定，可以返回 null。
     */
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

    Intent intent = new Intent(this, MyService2.class);
    startService(intent);

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.widget.Toast;

public class MyService extends Service {
    private static final String TAG = "MyService";

    @Override
    public IBinder onBind(Intent intent) {
        return new LocalBinder();
    }

    public void performTask() {
        Toast.makeText(this, "sssssseeeeeeeeee", Toast.LENGTH_LONG).show();
    }


    public class LocalBinder extends Binder {
        public MyService getService() {
            return MyService.this;
        }
    }

}

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private MyService myService;

    private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName className, IBinder service) {
            MyService.LocalBinder binder = (MyService.LocalBinder) service;
            myService = binder.getService();
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button test01Btn = findViewById(R.id.test01Btn);
        test01Btn.setOnClickListener((View v)->{
            myService.performTask();
        });
    }


    @Override
    protected void onStart() {
        super.onStart();
        // Bind to MyService
        Intent intent = new Intent(this, MyService.class);
        bindService(intent, connection, Context.BIND_AUTO_CREATE);
    }


    @Override
    protected void onStop() {
        super.onStop();
        if (myService != null) {
            unbindService(connection);
        }
    }

}

public class MyIntentService extends IntentService {

    public MyIntentService() {
        super("MyIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        // Task logic here
    }
}