service

myservice

package com.ttit.core.service;

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

public class MyService2 extends Service {
    private final String TAG = "service";
    private int count;
    private boolean quit;

    //定义onBinder方法所返回的对象
    private MyBinder binder = new MyBinder();

    public class MyBinder extends Binder {
        public int getCount() {
            return count;
        }
    }

    //必须实现的方法,绑定Service时回调该方法
    @Override
    public IBinder onBind(Intent intent) {
        Log.e(TAG, "onBind方法被调用!");
        return binder;
    }

    //Service被创建时回调
    @Override
    public void onCreate() {
        super.onCreate();
        Log.e(TAG, "onCreate方法被调用!");
        //创建一个线程动态地修改count的值
        new Thread() {
            public void run() {
                while (!quit) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    count++;
                    Log.e(TAG, "count = " + count);
                }
            }
        }.start();
    }

    //Service断开连接时回调
    @Override
    public boolean onUnbind(Intent intent) {
        Log.e(TAG, "onUnbind方法被调用!");
        return true;
    }

    //Service被关闭前回调
    @Override
    public void onDestroy() {
        super.onDestroy();
        this.quit = true;
        Log.e(TAG, "onDestroyed方法被调用!");
    }

    @Override
    public void onRebind(Intent intent) {
        Log.e(TAG, "onRebind方法被调用!");
        super.onRebind(intent);
    }
}

Service2Activity

package com.ttit.core.service;

import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.ttit.helloworld.R;

public class Service2Activity extends AppCompatActivity {

    private Button btnbind;
    private Button btncancel;
    private Button btnstatus;
    //保持所启动的Service的IBinder对象,同时定义一个ServiceConnection对象
    private MyService2.MyBinder binder;

    //conn是为了监听客户端与服务端的链接情况
    private ServiceConnection conn = new ServiceConnection() {

        //Activity与Service断开连接时回调该方法
        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.e("service", " ------Service DisConnected-------");
        }

        //Activity与Service连接成功时回调该方法
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.e("service", " ------Service Connected------ - ");
            binder = (MyService2.MyBinder) service;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.service2_layout);
        btnbind = (Button) findViewById(R.id.btnbind);
        btncancel = (Button) findViewById(R.id.btncancel);
        btnstatus = (Button) findViewById(R.id.btnstatus);
        final Intent intent = new Intent(Service2Activity.this, MyService2.class);

        //点击绑定按钮时链接
        btnbind.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //绑定service
                bindService(intent, conn, Service.BIND_AUTO_CREATE);
            }
        });

        btncancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //解除service绑定
                unbindService(conn);
            }
        });

        btnstatus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "Service的count的值为:"
                        + binder.getCount(), Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(conn); // 销毁Activity时需要解绑Service
    }
}