android Service的一些注意点

onbind后台服务时会调用onServiceConnected方法但unbind时不会调用onServiceDisconnected方法

系统结束服务时才会调用。

MainActivity

private MyService myService;

private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        Log.d(TAG, "onServiceConnected: ");
        myService = ((MyService.MyBinder)iBinder).getService();
    }

    /**
     * 注意 该方法只有后台服务被强制终止时间才会调用 自己接触绑定不会调用
     * @param componentName
     */
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        Log.d(TAG, "onServiceDisconnected: ");
        myService = null;
    }
};

case R.id.bind_service:
    Intent intent_bind = new Intent(MainActivity.this, MyService.class);
    intent_bind.putExtra("message", "绑定后台服务");
    bindService(intent_bind, serviceConnection, Context.BIND_AUTO_CREATE);
    break;
case R.id.unbind_service:
    unbindService(serviceConnection);
    //不设置为null 解除绑定服务终止也会保存一份实例 可以照常调用Service中的方法
    myService = null;
    break;

android O 通知需要添加渠道前台服务也需要添加渠道才能显示

ForegroundService

@Override
public void onCreate() {
    Notification.Builder builder = new Notification.Builder(this);
    builder.setSmallIcon(R.mipmap.ic_launcher);
    builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
    builder.setContentTitle("ForegroundService");
    builder.setContentText("ForegroundService正在运行");
    if(Build.VERSION.SDK_INT >= 26) {
        createChannel();
        builder.setChannelId("channel_01");
    }
    Notification notification = builder.build();
    notification.flags = Notification.FLAG_AUTO_CANCEL;
    startForeground(1, notification);
    super.onCreate();
}

@RequiresApi(api=26)
public void createChannel(){
    /**
     * 创建通知渠道1
     */
    NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    //渠道id
    String id = "channel_01";
    //用户可以看到的通知渠道的名字
    String name = "前台通知";
    int importance = NotificationManager.IMPORTANCE_HIGH;
    NotificationChannel channel = new NotificationChannel(id, name, importance);
    //配置通知渠道的属性
    channel.setDescription("前台通知的专用渠道");
    //设置通知出现时的闪灯（如果android设备支持的话）
    channel.enableLights(true);
    channel.setLightColor(Color.GREEN);
    //在notificationmanager中创建该通知渠道
    manager.createNotificationChannel(channel);
}

建议在Activity的onDestroy中关闭服务

@Override
protected void onDestroy() {
    //避免服务在退出客户端后还存活
    unbindService(serviceConnection);
    Intent intent_close = new Intent(MainActivity.this, MyService.class);
    stopService(intent_close);
    super.onDestroy();
}

android Service的一些注意点

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