Android中服务与活动的交互

// 在活动中启动服务并传递数据
Intent intent = new Intent(this, MyService.class);
intent.putExtra("data", "Hello, Service!");
startService(intent);

// 在服务中获取传递的数据
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    String data = intent.getStringExtra("data");
    // 处理数据
    return super.onStartCommand(intent, flags, startId);
}

// 在活动中绑定服务
private MyService.MyBinder mBinder;
private ServiceConnection mConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        mBinder = (MyService.MyBinder) iBinder;
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        mBinder = null;
    }
};

// 绑定服务
Intent intent = new Intent(this, MyService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);

// 调用服务中的方法
if (mBinder != null) {
    mBinder.doSomething();
}

// 在服务中实现绑定服务的方法
public class MyService extends Service {
    private final IBinder mBinder = new MyBinder();

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public void doSomething() {
        // 执行一些操作
    }

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

// 在活动中发送广播通知
Intent intent = new Intent("com.example.MY_ACTION");
intent.putExtra("data", "Hello, Service!");
sendBroadcast(intent);

// 在服务中注册广播接收器
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String data = intent.getStringExtra("data");
        // 处理数据
    }
};

@Override
public void onCreate() {
    super.onCreate();
    IntentFilter filter = new IntentFilter("com.example.MY_ACTION");
    registerReceiver(mReceiver, filter);
}

@Override
public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(mReceiver);
}