Android，与后台服务通信

我有在设备启动时启动的后台服务。我想在我的活动中从该服务获取一些数据

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我只在活动开始时才需要数据。因此，基本要求是，当我的活动启动时，它与后台服务建立连接并从该服务获取数据，当活动停止时，然后断开与该服务的连接。

您需要使用bindService（）与正在运行的服务绑定并与之通信

参考：

例如（来自Android文档）

为您服务

 public class LocalService extends Service {
    // Binder given to clients
   private final IBinder mBinder = new LocalBinder();
   // Random number generator
   private final Random mGenerator = new Random();

/**
 * Class used for the client Binder.  Because we know this service always
 * runs in the same process as its clients, we don't need to deal with IPC.
 */
public class LocalBinder extends Binder {
    LocalService getService() {
        // Return this instance of LocalService so clients can call public methods
        return LocalService.this;
    }
}

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

/** method for clients */
public int getRandomNumber() {
  return mGenerator.nextInt(100);
  }
}

基本上，您应该在活动

onStart（）

中使用

bindService（）

，在

onStop（）中使用
unbindService（）

 public class LocalService extends Service {
    // Binder given to clients
   private final IBinder mBinder = new LocalBinder();
   // Random number generator
   private final Random mGenerator = new Random();

/**
 * Class used for the client Binder.  Because we know this service always
 * runs in the same process as its clients, we don't need to deal with IPC.
 */
public class LocalBinder extends Binder {
    LocalService getService() {
        // Return this instance of LocalService so clients can call public methods
        return LocalService.this;
    }
}

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

/** method for clients */
public int getRandomNumber() {
  return mGenerator.nextInt(100);
  }
}