内部类：不公开，不能从外部包访问

Question

我在一个包 (packageShared) 中有一个 GpsService，我需要从另一个包 (packageClient) 访问它。我得到“getService（）在'packageShared.GpsService.Localbinder'中不是公共的。无法从外部包访问。”在以下行 mService = (GpsService) binder.getService();在 Android Studio。

我在包内有另一个类使用相同的代码共享效果很好。

这里是packageClient上的代码：

    // Monitors the state of the connection to the service.
private final ServiceConnection mServiceConnection = new ServiceConnection() {

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        GpsService.LocalBinder binder = (GpsService.LocalBinder) service;
        mService = (GpsService) binder.getService();
        mBound = true;

    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        mService = null;
        mBound = false;
    }
};

这是 packageShared 上的代码：

public class GpsService extends Service {


    public GpsService() {
    }

    other methods here...

    /**
     * Class used for the client Binder.  Since this service runs in the same process as its
     * clients, we don't need to deal with IPC.
     */
    public class LocalBinder extends Binder {
        GpsService getService() {
            return GpsService.this;
        }
    }
}

提前谢谢你。

Answer 1

这是因为您的 getService() 方法是包可见的。您需要将其设为 public 才能从其他包中访问它：

public class LocalBinder extends Binder {
    public GpsService getService() {   //<-- The public keyword is added
        return GpsService.this;
    }
}