Android在线手册

为方便起见，Roboguice针对Android平台常用的一些对象或服务提供了“标准注入”支持。比如无需使用(SensorManager) getSystemService(SENSOR_SERVICE) 来取得SensorManger 实例，而直接使用@Inject 标记

@Inject SensorManager sensorManager;

Roboguice 自动为sensorManager 注入所需SensorManger 对象， Roboguice支持的标准注入有如下：

@Inject ContentResolver contentResolver;
@Inject AssetManager assetManager;
@Inject Resources resources;
@Inject LocationManager locationManager;
@Inject WindowManager windowManager;
@Inject LayoutInflater layoutInflater;
@Inject ActivityManager activityManager;
@Inject PowerManager powerManager;
@Inject AlarmManager alarmManager;
@Inject NotificationManager notificationManager;
@Inject KeyguardManager keyguardManager;
@Inject SearchManager searchManager;
@Inject Vibrator vibrator;
@Inject ConnectivityManager connectivityManager;
@Inject WifiManager wifiManager;
@Inject InputMethodManager inputMethodManager;
@Inject SensorManager sensorManager;

我们使用SensorManager 为例，说明一下Standard Injection的用法，本例基于Android ApiDemos示例解析(90):OS->Sensors 。

修改

private SensorManager mSensorManager;

为

private @Inject
SensorManager mSensorManager;

去掉onCreate 中的

mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

运行实例，可以看出不用使用getSystemService，Roboguice自动为mSensorManager 赋了值。