可以使用 public abstract
boolean hasSystemFeature (String name)
判断是否支持下列某个属性：
FEATURE_AUDIO_LOW_LATENCY
FEATURE_BLUETOOTH
FEATURE_CAMERA
FEATURE_CAMERA_AUTOFOCUS
FEATURE_CAMERA_FLASH
FEATURE_CAMERA_FRONT
FEATURE_FAKETOUCH
FEATURE_FAKETOUCH_MULTITOUCH_DISTINCT
FEATURE_FAKETOUCH_MULTITOUCH_JAZZHAND
FEATURE_LIVE_WALLPAPER
FEATURE_LOCATION
FEATURE_LOCATION_GPS
FEATURE_LOCATION_NETWORK
FEATURE_MICROPHONE
FEATURE_NFC
FEATURE_SCREEN_LANDSCAPE
FEATURE_SCREEN_PORTRAIT
FEATURE_SENSOR_ACCELEROMETER
FEATURE_SENSOR_BAROMETER
FEATURE_SENSOR_COMPASS Feature
FEATURE_SENSOR_GYROSCOPE
FEATURE_SENSOR_LIGHT
FEATURE_SENSOR_PROXIMITY
FEATURE_SIP
FEATURE_SIP_VOIP
FEATURE_TELEPHONY
FEATURE_TELEPHONY_CDMA
FEATURE_TELEPHONY_GSM
FEATURE_TOUCHSCREEN
FEATURE_TOUCHSCREEN_MULTITOUCH
FEATURE_TOUCHSCREEN_MULTITOUCH_DISTINCT
FEATURE_TOUCHSCREEN_MULTITOUCH_JAZZHAND
FEATURE_USB_ACCESSORY
FEATURE_USB_HOST
FEATURE_WIFI
FEATURE_WIFI_DIRECT
在应用程序中使用方法
if(!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_LOCATION_GPS)){
/**/
}
还可以用 getSystemAvailableFeatures ()列出当前设备所有属性。
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对于设备端来说，是否支持这些feature,就要放各种.xml文件到 /system/etc/permissions下面
诸如：
android.hardware.camera.front.xml
android.hardware.location.gps.xml
android.hardware.sensor.accelerometer.xml
android.hardware.telephony.gsm.xml
android.hardware.touchscreen.multitouch.jazzhand.xml
android.hardware.usb.accessory.xml
android.hardware.wifi.xml
等等
这些文件存在于frameworks/base/data/etc
修改Android.mk就可把他们放到/system/etc/permissions里面去了。
这可以解决Google market(现在叫做play)里面显示应用较少的问题。