gps is :null on my Android phone ，but can get value on simulator

[zkbqhuang]

AndroidManifest.xml has

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

but still get null，hey guy，what's problem？