Android 6.0 默认关闭定位和GPS，开启后默认选省电

frameworks/base/packages/SettingsProvider/res/values/defaults.xml

<string name="def_location_providers_allowed" translatable="false">network,gps</string>
修改为
<string name="def_location_providers_allowed" translatable="false"></string>

默认省电 修改位置

com/android/settings/location/LocationSettings.java

public class LocationSettings extends LocationSettingsBase
 @Override
 public void onSwitchChanged(Switch switchView, boolean isChecked) {
     if (isChecked) {
     //setLocationMode(android.provider.Settings.Secure.LOCATION_MODE_HIGH_ACCURACY);	
         setLocationMode(android.provider.Settings.Secure.LOCATION_MODE_BATTERY_SAVING);
     } else {
         setLocationMode(android.provider.Settings.Secure.LOCATION_MODE_OFF);
     }