privatevoid turnGPSOn(){String provider = android.provider.Settings.Secure.getString(
            getContentResolver(),
            android.provider.Settings.Secure.LOCATION_PROVIDERS_ALLOWED);if(!provider.contains("gps")){// if gps is disabledfinalIntent poke =newIntent();
        poke.setClassName("com.android.settings","com.android.settings.widget.SettingsAppWidgetProvider");
        poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
        poke.setData(Uri.parse("3"));
        sendBroadcast(poke);}}

上面代码在Android5.0上好像不能用。不知道哪个大神，知道如何在Android5.0上强制开关GPS啊。