Fixes #391 by requesting location permission if user want to use Local network (based on wifi SSID) feature for alternative local configuration.

app/build.gradle

@@ -8,8 +8,8 @@ android {
     defaultConfig {
         minSdkVersion 15
         targetSdkVersion 28
-        versionCode 234
+        versionCode 235
-        versionName '2.5.14'
+        versionName '2.5.15'
 
         javaCompileOptions {
             annotationProcessorOptions {

app/src/main/AndroidManifest.xml

@@ -29,10 +29,15 @@
 		android:xlargeScreens="true" />
 
 	<uses-permission android:name="android.permission.INTERNET" />
+	<!-- To check for an active connection -->
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<!-- To check currently connected wifi network name -->
 	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+	<uses-permission-sdk-23 android:name="android.permission.ACCESS_FINE_LOCATION" />
+	<!-- To start rss and torrents background check services -->
 	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 	<uses-permission android:name="android.permission.VIBRATE" />
+	<!-- To export settings file to external storage -->
 	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
 	<uses-feature

app/src/main/java/org/transdroid/core/gui/settings/InterceptableEditTextPreference.java

@@ -0,0 +1,47 @@
+package org.transdroid.core.gui.settings;
+
+import android.content.Context;
+import android.os.Build;
+import android.preference.EditTextPreference;
+import android.support.annotation.RequiresApi;
+import android.util.AttributeSet;
+
+public class InterceptableEditTextPreference extends EditTextPreference {
+
+	private OnPreferenceClickListener overrideClickListener = null;
+
+	@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
+	public InterceptableEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+		super(context, attrs, defStyleAttr, defStyleRes);
+	}
+
+	public InterceptableEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+	}
+
+	public InterceptableEditTextPreference(Context context, AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public InterceptableEditTextPreference(Context context) {
+		super(context);
+	}
+
+	@Override
+	public OnPreferenceClickListener getOnPreferenceClickListener() {
+		return overrideClickListener;
+	}
+
+	@Override
+	public void setOnPreferenceClickListener(OnPreferenceClickListener onPreferenceClickListener) {
+		this.overrideClickListener = onPreferenceClickListener;
+	}
+
+	@Override
+	protected void onClick() {
+		if (overrideClickListener == null || !overrideClickListener.onPreferenceClick(this)) {
+			super.onClick();
+		}
+	}
+
+}

app/src/main/java/org/transdroid/core/gui/settings/ServerSettingsActivity.java

@@ -26,14 +26,16 @@ import android.content.SharedPreferences;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.EditTextPreference;
+import android.preference.Preference;
 import android.preference.PreferenceManager;
-import android.text.TextUtils;
+import android.support.annotation.NonNull;
-
+import org.androidannotations.annotations.Bean;
 import org.androidannotations.annotations.EActivity;
 import org.androidannotations.annotations.OptionsItem;
 import org.androidannotations.annotations.OptionsMenu;
 import org.transdroid.R;
 import org.transdroid.core.app.settings.ApplicationSettings_;
+import org.transdroid.core.service.ConnectivityHelper;
 import org.transdroid.daemon.Daemon;
 
 /**
@@ -44,9 +46,12 @@ import org.transdroid.daemon.Daemon;
 @OptionsMenu(R.menu.activity_deleteableprefs)
 public class ServerSettingsActivity extends KeyBoundPreferencesActivity {
 
+	@Bean
+	protected ConnectivityHelper connectivityHelper;
+
 	private static final int DIALOG_CONFIRMREMOVE = 0;
 
-	private EditTextPreference extraPass, folder, downloadDir, excludeFilter, includeFilter;
+	private EditTextPreference extraPass, folder, downloadDir, excludeFilter, includeFilter, localNetworkPreference;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
@@ -63,7 +68,7 @@ public class ServerSettingsActivity extends KeyBoundPreferencesActivity {
 		initTextPreference("server_user");
 		initTextPreference("server_pass");
 		extraPass = initTextPreference("server_extrapass");
-		initTextPreference("server_localnetwork");
+		localNetworkPreference = initTextPreference("server_localnetwork");
 		initTextPreference("server_localaddress");
 		initTextPreference("server_localport");
 		folder = initTextPreference("server_folder");
@@ -83,6 +88,16 @@ public class ServerSettingsActivity extends KeyBoundPreferencesActivity {
 		initTextPreference("server_ssltrustkey", null, "server_sslenabled");
 		onPreferencesChanged();
 
+		localNetworkPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+			@Override
+			public boolean onPreferenceClick(final Preference preference) {
+				if (!connectivityHelper.hasNetworkNamePermission(ServerSettingsActivity.this)) {
+					connectivityHelper.askNetworkNamePermission(ServerSettingsActivity.this);
+					return true;
+				}
+				return false;
+			}
+		});
 	}
 
 	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@@ -113,6 +128,13 @@ public class ServerSettingsActivity extends KeyBoundPreferencesActivity {
 		return null;
 	}
 
+	@Override
+	public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+		if (connectivityHelper.requestedPermissionWasGranted(requestCode, permissions, grantResults)) {
+			localNetworkPreference.getOnPreferenceClickListener().onPreferenceClick(localNetworkPreference);
+		}
+	}
+
 	@Override
 	protected void onPreferencesChanged() {
 

app/src/main/java/org/transdroid/core/service/ConnectivityHelper.java

@@ -16,17 +16,26 @@
  */
 package org.transdroid.core.service;
 
-import org.androidannotations.annotations.EBean;
+import android.Manifest;
-import org.androidannotations.annotations.SystemService;
+import android.app.Activity;
-import org.androidannotations.annotations.EBean.Scope;
-
 import android.content.Context;
+import android.content.DialogInterface;
+import android.content.pm.PackageManager;
 import android.net.ConnectivityManager;
 import android.net.wifi.WifiManager;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.AlertDialog;
+import org.androidannotations.annotations.EBean;
+import org.androidannotations.annotations.EBean.Scope;
+import org.androidannotations.annotations.SystemService;
+import org.transdroid.R;
 
 @EBean(scope = Scope.Singleton)
 public class ConnectivityHelper {
 
+	private static final int REQUEST_LOCATION_PERMISSION = 0;
+
 	@SystemService
 	protected ConnectivityManager connectivityManager;
 	@SystemService
@@ -39,10 +48,39 @@ public class ConnectivityHelper {
 	}
 
 	public String getConnectedNetworkName() {
-		if (wifiManager.getConnectionInfo() != null && wifiManager.getConnectionInfo().getSSID() != null) {
+		if (wifiManager != null && wifiManager.getConnectionInfo() != null && wifiManager.getConnectionInfo().getSSID() != null) {
 			return wifiManager.getConnectionInfo().getSSID().replace("\"", "");
 		}
 		return null;
 	}
 
+	public boolean hasNetworkNamePermission(final Context activityContext) {
+		return ContextCompat.checkSelfPermission(activityContext, Manifest.permission.ACCESS_FINE_LOCATION) ==
+				PackageManager.PERMISSION_GRANTED;
+	}
+
+	public void askNetworkNamePermission(final Activity activity) {
+		new AlertDialog.Builder(activity)
+				.setTitle(R.string.pref_local_permission_title)
+				.setMessage(activity.getString(R.string.pref_local_permission_rationale,
+						activity.getString(R.string.app_name)))
+				.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+					@Override
+					public void onClick(DialogInterface dialog, int which) {
+						ActivityCompat.requestPermissions(activity,
+								new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_PERMISSION);
+					}
+				})
+				.setNegativeButton(android.R.string.cancel, null)
+				.show();
+	}
+
+	public boolean requestedPermissionWasGranted(int requestCode, String[] permissions, int[] grantResults) {
+		return (requestCode == REQUEST_LOCATION_PERMISSION
+				&& permissions != null
+				&& grantResults != null
+				&& permissions[0].equals(Manifest.permission.ACCESS_FINE_LOCATION)
+				&& grantResults[0] == PackageManager.PERMISSION_GRANTED);
+	}
+
 }

app/src/main/res/values/changelog.xml

@@ -18,6 +18,7 @@
 <resources>
 <string name="system_changelog">
 Transdroid 2.5.15\n
+- Support local network config on Android 8.1+ by asking for location permission\n
 - Hacky fix to prevent crashes on > 1000 torrents\n
 - Fix crashes during background or config changes\n
 - Removed donate link in Transdrone\n

app/src/main/res/values/strings.xml

@@ -270,6 +270,8 @@
 	<string name="pref_localport">Local port number</string>
 	<string name="pref_localnetwork">Local network</string>
 	<string name="pref_localnetwork_info">The server\'s local network SSID</string>
+	<string name="pref_local_permission_title">Location permission</string>
+	<string name="pref_local_permission_rationale">To known the connected Wifi network SSID name, %1$s requires the location permission</string>
 	<string name="pref_folder">Folder</string>
 	<string name="pref_folder_info">Usually empty</string>
 	<string name="pref_scgifolder">SCGI mount point</string>

app/src/main/res/xml/pref_server.xml

@@ -15,7 +15,8 @@
   You should have received a copy of the GNU General Public License
   along with Transdroid.  If not, see <http://www.gnu.org/licenses/>.
 -->
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+				  xmlns:app="http://schemas.android.com/apk/res-auto" >
 
 	<EditTextPreference
 		android:key="server_name"
@@ -49,7 +50,7 @@
 			android:key="server_port"
 			android:title="@string/pref_port"
 			android:inputType="numberSigned" />
-		<EditTextPreference
+		<org.transdroid.core.gui.settings.InterceptableEditTextPreference
 			android:key="server_localnetwork"
 			android:title="@string/pref_localnetwork"
 			android:summary="@string/pref_localnetwork_info"