From 08b40e81c62420e977e82189482fc07c0d6ace31 Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Sun, 14 May 2023 23:00:00 +0200
Subject: menu / settings

---
 Readme.md                              |  5 ++-
 app/java/res/layout/main.xml           |  1 -
 app/java/res/layout/settings.xml       | 26 ---------------
 app/java/res/xml/settings.xml          | 30 +++++++++++++++++
 app/java/src/MainActivity.java         | 61 +++++++++++++++++++++++++++-------
 app/java/src/SettingsActivity.java     | 22 ++++++++++--
 app/java/src/WifiListenerReceiver.java |  4 +--
 7 files changed, 105 insertions(+), 44 deletions(-)
 delete mode 100644 app/java/res/layout/settings.xml
 create mode 100644 app/java/res/xml/settings.xml

diff --git a/Readme.md b/Readme.md
index 0d4f515..9e6fbd6 100644
--- a/Readme.md
+++ b/Readme.md
@@ -22,6 +22,9 @@
 - https://developer.android.com/guide/background/persistent/getting-started
 - https://developer.android.com/reference/android/net/ConnectivityManager.NetworkCallback
 
-### Menu
+### Menu / Settings
 - https://medium.com/@bhavyakaria/step-by-step-guide-to-create-app-settings-using-preferences-in-android-part-1-fa470305b530
 - https://code.tutsplus.com/tutorials/how-to-code-a-settings-screen-in-an-android-app--cms-30433
+- https://www.geeksforgeeks.org/how-to-implement-preferences-settings-screen-in-android/
+- https://google-developer-training.github.io/android-developer-fundamentals-course-practicals/en/Unit%204/92_p_adding_settings_to_an_app.html
+- https://github.com/google-developer-training/android-fundamentals/tree/master/DroidCafeWithSettings
diff --git a/app/java/res/layout/main.xml b/app/java/res/layout/main.xml
index 1658965..cc1780c 100644
--- a/app/java/res/layout/main.xml
+++ b/app/java/res/layout/main.xml
@@ -19,7 +19,6 @@
     />
 
     <Button
-        style="@style/button_start__start"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:id="@+id/button_start"
diff --git a/app/java/res/layout/settings.xml b/app/java/res/layout/settings.xml
deleted file mode 100644
index 5ba8c78..0000000
--- a/app/java/res/layout/settings.xml
+++ /dev/null
@@ -1,26 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<FrameLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:paddingLeft="@dimen/activity_horizontal_margin"
-    android:paddingRight="@dimen/activity_horizontal_margin"
-    android:paddingTop="@dimen/activity_vertical_margin"
-    android:paddingBottom="@dimen/activity_vertical_margin"
-    android:orientation="vertical"
-    tools:context=".SettingsActivity"
->
-
-    <TextureView
-        android:layout_width="fill_parent"
-        android:layout_height="wrap_content"
-        android:id="@+id/surface_view"
-    />
-
-    <!-- USE_WIFI_LISTENER -->
-    <!-- SELECT_FROM_KNOWN_SSIDS -->
-
-    <!-- USE_AUTOMATIC_DNS/PIHOLE_SERVER_DISCOVERY -->
-    <!-- SET_MANUAL_DNS/PIHOLE_SERVER_IP -->
-</FrameLayout>
diff --git a/app/java/res/xml/settings.xml b/app/java/res/xml/settings.xml
new file mode 100644
index 0000000..ea44ce0
--- /dev/null
+++ b/app/java/res/xml/settings.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+>
+    <SwitchPreference
+        android:key="use_automatic_dns_server_discovery"
+        android:defaultValue="true"
+        android:title="Use automatic DNS Server / Pihole discovery"
+        android:summary="Whether to use the automatic discovery mechanism to set the DNS server"
+    />
+
+    <SwitchPreference
+        android:key="use_wifi_listener"
+        android:defaultValue="false"
+        android:title="Use WiFi listener"
+        android:summary="Automatically de/activates the proxy on WiFi dis/connect"
+    />
+
+    <!-- USE_WIFI_LISTENER -->
+    <!-- SELECT_FROM_KNOWN_SSIDS -->
+    <!-- <MultiSelectListPreference -->
+    <!--     android:id="@+id/known_ssids" -->
+    <!--     android:key="known_ssids" -->
+    <!--     android:entries="" -->
+    <!--     android:entryValues="" -->
+    <!-- /> -->
+
+    <!-- USE_AUTOMATIC_DNS/PIHOLE_SERVER_DISCOVERY -->
+    <!-- SET_MANUAL_DNS/PIHOLE_SERVER_IP -->
+</PreferenceScreen>
diff --git a/app/java/src/MainActivity.java b/app/java/src/MainActivity.java
index bfad05a..6d232b9 100644
--- a/app/java/src/MainActivity.java
+++ b/app/java/src/MainActivity.java
@@ -7,11 +7,17 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
 
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
 import android.net.VpnService;
+import android.net.wifi.WifiManager;
 
 import android.os.Bundle;
 
+import android.preference.PreferenceManager;
+
 import android.util.Log;
 
 import android.view.Menu;
@@ -29,7 +35,7 @@ public class MainActivity extends Activity {
     private Button buttonStart;
     private Intent dnsProxyService;
 
-    private BroadcastReceiver receiver = new BroadcastReceiver() {
+    private BroadcastReceiver receiveDNSProxyService = new BroadcastReceiver() {
 
         /**
          * Set button_start state on receive from DNSProxyService
@@ -40,6 +46,17 @@ public class MainActivity extends Activity {
         }
     };
 
+    private BroadcastReceiver receiveNetworkChange = new BroadcastReceiver() {
+
+        /**
+         * Set button_start state on receive of network change
+         */
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            setStateButtonStart();
+        }
+    };
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -48,9 +65,6 @@ public class MainActivity extends Activity {
 
         this.buttonStart = (Button) findViewById(R.id.button_start);
         this.dnsProxyService = new Intent(this, DNSProxyService.class);
-
-        // if setting.get(USER_WIFI_LISTENER)
-        // startService(new Intent(this, WifiListenerService.class));
     }
 
     @Override
@@ -58,14 +72,17 @@ public class MainActivity extends Activity {
         super.onResume();
 
         this.setStateButtonStart();
-        registerReceiver(this.receiver, new IntentFilter(DNSProxyService.NOTIFICATION));
+        this.toggleWifiListenerService();
+        registerReceiver(this.receiveDNSProxyService, new IntentFilter(DNSProxyService.NOTIFICATION));
+        registerReceiver(this.receiveNetworkChange, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION));
     }
 
     @Override
     public void onPause() {
         super.onPause();
 
-        unregisterReceiver(receiver);
+        unregisterReceiver(this.receiveDNSProxyService);
+        unregisterReceiver(this.receiveNetworkChange);
     }
 
     @Override
@@ -96,7 +113,7 @@ public class MainActivity extends Activity {
     @Override
     public void onActivityResult(int request, int result, Intent data) {
         if (result == RESULT_OK) {
-          this.start();
+          this.startDNSProxyService();
         }
     }
 
@@ -114,25 +131,35 @@ public class MainActivity extends Activity {
             }
         }
         else { // stop
-            this.stop();
+            this.stopDNSProxyService();
         }
     }
 
     /**
-     * Set button_start text
+     * Set button_start state
      */
-    public void setStateButtonStart() {
+    private void setStateButtonStart() {
+        // change text
         if (!DNSProxyService.isRunning()) {
             this.buttonStart.setText(getString(R.string.button_start__start));
         } else {
             this.buttonStart.setText(getString(R.string.button_start__stop));
         }
+
+        // toggle enabled
+        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
+        if (networkInfo.isConnected() || DNSProxyService.isRunning()) {
+            this.buttonStart.setEnabled(true);
+        } else if (!networkInfo.isConnected() && !DNSProxyService.isRunning()) {
+            this.buttonStart.setEnabled(false);
+        }
     }
 
     /**
      * Start DNSProxyService
      */
-    public void start() {
+    private void startDNSProxyService() {
         startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_START));
 
         Toast
@@ -147,7 +174,7 @@ public class MainActivity extends Activity {
     /**
      * Stop DNSProxyService
      */
-    public void stop() {
+    private void stopDNSProxyService() {
         startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_STOP));
 
         Toast
@@ -158,4 +185,14 @@ public class MainActivity extends Activity {
             )
             .show();
     }
+
+    private void toggleWifiListenerService() {
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+
+        if (sharedPreferences.getBoolean("use_wifi_listener", false)) {
+            startService(new Intent(this, WifiListenerService.class));
+        } else {
+            stopService(new Intent(this, WifiListenerService.class));
+        }
+    }
 }
diff --git a/app/java/src/SettingsActivity.java b/app/java/src/SettingsActivity.java
index 83e2661..c71693a 100644
--- a/app/java/src/SettingsActivity.java
+++ b/app/java/src/SettingsActivity.java
@@ -12,6 +12,10 @@ import android.net.VpnService;
 
 import android.os.Bundle;
 
+import android.preference.MultiSelectListPreference;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceFragment;
+
 import android.util.Log;
 
 import android.view.Menu;
@@ -24,13 +28,17 @@ import android.widget.Button;
 import android.widget.Toast;
 import android.provider.Settings;
 
-public class SettingsActivity extends Activity {
+import java.util.List;
+
+public class SettingsActivity extends PreferenceActivity {
+
+    private MultiSelectListPreference knownSsids;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        setContentView(R.layout.settings);
+        getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
 
         // if (setting.get(USE_WIFI_LISTENER))
         // requestPermissions(new String[]{
@@ -38,4 +46,14 @@ public class SettingsActivity extends Activity {
         // }, 1234);
         // startService(WifiListenerService);
     }
+
+    public static class SettingsFragment extends PreferenceFragment {
+
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            addPreferencesFromResource(R.xml.settings);
+        }
+    }
 }
diff --git a/app/java/src/WifiListenerReceiver.java b/app/java/src/WifiListenerReceiver.java
index ca22965..d34df2b 100644
--- a/app/java/src/WifiListenerReceiver.java
+++ b/app/java/src/WifiListenerReceiver.java
@@ -25,7 +25,7 @@ public class WifiListenerReceiver extends BroadcastReceiver
         // start
         if (networkInfo.getState().equals(NetworkInfo.State.CONNECTED)) {
             // wait a few moments for wifi to be fully there
-            (new Handler()).postDelayed(new Runnable() {
+            /* (new Handler()).postDelayed(new Runnable() {
                 @Override
                 public void run() {
                     WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
@@ -35,7 +35,7 @@ public class WifiListenerReceiver extends BroadcastReceiver
 
                     context.startService(dnsProxyService.setAction(DNSProxyService.ACTION_START));
                 }
-            }, 1000);
+            }, 1000); */
         }
 
         // stop
-- 
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