Add Settings screen

app/src/main/AndroidManifest.xml

@@ -45,6 +45,14 @@
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value="org.efidroid.efidroidmanager.activities.MainActivity" />
         </activity>
+        <activity
+            android:name=".activities.PrefActivity"
+            android:label="@string/action_settings"
+            android:theme="@style/AppTheme.ActionMode" >
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="org.efidroid.efidroidmanager.activities.MainActivity" />
+        </activity>
     </application>
 
 </manifest>

app/src/main/java/org/efidroid/efidroidmanager/AppConstants.java

@@ -1,11 +1,11 @@
 package org.efidroid.efidroidmanager;
 
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.os.Build;
-import android.text.TextUtils;
+import android.preference.PreferenceManager;
 
 import org.efidroid.efidroidmanager.models.DeviceInfo;
-import org.efidroid.efidroidmanager.types.SystemPropertiesProxy;
 
 public final class AppConstants {
     private static final String URL_EFIDROID_SERVER = "https://raw.githubusercontent.com/efidroid";
@@ -19,11 +19,8 @@ public final class AppConstants {
     public static final String PATH_INTERNAL_FSTAB = "fstab.multiboot";
 
     private static String getUrlServer(Context context) {
-        String url = SystemPropertiesProxy.get(context, "efidroid.server_url", "");
-        if (TextUtils.isEmpty(url))
-            url = URL_EFIDROID_SERVER;
-
-        return url;
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context.getApplicationContext());
+        return sp.getBoolean("use_custom_ota_server", false) ? sp.getString("ota_server_url", "") : URL_EFIDROID_SERVER;
     }
 
     public static String getUrlOta(Context context) {

app/src/main/java/org/efidroid/efidroidmanager/activities/MainActivity.java

@@ -485,6 +485,14 @@ public void onRefresh() {
             } else {
                 fragment = new InstallFragment();
             }
+        } else if (id == R.id.nav_settings) {
+            Intent i = new Intent(this, PrefActivity.class);
+            startActivity(i);
+
+            // close drawer
+            mDrawer.closeDrawer(GravityCompat.START);
+
+            return true;
         }
 
         mActiveMenuItemId = item.getItemId();

app/src/main/java/org/efidroid/efidroidmanager/activities/PrefActivity.java

@@ -0,0 +1,50 @@
+package org.efidroid.efidroidmanager.activities;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.os.Bundle;
+import android.preference.EditTextPreference;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+
+import org.efidroid.efidroidmanager.R;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class PrefActivity extends PreferenceActivity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        addPreferencesFromResource(R.xml.pref);
+        final Activity callingActivity = this;
+
+        EditTextPreference otaServerUrl = (EditTextPreference) getPreferenceScreen().findPreference("ota_server_url");
+        otaServerUrl.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object newValue) {
+                Boolean isValidUrl = true;
+                if (!validateHTTP_HTTPS_URI(newValue.toString())) {
+                    final AlertDialog.Builder builder = new AlertDialog.Builder(callingActivity);
+                    builder.setTitle(R.string.invalid_input);
+                    builder.setMessage(R.string.invalid_url_message);
+                    builder.setPositiveButton(android.R.string.ok, null);
+                    builder.show();
+                    isValidUrl = false;
+                }
+                return isValidUrl;
+            }
+        });
+    }
+
+    // valid url must have http or https schemes and non-empty host
+    private static boolean validateHTTP_HTTPS_URI(String uri) {
+        final URL url;
+        try {
+            url = new URL(uri);
+        } catch (MalformedURLException e) {
+            return false;
+        }
+        return ("http".equals(url.getProtocol()) || "https".equals(url.getProtocol())) && !"".equals(url.getHost());
+    }
+}

app/src/main/res/menu/activity_main_drawer.xml

@@ -33,6 +33,10 @@
             android:id="@+id/nav_install"
             android:icon="@drawable/ic_menu_settings"
             android:title="@string/install_update" />
+        <item
+            android:id="@+id/nav_settings"
+            android:icon="@drawable/ic_menu_settings"
+            android:title="@string/action_settings" />
     </group>
 
     <group android:id="@+id/nav_group_communicate">

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

@@ -125,4 +125,9 @@
     <string name="error_creating_system">Error creating system %1$s</string>
     <string name="error_updating_system">Error updating system %1$s</string>
     <string name="device_is_encrypted">Encrypted devices are not supported</string>
+    <string name="use_custom_ota_server">Use custom OTA server</string>
+    <string name="ota_server_url">Address of OTA server</string>
+    <string name="ota_settings">OTA Settings</string>
+    <string name="invalid_input">Invalid Input</string>
+    <string name="invalid_url_message">Server URL must have \"http\" or \"https\" scheme and contain non-empty hostname</string>
 </resources>

app/src/main/res/xml/pref.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    android:title="@string/app_name">
+    <PreferenceCategory
+        android:title="@string/ota_settings"
+        android:key="ota_settings">
+        <SwitchPreference
+            android:defaultValue="false"
+            android:title="@string/use_custom_ota_server"
+            android:key="use_custom_ota_server" />
+        <EditTextPreference
+            android:dependency="use_custom_ota_server"
+            android:defaultValue="http://hostname/"
+            android:selectAllOnFocus="false"
+            android:singleLine="true"
+            android:title="@string/ota_server_url"
+            android:key="ota_server_url"
+            android:inputType="textFilter" />
+    </PreferenceCategory>
+</PreferenceScreen>