Update and improve buildscript

app/build.gradle

@@ -1,28 +1,20 @@
 apply plugin: 'com.android.application'
-
-ext {
-    version_sdk = [
-            compileSdk: 27,
-            minSdk    : 17,
-    ]
-    version_lib = [
-            appcompat   : "27.0.0",
-            butterknife: "8.8.1",
-            netcipher   : "2.0.0-alpha1",
-    ]
+if (enable_plugin_kotlin) {
+    apply plugin: 'kotlin-android'
+    apply plugin: 'kotlin-android-extensions'
+    apply plugin: 'kotlin-kapt'
 }
 
-
 android {
-    compileSdkVersion version_sdk.compileSdk
+    compileSdkVersion version_setup_compileSdk
     flavorDimensions "default"
 
     defaultConfig {
-        minSdkVersion version_sdk.minSdk
-        targetSdkVersion version_sdk.compileSdk
+        minSdkVersion version_setup_minSdk
+        targetSdkVersion version_setup_targetSdk
         buildConfigField "boolean", "IS_TEST_BUILD", "false"
         buildConfigField "boolean", "IS_GPLAY_BUILD", "false"
-        buildConfigField("String[]", "APPLICATION_LANGUAGES", '{' + getUsedAndroidLanguages().collect {"\"${it}\""}.join(",")  + '}')
+        buildConfigField "String[]", "APPLICATION_LANGUAGES", "${getUsedAndroidLanguages()}"
         buildConfigField "String", "GITHASH", "\"${getGitHash()}\""
 
         applicationId "com.github.dfa.diaspora_android"
@@ -47,12 +39,18 @@ android {
         }
     }
 
+    sourceSets {
+        if (enable_plugin_kotlin) {
+            main.java.srcDirs += 'src/main/kotlin'
+        }
+    }
+
     productFlavors {
         flavorDefault {
         }
 
         /*
-flavorGplay {
+        flavorGplay {
             buildConfigField "boolean", "IS_GPLAY_BUILD", "true"
         }*/
         flavorTest {
@@ -78,19 +76,30 @@ dependencies {
     testImplementation 'junit:junit:4.12'
 
     // Android standard libs
-    implementation "com.android.support:appcompat-v7:${version_lib.appcompat}"
-    implementation "com.android.support:design:${version_lib.appcompat}"
-    implementation "com.android.support:support-v4:${version_lib.appcompat}"
-    implementation "com.android.support:customtabs:${version_lib.appcompat}"
-    implementation "com.android.support:cardview-v7:${version_lib.appcompat}"
+    implementation "com.android.support:appcompat-v7:${version_library_appcompat}"
+    implementation "com.android.support:design:${version_library_appcompat}"
+    implementation "com.android.support:support-v4:${version_library_appcompat}"
+    implementation "com.android.support:customtabs:${version_library_appcompat}"
+    implementation "com.android.support:cardview-v7:${version_library_appcompat}"
 
     // UI libraries
     implementation "com.github.DASAR:ShiftColorPicker:v0.5"
 
     // Tool libraries
-    implementation "com.jakewharton:butterknife:${version_lib.butterknife}"
-    implementation "info.guardianproject.netcipher:netcipher:${version_lib.netcipher}"
-    implementation "info.guardianproject.netcipher:netcipher-webkit:${version_lib.netcipher}"
+    implementation "info.guardianproject.netcipher:netcipher:${version_library_netcipher}"
+    implementation "info.guardianproject.netcipher:netcipher-webkit:${version_library_netcipher}"
+    implementation "com.jakewharton:butterknife:${version_library_butterknife}"
+    if (enable_plugin_kotlin) {
+        implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$version_plugin_kotlin"
+    }
 
-    annotationProcessor "com.jakewharton:butterknife-compiler:${version_lib.butterknife}"
+    // Processors
+    def anpros = ["com.jakewharton:butterknife-compiler:${version_library_butterknife}"]
+    for (anpro in anpros) {
+        if (enable_plugin_kotlin) {
+            kapt anpro
+        } else {
+            annotationProcessor anpro
+        }
+    }
 }

app/src/main/java/net/gsantner/opoc/ui/LanguagePreference.java

@@ -51,6 +51,7 @@ import android.content.Context;
 import android.os.Build;
 import android.preference.ListPreference;
 import android.support.annotation.Nullable;
+import android.text.TextUtils;
 import android.util.AttributeSet;
 
 import net.gsantner.opoc.util.ContextUtils;
@@ -155,7 +156,9 @@ public class LanguagePreference extends ListPreference {
     @Override
     public CharSequence getSummary() {
         Locale locale = new ContextUtils(getContext()).getLocaleByAndroidCode(getValue());
-        return super.getSummary() + "\n\n" + summarizeLocale(locale);
+        String prefix = TextUtils.isEmpty(super.getSummary())
+                ? "" : super.getSummary() + "\n\n";
+        return prefix + summarizeLocale(locale);
     }
 
     public String getSystemLanguageName() {

app/src/main/java/net/gsantner/opoc/util/ActivityUtils.java

@@ -12,8 +12,11 @@
 package net.gsantner.opoc.util;
 
 import android.app.Activity;
+import android.content.ActivityNotFoundException;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.net.Uri;
+import android.os.Build;
 import android.support.annotation.StringRes;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AlertDialog;
@@ -96,6 +99,13 @@ public class ActivityUtils extends net.gsantner.opoc.util.ContextUtils {
         }
     }
 
+    public void showSoftKeyboard() {
+        InputMethodManager inputMethodManager = (InputMethodManager) _activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
+        if (_activity.getCurrentFocus() != null && _activity.getCurrentFocus().getWindowToken() != null) {
+            inputMethodManager.showSoftInput(_activity.getCurrentFocus(), InputMethodManager.SHOW_FORCED);
+        }
+    }
+
     public void showDialogWithHtmlTextView(@StringRes int resTitleId, String html) {
         showDialogWithHtmlTextView(resTitleId, html, true, null);
     }
@@ -129,4 +139,18 @@ public class ActivityUtils extends net.gsantner.opoc.util.ContextUtils {
         }
         _activity.getWindow().setAttributes(attrs);
     }
+
+    public void showRateOnGplayDialog() {
+        String pkgId = "details?id=" + _activity.getPackageName();
+        Intent goToMarket = new Intent(Intent.ACTION_VIEW, Uri.parse("market://" + pkgId));
+        goToMarket.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY |
+                (Build.VERSION.SDK_INT >= 21 ? Intent.FLAG_ACTIVITY_NEW_DOCUMENT : Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) |
+                Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
+        try {
+            _activity.startActivity(goToMarket);
+        } catch (ActivityNotFoundException e) {
+            _activity.startActivity(new Intent(Intent.ACTION_VIEW,
+                    Uri.parse("http://play.google.com/store/apps/" + pkgId)));
+        }
+    }
 }

app/src/main/java/net/gsantner/opoc/util/ContextUtils.java

@@ -543,18 +543,4 @@ public class ContextUtils {
         }
         return this;
     }
-
-    public void showRateOnGplayDialog() {
-        String pkgId = "details?id=" + _context.getPackageName();
-        Intent goToMarket = new Intent(Intent.ACTION_VIEW, Uri.parse("market://" + pkgId));
-        goToMarket.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY |
-                (Build.VERSION.SDK_INT >= 21 ? Intent.FLAG_ACTIVITY_NEW_DOCUMENT : Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) |
-                Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
-        try {
-            _context.startActivity(goToMarket);
-        } catch (ActivityNotFoundException e) {
-            _context.startActivity(new Intent(Intent.ACTION_VIEW,
-                    Uri.parse("http://play.google.com/store/apps/" + pkgId)));
-        }
-    }
 }

build.gradle

@@ -1,6 +1,23 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.version_setup_compileSdk = 27
+    ext.version_setup_minSdk = 17
+    ext.version_setup_targetSdk = ext.version_setup_compileSdk
+    ext.version_setup_buildTools = "27.0.1" // Specifying optional
+
+    // https://developer.android.com/topic/libraries/support-library/revisions.html
+    ext.version_library_appcompat = "27.0.1"
+    // https://github.com/JakeWharton/butterknife/releases
+    ext.version_library_butterknife = "8.8.1"
+    // https://github.com/atlassian/commonmark-java/releases
+    ext.version_library_commonmark = "0.10.0"
+    // https://github.com/guardianproject/NetCipher/releases
+    ext.version_library_netcipher = "2.0.0-alpha1"
+    // https://github.com/JetBrains/kotlin/blob/master/ReadMe.md
+    ext.version_plugin_kotlin = "1.1.60"
+    ext.enable_plugin_kotlin = false
+
     repositories {
         jcenter()
         google()
@@ -8,6 +25,9 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.0'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
+        if (project.enable_plugin_kotlin) {
+            classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$version_plugin_kotlin"
+        }
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -27,15 +47,17 @@ task clean(type: Delete) {
     delete rootProject.buildDir
 }
 
-final String[] ROOT_TO_RAW_COPYFILES = ["README.md", "LICENSE.md", "CHANGELOG.md", "CONTRIBUTORS.md"]
+final String[] ROOT_TO_RAW_COPYFILES = ["README.md", "CHANGELOG.md", "CONTRIBUTORS.md","LICENSE.txt","LICENSE.md","LICENSE"]
 task copyRepoFiles(type: Copy) {
     from rootProject.files(ROOT_TO_RAW_COPYFILES)
     into "app/src/main/res/raw"
-    rename { String fileName -> fileName.replace(fileName, fileName.toLowerCase())  }
-} ; tasks.copyRepoFiles.execute()
+    rename { String fileName -> fileName.replace(fileName, fileName.toLowerCase()) }
+}; tasks.copyRepoFiles.execute()
+
 
 @SuppressWarnings(["UnnecessaryQualifiedReference", "SpellCheckingInspection", "GroovyUnusedDeclaration"])
-static String[] getUsedAndroidLanguages() {
+// Returns used android languages as a buildConfig array: {'de', 'it', ..}"
+static String getUsedAndroidLanguages() {
     Set<String> langs = new HashSet<>()
     new File('.').eachFileRecurse(groovy.io.FileType.DIRECTORIES) {
         final foldername = it.name
@@ -47,7 +69,7 @@ static String[] getUsedAndroidLanguages() {
             }
         }
     }
-    return langs.toArray(new String[langs.size()])
+    return '{' + langs.collect { "\"${it}\"" }.join(",") + '}'
 }
 
 ext.getGitHash = { ->