Add links and comply with GPL

build.gradle

@@ -1,9 +1,7 @@
 import com.android.build.gradle.AppExtension
 import com.android.build.gradle.api.ApkVariantOutput
 import com.android.build.gradle.api.ApplicationVariant
-
+import com.github.jk1.license.render.TextReportRenderer
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
 
 buildscript {
     ext.kotlin_version = '1.4.21'
@@ -19,6 +17,14 @@ buildscript {
     }
 }
 
+plugins {
+    id 'com.github.jk1.dependency-license-report' version '1.16'
+}
+def licenseResDir = new File("$projectDir/build/dependency-license-res")
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
 android {
     compileSdkVersion 29
     defaultConfig {
@@ -49,7 +55,7 @@ android {
             manifest.srcFile 'AndroidManifest.xml'
             java.srcDirs = ['src']
             resources.srcDirs = ['resources']
-            res.srcDirs = ['res']
+            res.srcDirs = ['res', licenseResDir]
             assets.srcDirs = ['assets']
         }
         test {
@@ -203,3 +209,16 @@ repositories {
     google()
     mavenCentral()
 }
+
+licenseReport {
+    configurations = ALL
+    renderers = [new TextReportRenderer()]
+}
+generateLicenseReport.doLast {
+    def target = new File(licenseResDir, "raw/license")
+    target.parentFile.mkdirs()
+    target.text =
+            files("COPYING", "$projectDir/build/reports/dependency-license/THIRD-PARTY-NOTICES.txt")
+                    .collect { it.getText() }.join('\n')
+}
+preBuild.dependsOn(generateLicenseReport)

res/drawable/ic_baseline_attach_money_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M11.8,10.9c-2.27,-0.59 -3,-1.2 -3,-2.15 0,-1.09 1.01,-1.85 2.7,-1.85 1.78,0 2.44,0.85 2.5,2.1h2.21c-0.07,-1.72 -1.12,-3.3 -3.21,-3.81V3h-3v2.16c-1.94,0.42 -3.5,1.68 -3.5,3.61 0,2.31 1.91,3.46 4.7,4.13 2.5,0.6 3,1.48 3,2.41 0,0.69 -0.49,1.79 -2.7,1.79 -2.06,0 -2.87,-0.92 -2.98,-2.1h-2.2c0.12,2.19 1.76,3.42 3.68,3.83V21h3v-2.15c1.95,-0.37 3.5,-1.5 3.5,-3.55 0,-2.84 -2.43,-3.81 -4.7,-4.4z"/>
+</vector>

res/drawable/ic_baseline_bug_report_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M20,8h-2.81c-0.45,-0.78 -1.07,-1.45 -1.82,-1.96L17,4.41 15.59,3l-2.17,2.17C12.96,5.06 12.49,5 12,5c-0.49,0 -0.96,0.06 -1.41,0.17L8.41,3 7,4.41l1.62,1.63C7.88,6.55 7.26,7.22 6.81,8L4,8v2h2.09c-0.05,0.33 -0.09,0.66 -0.09,1v1L4,12v2h2v1c0,0.34 0.04,0.67 0.09,1L4,16v2h2.81c1.04,1.79 2.97,3 5.19,3s4.15,-1.21 5.19,-3L20,18v-2h-2.09c0.05,-0.33 0.09,-0.66 0.09,-1v-1h2v-2h-2v-1c0,-0.34 -0.04,-0.67 -0.09,-1L20,10L20,8zM14,16h-4v-2h4v2zM14,12h-4v-2h4v2z"/>
+</vector>

res/drawable/ic_baseline_code_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M9.4,16.6L4.8,12l4.6,-4.6L8,6l-6,6 6,6 1.4,-1.4zM14.6,16.6l4.6,-4.6 -4.6,-4.6L16,6l6,6 -6,6 -1.4,-1.4z"/>
+</vector>

res/drawable/ic_baseline_gavel_24.xml

@@ -0,0 +1,19 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M5.2496,8.0688l2.83,-2.8268l14.134,14.15l-2.83,2.8268z"/>
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M9.4857,3.8272l2.828,-2.8288l5.6576,5.656l-2.828,2.8288z"/>
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M0.9989,12.3147l2.8284,-2.8284l5.6568,5.6568l-2.8284,2.8284z"/>
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M1,21h12v2h-12z"/>
+</vector>

res/values/strings.xml

@@ -420,5 +420,12 @@
       <item>light</item>
       <item>dark</item>
     </string-array>
+    <string name="report_bug">Report Bug</string>
+    <string name="report_bug_url" translatable="false">https://bugs.kde.org/enter_bug.cgi?product=kdeconnect&amp;component=android-application</string>
+    <string name="donate">Donate</string>
+    <string name="donate_url" translatable="false">https://kde.org/community/donations/?app=kdeconnect-android</string>
+    <string name="source_code">Source Code</string>
+    <string name="source_code_url" translatable="false">https://invent.kde.org/network/kdeconnect-android/</string>
+    <string name="licenses">Licenses</string>
 
 </resources>

src/org/kde/kdeconnect/UserInterface/SettingsFragment.java

@@ -1,9 +1,11 @@
 package org.kde.kdeconnect.UserInterface;
 
+import android.app.AlertDialog;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.Configuration;
 import android.graphics.Color;
+import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.text.TextUtils;
@@ -18,13 +20,45 @@ import androidx.preference.ListPreference;
 
 import com.google.android.material.snackbar.Snackbar;
 
+import org.apache.commons.io.IOUtils;
 import org.kde.kdeconnect.BackgroundService;
 import org.kde.kdeconnect.Helpers.DeviceHelper;
 import org.kde.kdeconnect.Helpers.NotificationHelper;
 import org.kde.kdeconnect_tp.R;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.Charset;
+
 public class SettingsFragment extends PreferenceFragmentCompat {
 
+    private static class LicenseTextSingleton {
+        private static volatile String licenseText;
+
+        // Need these separate methods because Context is required to load the string
+        // Mixing Context and static here is fine because the license
+        // is a pure function of the project directory (i.e. doesn't depend on language, etc.)
+
+        static synchronized String getOrLoadLicenseText(Context context) {
+            String licenseText = LicenseTextSingleton.licenseText;
+            if (licenseText != null) {
+                return licenseText;
+            }
+            try (InputStream is = context.getResources().openRawResource(R.raw.license)) {
+                licenseText = IOUtils.toString(is, Charset.defaultCharset());
+            } catch (IOException ie) {
+                throw new RuntimeException(ie);
+            }
+            return LicenseTextSingleton.licenseText = licenseText;
+        }
+
+        static synchronized void startLoadingLicenseText(Context context) {
+            if (licenseText == null) {
+                new Thread(() -> getOrLoadLicenseText(context)).start();
+            }
+        }
+    }
+
     private EditTextPreference renameDevice;
 
     @Override
@@ -153,6 +187,40 @@ public class SettingsFragment extends PreferenceFragmentCompat {
         moreSettingsText.setSummary(R.string.settings_more_settings_text);
         screen.addPreference(moreSettingsText);
 
+        Preference bug = new Preference(context);
+        bug.setTitle(R.string.report_bug);
+        bug.setPersistent(false);
+        bug.setIcon(R.drawable.ic_baseline_bug_report_24);
+        bug.setIntent(new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.report_bug_url))));
+        screen.addPreference(bug);
+
+        Preference donate = new Preference(context);
+        donate.setTitle(R.string.donate);
+        donate.setPersistent(false);
+        donate.setIcon(R.drawable.ic_baseline_attach_money_24);
+        donate.setIntent(new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.donate_url))));
+        screen.addPreference(donate);
+
+        Preference source = new Preference(context);
+        source.setTitle(R.string.source_code);
+        source.setPersistent(false);
+        source.setIcon(R.drawable.ic_baseline_code_24);
+        source.setIntent(new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.source_code_url))));
+        screen.addPreference(source);
+
+        Preference licences = new Preference(context);
+        licences.setTitle(R.string.licenses);
+        licences.setPersistent(false);
+        licences.setIcon(R.drawable.ic_baseline_gavel_24);
+        licences.setOnPreferenceClickListener(preference -> {
+            new AlertDialog.Builder(context)
+                    .setMessage(LicenseTextSingleton.getOrLoadLicenseText(context))
+                    .create().show();
+            return true;
+        });
+        LicenseTextSingleton.startLoadingLicenseText(context);
+        screen.addPreference(licences);
+
         setPreferenceScreen(screen);