Ladybird/Meta: Add Android build

Build an Android APK file that, when configured properly in Qt Creator,
can be used to deploy the browser to an Android device.

The current build requires NDK 24, targets no less than Android API 30,
and Qt Creator 6.4.0.

Ladybird/android/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.serenityos.ladybird" android:installLocation="auto" android:versionCode="001" android:versionName="head">
+    <!-- %%INSERT_PERMISSIONS -->
+    <!-- %%INSERT_FEATURES -->
+    <supports-screens android:anyDensity="true" android:largeScreens="true" android:normalScreens="true" android:smallScreens="true"/>
+    <application android:name="org.qtproject.qt.android.bindings.QtApplication" android:hardwareAccelerated="true" android:label="ladybird" android:requestLegacyExternalStorage="true" android:allowNativeHeapPointerTagging="false" android:allowBackup="true" android:fullBackupOnly="false" android:enableOnBackInvokedCallback="true">
+        <activity android:name="org.qtproject.qt.android.bindings.QtActivity" android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density" android:label="ladybird" android:launchMode="singleTop" android:screenOrientation="unspecified" android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+            <meta-data android:name="android.app.lib_name" android:value="-- %%INSERT_APP_LIB_NAME%% --"/>
+            <meta-data android:name="android.app.arguments" android:value="-- %%INSERT_APP_ARGUMENTS%% --"/>
+            <meta-data android:name="android.app.extract_android_style" android:value="minimal"/>
+        </activity>
+    </application>
+<uses-permission android:name="android.permission.INTERNET"/>
+<uses-permission android:name="com.android.browser.permission.READ_HISTORY_BOOKMARKS"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+</manifest>

Ladybird/android/build.gradle

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+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.0.2'
+    }
+}
+
+repositories {
+    google()
+    mavenCentral()
+}
+
+apply plugin: 'com.android.application'
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
+}
+
+android {
+    /*******************************************************
+     * The following variables:
+     * - androidBuildToolsVersion,
+     * - androidCompileSdkVersion
+     * - qtAndroidDir - holds the path to qt android files
+     *                   needed to build any Qt application
+     *                   on Android.
+     *
+     * are defined in gradle.properties file. This file is
+     * updated by QtCreator and androiddeployqt tools.
+     * Changing them manually might break the compilation!
+     *******************************************************/
+
+    compileSdkVersion androidCompileSdkVersion.toInteger()
+    buildToolsVersion androidBuildToolsVersion
+    ndkVersion androidNdkVersion
+
+    // Extract native libraries from the APK
+    packagingOptions.jniLibs.useLegacyPackaging true
+
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = [qtAndroidDir + '/src', 'src', 'java']
+            aidl.srcDirs = [qtAndroidDir + '/src', 'src', 'aidl']
+            res.srcDirs = [qtAndroidDir + '/res', 'res']
+            resources.srcDirs = ['resources']
+            renderscript.srcDirs = ['src']
+            assets.srcDirs = ['assets']
+            jniLibs.srcDirs = ['libs']
+       }
+    }
+
+    tasks.withType(JavaCompile) {
+        options.incremental = true
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    lintOptions {
+        abortOnError false
+    }
+
+    // Do not compress Qt binary resources file
+    aaptOptions {
+        noCompress 'rcc'
+    }
+
+    defaultConfig {
+        resConfig "en"
+        minSdkVersion qtMinSdkVersion
+        targetSdkVersion qtTargetSdkVersion
+        ndk.abiFilters = qtTargetAbiList.split(",")
+    }
+}

Ladybird/android/gradle.properties

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+# Project-wide Gradle settings.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2500m -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+
+# Enable building projects in parallel
+org.gradle.parallel=true
+
+# Gradle caching allows reusing the build artifacts from a previous
+# build with the same inputs. However, over time, the cache size will
+# grow. Uncomment the following line to enable it.
+#org.gradle.caching=true

Ladybird/android/res/values/libs.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<resources>
+    <!-- DO NOT EDIT THIS: This file is populated automatically by the deployment tool. -->
+
+    <array name="bundled_libs">
+        <!-- %%INSERT_EXTRA_LIBS%% -->
+    </array>
+
+    <array name="qt_libs">
+        <!-- %%INSERT_QT_LIBS%% -->
+    </array>
+
+    <array name="load_local_libs">
+        <!-- %%INSERT_LOCAL_LIBS%% -->
+    </array>
+
+    <string name="static_init_classes"><!-- %%INSERT_INIT_CLASSES%% --></string>
+    <string name="use_local_qt_libs"><!-- %%USE_LOCAL_QT_LIBS%% --></string>
+    <string name="bundle_local_qt_libs"><!-- %%BUNDLE_LOCAL_QT_LIBS%% --></string>
+    <string name="system_libs_prefix"><!-- %%SYSTEM_LIBS_PREFIX%% --></string>
+</resources>

Ladybird/android/src/org/serenityos/ladybird/TransferAssets.java

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+/**
+ * Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+package org.serenityos.ladybird;
+
+import android.content.Context;
+import android.content.res.AssetManager;
+import android.util.Log;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import java.lang.String;
+
+public class TransferAssets
+{
+    /**
+        @returns new ladybird resource root
+    */
+    static public String transferAssets(Context context)
+    {
+       Log.d("Ladybird", "Hello from java");
+       Context applicationContext = context.getApplicationContext();
+       File assetDir = applicationContext.getFilesDir();
+       AssetManager assetManager = applicationContext.getAssets();
+       if (!copyAsset(assetManager, "ladybird-assets.tar", assetDir.getAbsolutePath() + "/ladybird-assets.tar")) {
+            Log.e("Ladybird", "Unable to copy assets");
+            return "Invalid Assets, this won't work";
+       }
+       Log.d("Ladybird", "Copied ladybird-assets.tar to app-specific storage path");
+       return assetDir.getAbsolutePath();
+    }
+
+    // ty to https://stackoverflow.com/a/22903693 for the sauce
+    private static boolean copyAsset(AssetManager assetManager,
+            String fromAssetPath, String toPath) {
+        InputStream in = null;
+        OutputStream out = null;
+        try {
+          in = assetManager.open(fromAssetPath);
+          new File(toPath).createNewFile();
+          out = new FileOutputStream(toPath);
+          copyFile(in, out);
+          in.close();
+          in = null;
+          out.flush();
+          out.close();
+          out = null;
+          return true;
+        } catch(Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    private static void copyFile(InputStream in, OutputStream out) throws IOException {
+        byte[] buffer = new byte[4096];
+        int read;
+        while((read = in.read(buffer)) != -1){
+          out.write(buffer, 0, read);
+        }
+    }
+};