From a2cd95f89d0ad6448dd6508f9515ce9026b37d23 Mon Sep 17 00:00:00 2001
From: Thomas Weber <muffin@muffin.ink>
Date: Sat, 11 Dec 2021 22:14:48 -0600
Subject: [PATCH] Android support

---
 src/locales/en.json           |   5 +-
 src/p4/P4.svelte              |   2 +-
 src/p4/PackagerOptions.svelte | 133 +++++++++++++++++++++++++++++++++-
 src/p4/template.ejs           |   2 +-
 src/packager/packager.js      |  17 +++++
 5 files changed, 153 insertions(+), 6 deletions(-)

diff --git a/src/locales/en.json b/src/locales/en.json
index 49cf8a3a..7eae9d55 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -1,7 +1,7 @@
 {
   "p4": {
     "description1": {
-      "string": "Converts Scratch projects into HTML files, zip archives, or executable programs for Windows, macOS, and Linux."
+      "string": "Converts Scratch projects into HTML files, zip archives, or executable programs for Windows, macOS, Linux, and Android."
     },
     "description2": {
       "string": "If you just want an easy way to embed a project into your website, you may be interested in {embedding}."
@@ -363,6 +363,9 @@
       "string": "{type} Linux application (64-bit only)",
       "context": "type will become something like 'NW.js' or 'Electron'. Do not translate 'Linux'."
     },
+    "application-android": {
+      "string": "Android app (Highly experimental)"
+    },
     "otherEnvironments": {
       "string": "Other environments (Click to open)",
       "context": "Text that can be clicked to expand list of environments to include some unrecommended ones."
diff --git a/src/p4/P4.svelte b/src/p4/P4.svelte
index c57483a0..dba55ed2 100644
--- a/src/p4/P4.svelte
+++ b/src/p4/P4.svelte
@@ -83,7 +83,7 @@
   :global([theme="dark"] .is-not-safari select:hover) {
     border-color: #bbb;
   }
-  :global(p), :global(h1), :global(h2), :global(h3) {
+  :global(p), :global(pre), :global(h1), :global(h2), :global(h3) {
     margin: 12px 0;
   }
   :global(summary) {
diff --git a/src/p4/PackagerOptions.svelte b/src/p4/PackagerOptions.svelte
index efbc73cc..68a13d4b 100644
--- a/src/p4/PackagerOptions.svelte
+++ b/src/p4/PackagerOptions.svelte
@@ -180,8 +180,9 @@
     font-weight: bold;
     background: yellow;
     color: black;
-    padding: 10px;
-    border-radius: 10px;
+    padding: 12px;
+    border-radius: 12px;
+    margin: 12px 0;
   }
 </style>
 
@@ -609,6 +610,13 @@
       </label>
     </div>
 
+    <div class="group">
+      <label class="option">
+        <input type="radio" name="environment" bind:group={$options.target} value="android">
+        {$_('options.application-android')}
+      </label>
+    </div>
+
     <details open={otherEnvironmentsInitiallyOpen}>
       <summary>{$_('options.otherEnvironments')}</summary>
       <p>{$_('options.otherEnvironmentsHelp')}</p>
@@ -660,7 +668,8 @@
         {#if $options.target.startsWith('zip')}
           <h2>Zip</h2>
           <p>The zip environment is intended to be used for publishing to a website. Other uses such as sending your project to a friend over a chat app or email should use "Plain HTML" instead as zip will not work.</p>
-        {:else}
+        {/if}
+        {#if !$options.target.startsWith('zip')}
           <h2>{$_('options.applicationSettings')}</h2>
           <label class="option">
             {$_('options.packageName')}
@@ -715,6 +724,124 @@
             <p class="warning">NW.js support is deprecated and may be removed in the future. Use Electron instead if possible.</p>
             <p>For further help and steps, see <a href="https://docs.nwjs.io/en/latest/For%20Users/Package%20and%20Distribute/#linux">NW.js Documentation</a>.</p>
           {/if}
+        {:else if $options.target === 'android'}
+          <h2>Android</h2>
+
+          <div class="warning">
+            Unlike the other environments, Android support is not fully automated. You must manually create an app. This section will try to guide you through the process.
+          </div>
+
+          <p>This section assumes you have complete access to a Windows, macOS, or Linux computer.</p>
+
+          <h3>Install Android Studio</h3>
+          <p><a href="https://developer.android.com/studio/">Install Android Studio.</a></p>
+          <p>This quite large and may take a while.</p>
+
+          <h3>Create a new project</h3>
+          <p>Create a new project in Android studio.</p>
+          <ul>
+            <li>Use the "Empty Activity" template</li>
+            <li>Set Name to your app's name, for example "<code>{$options.app.windowTitle}</code>"</li>
+            <li>Set Package name to "<code>org.turbowarp.packager.userland.{$options.app.packageName}</code>"</li>
+            <li>Choose a save location that you won't forget</li>
+            <li>Set Language to Kotlin</li>
+            <li>Set Minimum SDK to "API 21: Android 5.0 (Lollipop)"</li>
+          </ul>
+
+          <h3>Create assets folder</h3>
+          <p>In the sidebar on the left, right click on "app", then select "New" > "Folder" > "Assets folder". Use the default settings.</p>
+
+          <h3>Prepare project</h3>
+          <p>
+            <Button on:click={pack} text={'Package the project as a zip'} />
+          </p>
+          <p>Extract the zip and drag its files into "assets" folder you created. (You can directly drag and drop files over the assets folder in Android Studio)</p>
+
+          <h3>Making the app</h3>
+          <p>In the sidebar on the left, navigate to app > src > main > MainActivity. This will open a short Kotlin file.</p>
+          <p>Replace everything after line 2 with the following:</p>
+          <pre>
+            {[
+              'import android.annotation.SuppressLint',
+              'import androidx.appcompat.app.AppCompatActivity',
+              'import android.os.Bundle',
+              'import android.webkit.WebView',
+              '',
+              'class MainActivity : AppCompatActivity() {',
+              '    private lateinit var web: WebView',
+              '',
+              '    @SuppressLint("SetJavaScriptEnabled")',
+              '    override fun onCreate(savedInstanceState: Bundle?) {',
+              '        super.onCreate(savedInstanceState)',
+              '        web = WebView(this)',
+              '        web.settings.javaScriptEnabled = true',
+              '        web.loadUrl("file:///android_asset/index.html")',
+              '        setContentView(web)',
+              '        actionBar?.hide()',
+              '        supportActionBar?.hide()',
+              '    }',
+              '',
+              '    override fun onDestroy() {',
+              '        super.onDestroy()',
+              '        web.destroy()',
+              '    }',
+              '}'
+            ].join('\n')}
+          </pre>
+          <p>At this point, you now have a fully functional Android app. However, there are still a few more things you should change.</p>
+
+          <h3>Fixing screen orientation issues</h3>
+          <p>In the sidebar on the left, open app > main > AndroidManifest.xml</p>
+          <p>Find the section that looks like this:</p>
+          <pre>
+            {[
+              '        <activity',
+              '            android:name=".MainActivity"',
+              '            android:exported="true">',
+            ].join('\n')}
+          </pre>
+          <p>And replace it with this:</p>
+          <pre>
+            {[
+              '        <activity',
+              '            android:configChanges="orientation|screenSize"',
+              '            android:screenOrientation="sensor"',
+              '            android:name=".MainActivity"',
+              '            android:exported="true">',
+            ].join('\n')}
+          </pre>
+
+          <h3>Updating colors</h3>
+          <p>If you ran the app now, it would have a purple color scheme, which may not be what you want. This can be changed.</p>
+          <p>In the sidebar on the left, open app > main > res > values > color.xml.</p>
+          <p>You will see these lines:</p>
+          <pre>
+            {[
+              '    <color name="purple_200">#FFBB86FC</color>',
+              '    <color name="purple_500">#FF6200EE</color>',
+              '    <color name="purple_700">#FF3700B3</color>',
+            ].join('\n')}
+          </pre>
+          <p>Replace those lines with:</p>
+          <pre>
+            {[
+              `    <color name="purple_200">#FF${$options.appearance.background.substr(1)}</color>`,
+              `    <color name="purple_500">#FF${$options.appearance.background.substr(1)}</color>`,
+              `    <color name="purple_700">#FF${$options.appearance.background.substr(1)}</color>`,
+            ].join('\n')}
+          </pre>
+          <p>Do not change the other lines.</p>
+          <p>The above snippet will make the status bar match your app's background color. For advanced users, note that these color codes are a bit unusual in that the "alpha" or "transparency" byte goes first instead of last.</p>
+          <p>Ignore the bits about <code>purple_yyy</code> -- just them as is. While it would be a good idea to these colors, you will be making more work for yourself because you'll have to update some other files to reflect the new names.</p>
+
+          <h3>Updating the project</h3>
+          <p>It's likely that at some point you will want to update the project without redoing this entire guide. Updating is much simpler:</p>
+          <ol>
+            <li>Open Android Studio and open the project</li>
+            <li>Delete everything inside the assets folder</li>
+            <li>Re-run the packager</li>
+            <li>Extract the zip and put all of its files into the assets folder</li>
+          </ol>
         {/if}
       </div>
     </Section>
diff --git a/src/p4/template.ejs b/src/p4/template.ejs
index 4083a6e8..c030f962 100644
--- a/src/p4/template.ejs
+++ b/src/p4/template.ejs
@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <% const {LONG_NAME, WEBSITE} = require('../packager/brand.js'); %>
     <title><%= LONG_NAME %></title>
-    <meta name="description" content="Converts Scratch projects into HTML files, zip archives, or executable programs for Windows, macOS, and Linux.">
+    <meta name="description" content="Converts Scratch projects into HTML files, zip archives, or executable programs for Windows, macOS, Linux, and Android.">
     <% if (process.env.STANDALONE) { %>
       <%
         const fs = require('fs');
diff --git a/src/packager/packager.js b/src/packager/packager.js
index 2950dbc2..07565d51 100644
--- a/src/packager/packager.js
+++ b/src/packager/packager.js
@@ -1105,6 +1105,23 @@ cd "$(dirname "$0")"
         vm.extensionManager.loadExtensionURL(extension);
       }
 
+      ${this.options.target === 'android' ? `
+      // By default, storage will try to use fetch() in a Worker
+      // That doesn't work in an Android WebView, but XHR does, so...
+      scaffolding.storage.addHelper({
+        load: (assetType, assetId, dataFormat) => new Promise((resolve, reject) => {
+          const xhr = new XMLHttpRequest();
+          xhr.responseType = "arraybuffer";
+          xhr.onerror = () => reject(new Error("Request failed"));
+          xhr.onload = () => resolve(new scaffolding.storage.Asset(assetType, assetId, dataFormat, new Uint8Array(xhr.response)));
+          xhr.open("GET", './assets/' + assetId + '.' + dataFormat);
+          xhr.send();
+        }),
+        // Above default tool, below "builtin" tool
+        priority: 50
+      });
+      ` : ''}
+
       ${this.options.target.startsWith('nwjs-') ? `
       if (typeof nw !== 'undefined') {
         const win = nw.Window.get();