updater stuff

mobile/android/love/build.gradle

@@ -10,9 +10,9 @@ android {
     ndkVersion '25.2.9519653'
 
     defaultConfig {
-        minSdk 16
-        compileSdk 34
-        targetSdk 34
+        minSdk 19
+        compileSdk 36
+        targetSdk 36
         externalNativeBuild {
             ndkBuild {
                 arguments "-j" + Runtime.runtime.availableProcessors()

mobile/android/love/src/jni/love/src/common/android.cpp

@@ -283,6 +283,40 @@ bool restartApp()
 	return result;
 }
 
+bool installApk(const char *path)
+{
+	if (path == nullptr || path[0] == '\0')
+		return false;
+
+	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
+	// This may be called from Lua's main thread, but use the activity object
+	// class just like httpDownload so a future worker caller does not depend on
+	// the system JNI class loader finding the app class.
+	void *rawActivity = SDL_AndroidGetActivity();
+	if (rawActivity == nullptr)
+		return false;
+	jobject activityObj = (jobject) rawActivity;
+	jclass activity = env->GetObjectClass(activityObj);
+	env->DeleteLocalRef(activityObj);
+
+	jmethodID method = env->GetStaticMethodID(activity, "installApk",
+		"(Ljava/lang/String;Ljava/lang/String;)Z");
+	if (method == nullptr)
+	{
+		env->ExceptionClear();
+		env->DeleteLocalRef(activity);
+		return false;
+	}
+
+	jstring jpath = env->NewStringUTF(path);
+	jstring jroot = env->NewStringUTF(bridgeSaveDirectory());
+	jboolean result = env->CallStaticBooleanMethod(activity, method, jpath, jroot);
+	env->DeleteLocalRef(jroot);
+	env->DeleteLocalRef(jpath);
+	env->DeleteLocalRef(activity);
+	return result;
+}
+
 bool updateAppShortcuts(const std::vector<std::string> &versions)
 {
 	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();

mobile/android/love/src/jni/love/src/common/android.h

@@ -90,6 +90,12 @@ bool syncHealthSteps();
  **/
 bool restartApp();
 
+/**
+ * Stages a checksum-verified APK from the current save directory and starts
+ * Android's user-confirmed Package Installer flow. Android-only.
+ **/
+bool installApk(const char *path);
+
 /**
  * Dynamic App Shortcuts: updates Android ShortcutManager with ready game versions.
  **/

mobile/android/love/src/jni/love/src/modules/system/System.cpp

@@ -245,6 +245,16 @@ bool System::restartApp() const
 #endif
 }
 
+bool System::installApk(const char *path) const
+{
+#ifdef LOVE_ANDROID
+	return love::android::installApk(path);
+#else
+	LOVE_UNUSED(path);
+	return false;
+#endif
+}
+
 bool System::updateShortcuts(const std::vector<std::string> &versions) const
 {
 #ifdef LOVE_ANDROID

mobile/android/love/src/jni/love/src/modules/system/System.h

@@ -143,6 +143,9 @@ public:
 	 **/
 	virtual bool restartApp() const;
 
+	/** Starts Android's user-confirmed install flow for a verified APK. */
+	virtual bool installApk(const char *path) const;
+
 	virtual bool updateShortcuts(const std::vector<std::string> &versions) const;
 	virtual std::string getLaunchGame() const;
 

mobile/android/love/src/jni/love/src/modules/system/wrap_System.cpp

@@ -132,6 +132,13 @@ int w_restartApp(lua_State *L)
 	return 1;
 }
 
+int w_installApk(lua_State *L)
+{
+	const char *path = luaL_checkstring(L, 1);
+	luax_pushboolean(L, instance()->installApk(path));
+	return 1;
+}
+
 int w_httpDownload(lua_State *L)
 {
 	const char *url = luaL_checkstring(L, 1);
@@ -325,6 +332,7 @@ static const luaL_Reg functions[] =
 	{ "createFile", w_createFile },
 	{ "syncHealthSteps", w_syncHealthSteps },
 	{ "restartApp", w_restartApp },
+	{ "installApk", w_installApk },
 	{ "updateShortcuts", w_updateShortcuts },
 	{ "getLaunchGame", w_getLaunchGame },
 	{ "httpDownload", w_httpDownload },

mobile/android/love/src/main/java/org/love2d/android/GameActivity.java

@@ -45,6 +45,7 @@ import android.app.AlarmManager;
 import android.app.AlertDialog;
 import android.app.PendingIntent;
 import android.content.Context;
+import android.content.ClipData;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -77,6 +78,7 @@ import android.view.*;
 
 import androidx.annotation.Keep;
 import androidx.core.app.ActivityCompat;
+import androidx.core.content.FileProvider;
 
 public class GameActivity extends SDLActivity {
     private static DisplayMetrics metrics = null;
@@ -696,6 +698,103 @@ public class GameActivity extends SDLActivity {
         return true; // unreachable, but keeps the JNI signature honest
     }
 
+    /**
+     * Stages a verified release APK in cache and asks Android's Package
+     * Installer to update this package. This never silently installs an APK:
+     * the platform owns both the unknown-sources consent and final install
+     * confirmation. `updateRoot` comes from the native save directory and is
+     * checked before any file is read, so a Lua caller cannot turn this into a
+     * general-purpose local-file sharing bridge.
+     */
+    @Keep
+    public static boolean installApk(final String sourcePath, final String updateRoot) {
+        final GameActivity self = (GameActivity) mSingleton;
+        if (self == null || sourcePath == null || updateRoot == null) return false;
+        final File source;
+        try {
+            source = new File(sourcePath).getCanonicalFile();
+            File root = new File(updateRoot, "updates").getCanonicalFile();
+            String rootPath = root.getPath() + File.separator;
+            if (!source.getPath().startsWith(rootPath)
+                    || !source.isFile() || source.length() == 0
+                    || !source.getName().matches("gen1recomp-[0-9]+\\.[0-9]+\\.[0-9]+-android\\.apk")) {
+                return false;
+            }
+        } catch (IOException e) {
+            Log.d("GameActivity", "invalid update APK path: " + e.getMessage());
+            return false;
+        }
+
+        // Android 8+ lets the user decide whether this app is trusted to
+        // request package installs. Send them to the per-app setting first;
+        // they deliberately tap Install again after granting it.
+        if (android.os.Build.VERSION.SDK_INT >= 26
+                && !self.getPackageManager().canRequestPackageInstalls()) {
+            try {
+                Intent settings = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES,
+                    Uri.parse("package:" + self.getPackageName()));
+                self.startActivity(settings);
+                return true;
+            } catch (Exception e) {
+                Log.d("GameActivity", "could not open install-source settings: " + e.getMessage());
+                return false;
+            }
+        }
+
+        // Copying an APK can be large; keep both I/O and checksum-verified
+        // source access off the UI thread. The FileProvider exposes this cache
+        // child only after it has been fully written and renamed.
+        new Thread(new Runnable() {
+            @Override public void run() {
+                File stagedDir = new File(self.getCacheDir(), "full-update");
+                File partial = new File(stagedDir, "update.apk.part");
+                File staged = new File(stagedDir, "update.apk");
+                try {
+                    if (!stagedDir.exists() && !stagedDir.mkdirs()) return;
+                    copyFile(source, partial);
+                    if (staged.exists() && !staged.delete()) return;
+                    if (!partial.renameTo(staged)) return;
+                    self.runOnUiThread(new Runnable() {
+                        @Override public void run() { launchPackageInstaller(self, staged); }
+                    });
+                } catch (Exception e) {
+                    Log.d("GameActivity", "could not stage update APK: " + e.getMessage());
+                } finally {
+                    if (partial.exists()) partial.delete();
+                }
+            }
+        }, "gen1recomp-apk-stage").start();
+        return true;
+    }
+
+    private static void copyFile(File source, File destination) throws IOException {
+        InputStream in = new BufferedInputStream(new FileInputStream(source));
+        OutputStream out = new BufferedOutputStream(new FileOutputStream(destination));
+        try {
+            byte[] buffer = new byte[32768];
+            int count;
+            while ((count = in.read(buffer)) != -1) out.write(buffer, 0, count);
+        } finally {
+            try { out.close(); } catch (IOException ignored) {}
+            try { in.close(); } catch (IOException ignored) {}
+        }
+    }
+
+    private static void launchPackageInstaller(GameActivity activity, File apk) {
+        try {
+            Context context = activity.getApplicationContext();
+            Uri uri = FileProvider.getUriForFile(context,
+                context.getPackageName() + ".full_update_provider", apk);
+            Intent install = new Intent(Intent.ACTION_INSTALL_PACKAGE);
+            install.setData(uri);
+            install.setClipData(ClipData.newRawUri("apk", uri));
+            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+            activity.startActivity(install);
+        } catch (Exception e) {
+            Log.d("GameActivity", "could not open package installer: " + e.getMessage());
+        }
+    }
+
     @Keep
     public static String getLaunchGame() {
         return initialGame != null ? initialGame : "";