App 2.19.5: the installer screen fallback reads the APK

The car refuses the silent session for a non-system app; the fallback
installer screen could not read our FileProvider URI because grants
from the system user are refused. The car build now hands it a file
URI to the verified copy in Downloads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/build.gradle

@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 103
-        versionName "2.19.4"
+        versionCode 104
+        versionName "2.19.5"
 
         // Nothing about the server ships in the APK: its URL and ingest token are entered in
         // the app's Server tab (ServerConfig), and the database is only reachable by the server.

app/src/unstable/java/com/evsuite/abrp/OtaUpdater.java

@@ -566,6 +566,28 @@ final class OtaUpdater {
         }
 
         File publicApk = copyToPublicDownloads(apk);
+        if (android.os.Process.myUid() == android.os.Process.SYSTEM_UID) {
+            // As the system user, our FileProvider's read grant is refused ("not exported from
+            // UID 1000") and the installer reports the unreadable file as a parse error. A file
+            // URI it reads with its own storage permission instead, as from the Files app.
+            Intent install = new Intent(Intent.ACTION_VIEW)
+                    .setDataAndType(Uri.fromFile(publicApk), "application/vnd.android.package-archive")
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            if (install.resolveActivity(context.getPackageManager()) == null) {
+                throw new IllegalStateException("No package installer activity");
+            }
+            // StrictMode forbids file URIs in intents (FileUriExposedException): lifted for this
+            // one call only.
+            android.os.StrictMode.VmPolicy policy = android.os.StrictMode.getVmPolicy();
+            android.os.StrictMode.setVmPolicy(new android.os.StrictMode.VmPolicy.Builder().build());
+            try {
+                context.startActivity(install);
+            } finally {
+                android.os.StrictMode.setVmPolicy(policy);
+            }
+            Log.i(TAG, "System install UI opened with a file URI for " + publicApk.getAbsolutePath());
+            return;
+        }
         Uri contentUri = FileProvider.getUriForFile(context,
                 context.getPackageName() + ".fileprovider", publicApk);
         Intent install = new Intent(Intent.ACTION_VIEW)