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ffi #jni_main R.1: manifest synthesis + default parent → android.app.Activity

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When `Compilation.lowering_jni_main_decls` is non-empty, `createApk`
synthesises a manifest whose `<activity android:name>` points at the
user's `#jni_main` class (dotted form of the foreign path), sets
`android:hasCode="true"` so Android loads the bundled classes.dex, and
drops the `android.app.lib_name` meta-data (that's the NativeActivity-
specific autoload mechanism — Java-driven Activities load the .so via
`System.loadLibrary` from a Java static initializer slice R.3 will
emit). The legacy NativeActivity path stays as the fallback when no
`#jni_main` decl is present.

`jni_java_emit.zig`'s default superclass moves from
`android.app.NativeActivity` to `android.app.Activity` — the former
requires native_app_glue's `ANativeActivity_onCreate` to be in the .so,
which the next slice (R.2) will stop linking by default.

Verified end-to-end on the slice 2 smoke APK: `aapt2 dump xmltree`
shows `android:name="co.swipelab.sxjnimain.SxApp"` + `hasCode="true"`,
and `dexdump -l plain` confirms SxApp now extends `Landroid/app/Activity;`.
99-android-egl-clear's APK still uses the NativeActivity manifest as
before (legacy path intact for R.2-R.5).
This commit is contained in:
agra
2026-05-20 14:55:26 +03:00
parent 5648337749
commit 8ae4e0c653
3 changed files with 51 additions and 5 deletions
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47
src/target.zig
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@@ -430,13 +430,20 @@ pub fn createApk(allocator: std.mem.Allocator, io: std.Io, so_path: []const u8,
const so_dest = try std.fs.path.join(allocator, &.{ lib_dir, so_basename });
cwd.copyFile(so_path, cwd, so_dest, io, .{}) catch return error.ApkStageFailed;
// Manifest: either user-supplied or auto-generated.
// Manifest: either user-supplied or auto-generated. When a `#jni_main`
// class is declared, the auto-generated manifest points its
// `<activity android:name="...">` at the user's class and flips
// `android:hasCode="true"` so Android loads the bundled classes.dex.
// Otherwise we fall back to the legacy NativeActivity shape.
const manifest_path = if (target_config.manifest_path) |mp|
try allocator.dupe(u8, mp)
else blk: {
const generated = try std.fmt.allocPrint(allocator, "{s}/AndroidManifest.xml", .{stage});
const lib_name = libNameFromSoBasename(so_basename);
const manifest_xml = try buildAndroidManifest(allocator, bundle_id, lib_name);
const manifest_xml = if (jni_main_decls.len > 0)
try buildJniMainManifest(allocator, bundle_id, lib_name, jni_main_decls[0].foreign_path)
else
try buildAndroidManifest(allocator, bundle_id, lib_name);
try cwd.writeFile(io, .{ .sub_path = generated, .data = manifest_xml });
break :blk generated;
};
@@ -514,6 +521,42 @@ fn libNameFromSoBasename(basename: []const u8) []const u8 {
return name;
}
/// Manifest for a `#jni_main` Activity: `<activity android:name>` points
/// at the user's class, `android:hasCode="true"` so the bundled
/// classes.dex is loaded, and the `android.app.lib_name` meta-data is
/// dropped (that's a NativeActivity-only mechanism — Java-driven
/// Activities load the .so via `System.loadLibrary` from a static
/// initializer the Java emitter will synthesize once slice R.3 lands).
fn buildJniMainManifest(allocator: std.mem.Allocator, package: []const u8, lib_name: []const u8, foreign_path: []const u8) ![]const u8 {
var class_name = std.ArrayList(u8).empty;
for (foreign_path) |ch| {
try class_name.append(allocator, if (ch == '/') '.' else ch);
}
const activity_name = try class_name.toOwnedSlice(allocator);
return std.fmt.allocPrint(allocator,
\\<?xml version="1.0" encoding="utf-8"?>
\\<manifest xmlns:android="http://schemas.android.com/apk/res/android"
\\ package="{s}"
\\ android:versionCode="1"
\\ android:versionName="1.0">
\\ <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="34" />
\\ <application android:label="{s}" android:hasCode="true">
\\ <activity
\\ android:name="{s}"
\\ android:exported="true"
\\ android:label="{s}"
\\ android:configChanges="orientation|keyboardHidden|screenSize">
\\ <intent-filter>
\\ <action android:name="android.intent.action.MAIN" />
\\ <category android:name="android.intent.category.LAUNCHER" />
\\ </intent-filter>
\\ </activity>
\\ </application>
\\</manifest>
\\
, .{ package, lib_name, activity_name, lib_name });
}
fn buildAndroidManifest(allocator: std.mem.Allocator, package: []const u8, lib_name: []const u8) ![]const u8 {
return std.fmt.allocPrint(allocator,
\\<?xml version="1.0" encoding="utf-8"?>