ContextImpl appContext = ContextImpl.createActivityContext(
                this, r.packageInfo, r.activityInfo, r.token, displayId, r.overrideConfig);

class ContextImpl extends Context {
    static ContextImpl createActivityContext(ActivityThread mainThread,
            LoadedApk packageInfo, ActivityInfo activityInfo, IBinder activityToken, int displayId,
            Configuration overrideConfiguration) {
        if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
        String[] splitDirs = packageInfo.getSplitResDirs();
        ClassLoader classLoader = packageInfo.getClassLoader();
        if (packageInfo.getApplicationInfo().requestsIsolatedSplitLoading()) {
            Trace.traceBegin(Trace.TRACE_TAG_RESOURCES, "SplitDependencies");
            try {
                classLoader = packageInfo.getSplitClassLoader(activityInfo.splitName);
                splitDirs = packageInfo.getSplitPaths(activityInfo.splitName);
            } catch (NameNotFoundException e) {
                // Nothing above us can handle a NameNotFoundException, better crash.
                throw new RuntimeException(e);
            } finally {
                Trace.traceEnd(Trace.TRACE_TAG_RESOURCES);
            }
        }
        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, activityInfo.splitName,
                activityToken, null, 0, classLoader);
        // Clamp display ID to DEFAULT_DISPLAY if it is INVALID_DISPLAY.
        displayId = (displayId != Display.INVALID_DISPLAY) ? displayId : Display.DEFAULT_DISPLAY;
        final CompatibilityInfo compatInfo = (displayId == Display.DEFAULT_DISPLAY)
                ? packageInfo.getCompatibilityInfo()
                : CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
        final ResourcesManager resourcesManager = ResourcesManager.getInstance();
        // Create the base resources for which all configuration contexts for this Activity
        // will be rebased upon.
        context.setResources(resourcesManager.createBaseActivityResources(activityToken,
                packageInfo.getResDir(),
                splitDirs,
                packageInfo.getOverlayDirs(),
                packageInfo.getApplicationInfo().sharedLibraryFiles,
                displayId,
                overrideConfiguration,
                compatInfo,
                classLoader));
        context.mDisplay = resourcesManager.getAdjustedDisplay(displayId,
                context.getResources());
        return context;
    }
}

public class AppCompatActivity extends FragmentActivity implements AppCompatCallback,
        TaskStackBuilder.SupportParentable, ActionBarDrawerToggle.DelegateProvider {
    private static final String DELEGATE_TAG = "androidx:appcompat";
    private AppCompatDelegate mDelegate;
    private Resources mResources;
}

public Activity newActivity(Class<?> clazz, Context context, 
            IBinder token, Application application, Intent intent, ActivityInfo info, 
            CharSequence title, Activity parent, String id,
            Object lastNonConfigurationInstance) throws InstantiationException, 
            IllegalAccessException {
        Activity activity = (Activity)clazz.newInstance();
        ActivityThread aThread = null;
        // Activity.attach expects a non-null Application Object.
        if (application == null) {
            application = new Application();
        }
        activity.attach(context, aThread, this, token, 0 /* ident */, application, intent,
                info, title, parent, id,
                (Activity.NonConfigurationInstances)lastNonConfigurationInstance,
                new Configuration(), null /* referrer */, null /* voiceInteractor */,
                null /* window */, null /* activityConfigCallback */);
        return activity;
    }

/** Reference to singleton {@link ActivityThread} */
    private static volatile ActivityThread sCurrentActivityThread;
    Instrumentation mInstrumentation;