【Android 安全】DEX 加密 ( Application 替换 | 分析 Activity 组件中获取的 Application | ActivityThread | LoadedApk )（三）

public class Instrumentation {
    /**
     * Perform instantiation of an {@link Activity} object.  This method is intended for use with
     * unit tests, such as android.test.ActivityUnitTestCase.  The activity will be useable
     * locally but will be missing some of the linkages necessary for use within the system.
     * 
     * @param clazz The Class of the desired Activity
     * @param context The base context for the activity to use
     * @param token The token for this activity to communicate with
     * @param application The application object (if any)
     * @param intent The intent that started this Activity
     * @param info ActivityInfo from the manifest
     * @param title The title, typically retrieved from the ActivityInfo record
     * @param parent The parent Activity (if any)
     * @param id The embedded Id (if any)
     * @param lastNonConfigurationInstance Arbitrary object that will be
     * available via {@link Activity#getLastNonConfigurationInstance()
     * Activity.getLastNonConfigurationInstance()}.
     * @return Returns the instantiated activity
     * @throws InstantiationException
     * @throws IllegalAccessException
     */
    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(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;
    }
}

public final class LoadedApk {
    public Application makeApplication(boolean forceDefaultAppClass,
            Instrumentation instrumentation) {
  // ★ 如果之前创建过 Application , 就直接使用 
        if (mApplication != null) {
            return mApplication;
        }
        Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "makeApplication");
        Application app = null;
        String appClass = mApplicationInfo.className;
        if (forceDefaultAppClass || (appClass == null)) {
            appClass = "android.app.Application";
        }
        try {
            java.lang.ClassLoader cl = getClassLoader();
            if (!mPackageName.equals("android")) {
                Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER,
                        "initializeJavaContextClassLoader");
                initializeJavaContextClassLoader();
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
            }
            ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this);
            app = mActivityThread.mInstrumentation.newApplication(
                    cl, appClass, appContext);
            appContext.setOuterContext(app);
        } catch (Exception e) {
            if (!mActivityThread.mInstrumentation.onException(app, e)) {
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                throw new RuntimeException(
                    "Unable to instantiate application " + appClass
                    + ": " + e.toString(), e);
            }
        }
        mActivityThread.mAllApplications.add(app);
        mApplication = app;
        if (instrumentation != null) {
            try {
                instrumentation.callApplicationOnCreate(app);
            } catch (Exception e) {
                if (!instrumentation.onException(app, e)) {
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    throw new RuntimeException(
                        "Unable to create application " + app.getClass().getName()
                        + ": " + e.toString(), e);
                }
            }
        }
        // Rewrite the R 'constants' for all library apks.
        SparseArray<String> packageIdentifiers = getAssets().getAssignedPackageIdentifiers();
        final int N = packageIdentifiers.size();
        for (int i = 0; i < N; i++) {
            final int id = packageIdentifiers.keyAt(i);
            if (id == 0x01 || id == 0x7f) {
                continue;
            }
            rewriteRValues(getClassLoader(), packageIdentifiers.valueAt(i), id);
        }
        Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
        return app;
    }
}