Android换肤（二）源码分析App资源的加载流程

大家思考一下，如果我们要去给我们的app换肤，肯定需要用到插件化的加载方式，
去加载第三方的apk包，所以我们需要知道frameWork层是怎么去加载整个app的资源的。

我们先看看把打包完成的一个apk解压缩出来会生成以下文件

image.png

assets：资源文件
lib：so库，ndk开发的代码库
META-INF：一系列的签名文件，apk发布就需要签名文件来签名，不然发布不了、手机也安装不了
大量的dex文件：java编译生成的java文件（包括R.java文件）。

其中resources.arsc就是我们本文要将的重点，它的储存结构类似于数据库文件，主要用于表示整个app里所有资源的对应关系

image.png

例如我们要找一个color资源，Name表示这个xml文件的名字，default表示这个xml文件的所在的位置，还有ID信息是不是很像我们的数据库表信息。
实际上，当我们去加载一个apk包的时候，会有一个类去负责加载resources.arsc文件中的信息，所以我们本文的重点就是分析下，在源码中resources.arsc文件中的信息是怎么实现加载的。

和第一篇文章Android换肤（一）源码分析View的创建流程一样，我们直接从ActivityThread开始。

1、ActivityThread#handleBindApplication

了解过Activity创建、启动流程源码的小伙伴肯定知道，在application和activity的所有生命周期调用中，都会先调用instrumentation的相应方法。
例如：callActivityOnCreate,callApplicationOnCreate,newActivity,callActivityOnNewIntent

对于每一个android app来说，它的总入口都是ActivityThread#main. 每一个应用的进程都有一个ActivityThread对象，而每一个ActivityThread对象都有一个Instrumentation mInstrumentation;成员变量。mInstrumentation的初始化ActivityThread#handleBindApplication方法里。

private void handleBindApplication(AppBindData data) {

        。。。此处省略很多代码。。。

         mInstrumentation = new Instrumentation();

        。。。此处省略很多代码。。。

        Application app;
        final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskWrites();
        final StrictMode.ThreadPolicy writesAllowedPolicy = StrictMode.getThreadPolicy();
        try {
            // If the app is being launched for full backup or restore, bring it up in
            // a restricted environment with the base application class.
            app = data.info.makeApplication(data.restrictedBackupMode, null);

            // Propagate autofill compat state
            app.setAutofillOptions(data.autofillOptions);

            // Propagate Content Capture options
            app.setContentCaptureOptions(data.contentCaptureOptions);

            mInitialApplication = app;

            // don't bring up providers in restricted mode; they may depend on the
            // app's custom Application class
            if (!data.restrictedBackupMode) {
                if (!ArrayUtils.isEmpty(data.providers)) {
                    installContentProviders(app, data.providers);
                }
            }

            // Do this after providers, since instrumentation tests generally start their
            // test thread at this point, and we don't want that racing.
            try {
                mInstrumentation.onCreate(data.instrumentationArgs);
            }
            catch (Exception e) {
                throw new RuntimeException(
                    "Exception thrown in onCreate() of "
                    + data.instrumentationName + ": " + e.toString(), e);
            }
            try {
                mInstrumentation.callApplicationOnCreate(app);
            } catch (Exception e) {
                if (!mInstrumentation.onException(app, e)) {
                    throw new RuntimeException(
                      "Unable to create application " + app.getClass().getName()
                      + ": " + e.toString(), e);
                }
            }
        } finally {
            // If the app targets < O-MR1, or doesn't change the thread policy
            // during startup, clobber the policy to maintain behavior of b/36951662
            if (data.appInfo.targetSdkVersion < Build.VERSION_CODES.O_MR1
                    || StrictMode.getThreadPolicy().equals(writesAllowedPolicy)) {
                StrictMode.setThreadPolicy(savedPolicy);
            }
        }

}

我们看到了这里主要是新建了一个mInstrumentation成员对象，然后又通过 app = data.info.makeApplication(data.restrictedBackupMode, null);
创建了一个Application，再调用mInstrumentation的callApplicationOnCreate(app)方法调用了Application的OnCreate方法。

所以我们先进入makeApplication看看Application是怎么创建的，

2、LoadedApk#makeApplication

    @UnsupportedAppUsage
    public Application makeApplication(boolean forceDefaultAppClass,
            Instrumentation instrumentation) {
        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;
    }

先通过这句代码 ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this);创建一个app的上下文appContext，所以我们再进入createAppContext看看是怎么创建的```

 static ContextImpl createAppContext(ActivityThread mainThread, LoadedApk packageInfo,
            String opPackageName) {
        if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
        ContextImpl context = new ContextImpl(null, mainThread, packageInfo, null, null, null, 0,
                null, opPackageName);
        context.setResources(packageInfo.getResources());
        return context;
    }

看到这句代码context.setResources(packageInfo.getResources());，字面意思就是从包信息中获取资源，并且设置给上下文context。看到这里终于看到了我们本文的重点，所以我们再进去，看看到底是怎么获取资源的呢？进入getResources方法.

3、LoadedApk#getResources

 @UnsupportedAppUsage
    public Resources getResources() {
        if (mResources == null) {
            final String[] splitPaths;
            try {
                splitPaths = getSplitPaths(null);
            } catch (NameNotFoundException e) {
                // This should never fail.
                throw new AssertionError("null split not found");
            }

            mResources = ResourcesManager.getInstance().getResources(null, mResDir,
                    splitPaths, mOverlayDirs, mApplicationInfo.sharedLibraryFiles,
                    Display.DEFAULT_DISPLAY, null, getCompatibilityInfo(),
                    getClassLoader());
        }
        return mResources;
    }

我们看到通过 mResources = ResourcesManager.getInstance().getResources进行mResources的初始化，所以再进入ResourcesManager#getResources方法

 public @Nullable Resources getResources(@Nullable IBinder activityToken,
            @Nullable String resDir,
            @Nullable String[] splitResDirs,
            @Nullable String[] overlayDirs,
            @Nullable String[] libDirs,
            int displayId,
            @Nullable Configuration overrideConfig,
            @NonNull CompatibilityInfo compatInfo,
            @Nullable ClassLoader classLoader) {
        try {
            Trace.traceBegin(Trace.TRACE_TAG_RESOURCES, "ResourcesManager#getResources");
            final ResourcesKey key = new ResourcesKey(
                    resDir,
                    splitResDirs,
                    overlayDirs,
                    libDirs,
                    displayId,
                    overrideConfig != null ? new Configuration(overrideConfig) : null, // Copy
                    compatInfo);
            classLoader = classLoader != null ? classLoader : ClassLoader.getSystemClassLoader();
            return getOrCreateResources(activityToken, key, classLoader);
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_RESOURCES);
        }
    }

再进入getOrCreateResources方法

 private @Nullable Resources getOrCreateResources(@Nullable IBinder activityToken,
            @NonNull ResourcesKey key, @NonNull ClassLoader classLoader) {
        synchronized (this) {
            if (DEBUG) {
                Throwable here = new Throwable();
                here.fillInStackTrace();
                Slog.w(TAG, "!! Get resources for activity=" + activityToken + " key=" + key, here);
            }

            if (activityToken != null) {
                final ActivityResources activityResources =
                        getOrCreateActivityResourcesStructLocked(activityToken);

                // Clean up any dead references so they don't pile up.
                ArrayUtils.unstableRemoveIf(activityResources.activityResources,
                        sEmptyReferencePredicate);

                // Rebase the key's override config on top of the Activity's base override.
                if (key.hasOverrideConfiguration()
                        && !activityResources.overrideConfig.equals(Configuration.EMPTY)) {
                    final Configuration temp = new Configuration(activityResources.overrideConfig);
                    temp.updateFrom(key.mOverrideConfiguration);
                    key.mOverrideConfiguration.setTo(temp);
                }

                ResourcesImpl resourcesImpl = findResourcesImplForKeyLocked(key);
                if (resourcesImpl != null) {
                    if (DEBUG) {
                        Slog.d(TAG, "- using existing impl=" + resourcesImpl);
                    }
                    return getOrCreateResourcesForActivityLocked(activityToken, classLoader,
                            resourcesImpl, key.mCompatInfo);
                }

                // We will create the ResourcesImpl object outside of holding this lock.

            } else {
                // Clean up any dead references so they don't pile up.
                ArrayUtils.unstableRemoveIf(mResourceReferences, sEmptyReferencePredicate);

                // Not tied to an Activity, find a shared Resources that has the right ResourcesImpl
                ResourcesImpl resourcesImpl = findResourcesImplForKeyLocked(key);
                if (resourcesImpl != null) {
                    if (DEBUG) {
                        Slog.d(TAG, "- using existing impl=" + resourcesImpl);
                    }
                    return getOrCreateResourcesLocked(classLoader, resourcesImpl, key.mCompatInfo);
                }

                // We will create the ResourcesImpl object outside of holding this lock.
            }

            // If we're here, we didn't find a suitable ResourcesImpl to use, so create one now.
            ResourcesImpl resourcesImpl = createResourcesImpl(key);
            if (resourcesImpl == null) {
                return null;
            }

            // Add this ResourcesImpl to the cache.
            mResourceImpls.put(key, new WeakReference<>(resourcesImpl));

            final Resources resources;
            if (activityToken != null) {
                resources = getOrCreateResourcesForActivityLocked(activityToken, classLoader,
                        resourcesImpl, key.mCompatInfo);
            } else {
                resources = getOrCreateResourcesLocked(classLoader, resourcesImpl, key.mCompatInfo);
            }
            return resources;
        }
    }

主要看到这句代码 ResourcesImpl resourcesImpl =createResourcesImpl(key);
看看它的资源是怎么创建的

 private @Nullable ResourcesImpl createResourcesImpl(@NonNull ResourcesKey key) {
        final DisplayAdjustments daj = new DisplayAdjustments(key.mOverrideConfiguration);
        daj.setCompatibilityInfo(key.mCompatInfo);

        final AssetManager assets = createAssetManager(key);
        if (assets == null) {
            return null;
        }

        final DisplayMetrics dm = getDisplayMetrics(key.mDisplayId, daj);
        final Configuration config = generateConfig(key, dm);
        final ResourcesImpl impl = new ResourcesImpl(assets, dm, config, daj);

        if (DEBUG) {
            Slog.d(TAG, "- creating impl=" + impl + " with key: " + key);
        }
        return impl;
    }

再进入 final AssetManager assets = createAssetManager(key);

 protected @Nullable AssetManager createAssetManager(@NonNull final ResourcesKey key) {
        final AssetManager.Builder builder = new AssetManager.Builder();

        // resDir can be null if the 'android' package is creating a new Resources object.
        // This is fine, since each AssetManager automatically loads the 'android' package
        // already.
        if (key.mResDir != null) {
            try {
                builder.addApkAssets(loadApkAssets(key.mResDir, false /*sharedLib*/,
                        false /*overlay*/));
            } catch (IOException e) {
                Log.e(TAG, "failed to add asset path " + key.mResDir);
                return null;
            }
        }

        if (key.mSplitResDirs != null) {
            for (final String splitResDir : key.mSplitResDirs) {
                try {
                    builder.addApkAssets(loadApkAssets(splitResDir, false /*sharedLib*/,
                            false /*overlay*/));
                } catch (IOException e) {
                    Log.e(TAG, "failed to add split asset path " + splitResDir);
                    return null;
                }
            }
        }

        if (key.mOverlayDirs != null) {
            for (final String idmapPath : key.mOverlayDirs) {
                try {
                    builder.addApkAssets(loadApkAssets(idmapPath, false /*sharedLib*/,
                            true /*overlay*/));
                } catch (IOException e) {
                    Log.w(TAG, "failed to add overlay path " + idmapPath);

                    // continue.
                }
            }
        }

        if (key.mLibDirs != null) {
            for (final String libDir : key.mLibDirs) {
                if (libDir.endsWith(".apk")) {
                    // Avoid opening files we know do not have resources,
                    // like code-only .jar files.
                    try {
                        builder.addApkAssets(loadApkAssets(libDir, true /*sharedLib*/,
                                false /*overlay*/));
                    } catch (IOException e) {
                        Log.w(TAG, "Asset path '" + libDir +
                                "' does not exist or contains no resources.");

                        // continue.
                    }
                }
            }
        }

        return builder.build();
    }

看到 builder.addApkAssets(loadApkAssets(key.mResDir, false /sharedLib/,
false /overlay/));这句代码，

 private @NonNull ApkAssets loadApkAssets(String path, boolean sharedLib, boolean overlay)
            throws IOException {
        final ApkKey newKey = new ApkKey(path, sharedLib, overlay);
        ApkAssets apkAssets = null;
        if (mLoadedApkAssets != null) {
            apkAssets = mLoadedApkAssets.get(newKey);
            if (apkAssets != null) {
                return apkAssets;
            }
        }

        // Optimistically check if this ApkAssets exists somewhere else.
        final WeakReference<ApkAssets> apkAssetsRef = mCachedApkAssets.get(newKey);
        if (apkAssetsRef != null) {
            apkAssets = apkAssetsRef.get();
            if (apkAssets != null) {
                if (mLoadedApkAssets != null) {
                    mLoadedApkAssets.put(newKey, apkAssets);
                }

                return apkAssets;
            } else {
                // Clean up the reference.
                mCachedApkAssets.remove(newKey);
            }
        }

        // We must load this from disk.
        if (overlay) {
            apkAssets = ApkAssets.loadOverlayFromPath(overlayPathToIdmapPath(path),
                    false /*system*/);
        } else {
            apkAssets = ApkAssets.loadFromPath(path, false /*system*/, sharedLib);
        }

        if (mLoadedApkAssets != null) {
            mLoadedApkAssets.put(newKey, apkAssets);
        }

        mCachedApkAssets.put(newKey, new WeakReference<>(apkAssets));
        return apkAssets;
    }

mLoadedApkAssets里储存的就是我们文章开头讲的资源文件的键-值关系，源码里使用LruCache的方式保存的，具体还想看细节的小伙伴可以再深入ApkAssets类来看看资源文件是怎么加载进来，我这里透露一点，其实就是通过底层native方法读文件的流来实现的。我们这篇文章主要找到apk资源加载的点，以便我们实现换肤的流程，所以就适可而止了。源码看到这里我们应该有思路了，要实现换皮肤，就是要把我们插件apk的资源插入到我们宿主apk的mLoadedApkAssets里面就可以了。
用下面的关系图总结一下第三步流程中涉及的主要类的关系图