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124 changes: 124 additions & 0 deletions
124
PluginManager/src/main/java/com/reginald/pluginm/core/HostContext.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package com.reginald.pluginm.core; | ||
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| import java.lang.reflect.Field; | ||
| import java.util.List; | ||
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| import com.android.common.ActivityThreadCompat; | ||
| import com.reginald.pluginm.PluginInfo; | ||
| import com.reginald.pluginm.reflect.FieldUtils; | ||
| import com.reginald.pluginm.reflect.MethodUtils; | ||
| import com.reginald.pluginm.utils.Logger; | ||
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| import android.app.Application; | ||
| import android.content.Context; | ||
| import android.content.ContextWrapper; | ||
| import android.content.pm.PackageManager; | ||
| import android.content.res.AssetManager; | ||
| import android.content.res.Resources; | ||
| import android.os.UserHandle; | ||
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| /** | ||
| * Created by lxy on 18-6-26. | ||
| * <p> | ||
| * 替换ActivityThread中的mInitialApplication的 base context。 | ||
| * 这个替换不是必须的，主要目的为hook系统通过ActivityThread获取到Context来进行插件资源获取，如： | ||
| * 1. RemoteViews的创建过程 | ||
| * 2. Webview中加载插件中的assets资源。 | ||
| * 。。。。 | ||
| * | ||
| */ | ||
| public class HostContext extends ContextWrapper { | ||
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| private static final String TAG = "HostContext"; | ||
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| private Context mBase; | ||
| private PluginManager mPluginManager; | ||
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| public static boolean install(Context appContext) { | ||
| Logger.d(TAG, "install()"); | ||
| Object target = ActivityThreadCompat.currentActivityThread(); | ||
| if (target != null) { | ||
| Class ActivityThreadClass = target.getClass(); | ||
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| try { | ||
| Field initApplicationField = FieldUtils.getField(ActivityThreadClass, "mInitialApplication"); | ||
| Application initApplication = (Application) FieldUtils.readField(initApplicationField, target); | ||
| Logger.d(TAG, "install() initApplication = " + initApplication); | ||
| Context baseContext = initApplication.getBaseContext(); | ||
| HostContext hostContext = new HostContext(baseContext); | ||
| Logger.d(TAG, "install() hostContext = " + hostContext); | ||
| FieldUtils.writeField(ContextWrapper.class, "mBase", initApplication, hostContext); | ||
| boolean isSuc = hostContext == initApplication.getBaseContext(); | ||
| Logger.d(TAG, "install() success? %b", isSuc); | ||
| return isSuc; | ||
| } catch (Exception e) { | ||
| Logger.e(TAG, "install() error!", e); | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| private HostContext(Context baseContext) { | ||
| super(baseContext); | ||
| mBase = baseContext; | ||
| mPluginManager = PluginManager.getInstance(); | ||
| } | ||
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| public Context createPackageContextAsUser(String packageName, int flags, UserHandle user) | ||
| throws PackageManager.NameNotFoundException { | ||
| Logger.d(TAG, "createPackageContextAsUser() packageName = " + packageName); | ||
| PluginInfo pluginInfo = mPluginManager.getLoadedPluginInfo(packageName); | ||
| if (pluginInfo != null) { | ||
| Logger.d(TAG, "createPackageContextAsUser() return plugin context for " + pluginInfo.packageName); | ||
| return pluginInfo.baseContext; | ||
| } | ||
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| try { | ||
| return (Context) MethodUtils.invokeMethod(mBase, "createPackageContextAsUser", packageName, flags, user); | ||
| } catch (Exception e) { | ||
| Logger.e(TAG, "createPackageContextAsUser()", e); | ||
| } | ||
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| return null; | ||
| } | ||
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| @Override | ||
| public Context createPackageContext(String packageName, int flags) throws PackageManager.NameNotFoundException { | ||
| PluginInfo pluginInfo = mPluginManager.getLoadedPluginInfo(packageName); | ||
| if (pluginInfo != null) { | ||
| Logger.d(TAG, "createPackageContext() return plugin context for " + pluginInfo.packageName); | ||
| return pluginInfo.baseContext; | ||
| } | ||
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| return super.createPackageContext(packageName, flags); | ||
| } | ||
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| @Override | ||
| public AssetManager getAssets() { | ||
| Logger.d(TAG, "getAssets() "); | ||
| List<PluginInfo> pluginInfos = mPluginManager.getLoadedPluginInfos(); | ||
| if (pluginInfos != null && !pluginInfos.isEmpty()) { | ||
| AssetManager combinedAssets = ResourcesManager.getCombinedAssetManager(mBase, pluginInfos); | ||
| if (combinedAssets != null) { | ||
| Logger.d(TAG, "getAssets() return combinedAssets = " + combinedAssets); | ||
| return combinedAssets; | ||
| } | ||
| } | ||
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| return super.getAssets(); | ||
| } | ||
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| @Override | ||
| public Resources getResources() { | ||
| List<PluginInfo> pluginInfos = mPluginManager.getLoadedPluginInfos(); | ||
| if (pluginInfos != null && !pluginInfos.isEmpty()) { | ||
| AssetManager combinedAssets = ResourcesManager.getCombinedAssetManager(mBase, pluginInfos); | ||
| if (combinedAssets != null) { | ||
| Logger.d(TAG, "getResources() return combinedResources "); | ||
| return ResourcesManager.createResources(mBase, combinedAssets); | ||
| } | ||
| } | ||
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| return super.getResources(); | ||
| } | ||
| } |
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