Android Setup Wizard setComponentEnabledSetting 调用过程

最新推荐文章于 2025-05-26 08:40:02 发布

原创最新推荐文章于 2025-05-26 08:40:02 发布 · 3.6k 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#android #setComponentEnabledS

Android 专栏收录该内容

38 篇文章

订阅专栏

Author:Kevin Xu

Email:13570805860@163.com

QQ&Wechat:1922656999

Date：2016年11月28日

1.Setup Wizard 调用方法


PackageManager pm = mActivity.getPackageManager();
pm.setComponentEnabledSetting(name,PackageManager.COMPONENT_ENABLED_STATE_DISABLED,PackageManager.DONT_KILL_APP);
//Kevin Note:此处主要以COMPONENT_ENABLED_STATE_DISABLED 来分析

2.setComponentEnabledSetting 的由来

@File:
MM/frameworks/base/core/java/android/content/pm/PackageManager.java
publicabstractvoid setComponentEnabledSetting(ComponentName componentName,
int newState,int flags);

@file:
MM/frameworks/base/core/java/android/app/ApplicationPackageManager.java
finalclassApplicationPackageManagerextendsPackageManager{
@Override
publicvoid setComponentEnabledSetting(ComponentName componentName,
int newState,int flags){
try{
            mPM.setComponentEnabledSetting(componentName, newState, flags, mContext.getUserId());
}catch(RemoteException e){
// Should never happen!
}
}

4.mPM 的本体

@file:
MM/frameworks/base/core/java/android/app/ApplicationPackageManager.java
ApplicationPackageManager(ContextImpl context,
IPackageManager pm){
        mContext = context;
        mPM = pm;
}
@file:
MM/frameworks/base/core/java/android/app/ContextImpl.java
@Override
publicPackageManager getPackageManager(){
if(mPackageManager !=null){
return mPackageManager;
}
IPackageManager pm =ActivityThread.getPackageManager();
if(pm !=null){
// Doesn't matter if we make more than one instance.
return(mPackageManager =newApplicationPackageManager(this, pm));
}
returnnull;
}
@file:
MM/frameworks/base/core/java/android/app/ActivityThread.java
publicstaticIPackageManager getPackageManager(){
if(sPackageManager !=null){
//Slog.v("PackageManager", "returning cur default = " + sPackageManager);
return sPackageManager;
}
IBinder b =ServiceManager.getService("package");
//Slog.v("PackageManager", "default service binder = " + b);
        sPackageManager =IPackageManager.Stub.asInterface(b);
//Slog.v("PackageManager", "default service = " + sPackageManager);
return sPackageManager;
}

如上代码可以看出mPM 是PackageManagerService

5.PackageManagerService 的setComponentEnabledSetting

@file:
MM/frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
@Override
publicvoid setComponentEnabledSetting(ComponentName componentName,
int newState,int flags,int userId){
if(!sUserManager.exists(userId))return;
        setEnabledSetting(componentName.getPackageName(),
                componentName.getClassName(), newState, flags, userId,null);
}
privatevoid setEnabledSetting(finalString packageName,String className,int newState,
finalint flags,int userId,String callingPackage){
...
PackageSetting pkgSetting;
pkgSetting = mSettings.mPackages.get(packageName);
case COMPONENT_ENABLED_STATE_DISABLED:
if(!pkgSetting.disableComponentLPw(className, userId)){
return;
}
break;
scheduleWritePackageRestrictionsLocked(userId);

6. pkgSetting.disableComponentLPw

@File:
MM/frameworks/base/services/core/java/com/android/server/pm/PackageSetting.java
finalclassPackageSettingextendsPackageSettingBase{
@File:
MM/frameworks/base/services/core/java/com/android/server/pm/PackageSettingBase.java
boolean disableComponentLPw(String componentClassName,int userId){
PackageUserState state = modifyUserStateComponents(userId,true,false);
boolean changed = state.enabledComponents !=null
? state.enabledComponents.remove(componentClassName):false;
        changed |= state.disabledComponents.add(componentClassName);
return changed;
}
MM/frameworks/base/core/java/android/content/pm/PackageUserState.java
publicArraySet<String> disabledComponents;

7.scheduleWritePackageRestrictionsLocked(userId);

@File:
MM/frameworks/base/services/core/java/com/android/server/pm/PackageSettingBase.java

scheduleWritePackageRestrictionsLocked(userId);
void scheduleWritePackageRestrictionsLocked(int userId){
if(!sUserManager.exists(userId))return;
        mDirtyUsers.add(userId);
if(!mHandler.hasMessages(WRITE_PACKAGE_RESTRICTIONS)){
            mHandler.sendEmptyMessageDelayed(WRITE_PACKAGE_RESTRICTIONS, WRITE_SETTINGS_DELAY);
}
}
case WRITE_PACKAGE_RESTRICTIONS:{
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
synchronized(mPackages){
                        removeMessages(WRITE_PACKAGE_RESTRICTIONS);
for(int userId : mDirtyUsers){
                            mSettings.writePackageRestrictionsLPr(userId);
}
                        mDirtyUsers.clear();
}
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
}break;

8.Settings.writePackageRestrictionsLPr

@file:
MM/frameworks/base/core/java/com/android/server/pm/Settings.java
void writePackageRestrictionsLPr(int userId){
File userPackagesStateFile = getUserPackagesStateFile(userId);
privateFile getUserPackagesStateFile(int userId){
// TODO: Implement a cleaner solution when adding tests.
// This instead of Environment.getUserSystemDirectory(userId) to support testing.
File userDir =newFile(newFile(mSystemDir,"users"),Integer.toString(userId));
returnnewFile(userDir,"package-restrictions.xml");
//kevin Note:文件路径为/data/system/users/0/package-restrictions.xml
}

经过如上的调用，将对应的数据写入/data/system/users/0/package-restrictions.xml

但是此处会有一个延时，

static final int WRITE_SETTINGS_DELAY = 10*1000; // 10 seconds

如果在未写入时，就关机，会产生下次开机还进行设置向导的问题。

解决办法:

在数据设置成功，直接写数据文件。

在如下的位置进行增加：

case COMPONENT_ENABLED_STATE_DISABLED: if (!pkgSetting.disableComponentLPw(className, userId)) { return; }else{
mSettings.writePackageRestrictionsLPr(userId);
} break;