Android偏好设置存到哪里了?

在Android L版本前,偏好设置,比如用什么打开图片,默认浏览器的设置,这些信息都是保存在packages.xml中了

但是L以及M上,发生了变化。在packages.xml中找不到这些配置了。


这里从源码中去进行查看。

首先在设置图片的默认打开方式时抓取log

05-04 07:47:29.179:I/BufferQueueProducer(449): [android/com.android.internal.app.ResolverActivity](this:0x7faa9f0000,id:108,api:2,p:14842,c:449)queueBuffer: fps=2.29 dur=21386.68 max=20584.78 min=13.74
05-04 07:47:29.180: V/SettingsProvider(997): call(system:sound_effects_enabled)for 0
05-04 07:47:29.180: D/SettingsProvider(997): lookupValue table system cachecontains Key sound_effects_enabled , value = Bundle[

{value=0}


05-04 07:47:29.184: I/PackageManager(997): Adding preferred activitycom.android.gallery3d/.app.GalleryActivity for user 0:
05-04 07:47:29.185: I/PackageManager(997): Action:"android.intent.action.VIEW"
05-04 07:47:29.185: I/PackageManager(997): Category:"android.intent.category.DEFAULT"
05-04 07:47:29.185: I/PackageManager(997): Type: "image/jpeg"



根据Adding preferred activity 发现

调用到了PackageManagerService.java里的addPreferredActivityInternal方法

private void addPreferredActivityInternal

-> scheduleWritePackageRestrictionsLocked(userId);

    voidscheduleWritePackageRestrictionsLocked(int userId) {

        if (!sUserManager.exists(userId))return;

        mDirtyUsers.add(userId);

        if(!mHandler.hasMessages(WRITE_PACKAGE_RESTRICTIONS)) {

            mHandler.sendEmptyMessageDelayed(WRITE_PACKAGE_RESTRICTIONS,WRITE_SETTINGS_DELAY);

        }

    }

查找WRITE_PACKAGE_RESTRICTIONS

->

caseWRITE_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;

 

./frameworks/base/services/core/java/com/android/server/pm/Settings.java

-> classSettings {

->     private static final String TAG ="PackageSettings";

void writePackageRestrictionsLPr(int userId)

        File userPackagesStateFile =getUserPackagesStateFile(userId);

        File backupFile =getUserPackagesStateBackupFile(userId);

//

Log.d(TAG,"=====userPackagesStateFile=" + userPackagesStateFile.getAbsolutePath());

Log.d(TAG,"=====backupFile=" + backupFile.getAbsolutePath());

 

log

01-01 15:12:28.530: I/PackageManagerService(1064):Adding preferred activity com.google.android.apps.photos/.pager.HostPhotoPagerActivityfor user 0:

01-01 15:12:28.530:I/PackageManagerService(1064):   Action:"android.intent.action.VIEW"

01-01 15:12:28.530:I/PackageManagerService(1064):  Category: "android.intent.category.DEFAULT"

01-01 15:12:28.530:I/PackageManagerService(1064):   Type:"image/jpeg"

01-01 15:12:28.530:I/PackageManagerService(1064):  AutoVerify=false

01-01 15:12:28.535: I/PackageSettings(1064):Writing package restrictions for user=0

01-01 15:12:28.535: D/PackageSettings(1064): =====userPackagesStateFile=/data/system/users/0/package-restrictions.xml

01-01 15:12:28.535: D/PackageSettings(1064):=====backupFile=/data/system/users/0/package-restrictions-backup.xml


这样就找到了写设置的文件 /data/system/users/0/package-restrictions.xml

./frameworks/base/services/core/java/com/android/server/pm/Settings.java里有其读写的细节


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