Android偏好设置存到哪里了？

来源：互联网发布：购买海关数据编辑：程序博客网时间：2024/05/01 12:48

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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