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原創(chuàng)內(nèi)容，轉(zhuǎn)載請(qǐng)注明出處，多謝配合。

經(jīng)過(guò)前面三篇文章的分析，基本上對(duì)Apk的安裝流程有了個(gè)大體的了解。

再來(lái)一張圖回顧下整個(gè)大框架：

下面簡(jiǎn)單來(lái)實(shí)驗(yàn)下安裝微信：

我選擇在應(yīng)用市場(chǎng)安裝微信，流程是先下載再安裝，多個(gè)應(yīng)用的場(chǎng)景下是并行下載，串行安裝。

根據(jù)安裝流程粗分為三步：

一、復(fù)制Apk
三方應(yīng)用安裝在data/app下，這個(gè)是系統(tǒng)目錄，直接看復(fù)制之后的結(jié)果：

/data/app # ls -al
drwxr-xr-x  4 system system 4096 2019-07-19 13:45 com.tencent.mm-jIsm1s1QsgU_5Q6XcQFYfA==

/data/app/com.tencent.mm-jIsm1s1QsgU_5Q6XcQFYfA== # ls -al
-rw-r--r--  1 system system  111405470 2019-07-19 13:45 base.apk //主apk在這
drwxr-xr-x  3 system system       4096 2019-07-19 13:45 lib //so庫(kù)文件
drwxrwx--x  3 system install      4096 2019-07-19 13:45 oat //dex文件

另外還有兩個(gè)APP自己私有目錄在這里一并說(shuō)下：

內(nèi)部存儲(chǔ)：
/data/data # ls -al
drwx------  18 u0_a167        u0_a167         4096 2019-07-19 15:08 com.tencent.mm

外部存儲(chǔ)：
/sdcard/Android/data # ls -al
drwxrwx--x  3 u0_a167    sdcard_rw 4096 2019-07-19 13:55 com.tencent.mm

點(diǎn)擊應(yīng)用管理的清除全部數(shù)據(jù)：
data/data/com.tencent.mm 目錄還在，內(nèi)部文件全部被清理掉
/sdcard/Android/data/com.tencent.mm 目錄被刪除

點(diǎn)擊應(yīng)用管理的清除緩存：
data/data/com.tencent.mm 目錄還在，內(nèi)部子文件夾也在，這就是只清理緩存
/sdcard/Android/data/com.tencent.mm 目錄還在

二、安裝Apk

安裝的本質(zhì)是pull解析AndroidManifext.xml，按組件分類保存在Package數(shù)據(jù)結(jié)構(gòu)中，最后通過(guò)Settings將所有安裝app的信息，當(dāng)系統(tǒng)進(jìn)行程序安裝、卸載和更新等操作時(shí)，均會(huì)更新該文件。通過(guò)readLPw()函數(shù)和writeLPr函數(shù)分別來(lái)讀寫packages.xml。

packages.xml 記錄所有安裝app的信息，當(dāng)系統(tǒng)進(jìn)行程序安裝、卸載和更新等操作時(shí)，均會(huì)更新該文件。
packages-backup.xml 備份文件
packages-stopped.xml 記錄被用戶強(qiáng)行停止的應(yīng)用的Package信息
packages-stopped-backup.xml 備份文件
packages.list 記錄非系統(tǒng)自帶的APK的數(shù)據(jù)信息，這些APK有變化時(shí)會(huì)更新該文件

當(dāng)系統(tǒng)啟動(dòng)、升級(jí)或者有APK安裝、升級(jí)、刪除時(shí)會(huì)重新scan，有變化會(huì)更新文件信息。這些xml文件相當(dāng)于是安裝解析之后得到的PackageParser.Package的持久化存儲(chǔ)方案。

挑一個(gè)packages.xml pull出來(lái)看看：
adb root
adb disable-verity
adb reboot
adb root
adb remount
adb pull /data/system/packages.xml .

微信相關(guān)的：

<package name="com.tencent.mm" codePath="/data/app/com.tencent.mm-jIsm1s1QsgU_5Q6XcQFYfA==" nativeLibraryPath="/data/app/com.tencent.mm-jIsm1s1QsgU_5Q6XcQFYfA==/lib" primaryCpuAbi="armeabi-v7a" publicFlags="941112900" privateFlags="0" ft="16c08c37d08" it="16c08c387b2" ut="16c08c387b2" version="1440" userId="10167" installer="com.xiaomi.market">
        <sigs count="1" schemeVersion="1">
            <cert index="12" key="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" />
        </sigs>
        <perms>
            <item name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" granted="true" flags="0" />
            <item name="com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE" granted="true" flags="0" />
            <item name="com.google.android.c2dm.permission.RECEIVE" granted="true" flags="0" />
            <item name="android.permission.MODIFY_AUDIO_SETTINGS" granted="true" flags="0" />
            <item name="android.permission.ACCESS_NOTIFICATION_POLICY" granted="true" flags="0" />
            <item name="android.permission.MANAGE_ACCOUNTS" granted="true" flags="0" />
            <item name="com.tencent.mm.matrix.strategynotify" granted="true" flags="0" />
            <item name="android.permission.NFC" granted="true" flags="0" />
            <item name="android.permission.FOREGROUND_SERVICE" granted="true" flags="0" />
            <item name="android.permission.WRITE_SYNC_SETTINGS" granted="true" flags="0" />
            <item name="android.permission.RECEIVE_BOOT_COMPLETED" granted="true" flags="0" />
            <item name="com.tencent.mm.permission.MM_MESSAGE" granted="true" flags="0" />
            <item name="com.android.launcher.permission.UNINSTALL_SHORTCUT" granted="true" flags="0" />
            <item name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" granted="true" flags="0" />
            <item name="android.permission.READ_PROFILE" granted="true" flags="0" />
            <item name="android.permission.BLUETOOTH" granted="true" flags="0" />
            <item name="android.permission.CHANGE_WIFI_MULTICAST_STATE" granted="true" flags="0" />
            <item name="android.permission.GET_TASKS" granted="true" flags="0" />
            <item name="android.permission.AUTHENTICATE_ACCOUNTS" granted="true" flags="0" />
            <item name="android.permission.INTERNET" granted="true" flags="0" />
            <item name="com.android.vending.BILLING" granted="true" flags="0" />
            <item name="android.permission.BLUETOOTH_ADMIN" granted="true" flags="0" />
            <item name="android.permission.GET_PACKAGE_SIZE" granted="true" flags="0" />
            <item name="com.tencent.mm.plugin.permission.READ" granted="true" flags="0" />
            <item name="com.tencent.mm.wear.message" granted="true" flags="0" />
            <item name="com.tencent.mm.ext.permission.WRITE" granted="true" flags="0" />
            <item name="com.android.launcher.permission.READ_SETTINGS" granted="true" flags="0" />
            <item name="android.permission.BROADCAST_STICKY" granted="true" flags="0" />
            <item name="android.permission.CHANGE_WIFI_STATE" granted="true" flags="0" />
            <item name="android.permission.FLASHLIGHT" granted="true" flags="0" />
            <item name="android.permission.ACCESS_NETWORK_STATE" granted="true" flags="0" />
            <item name="miui.permission.READ_STEPS" granted="true" flags="0" />
            <item name="com.tencent.mm.permission.C2D_MESSAGE" granted="true" flags="0" />
            <item name="android.permission.USE_FINGERPRINT" granted="true" flags="0" />
            <item name="android.permission.READ_SYNC_SETTINGS" granted="true" flags="0" />
            <item name="com.tencent.mm.plugin.permission.WRITE" granted="true" flags="0" />
            <item name="android.permission.VIBRATE" granted="true" flags="0" />
            <item name="android.permission.ACCESS_WIFI_STATE" granted="true" flags="0" />
            <item name="com.android.launcher.permission.INSTALL_SHORTCUT" granted="true" flags="0" />
            <item name="android.permission.WAKE_LOCK" granted="true" flags="0" />
            <item name="com.tencent.mm.ext.permission.READ" granted="true" flags="0" />
        </perms>
        <proper-signing-keyset identifier="32" />
    </package>

主要還是權(quán)限

這里就不對(duì)每個(gè)xml一一分析了。
詳細(xì)信息可以dumpsys package com.tencent.mm查看。

三、編譯Apk

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

public void dexopt(String apkPath, int uid, @Nullable String pkgName, String instructionSet,
int dexoptNeeded, @Nullable String outputPath, int dexFlags,
String compilerFilter, @Nullable String volumeUuid, @Nullable String sharedLibraries,
@Nullable String seInfo, boolean downgrade, int targetSdkVersion,
@Nullable String profileName, @Nullable String dexMetadataPath,
@Nullable String compilationReason) throws InstallerException {
    Slog.i(TAG,"installdebug: getCallers:"+ Debug.getCallers(20)+"; apkPath:"+apkPath+"; pkgName: "+pkgName+"; compileFilter: "+compilerFilter);
assertValidInstructionSet(instructionSet);
if (!checkBeforeRemote()) return;
try {
        mInstalld.dexopt(apkPath, uid, pkgName, instructionSet, dexoptNeeded, outputPath,
dexFlags, compilerFilter, volumeUuid, sharedLibraries, seInfo, downgrade,
targetSdkVersion, profileName, dexMetadataPath, compilationReason);
} catch (Exception e) {
        throw InstallerException.from(e);
}
}

這里加了個(gè)Log，打印信息如下:

07-19 13:45:27.855 1501 1596 I Installer: installdebug: getCallers:
com.android.server.pm.PackageDexOptimizer.dexOptPath:305
com.android.server.pm.PackageDexOptimizer.performDexOptLI:253
com.android.server.pm.PackageDexOptimizer.performDexOpt:149
com.android.server.pm.PackageManagerService.installPackageLI:18215
com.android.server.pm.PackageManagerService.installPackageTracedLI:17635
com.android.server.pm.PackageManagerService.access$3300:407
com.android.server.pm.PackageManagerService$10.run:15465
android.os.Handler.handleCallback:873
android.os.Handler.dispatchMessage:99
android.os.Looper.loop:201
android.os.HandlerThread.run:65
com.android.server.ServiceThread.run:44
就是之前介紹的流程

apkPath:    /data/app/com.tencent.mm-jIsm1s1QsgU_5Q6XcQFYfA==/base.apk;
pkgName:   com.tencent.mm;
compileFilter:  quicken  編譯方式為quicken

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