android仅安装客户指定应用（高通KK_8x12平台）_高通 进程 白名单

前言：客户需要预置他们的应用为系统应用，并且除了他们的应用更新外，无法安装其他应用。

对于预置应用到/system/priv-app/下，可以在makefile中添加：
LOCAL_PRIVILEGED_MODULE := true

正文：
在安装应用时，通过白名单判断是否是用户指定需要安装的应用，如果是，则继续安装；如果不是，则返回未知来源，安装失败。
白名单由一个xml文件构成，放到/system/etc/下：

pkgname_filterlist.xml
<gapps-packages>
    <app package="com.customer.packagename"/>
</gapps-packages>
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安装的具体流程就不在这里赘述了，最后在PackageManagerService.java中判断：

PackageManagerService.java(/frameworks/base/services/java/com/android/server/pm/)
private void installPackageLI(InstallArgs args,
            boolean newInstall, PackageInstalledInfo res) {
    ...
    if (GET_CERTIFICATES && !pp.collectCertificates(pkg, parseFlags)) {
        res.returnCode = pp.getParseError();
        return;
    }
    // add {
    mFilterPkgNameList.clear();
    fillFilterPkgNameList();
    for (int i = 0; i < mFilterPkgNameList.size(); i++){
        if (pkg.packageName.contains(mFilterPkgNameList.get(i))){
           break;
        }
        if (i ==  mFilterPkgNameList.size() - 1){
            Slog.w(TAG, "Not allowed to install unknown apk!");
            res.returnCode = PackageManager.INSTALL_FAILED_UNKNOWN_SOURCES;
            return;
        }
    }
    // add }

    /* If the installer passed in a manifest digest, compare it now. */
    ...
}
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添加方法fillFilterPkgNameList()

private ArrayList<String>  mFilterPkgNameList = new ArrayList<String>();
private void fillFilterPkgNameList() {
    File configureDir = Environment.getRootDirectory();
    File gappsInfoDir = new File(configureDir, "etc/pkgname_filterlist.xml");
    FileInputStream stream = null;

    if (gappsInfoDir.exists()) {
        try {
            stream = new FileInputStream(gappsInfoDir);
            XmlPullParser parser = Xml.newPullParser();
            parser.setInput(stream, null);
            int type;
            do {
                type = parser.next();
                if (type == XmlPullParser.START_TAG) {
                    String tag = parser.getName();
                    if ("app".equals(tag)) {
                        String pkgName = parser.getAttributeValue(null, "package");
                        mFilterPkgNameList.add(pkgName);
                    }
                }
            } while (type != XmlPullParser.END_DOCUMENT);
        } catch (FileNotFoundException e) {
            Log.w(TAG, "FileNotFoundException " + gappsInfoDir, e);
        } catch (NullPointerException e) {
            Log.w(TAG, "NullPointerException " + gappsInfoDir, e);
        } catch (NumberFormatException e) {
            Log.w(TAG, "NumberFormatException " + gappsInfoDir, e);
        } catch (XmlPullParserException e) {
            Log.w(TAG, "XmlPullParserException " + gappsInfoDir, e);
        } catch (IOException e) {
            Log.w(TAG, "IOException " + gappsInfoDir, e);
        } catch (IndexOutOfBoundsException e) {
            Log.w(TAG, "IndexOutOfBoundsException " + gappsInfoDir, e);
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e) {
                    Log.w(TAG, "IOException " + gappsInfoDir, e);
                }
            }
        }
    }
}
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另外，为了方便客户，将未知来源默认勾选：

SecuritySettings.java(/packages/apps/Settings/src/com/android/settings/)
private PreferenceScreen createPreferenceHierarchy() {
    ...
    mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());
    ...
}

private boolean isNonMarketAppsAllowed() {
    return Settings.Global.getInt(getContentResolver(),
                            Settings.Global.INSTALL_NON_MARKET_APPS, 0) > 0;
}
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加载global变量：

DatabaseHelper.java(/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/)
loadBooleanSetting(stmt, Settings.Global.INSTALL_NON_MARKET_APPS,
                    R.bool.def_install_non_market_apps);
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def_install_non_market_apps定义在defaults.xml中（注意项目的overlay）

defaults.xml(/frameworks/base/packages/SettingsProvider/res/values/)
<bool name="def_install_non_market_apps">true</bool>
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