Android允许应用具有安装权限

Posted 2022-12-07 peak wang

     本文只针对调用PackageInstaller安装流程，ROM中有时需要集成一些第三方的应用商城或着launcher,但需要此应用可能具有安装权限,像大部分机顶盒设备，投影设备禁止安装未知来源的控制对用户是不可见的，功能很简单直接贴代码;

     PackageInstallerActivity中有个checkIfAllowedAndInitiateInstall()函数来判断是否允许安装，允许的话会调用initiateInstall()弹出安装应用的界面，禁止安装未知来源的应用时会弹出禁止安装未知来源的dialog;

     PackageInstallerActivity中有个变量mOriginatingPackage，此变量就是调用安装应用事件的应用的包名,只需在initiateInstall()的if判断中加入自己的判断逻辑即可。

/**
*检查是否允许安装包，如果允许，则启动安装。如果不允许
*显示相应的对话框。
*/
    private void checkIfAllowedAndInitiateInstall() 
        // Check for install apps user restriction first.
        final int installAppsRestrictionSource = mUserManager.getUserRestrictionSource(
                UserManager.DISALLOW_INSTALL_APPS, Process.myUserHandle());
        if ((installAppsRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) 
            showDialogInner(DLG_INSTALL_APPS_RESTRICTED_FOR_USER);
            return;
         else if (installAppsRestrictionSource != UserManager.RESTRICTION_NOT_SET) 
            startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));
            finish();
            return;
        
        //看这里的判断条件1.允许安装未知来源应用 2.非未知来源应用发起的安装事件
        //3.这是我加的逻辑
        if (mAllowUnknownSources || !isInstallRequestFromUnknownSource(getIntent()) || new StmConfig().isUserCustomAllowInstallPkg(mOriginatingPackage)) 
            initiateInstall();
         else 
            // Check for unknown sources restriction
            final int unknownSourcesRestrictionSource = mUserManager.getUserRestrictionSource(
                    UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES, Process.myUserHandle());
            if ((unknownSourcesRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) 
                showDialogInner(DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER);
             else if (unknownSourcesRestrictionSource != UserManager.RESTRICTION_NOT_SET) 
                startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));
                finish();
             else 
                handleUnknownSources();