> > How does the process for retrieving system rights look like? Its a matter of signatures. Whoever signs the system is also going to need to sign any app that wants system privileges.
> I suppose this problem > shouldn't exist if I was able to save the .apk file in the private > directory of my application and then invoke the system install UI on > the file. Well, no, you can't have your cake and eat it to. The package manager needs to be able to read the APK file to install the app. In order to do this you need to place the APK in a world-readable location because you can't have the same UID or GID as the package manager. No matter what you do, if you want to allow the package manager to read the file, everyone can. Now, if you put the file in your private directory and set the mode to MODE_WORLD_READABLE, the package manager may be able to read the file, I think it should be able to. Everyone else can, but they would have to know the exact path because I don't believe they can list the directory in which the file resides. Now, regardless of where the APK is placed, you should probably delete it after installation, otherwise you're at least doubling storage space required per application. If you delete the APK after its installed, you also fix your "install only to device downloaded on". Cheers, Justin Android Team @ Google On Jul 2, 3:48 am, calleandersson <[email protected]> wrote: > I have been testing with the 'file://' prefix and got the following > results: > > When saving an .apk file in the private directory of my application > and trying to invoke the system installation UI, an parse error > occured due to permission issues: > 07-02 07:15:27.826: WARN/zipro(726): Unable to open zip '/data/data/ > test.calle.helloworld/files/AndroidHelloWorld.apk': Permission denied > 07-02 07:15:27.826: DEBUG/asset(726): failed to open Zip archive '/ > data/data/test.calle.helloworld/files/AndroidHelloWorld.apk' > 07-02 07:15:27.846: WARN/PackageParser(726): Unable to read > AndroidManifest.xml of /data/data/test.calle.helloworld/files/ > AndroidHelloWorld.apk > 07-02 07:15:27.846: WARN/PackageParser(726): > java.io.FileNotFoundException: AndroidManifest.xml > ... > 07-02 07:15:27.856: WARN/PackageInstaller(726): Parse error when > parsing manifest. Discontinuing installation > > When I saved the .apk file on the SD card, everything went as supposed > and the system installation UI was displayed. > > So far so good. However, I only want a downloaded .apk file to be > installed on the same phone which downloaded it. If the application is > placed on the SD card, wouldn't it be possible to use the same SD card > in another phone (or copy the .apk file to another SD card used by > another phone) and install the application on that phone too? Am I > correct in these assumtions? > > With regards to what I wrote above, is it somehow possible to restrict > an application file from beeing installed on any other phone except > the very same phone which downloaded the .apk file (using my > application)? Is system rights needed? I suppose this problem > shouldn't exist if I was able to save the .apk file in the private > directory of my application and then invoke the system install UI on > the file. > > Regards, > Calle > > On 1 Juli, 18:22, calleandersson <[email protected]> wrote: > > > > > Hi Justin, > > > Thanks for the tips about the 'file://' prefix and SD card, I will > > look into that tomorrow. > > > How does the process for retrieving system rights look like? Is it the > > manufacturer of an Android device which decides if an application > > should have system rights? I suppose that that kind of clients must be > > installed/included in the device before it is released or am I wrong? > > > Is there somehow possible to simulate that an application has system > > rights in the Emulator? > > > By the way, I was thinking of using the same Intent code to start an > > already installed application but, currently, I'm using the following > > code which seems to work pretty well (and the class name doesn't need > > to be specified): > > Intent intent = getPackageManager().getLaunchIntentForPackage > > (packageName); > > startActivity(intent); > > > Regards, > > Calle > > > On 1 Juli, 17:18, "Justin (Google Employee)" <[email protected]> wrote: > > > > The package manager way will not work, you need the permission you > > > referenced, INSTALL_PACKAGES, which only the system has and is not > > > obtainable by user-installed applications. > > > > I think your Intent-based method should work, I believe this is more > > > or less what the browser does when you download an APK from the > > > internet. I have two thoughts. First, you haven't specified a proper > > > Uri, you've specified a file path, try file:///data/data/... Second, > > > I'm not sure you can place the file in your app's private directory > > > and have this work, to remove this variable, try placing the APK on > > > the SD card. > > > > As far as removing packages, I'm not sure, I'm not sure what Intent > > > you would use to do this, although certainly some Intent exists, > > > albeit probably private/undocumented. You could watch the logcat > > > output when you go into the application manager from settings. > > > > Cheers, > > > Justin > > > Android Team @ Google > > > > On Jul 1, 6:22 am, calleandersson <[email protected]> wrote: > > > > > Hi, > > > > > I am going to create an application (using Android 1.5) which can > > > > download and install other applications and also be able to remove > > > > these applications when needed. I have tried to do this in two > > > > different ways but havn't had any success: > > > > > -- A: the PackageManager way -- > > > > > Using the following code: > > > > > getPackageManager().installPackage(Uri.parse(url)); > > > > > an SecurityException occur since (as I understand) it isn't possible > > > > for an application to be granted the INSTALL_PACKAGES permission > > > > (which is needed by the installPackage() method) unless the program > > > > has system rights. > > > > > A1. Is it correct that system rights is needed by an application to be > > > > granted INSTALL_PACKAGES permission? > > > > > A2. How can an application acquire system rights? > > > > > A3. Will this approach generate some kind of platform specific install > > > > popups (or something like that) or could an application be installed > > > > without any user interaction required? > > > > > -- B: the Intent way -- > > > > > I download an .apk-file using code similar to the following code: > > > > > URL sourceUrl = new URL(source); > > > > Object data = sourceUrl.getContent(); > > > > String fileName = sourceUrl.getFile().substring(fileName.lastIndexOf > > > > ('/') + 1); > > > > // create/open file in the 'data/data/<app namespace>/files' directory > > > > FileOutputStream fos = openFileOutput(fileName, Context.MODE_PRIVATE); > > > > int read = 0; > > > > byte[] buffer = new byte[512]; > > > > BufferedInputStream bis = new BufferedInputStream((InputStream) data); > > > > do{ > > > > read = bis.read(buffer); > > > > if(read > 0){ > > > > fos.write(buffer, 0, read); > > > > } > > > > > }while(read != -1); > > > > > and then i try to invoke an installation of the application by using > > > > the following code (which I belive should bring the system UI up for > > > > the user to confirm the install): > > > > > Intent intent = new Intent(); > > > > intent.setAction(android.content.Intent.ACTION_VIEW); > > > > intent.setDataAndType(Uri.parse("/data/data/test.calle.helloworld/ > > > > files/AndroidHelloWorld.apk"), "application/vnd.android.package- > > > > archive"); > > > > startActivity(intent); > > > > > but this only generates an ActivityNotFoundException: > > > > 07-01 10:11:05.354: ERROR/AndroidRuntime(2480): > > > > android.content.ActivityNotFoundException: No Activity found to handle > > > > Intent { action=android.intent.action.VIEW data=/data/data/ > > > > test.calle.helloworld/files/AndroidHelloWorld.apk type=application/ > > > > vnd.android.package-archive } > > > > > B1. What am I doing wrong/missing in the attempt to install the > > > > downloaded application? > > > > > B2. Will this approach bring the system UI up (for the user to confirm > > > > the install) or have I misunderstood something? > > > > > B3. Could I use the same Intent code to start an already installed > > > > application or do I need change some input data? > > > > > B4. Is it possible to initiate an uninstall of an application with a > > > > similar approach (without beeing granted the REMOVE_PACKAGES > > > > permission)? > > > > > B5. Is there some cleaner/easier way of downloading an entire file > > > > from the internet to the file system and should I use > > > > 'Context.MODE_PRIVATE' when I call the openFileOutput() method?- Dölj > > > > citerad text - > > > > - Visa citerad text -- Dölj citerad text - > > > - Visa citerad text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
