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POuninstall app silently with system privileges
 

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    <p>My app have system privileges. It will be inside firmware, now it's located at /system/app</p> <p>I was able to install apps silently with this post </p> <p><a href="https://stackoverflow.com/questions/6813322/install-uninstall-apks-programmatically-packagemanager-vs-intents">install / uninstall APKs programmatically (PackageManager vs Intents)</a></p> <p><strong>example app that works</strong></p> <p><a href="http://paulononaka.wordpress.com/2011/07/02/how-to-install-a-application-in-background-on-android/" rel="nofollow noreferrer">http://paulononaka.wordpress.com/2011/07/02/how-to-install-a-application-in-background-on-android/</a></p> <p>But I still can't uninstall apps the same way. I tried to use reflection like as in the installation example.</p> <pre><code>public ApplicationManager(Context context) throws SecurityException, NoSuchMethodException { observer = new PackageInstallObserver(); pm = context.getPackageManager(); Class&lt;?&gt;[] types = new Class[] {Uri.class, IPackageInstallObserver.class, int.class, String.class}; Class&lt;?&gt;[] uninstalltypes = new Class[] {String.class, IPackageInstallObserver.class, int.class}; method = pm.getClass().getMethod("installPackage", types); uninstallmethod = pm.getClass().getMethod("deletePackage", uninstalltypes); } public void uninstallPackage(String packagename) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { uninstallmethod.invoke(pm, new Object[] {packagename, observer, 0}); } public void installPackage(Uri apkFile) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { method.invoke(pm, new Object[] {apkFile, observer, INSTALL_REPLACE_EXISTING, null}); } </code></pre> <p>I have added uninstallPackage method and edited ApplicationManager method. Still cant get this working.</p> <p>When I run it I get method not found (on the invoke "deletePackage" line).</p> <p><strong>Here is not working project with my changes:</strong> <a href="https://dl.dropbox.com/u/1928109/InstallInBackgroundSample.zip" rel="nofollow noreferrer">https://dl.dropbox.com/u/1928109/InstallInBackgroundSample.zip</a></p> <p>Here is an description of function: <a href="http://www.androidjavadoc.com/1.0_r1_src/android/content/pm/PackageManager.html#deletePackage(java.lang.String" rel="nofollow noreferrer">http://www.androidjavadoc.com/1.0_r1_src/android/content/pm/PackageManager.html#deletePackage(java.lang.String</a>, android.content.pm.IPackageDeleteObserver, int)</p> <p>Parameters are ok. Seems like I should specify DeletePackageObserver class instead of InstallPackageObserver. But I don't know how to do that (I don't have such class).</p> <p>Thanks</p>
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    1. USAndrey Belykh
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      1. USMathias Conradt
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    1. COYou might want to post stack traced and/or any error/warning messages you get in logcat.
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      1. USNikolay Elenkov
    2. COIt says that deletePackage method not found
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    3. CO@POMATu is it necessary to have root access or rooted phone to perform silent install or delete using the code you have mentioned in the question.
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