這是不可能的非平臺(第三方)的應用程序:你必須安裝要求直接PackageManager。
PackageManager具有非公開的API,installPackage()(截至記者發稿行2584):
/**
* @hide
*
* Install a package. Since this may take a little while, the result will
* be posted back to the given observer. An installation will fail if the calling context
* lacks the {@link android.Manifest.permission#INSTALL_PACKAGES} permission, if the
* package named in the package file's manifest is already installed, or if there's no space
* available on the device.
*
* @param packageURI The location of the package file to install. This can be a 'file:' or a
* 'content:' URI.
* @param observer An observer callback to get notified when the package installation is
* complete. {@link IPackageInstallObserver#packageInstalled(String, int)} will be
* called when that happens. observer may be null to indicate that no callback is desired.
* @param flags - possible values: {@link #INSTALL_FORWARD_LOCK},
* {@link #INSTALL_REPLACE_EXISTING}, {@link #INSTALL_ALLOW_TEST}.
* @param installerPackageName Optional package name of the application that is performing the
* installation. This identifies which market the package came from.
*/
public abstract void installPackage(
Uri packageURI, IPackageInstallObserver observer, int flags,
String installerPackageName);
其中可能的標誌之一是INSTALL_ALLOW_DOWNGRADE
:
/**
* Flag parameter for {@link #installPackage} to indicate that it is okay
* to install an update to an app where the newly installed app has a lower
* version code than the currently installed app.
*
* @hide
*/
public static final int INSTALL_ALLOW_DOWNGRADE = 0x00000080;
所有這些API是隱性的,第三方應用無法訪問。現在,您可以嘗試反思,但我非常肯定平臺會限制對它們的訪問。
如果這讓您的企業客戶感到不安,就像我的企業客戶一樣,請在此列出問題:https://code.google .com/p/android/issues/detail?id = 62545 –