forceStopPackage与killBackgroundProcesses方法

时间：2017-11-22 20:11:06 阅读：255 评论：0 收藏：0 [点我收藏+]

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最近了解一键清理功能，需要实现强制关闭进程的功能。下面介绍下killBackgroundProcesses()方法和forceStopPackage()方法。

killBackgroundProcesses()

ActivityManager的killBackgroundProcesses方法，可以立即杀死与指定包相关联的所有后台进程，这与内核杀死那些进程回收内存是一样的，但这些进程如果在将来某一时刻需要使用，会重新启动。该方法需要权限android.permission.KILL_BACKGROUND_PROCESSES。源码解释如下：

[java] view plain copy

/**
* Have the system immediately kill all background processes associated
* with the given package. This is the same as the kernel killing those
* processes to reclaim memory; the system will take care of restarting
* these processes in the future as needed.
*
* <p>You must hold the permission
* {@link android.Manifest.permission#KILL_BACKGROUND_PROCESSES} to be able to
* call this method.
*
* @param packageName The name of the package whose processes are to
* be killed.
*/
public void killBackgroundProcesses(String packageName) {
try {
ActivityManagerNative.getDefault().killBackgroundProcesses(packageName,
UserHandle.myUserId());
} catch (RemoteException e) {
}
}

forceStopPackage()

调用此方法，系统会强制停止与指定包关联的所有事情，将会杀死使用同一个uid的所有进程，停止所有服务，移除所有activity。所有注册的定时器和通知也会移除。forceStopPackage方法源码解释如下：

[java] view plain copy

/**
* Have the system perform a force stop of everything associated with
* the given application package. All processes that share its uid
* will be killed, all services it has running stopped, all activities
* removed, etc. In addition, a {@link Intent#ACTION_PACKAGE_RESTARTED}
* broadcast will be sent, so that any of its registered alarms can
* be stopped, notifications removed, etc.
*
* <p>You must hold the permission
* {@link android.Manifest.permission#FORCE_STOP_PACKAGES} to be able to
* call this method.
*
* @param packageName The name of the package to be stopped.
* @param userId The user for which the running package is to be stopped.
*
* @hide This is not available to third party applications due to
* it allowing them to break other applications by stopping their
* services, removing their alarms, etc.
*/
public void forceStopPackageAsUser(String packageName, int userId) {
try {
ActivityManagerNative.getDefault().forceStopPackage(packageName, userId);
} catch (RemoteException e) {
}
}
/**
* @see #forceStopPackageAsUser(String, int)
* @hide
*/
public void forceStopPackage(String packageName) {
forceStopPackageAsUser(packageName, UserHandle.myUserId());
}

注意使用forceStopPackage方法时，需要添加权限android.permission.FORCE_STOP_PACKAGES。同时注意该方法是隐藏的方法，需要使用反射机制调用。如下：

[java] view plain copy

ActivityManager mActivityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
Method method = Class.forName("android.app.ActivityManager").getMethod("forceStopPackage", String.class);
method.invoke(mActivityManager, packageName); //packageName是需要强制停止的应用程序包名

forceStopPackage与killBackgroundProcesses方法

标签：rms article iss ges 机制 sdn comment ide broadcast

原文地址：http://www.cnblogs.com/Free-Thinker/p/7880343.html

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