forceStopPackage与killBackgroundProcesses方法
2024-08-30 19:45:12
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:
- /**
- * 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:
- /**
- * 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:
- 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
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