Android Task Manager

The task manager can implement the following functions:

1. view all processes running in the current system

2. You can view the process number, version number, and memory usage of each process.

3. Kill the process (you can kill all the processes or kill the specified process)

4. view the remaining memory of the system

: Kill all processes

Implementation ideas:

The activitymanager class can obtain all the processes in the current system and the information of each process. It can also kill a process,

Activitymanager. getrunningappprocesses (); obtain all processes of the system

Activitymanager. getprocessmemoryinfo (PIDS); obtains the memory usage of each process based on the process number.

Activitymanager. restartpackage (processname); kill a process based on its package name

Packagemanager can obtain the program icons, version numbers, names, permissions, and signatures based on the package name.

Core code:

/** Obtain all processes and users' processes */protected void initdata () {runningappprocessinfos = activitymanager. getrunningappprocesses (); // obtain all processes userrunningappprocessinfos = new arraylist <activitymanager. runningappprocessinfo> (); // obtain the user's process for (INT I = 0; I <runningappprocessinfos. size (); I ++) {If ("system ". equals (runningappprocessinfos. get (I ). processname) | "android. process. media ". equals (runningappprocessinfos. get (I ). processname) | "android. process. acore ". equals (runningappprocessinfos. get (I ). processname) {continue;} userrunningappprocessinfos. add (runningappprocessinfos. get (I ));}}

Note: killing all processes actually kills all the processes of the user, and the system process cannot be killed. Therefore, we need to obtain all the processes of the user.

/** Get the memory occupied by a process */activitymanager AM = (activitymanager) getsystemservice (context. activity_service); int [] PIDs = {userrunningappprocessinfos. get (position ). PID}; android. OS. debug. memoryinfo [] memoryinfos = aM. getprocessmemoryinfo (PIDS); int memorysize = memoryinfos [0]. gettotalprivatedirty (); TV _app_memory.settext ("memory usage:" + memorysize + "kb ");

Public class taskinfo {context; packagemanager PM; Public taskinfo (context) {This. context = context; PM = context. getpackagemanager ();}/** query icon by package name */Public drawable getappicon (string packname) {try {applicationinfo info = PM. getapplicationinfo (packname, 0); Return info. loadicon (PM);} catch (namenotfoundexception e) {// todo auto-generated catch blocke. printstacktrace (); return NULL ;}/ ** get the program version */Public String getappversion (string packname) {try {packageinfo packinfo = PM. getpackageinfo (packname, 0); Return packinfo. versionname;} catch (namenotfoundexception e) {e. printstacktrace (); return NULL ;}/ ** get the program name */Public String getappname (string packname) {try {applicationinfo info = PM. getapplicationinfo (packname, 0); Return info. loadlabel (PM ). tostring ();} catch (namenotfoundexception e) {// todo auto-generated catch blocke. printstacktrace (); return NULL ;}/ ** get program permissions */Public String [] getapppremission (string packname) {try {packageinfo packinfo = PM. getpackageinfo (packname, packagemanager. get_permissions); // get all permissions return packinfo. requestedpermissions;} catch (namenotfoundexception e) {e. printstacktrace (); return NULL ;}/ ** obtain the program signature */Public String getappsignature (string packname) {try {packageinfo packinfo = PM. getpackageinfo (packname, packagemanager. get_signatures); // get all permissions return packinfo. signatures [0]. tocharsstring ();} catch (namenotfoundexception e) {e. printstacktrace (); return NULL ;}}}

/** Kill all processes */private void killall () {for (INT I = 0; I <userrunningappprocessinfos. size (); I ++) {system. out. println (userrunningappprocessinfos. get (I ). processname); activitymanager. restartpackage (userrunningappprocessinfos. get (I ). processname);} // update the displayed page PD. show (); New thread () {@ overridepublic void run () {initdata (); message MSG = new message (); MSG. what = get_running_app_finish; hander. sendmessage (MSG );}}. start ();}/** kill selected process */private void killselected () {for (INT I = 0; I <isselected. size (); I ++) {If (isselected. get (I) {// return true if the user is also selected // activitymanageractivitymanager is required to terminate an activity. restartpackage (userrunningappprocessinfos. get (I ). processname) ;}/// update the display PD of listview. show (); New thread () {@ overridepublic void run () {initdata (); message MSG = new message (); MSG. what = get_running_app_finish; hander. sendmessage (MSG );}}. start ();}

/** Get the remaining memory of the system */activitymanager AM = (activitymanager) getsystemservice (context. activity_service); memoryinfo outinfo = new activitymanager. memoryinfo (); AM. getmemoryinfo (outinfo); long availmemorysize = outinfo. availmem; string strmemorysize = availmemorysize/1024/1024 + "MB ";

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