Develop Reference

How to check if my app is still running in an Android service?

I'm starting to develop an Android sticky service for my app with Delphi 10.1 Berlin, but I haven't found any tutorial or book that get into it, so I'm asking:
Which is the simplest way to detect if my app is still running or has been killed by the OS/user?

You can look for the process id by package name and see if it is still active.
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> pids = am.getRunningAppProcesses();
int processid = 0;
for (int i = 0; i < pids.size(); i++) {
ActivityManager.RunningAppProcessInfo info = pids.get(i);
if (info.processName.equalsIgnoreCase("packageNameSearchingFor")) {
processid = info.pid; //found it, we are running
}
}
Or you can simply store a shared value in public shared pref or database accessible through ContentProvider that is updated when in foreground or background to check. Either way is fine.

How to get number apps running in background

I am working on an app which needs the information of how many application running in background at the system,
I want to get number of them.
Any idea please ?

This Below lines give the list of Apps which are in background,
ActivityManager actvityManager = (ActivityManager)
this.getSystemService( ACTIVITY_SERVICE );
List<RunningAppProcessInfo> procInfos = actvityManager.getRunningAppProcesses();
procInfos.size() gives you number of apps

Stop background apps permanently Android

I am curious how apps like Task Managers & a specific app named Purify are able to permanently stop(force stop) background apps without requiring root permissions.
I searched & found a few ways but they were not efficient enough to stop all apps.
First method I found was to use KILLBACKGROUNDPROCESSES function but it was not able to kill all the background apps.
Secondly, I read about the SU FORCE STOP method but it requires root.
How are the apps able to do it without root?

Some Android applications can close other processes that are currently running in the background, not all process can be terminated. Some process even if terminated are restarted immediately. (You can try to close some from the 'application manager' and see for yourself).
You could try the following code that i compiled, it allows you to specify which processes that you may not want to kill.
// List of packages not to kill
List<String> reservedPackages = new ArrayList<String>();
reservedPackages.add("system");
reservedPackages.add("com.android.launcher2");
reservedPackages.add("com.android.inputmethod.latin");
reservedPackages.add("com.android.phone");
reservedPackages.add("com.android.wallpaper");
reservedPackages.add("com.google.process.gapps");
reservedPackages.add("android.process.acore");
reservedPackages.add("android.process.media");
//kill all except that in the list above
int processKillCounter = 0;
ActivityManager am = (ActivityManager) this.getBaseContext().getSystemService(Activity.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> listeProcessus = am.getRunningAppProcesses();
for(ActivityManager.RunningAppProcessInfo processus : listeProcessus) {
String packageName = processus.processName.split(":")[0];
if (!this.getBaseContext().getPackageName().equals(packageName) && !reservedPackages.contains(packageName)) {
am.restartPackage(packageName);
processKillCounter++;
}
}
mi = new ActivityManager.MemoryInfo();
activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
activityManager.getMemoryInfo(mi);
long afterBoostMemory = mi.availMem / 1048576L;
long boostedMemory = afterBoostMemory - availableMegs;
//Percentage can be calculated for API 16+
long percentAvail = mi.availMem / mi.totalMem;
Toast.makeText(this,"Phone Boosted, "+boostedMemory + " MB freed", Toast.LENGTH_LONG).show();

Android application info based on it's process name

I'm trying to find some info about apps I find using shell's top command. All I have is a process name (containing package name). Icon and app name would be perfect. I can't find any suitable soultion via google. Any help would be aprreciated;)
To be preemptive, I use top because it's the only way I found to show current processor usage. If someone's familiar with some more API friendly soultion, I'd be grateful.
Example process names I get are:
com.android.deskclock for desktop clock
com.creativemobile.DragRacing for game Drag Racing

Here how you get details. Since you have the package name, you can use it to get the corresponding application name, version, and icon.
List<PackageInfo> packagess = getPackageManager().getInstalledPackages(0);
for(int i=0;i<packagess.size();i++) {
PackageInfo pack = packagess.get(i);
if ((!getSysPackages) && (pack.versionName == null)) {
continue ;
}
//this is the application name
pack.applicationInfo.loadLabel(getPackageManager()).toString();
//this is the package name
pack.packageName;
//this is the version name
pack.versionName;
//this is the version code
pack.versionCode;
//this is the application icon
pack.applicationInfo.loadIcon(getPackageManager());
}

You can try out below code :
private String getTopActivity() {
ActivityManager mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> RunningTask = mActivityManager.getRunningTasks(1);
ActivityManager.RunningTaskInfo ar = RunningTask.get(30);
return ar.topActivity.getClassName().toString();
}
you have to give the permission of get task in the AndroidManifest.xml

Is there a way to get Process Ids of other 3rd party applications in Android...?

I have a requirement in my project where in i have to kill process of 3rd party application.
As i know Android can have multiple application running at a time, so can i get all those Process
Ids some how...

This class will help you to kill processes:
http://developer.android.com/reference/android/os/Process.html
This gives you a list of currently running processes:
ActivityManager.getRunningAppProcesses();
The list contains ActivityManager.RunningAppProcessInfo objects which store the pid. You can then kill the processes via
Process.killProcess(pid);
You need the proper permissions to do that. Android should throw an exception if you try to kill a process without the proper permissions and tell you what permission you need.

check this way if it solves your purpose:
ArrayList<PackageInfo> res = new ArrayList<PackageInfo>();
PackageManager pm = context.getApplicationContext().getPackageManager();
List<PackageInfo> packs = pm.getInstalledPackages(0);
packs.get(pos).gids;
packs.get(pos).sharedUserId;

You can get information about all running processes using ActivityManager. Refer following code:
ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<RunningAppProcessInfo> list = am.getRunningAppProcesses();
for (RunningAppProcessInfo proc : list) {
Log.v("Proccess", proc.processName + " : " + proc.pid);
}
Multiple applications can be running in the same process, so it would be better to use RunninAppProcessInfo.pkgList over RunninAppProcessInfo.processName.