Android-enabled Service to prevent system Recycle

MainActivity is as follows:

Package cc. c; import java. util. list; import android. OS. bundle; import android. OS. process; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. app. activity; import android. app. activityManager; import android. app. activityManager. runningAppProcessInfo; import android. app. activityManager. runningTaskInfo; import android. content. componentName; import android. content. context;/*** Demo Description: * implements a Service to prevent the Service from being recycled by the system. * In some cases, the Service will be killed by the system. I have found many methods on the Internet. Although they all claim that * can be recycled by the system, it seems that they are not reliable enough. * Another method is provided here. The idea is: * use AlarmManager regular intervals (such as 5 S and 20 S) to continuously start service (). * (1) if the Service is recycled, onCreate () and onStart () * (2) of the Service will be called. if the Service is not recycled, only the onStart () * of the Service will be called to use this method to implement a curve to prevent the Service from being recycled by the system. ** test environment: * Android: 2.3.6 + ME525 + ** Test method: * 1 deploy the application to the device * 2 restart the device * 3 after the device restarts, click to enter the application. click Button ** 4 on the interface to view the Log ** Note: * 1 4.0 and above, please pay attention to the implementation of the boot broadcast listener * 2 pay attention to permissions *
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 ** Note: * 1 when killing a process, you sometimes need to determine whether the Activity to which the process belongs is displayed on the screen * For details about this method, see getTopActivityNameAndProcessName () * 2 if you have other methods, please leave a message. thank you. **/public class MainActivity extends Activity {private Button mButton; private long lastTime = 0; private Context mContext; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); init ();} private void init () {mContext = this; lastTime = System. currentTimeMillis (); mButton = (Button) findViewById (R. id. button); mButton. setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View view) {if (System. currentTimeMillis ()-lastTime)> 2000) {lastTime = System. currentTimeMillis (); cleanMemory (mContext) ;}}) ;}// simulation service is recycled by the System private void cleanMemory (Context context) {RunningAppProcessInfo runningAppProcessInfo = null; activityManager activityManager = (ActivityManager) context. getSystemService (Context. ACTIVITY_SERVICE); List
 
  
RunningAppProcessInfoList = activityManager. getRunningAppProcesses (); if (runningAppProcessInfoList! = Null) {for (int I = 0; I <runningAppProcessInfoList. size (); ++ I) {runningAppProcessInfo = runningAppProcessInfoList. get (I); String processName = runningAppProcessInfo. processName; if (processName. startsWith ("cc. c ") {System. out. println ("------> kill this application"); int pid = runningAppProcessInfo. pid; Process. killProcess (pid) ;}}// obtain the Activity on the top of the stack and its Process public static String getTopActivityNameAndProcessName (Context context) {String processName = null; String topActivityName = null; activityManager activityManager = (ActivityManager) (context. getSystemService (android. content. context. ACTIVITY_SERVICE); List
  
   
RunningTaskInfos = activityManager. getRunningTasks (1); if (runningTaskInfos! = Null) {ComponentName f = runningTaskInfos. get (0 ). topActivity; String topActivityClassName = f. getClassName (); String temp [] = topActivityClassName. split ("\\. "); // name of the stack top Activity topActivityName = temp [temp. length-1]; int index = topActivityClassName. lastIndexOf (". "); // name of the process to which the stack top Activity belongs: processName = topActivityClassName. substring (0, index); System. out. println ("----> topActivityName =" + topActivityName + ", processName =" + processName);} return topActivityName + "," + processName ;}}
  
 

BootCompletedBroadcastReceiver:

Package cc. c; import android. app. alarmManager; import android. app. pendingIntent; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android. OS. systemClock; // listen to the boot broadcast public class BootCompletedBroadcastReceiver extends BroadcastReceiver {@ Overridepublic void onReceive (Context context, Intent intent) {// receive the boot broadcast if (intent. getAction (). equals (Intent. ACTION_BOOT_COMPLETED) {sendCheckServiceBroadcast (context) ;}// send broadcast private void sendCheckServiceBroadcast (Context context) {Intent intent = new Intent (context, CheckServiceBroadcastReceiver. class); intent. setAction ("com.cn. checkServicebroadcasreceiver "); PendingIntent pendingIntent = PendingIntent. getBroadcast (context, 0, intent, 0); long firstime = SystemClock. elapsedRealtime (); AlarmManager alarmManager = (AlarmManager) context. getSystemService (Context. ALARM_SERVICE); // send the broadcast startServicealarmManager every 20 seconds. setRepeating (AlarmManager. ELAPSED_REALTIME_WAKEUP, firstime, 20*1000, pendingIntent );}}

CheckServiceBroadcastReceiver is as follows:

Package cc. c; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; // check Servicepublic class CheckServiceBroadcastReceiver extends BroadcastReceiver {@ Overridepublic void onReceive (Context context, Intent intent) {if (intent. getAction (). equals ("com.cn. checkServicebroadcasreceiver ") {Intent serviceIntent = new Intent (); serviceIntent. setAction ("cn.com. servicesubclass "); context. startService (serviceIntent );}}}

ServiceSubclass:

Package cc. c; import android. app. service; import android. content. intent; import android. OS. IBinder; // Servicepublic class ServiceSubclass extends Service {@ Overridepublic IBinder onBind (Intent arg0) {return null;} @ Overridepublic void onCreate () {super. onCreate (); System. out. println ("------> service onCreate ()") ;}@ Overridepublic void onStart (Intent intent, int startId) {super. onStart (intent, startId); System. out. println ("------> service onStart ()");}}

Main. xml is as follows:

AndroidManifest. xml is as follows: