java - Android: Programmatically Turn on WiFi hotspot -

i trying turn on portable wifi hotspot on, referring link:
how set advanced settings of android wifihotspot

this working on samsung galaxy s3 android v4.4.2.(no issues)
on other devices same or lower android version, application crashes , restarts device.

code follows:

package com.android.startwifi; import java.lang.reflect.invocationtargetexception; import java.lang.reflect.method;  import android.app.activity; import android.content.context; import android.net.wifi.wificonfiguration; import android.net.wifi.wifimanager; import android.os.bundle; import android.util.log; import android.view.menu; import android.view.menuitem; import android.widget.toast;   public class main extends activity {  public wifimanager wifimanager; public context context;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     log.i("hi1","hi");     createwifiaccesspoint(); } private void createwifiaccesspoint() {     wifimanager wifimanager = (wifimanager)getbasecontext().getsystemservice(context.wifi_service);     if(wifimanager.iswifienabled())     {         wifimanager.setwifienabled(false);               }            method[] wmmethods = wifimanager.getclass().getdeclaredmethods();       boolean methodfound=false;     for(method method: wmmethods){         if(method.getname().equals("setwifiapenabled")){             methodfound=true;             wificonfiguration netconfig = new wificonfiguration();             netconfig.allowedauthalgorithms.set(wificonfiguration.authalgorithm.open);             netconfig.allowedprotocols.set(wificonfiguration.protocol.rsn);             netconfig.allowedprotocols.set(wificonfiguration.protocol.wpa);             netconfig.allowedkeymanagement.set(wificonfiguration.keymgmt.wpa_psk);             netconfig.allowedpairwiseciphers.set(wificonfiguration.pairwisecipher.ccmp);             netconfig.allowedpairwiseciphers.set(wificonfiguration.pairwisecipher.tkip);             netconfig.allowedgroupciphers.set(wificonfiguration.groupcipher.ccmp);             netconfig.allowedgroupciphers.set(wificonfiguration.groupcipher.tkip);             try {                 boolean apstatus=(boolean) method.invoke(wifimanager, netconfig,true);                           //statusview.settext("creating wi-fi network \""+netconfig.ssid+"\"");                 (method iswifiapenabledmethod: wmmethods)                 {                     if(iswifiapenabledmethod.getname().equals("iswifiapenabled")){                         while(!(boolean)iswifiapenabledmethod.invoke(wifimanager)){                         };                         for(method method1: wmmethods){                             if(method1.getname().equals("getwifiapstate")){                                 int apstate;                                 apstate=(integer)method1.invoke(wifimanager);                                 //                    netconfig=(wificonfiguration)method1.invoke(wifi);                                 //statusview.append("\nssid:"+netconfig.ssid+"\npassword:"+netconfig.presharedkey+"\n");                             }                         }                     }                 }                 if(apstatus)                 {                     system.out.println("successdddd");                       //statusview.append("\naccess point created!");                     //finish();                     //intent searchsensorsintent = new intent(this,searchsensors.class);                                 //startactivity(searchsensorsintent);                 }else                 {                     system.out.println("failed");                        //statusview.append("\naccess point creation failed!");                 }             } catch (illegalargumentexception e) {                 e.printstacktrace();             } catch (illegalaccessexception e) {                 e.printstacktrace();             } catch (invocationtargetexception e) {                 e.printstacktrace();             }         }           }     if(!methodfound){         //statusview.settext("your phone's api not contain setwifiapenabled method configure access point");     } }    @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();     if (id == r.id.action_settings) {         return true;     }     return super.onoptionsitemselected(item); } } 

permissions have defined in manifest file are:

<uses-permission android:name="android.permission.internet"/> <uses-permission android:name="android.permission.access_network_state"/> <uses-permission android:name="android.permission.access_wifi_state"/> <uses-permission android:name="android.permission.change_wifi_state"/> 

log file generated follows:

09-10 18:35:01.644: d/jdwp(29752): prepping jdwp on adb 09-10 18:35:01.644: d/jdwp(29752): adb transport startup 09-10 18:35:01.644: d/dalvikvm(29752): elevating priority 0 -8 09-10 18:35:01.645: d/jdwp(29752): jdwp: thread running 09-10 18:35:01.645: d/jdwp(29752): acceptconnection 09-10 18:35:01.646: d/jdwp(29752): trying receive file descriptor adb 09-10 18:35:01.646: d/dalvikvm(29752): zygote thread init done 09-10 18:35:01.653: d/jdwp(29752): received file descriptor 34 adb 09-10 18:35:01.658: d/jdwp(29752): processincoming 09-10 18:35:01.659: d/jdwp(29752): processincoming 09-10 18:35:01.659: d/jdwp(29752): handlepacket : cmd=0x1, cmdset=0xc7, len=0x13, id=0x40000040, flags=0x0, datalen=0x8 09-10 18:35:01.661: d/jdwp(29752): processincoming 09-10 18:35:01.661: d/jdwp(29752): handlepacket : cmd=0x1, cmdset=0xc7, len=0x17, id=0x40000041, flags=0x0, datalen=0xc 09-10 18:35:01.663: d/jdwp(29752): processincoming 09-10 18:35:01.663: d/jdwp(29752): handlepacket : cmd=0x1, cmdset=0xc7, len=0x13, id=0x40000042, flags=0x0, datalen=0x8 09-10 18:35:01.665: d/jdwp(29752): processincoming 09-10 18:35:01.665: d/jdwp(29752): handlepacket : cmd=0x1, cmdset=0xc7, len=0x13, id=0x40000043, flags=0x0, datalen=0x8 09-10 18:35:01.676: d/jdwp(29752): sendbufferedrequest : len=0x3d 09-10 18:35:01.736: d/jdwp(29752): sendbufferedrequest : len=0x45 09-10 18:35:01.754: w/asset(29752): assetmanager-->adddefaultassets cip path not exsit! 09-10 18:35:02.219: i/hi1(29752): hi 09-10 18:35:02.261: d/wifimanager(29752): enter init, sthreadrefcount:0 09-10 18:35:02.268: d/wifimanager(29752): create wifimanager handlerthread 09-10 18:35:03.599: i/system.out(29752): successdddd 09-10 18:35:03.634: v/phonewindow(29752): decorview setvisiblity: visibility = 4 09-10 18:35:03.745: v/phonewindow(29752): decorview setvisiblity: visibility = 0 09-10 18:35:03.922: d/libegl(29752): loaded /system/lib/egl/libegl_mali.so 09-10 18:35:03.924: d/libegl(29752): loaded /system/lib/egl/libglesv1_cm_mali.so 09-10 18:35:03.927: d/libegl(29752): loaded /system/lib/egl/libglesv2_mali.so 09-10 18:35:04.111: d/openglrenderer(29752): enabling debug mode 0 09-10 18:35:10.610: e/inputeventreceiver(29752): channel '41f21f48 com.android.startwifi/com.android.startwifi.main (client)' ~ publisher closed input channel or error occurred.  events=0x9 

thus have following questions:

• i know why app behaving on samsung s3 not on other devices?
  
• how can fix issue?

wificonfiguration netconfig = new wificonfiguration();  netconfig.ssid = "myap"; netconfig.allowedauthalgorithms.set(wificonfiguration.authalgorithm.open); netconfig.allowedprotocols.set(wificonfiguration.protocol.rsn); netconfig.allowedprotocols.set(wificonfiguration.protocol.wpa); netconfig.allowedkeymanagement.set(wificonfiguration.keymgmt.none);  try {     method setwifiapmethod = wifimanager.getclass().getmethod("setwifiapenabled",  wificonfiguration.class, boolean.class);     boolean apstatus=(boolean) setwifiapmethod.invoke(wifimanager, netconfig,true);      method iswifiapenabledmethod = wifimanager.getclass().getmethod("iswifiapenabled");      while(!(boolean)iswifiapenabledmethod.invoke(wifimanager)){};     method getwifiapstatemethod = wifimanager.getclass().getmethod("getwifiapstate");      int apstate=(integer)getwifiapstatemethod.invoke(wifimanager);     method getwifiapconfigurationmethod = wifimanager.getclass().getmethod("getwifiapconfiguration");     netconfig=(wificonfiguration)getwifiapconfigurationmethod.invoke(wifimanager);     log.e("client", "\nssid:"+netconfig.ssid+"\npassword:"+netconfig.presharedkey+"\n"); } catch (exception e) {     log.e(this.getclass().tostring(), "", e); }