android - Delete the application data by setting device administor active -

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i want delete application data , trying activating device administrator active .

  public class appclass extends activity{               ......    case r.id.buttonclear:      if (!mdpm.isadminactive(mdeviceadmin)) {                    intent intent = new intent(devicepolicymanager.action_add_device_admin);                 intent.putextra(devicepolicymanager.extra_device_admin, mdeviceadmin);                 intent.putextra(devicepolicymanager.extra_add_explanation, "process remove user installed applications, settings, wallpaper , sound settings. sure want wipe device?");                 mparentfragment.startactivityforresult(intent, request_code_enable_admin);                 system.out.println("\n in device admin cannot security operations ");             } else {                 // device administrator, can security operations                 system.out.println("\n in device admin can security operations ");                 mdpm.wipedata(0);             }                 .....    public class myadmin extends deviceadminreceiver{      public myadmin() {          // todo auto-generated constructor stub         }      }     }    manifest.xml:    <receiver  android:name="com.app.ui.appclass$myadmin" android:permission="android.permission.bind_device_admin"> <meta-data android:name="android.app.device_admin"      android:resource="@xml/myresxml" /> <intent-filter>     <action android:name="android.app.action.device_admin_enabled"/> </intent-filter>

when click on activate in device administer pop , app crashes following error

newinstance failed: no <init>()   d/androidruntime(10623): shutting down vm   w/dalvikvm(10623): threadid=1: thread exiting uncaught exception (group=0x40a481f8)   e/androidruntime(10623): fatal exception: main   e/androidruntime(10623): java.lang.runtimeexception: unable instantiate receiver   com.app.ui.appclass$myadmin: java.lang.instantiationexception: can't instantiate class com.app.ui.appclass$myadmin; no empty constructor


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