سلام
من میخوام یک اپ اندرویدی ایجاد کنم که کاربر بتونه با اون به سرور لاگین کنه و یا ثبت نام کنه و یک سری اطلاعات دریافت کنه سرچ کردم این سایت رو دیدم
http://www.codeproject.com/Articles/...ur-WAMP-server

کدها رو عیننا نوشتم اما برنامه در اجرا بسته میشه
این هم خطاهای لوگ کت

06-21 11:51:35.219: E/json parser(1591): Error parsing dataorg.json.JSONException: End of input at character 0 of
06-21 11:51:35.259: E/AndroidRuntime(1591): FATAL EXCEPTION: AsyncTask #1
06-21 11:51:35.259: E/AndroidRuntime(1591): java.lang.RuntimeException: An error occured while executing doInBackground()
06-21 11:51:35.259: E/AndroidRuntime(1591):     at android.os.AsyncTask$3.done(AsyncTask.java:278)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.lang.Thread.run(Thread.java:856)
06-21 11:51:35.259: E/AndroidRuntime(1591): Caused by: java.lang.NullPointerException
06-21 11:51:35.259: E/AndroidRuntime(1591):     at com.example.senddata.MainActivity$news.doInBackground(MainActivity.java:69)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at com.example.senddata.MainActivity$news.doInBackground(MainActivity.java:1)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
06-21 11:51:35.259: E/AndroidRuntime(1591):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-21 11:51:35.259: E/AndroidRuntime(1591):     ... 5 more
06-21 11:51:35.949: E/WindowManager(1591): Activity com.example.senddata.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@a0697098 that was originally added here
06-21 11:51:35.949: E/WindowManager(1591): android.view.WindowLeaked: Activity com.example.senddata.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@a0697098 that was originally added here
06-21 11:51:35.949: E/WindowManager(1591):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
06-21 11:51:35.949: E/WindowManager(1591):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
06-21 11:51:35.949: E/WindowManager(1591):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
06-21 11:51:35.949: E/WindowManager(1591):     at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
06-21 11:51:35.949: E/WindowManager(1591):     at android.view.Window$LocalWindowManager.addView(Window.java:537)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.Dialog.show(Dialog.java:278)
06-21 11:51:35.949: E/WindowManager(1591):     at com.example.senddata.MainActivity$news.onPreExecute(MainActivity.java:54)
06-21 11:51:35.949: E/WindowManager(1591):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
06-21 11:51:35.949: E/WindowManager(1591):     at android.os.AsyncTask.execute(AsyncTask.java:511)
06-21 11:51:35.949: E/WindowManager(1591):     at com.example.senddata.MainActivity.onCreate(MainActivity.java:43)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.Activity.performCreate(Activity.java:4465)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-21 11:51:35.949: E/WindowManager(1591):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-21 11:51:35.949: E/WindowManager(1591):     at android.os.Looper.loop(Looper.java:137)
06-21 11:51:35.949: E/WindowManager(1591):     at android.app.ActivityThread.main(ActivityThread.java:4424)
06-21 11:51:35.949: E/WindowManager(1591):     at java.lang.reflect.Method.invokeNative(Native Method)
06-21 11:51:35.949: E/WindowManager(1591):     at java.lang.reflect.Method.invoke(Method.java:511)
06-21 11:51:35.949: E/WindowManager(1591):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-21 11:51:35.949: E/WindowManager(1591):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-21 11:51:35.949: E/WindowManager(1591):     at dalvik.system.NativeStart.main(Native Method)

ممنون میشم راهنمایی کنید یا یک نمونه ساده بذارید