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POI want send a username and pass to a url but the program has error
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  1. POI want send a username and pass to a url but the program has error
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    copied!<p>I want connect to a url and send username and passwoerd to url and then i get response of url.I read <a href="http://developer.android.com/reference/java/net/HttpURLConnection.html" rel="nofollow">this</a> document and I use <code>GET</code> method. but when I run the program, the program has stopped. Why?</p> <p>GetFromURL.java:</p> <pre><code>@SuppressLint("NewApi") class GetFromURL extends AsyncTask&lt;String,Void, String&gt; { InputStream is = null; @Override protected String doInBackground(String... urls) { URL url=null; String response=null; String parameters=null; OutputStreamWriter request=null; try { url = new URL("http://www.authentication.com/login.php");//This is not real URL. } catch (MalformedURLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { HttpURLConnection urlConnection=(HttpURLConnection)url.openConnection(); urlConnection.setDoOutput(true); //setRequestProperty(); urlConnection.setRequestMethod("GET"); request=new OutputStreamWriter(urlConnection.getOutputStream()); request.write(parameters); InputStreamReader inStream=new InputStreamReader(urlConnection.getInputStream()); response=convertStreamToString(inStream); inStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return response; } private static String convertStreamToString(InputStreamReader is) { BufferedReader reader = new BufferedReader(is); StringBuilder sb = new StringBuilder(); String line =""; try { while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } } catch (IOException e) { e.printStackTrace(); } finally { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } } </code></pre> <p>MainActivity.java:</p> <pre><code>public class MainActivity extends Activity { String user=null; String pass=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EditText user_id; EditText pass_id; Button button; user_id=(EditText)findViewById(R.id.user_id); pass_id=(EditText)findViewById(R.id.pass); button=(Button)findViewById(R.id.button_click); user=user_id.getText().toString(); pass=pass_id.getText().toString(); button.setOnClickListener(onClickListener); } private OnClickListener onClickListener=new OnClickListener(){ public void onClick(View v){ AsyncTask&lt;String, Void, String&gt; async; String result="test"; async=new GetFromURL().execute("U="+user+"&amp;K="+pass); try { result = async.get(); Log.i("RESULT", result); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ExecutionException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; } </code></pre> <p>Exception:</p> <pre><code>11-28 14:55:48.757: I/catch2(19663): of main 11-28 14:55:48.757: W/System.err(19663): java.util.concurrent.ExecutionException: java.lang.NullPointerException 11-28 14:55:48.757: W/System.err(19663): at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:223) 11-28 14:55:48.765: W/System.err(19663): at java.util.concurrent.FutureTask.get(FutureTask.java:82) 11-28 14:55:48.765: W/System.err(19663): at android.os.AsyncTask.get(AsyncTask.java:462) 11-28 14:55:48.765: W/System.err(19663): at org.example.reward.MainActivity$1.onClick(MainActivity.java:75) 11-28 14:55:48.765: W/System.err(19663): at android.view.View.performClick(View.java:3480) 11-28 14:55:48.765: W/dalvikvm(19663): threadid=11: thread exiting with uncaught exception (group=0x40a4a1f8) 11-28 14:55:48.765: W/System.err(19663): at android.view.View$PerformClick.run(View.java:13983) 11-28 14:55:48.765: W/System.err(19663): at android.os.Handler.handleCallback(Handler.java:605) 11-28 14:55:48.765: W/System.err(19663): at android.os.Handler.dispatchMessage(Handler.java:92) 11-28 14:55:48.765: W/System.err(19663): at android.os.Looper.loop(Looper.java:137) 11-28 14:55:48.765: W/System.err(19663): at android.app.ActivityThread.main(ActivityThread.java:4340) 11-28 14:55:48.765: W/System.err(19663): at java.lang.reflect.Method.invokeNative(Native Method) 11-28 14:55:48.765: W/System.err(19663): at java.lang.reflect.Method.invoke(Method.java:511) 11-28 14:55:48.772: W/System.err(19663): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 11-28 14:55:48.772: W/System.err(19663): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 11-28 14:55:48.772: W/System.err(19663): at dalvik.system.NativeStart.main(Native Method) 11-28 14:55:48.772: W/System.err(19663): Caused by: java.lang.NullPointerException 11-28 14:55:48.772: W/System.err(19663): at java.io.Writer.write(Writer.java:141) 11-28 14:55:48.772: W/System.err(19663): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:59) 11-28 14:55:48.772: W/System.err(19663): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:1) 11-28 14:55:48.772: W/System.err(19663): at android.os.AsyncTask$2.call(AsyncTask.java:264) 11-28 14:55:48.772: W/System.err(19663): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 11-28 14:55:48.772: W/System.err(19663): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 11-28 14:55:48.772: W/System.err(19663): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 11-28 14:55:48.772: W/System.err(19663): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 11-28 14:55:48.772: W/System.err(19663): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 11-28 14:55:48.772: W/System.err(19663): at java.lang.Thread.run(Thread.java:856) 11-28 14:55:48.772: E/AndroidRuntime(19663): FATAL EXCEPTION: AsyncTask #1 11-28 14:55:48.772: E/AndroidRuntime(19663): java.lang.RuntimeException: An error occured while executing doInBackground() 11-28 14:55:48.772: E/AndroidRuntime(19663): at android.os.AsyncTask$3.done(AsyncTask.java:278) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 11-28 14:55:48.772: E/AndroidRuntime(19663): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.lang.Thread.run(Thread.java:856) 11-28 14:55:48.772: E/AndroidRuntime(19663): Caused by: java.lang.NullPointerException 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.io.Writer.write(Writer.java:141) 11-28 14:55:48.772: E/AndroidRuntime(19663): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:59) 11-28 14:55:48.772: E/AndroidRuntime(19663): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:1) 11-28 14:55:48.772: E/AndroidRuntime(19663): at android.os.AsyncTask$2.call(AsyncTask.java:264) 11-28 14:55:48.772: E/AndroidRuntime(19663): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 11-28 14:55:48.772: E/AndroidRuntime(19663): ... 5 more 11-28 14:55:49.265: D/OpenGLRenderer(19663): Flushing caches (mode 0) 11-28 14:55:49.796: D/OpenGLRenderer(19663): Flushing caches (mode 1) 11-28 14:55:50.140: I/Process(19663): Sending signal. PID: 19663 SIG: 9 11-28 15:01:52.538: D/libEGL(19852): loaded /system/lib/egl/libGLES_android.so 11-28 15:01:52.538: D/libEGL(19852): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so 11-28 15:01:52.554: D/libEGL(19852): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so 11-28 15:01:52.561: D/libEGL(19852): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so 11-28 15:01:52.726: D/OpenGLRenderer(19852): Enabling debug mode 0 11-28 15:02:08.827: D/dalvikvm(19852): GC_CONCURRENT freed 157K, 2% free 14304K/14535K, paused 3ms+1ms 11-28 15:02:09.991: I/catch2(19852): of main 11-28 15:02:09.991: W/System.err(19852): java.util.concurrent.ExecutionException: java.lang.NullPointerException 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:223) 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.FutureTask.get(FutureTask.java:82) 11-28 15:02:09.999: W/System.err(19852): at android.os.AsyncTask.get(AsyncTask.java:462) 11-28 15:02:09.999: W/System.err(19852): at org.example.reward.MainActivity$1.onClick(MainActivity.java:75) 11-28 15:02:09.999: W/System.err(19852): at android.view.View.performClick(View.java:3480) 11-28 15:02:09.999: W/System.err(19852): at android.view.View$PerformClick.run(View.java:13983) 11-28 15:02:09.999: W/System.err(19852): at android.os.Handler.handleCallback(Handler.java:605) 11-28 15:02:09.999: W/System.err(19852): at android.os.Handler.dispatchMessage(Handler.java:92) 11-28 15:02:09.999: W/System.err(19852): at android.os.Looper.loop(Looper.java:137) 11-28 15:02:09.999: W/System.err(19852): at android.app.ActivityThread.main(ActivityThread.java:4340) 11-28 15:02:09.999: W/System.err(19852): at java .lang.reflect.Method.invokeNative(Native Method) 11-28 15:02:09.999: W/System.err(19852): at java.lang.reflect.Method.invoke(Method.java:511) 11-28 15:02:09.999: W/System.err(19852): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 11-28 15:02:09.999: W/System.err(19852): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 11-28 15:02:09.999: W/System.err(19852): at dalvik.system.NativeStart.main(Native Method) 11-28 15:02:09.999: W/System.err(19852): Caused by: java.lang.NullPointerException 11-28 15:02:09.999: W/System.err(19852): at java.io.Writer.write(Writer.java:141) 11-28 15:02:09.999: W/System.err(19852): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:59) 11-28 15:02:09.999: W/System.err(19852): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:1) 11-28 15:02:09.999: W/System.err(19852): at android.os.AsyncTask$2.call(AsyncTask.java:264) 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 11-28 15:02:09.999: W/System.err(19852): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 11-28 15:02:09.999: W/System.err(19852): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 11-28 15:02:09.999: W/System.err(19852): at java.lang.Thread.run(Thread.java:856) 11-28 15:02:10.007: W/dalvikvm(19852): threadid=12: thread exiting with uncaught exception (group=0x40a4a1f8) 11-28 15:02:10.015: E/AndroidRuntime(19852): FATAL EXCEPTION: AsyncTask #1 11-28 15:02:10.015: E/AndroidRuntime(19852): java.lang.RuntimeException: An error occured while executing doInBackground() 11-28 15:02:10.015: E/AndroidRuntime(19852): at android.os.AsyncTask$3.done(AsyncTask.java:278) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 11-28 15:02:10.015: E/AndroidRuntime(19852): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.lang.Thread.run(Thread.java:856) 11-28 15:02:10.015: E/AndroidRuntime(19852): Caused by: java.lang.NullPointerException 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.io.Writer.write(Writer.java:141) 11-28 15:02:10.015: E/AndroidRuntime(19852): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:59) 11-28 15:02:10.015: E/AndroidRuntime(19852): at org.example.reward.GetFromURL.doInBackground(GetFromURL.java:1) 11-28 15:02:10.015: E/AndroidRuntime(19852): at android.os.AsyncTask$2.call(AsyncTask.java:264) 11-28 15:02:10.015: E/AndroidRuntime(19852): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 11-28 15:02:10.015: E/AndroidRuntime(19852): ... 5 more 11-28 15:02:10.249: D/OpenGLRenderer(19852): Flushing caches (mode 0) 11-28 15:02:10.788: D/OpenGLRenderer(19852): Flushing caches (mode 1) 11-28 15:02:12.163: I/Process(19852): Sending signal. PID: 19852 SIG: 9 </code></pre> <p>Thanks for help.</p>
 

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