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PONullPointerException using AsyncTask
 

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    <p>I'm trying to do what should be a simple post to a website and receive a response but I am having problems with implementing <code>AsyncTask</code> to supply the required secondary stream. Currently I am getting a <code>java.lang.NullPointerException</code>. Any ideas what's causing this?</p> <p>Logcat:</p> <pre><code>07-18 11:34:14.829: E/AndroidRuntime(8354): FATAL EXCEPTION: main 07-18 11:34:14.829: E/AndroidRuntime(8354): java.lang.NullPointerException 07-18 11:34:14.829: E/AndroidRuntime(8354): at ca.waddlesoft.smpclient_android.MainActivity$SmpProcessor.onPostExecute(MainActivity.java:50) 07-18 11:34:14.829: E/AndroidRuntime(8354): at ca.waddlesoft.smpclient_android.MainActivity$SmpProcessor.onPostExecute(MainActivity.java:1) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.os.AsyncTask.finish(AsyncTask.java:602) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.os.AsyncTask.access$600(AsyncTask.java:156) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.os.Handler.dispatchMessage(Handler.java:99) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.os.Looper.loop(Looper.java:137) 07-18 11:34:14.829: E/AndroidRuntime(8354): at android.app.ActivityThread.main(ActivityThread.java:4514) 07-18 11:34:14.829: E/AndroidRuntime(8354): at java.lang.reflect.Method.invokeNative(Native Method) 07-18 11:34:14.829: E/AndroidRuntime(8354): at java.lang.reflect.Method.invoke(Method.java:511) 07-18 11:34:14.829: E/AndroidRuntime(8354): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) 07-18 11:34:14.829: E/AndroidRuntime(8354): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) 07-18 11:34:14.829: E/AndroidRuntime(8354): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>My Code:</p> <pre><code>package ca.waddlesoft.smpclient_android; import java.net.MalformedURLException; import java.net.URL; import ca.waddlesoft.smpclient_android.R; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import android.support.v4.app.NavUtils; public class MainActivity extends Activity { private TextView tv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv; tv = (TextView)findViewById(R.id.TextView01); setContentView(R.layout.activity_main); SmpProcessor task = new SmpProcessor(); task.execute(); } private class SmpProcessor extends AsyncTask &lt;Void,Void,String&gt; { @Override protected String doInBackground(Void... voids){ URL url = null; try { url = new URL("http://secure.g4apps.com"); String app="A1"; String data = "E1,E1,AT333AT333,9055627513,2012-02-02 02:02:02,2012-02-02 02:02:02,-454545.343434,434343.232323,A334A334A334A443X,1000000,3434"; byte [] databyte=data.getBytes(); String out = SmpClass.smpCall(url,app,data); // String out = new String(smpresponse); return out; } catch (MalformedURLException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(String result) { tv.setText(result); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } </code></pre>
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