title: This application may be doing too much work in its main thread
body: <p>i am using the following piece of code to add an item to mysql database.When the button is clicked,it should begin the Async task that uploads data to the server.But when i run it i get the error message "This application may be doing too much work in its main thread" from LogCat.How can i fix this code problem,thanks.</p>
  
  <pre><code>public class NewProductActivity extends Activity {
  
  // Progress Dialog
  private ProgressDialog pDialog;
  
  JSONParser jsonParser = new JSONParser();
  EditText inputName;
  EditText inputPrice;
  EditText inputDesc;
  
  // url to create new product
  private static String url_create_product = "http://localhost/android_connect/create_product.php";
  
  // JSON Node names
  private static final String TAG_SUCCESS = "success";
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.add_product);
  
      // Edit Text
      inputName = (EditText) findViewById(R.id.inputName);
      inputPrice = (EditText) findViewById(R.id.inputPrice);
      inputDesc = (EditText) findViewById(R.id.inputDesc);
  
      // Create button
      Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);
  
      // button click event
      btnCreateProduct.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View view) {
              // creating new product in background thread
  
              new CreateNewProduct().execute();
  
          }
      });
  }
  
  /**
   * Background Async Task to Create new product
   * */
  class CreateNewProduct extends AsyncTask&lt;String, String, String&gt; {
  
      /**
       * Before starting background thread Show Progress Dialog
       * */
      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          pDialog = new ProgressDialog(NewProductActivity.this);
          pDialog.setMessage("Creating Product..");
          pDialog.setIndeterminate(false);
          pDialog.setCancelable(true);
          pDialog.show();
      }
  
      /**
       * Creating product
       * */
      protected String doInBackground(String... args) {
          String name = inputName.getText().toString();
          String price = inputPrice.getText().toString();
          String description = inputDesc.getText().toString();
  
          // Building Parameters
          List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;();
          params.add(new BasicNameValuePair("name", name));
          params.add(new BasicNameValuePair("price", price));
          params.add(new BasicNameValuePair("description", description));
  
          // getting JSON Object
          // Note that create product url accepts POST method
          JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                  "POST", params);
  
          // check log cat fro response
          Log.d("Create Response", json.toString());
  
          // check for success tag
          try {
              int success = json.getInt(TAG_SUCCESS);
  
              if (success == 1) {
                  // successfully created product
                  Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
                  startActivity(i);
  
                  // closing this screen
                  finish();
              } else {
                  // failed to create product
              }
          } catch (JSONException e) {
              e.printStackTrace();
          }
  
          return null;
      }
  </code></pre>
  
  <p>this is the LogCat output:</p>
  
  <pre><code>05-08 12:51:26.761: I/Choreographer(762): Skipped 31 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:28.632: W/System.err(762): org.apache.http.conn.HttpHostConnectException: "Connection to localhost refused
  05-08 12:51:28.672: W/System.err(762):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
  05-08 12:51:28.672: W/System.err(762):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
  05-08 12:51:28.712: W/System.err(762):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
  05-08 12:51:28.712: W/System.err(762):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
  05-08 12:51:28.832: W/System.err(762):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
  05-08 12:51:28.902: W/System.err(762):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
  05-08 12:51:29.012: W/System.err(762):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
  05-08 12:51:29.072: W/System.err(762):  at com.example.androidhive.JSONParser.makeHttpRequest(JSONParser.java:51)
  05-08 12:51:29.072: W/System.err(762):  at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:97)
  05-08 12:51:29.172: W/System.err(762):  at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:1)
  05-08 12:51:29.252: W/System.err(762):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
  05-08 12:51:29.312: W/System.err(762):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
  05-08 12:51:29.322: W/System.err(762):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
  05-08 12:51:29.342: W/System.err(762):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
  05-08 12:51:29.342: W/System.err(762):  at java.lang.Thread.run(Thread.java:856)
  05-08 12:51:29.372: W/System.err(762): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 80): connect failed: ECONNREFUSED (Connection refused)
  05-08 12:51:29.442: W/System.err(762):  at libcore.io.IoBridge.connect(IoBridge.java:114)
  05-08 12:51:29.493: W/System.err(762):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
  05-08 12:51:29.552: W/System.err(762):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
  05-08 12:51:29.552: W/System.err(762):  at java.net.Socket.connect(Socket.java:842)
  05-08 12:51:29.572: W/System.err(762):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
  05-08 12:51:29.652: W/System.err(762):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
  05-08 12:51:29.692: W/System.err(762):  ... 14 more
  05-08 12:51:29.763: W/System.err(762): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
  05-08 12:51:29.872: W/System.err(762):  at libcore.io.Posix.connect(Native Method)
  05-08 12:51:29.872: W/System.err(762):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
  05-08 12:51:29.892: W/System.err(762):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
  05-08 12:51:29.992: W/System.err(762):  at libcore.io.IoBridge.connect(IoBridge.java:112)
  05-08 12:51:29.992: W/System.err(762):  ... 19 more
  05-08 12:51:30.102: E/Buffer Error(762): Error converting result java.lang.NullPointerException: lock == null
  05-08 12:51:30.212: E/JSON Parser(762): Error parsing data org.json.JSONException: End of input at character 0 of 
  05-08 12:51:30.302: W/dalvikvm(762): threadid=14: thread exiting with uncaught exception (group=0x40a71930)
  05-08 12:51:30.602: E/AndroidRuntime(762): FATAL EXCEPTION: AsyncTask #4
  05-08 12:51:30.602: E/AndroidRuntime(762): java.lang.RuntimeException: An error occured while executing doInBackground()
  05-08 12:51:30.602: E/AndroidRuntime(762):  at android.os.AsyncTask$3.done(AsyncTask.java:299)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.FutureTask.run(FutureTask.java:239)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.lang.Thread.run(Thread.java:856)
  05-08 12:51:30.602: E/AndroidRuntime(762): Caused by: java.lang.NullPointerException
  05-08 12:51:30.602: E/AndroidRuntime(762):  at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:101)    
  05-08 12:51:30.602: E/AndroidRuntime(762):  at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:1)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
  05-08 12:51:30.602: E/AndroidRuntime(762):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
  05-08 12:51:30.602: E/AndroidRuntime(762):  ... 3 more
  05-08 12:51:32.542: I/Choreographer(762): Skipped 395 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:32.752: I/Choreographer(762): Skipped 54 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:33.892: I/Choreographer(762): Skipped 295 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:34.132: I/Choreographer(762): Skipped 58 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:35.762: E/WindowManager(762): Activity com.example.androidhive.NewProductActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d3d5e0 V.E..... R.....ID 0,0-329,175} that was originally added here
  05-08 12:51:35.762: E/WindowManager(762): android.view.WindowLeaked: Activity com.example.androidhive.NewProductActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d3d5e0 V.E..... R.....ID 0,0-329,175} that was originally added here
  05-08 12:51:35.762: E/WindowManager(762):   at android.view.ViewRootImpl.&lt;init&gt;(ViewRootImpl.java:354)
  05-08 12:51:35.762: E/WindowManager(762):   at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
  05-08 12:51:35.762: E/WindowManager(762):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
  05-08 12:51:35.762: E/WindowManager(762):   at android.app.Dialog.show(Dialog.java:281)
  05-08 12:51:35.762: E/WindowManager(762):   at com.example.androidhive.NewProductActivity$CreateNewProduct.onPreExecute(NewProductActivity.java:78)
  05-08 12:51:35.762: E/WindowManager(762):   at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
  05-08 12:51:35.762: E/WindowManager(762):   at android.os.AsyncTask.execute(AsyncTask.java:534)
  05-08 12:51:35.762: E/WindowManager(762):   at com.example.androidhive.NewProductActivity$1.onClick(NewProductActivity.java:57)
  05-08 12:51:35.762: E/WindowManager(762):   at android.view.View.performClick(View.java:4204)
  05-08 12:51:35.762: E/WindowManager(762):   at android.view.View$PerformClick.run(View.java:17355)
  05-08 12:51:35.762: E/WindowManager(762):   at android.os.Handler.handleCallback(Handler.java:725)
  05-08 12:51:35.762: E/WindowManager(762):   at android.os.Handler.dispatchMessage(Handler.java:92)
  05-08 12:51:35.762: E/WindowManager(762):   at android.os.Looper.loop(Looper.java:137)
  05-08 12:51:35.762: E/WindowManager(762):   at android.app.ActivityThread.main(ActivityThread.java:5041)
  05-08 12:51:35.762: E/WindowManager(762):   at java.lang.reflect.Method.invokeNative(Native Method)
  05-08 12:51:35.762: E/WindowManager(762):   at java.lang.reflect.Method.invoke(Method.java:511)
  05-08 12:51:35.762: E/WindowManager(762):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  05-08 12:51:35.762: E/WindowManager(762):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  05-08 12:51:35.762: E/WindowManager(762):   at dalvik.system.NativeStart.main(Native Method)
  05-08 12:51:35.812: I/Choreographer(762): Skipped 172 frames!  The application may be doing too much work on its main thread.
  05-08 12:51:36.172: I/Process(762): Sending signal. PID: 762 SIG: 9
  </code></pre>