added an Asyncronous Task to fetch the openCV results every 1 sec and do soemthign with them, in this case it just gets the results, and on post execute in the UI thread, shows teh user what the results are. fixes cesine#16

Author: cesine

android/src/com/androidmontreal/opencv/AndroidOpenCVforHackathonsActivity.java

@@ -15,21 +15,25 @@
  */
 package com.androidmontreal.opencv;
 
-
 import android.app.Activity;
 import android.hardware.Camera;
 import android.hardware.Camera.PictureCallback;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
+import android.os.AsyncTask;
 import android.os.Bundle;
 
 
 public class AndroidOpenCVforHackathonsActivity extends Activity implements PictureCallback
 {
 	private static final String TAG = "OpenCVforHackathons";
 
+	 // OpenCV results view
+    private TextView textView1;
+    private boolean stopUpdatingInBackground = false;
+
 
     /** Called when the activity is first created. */
     @Override
@@ -43,10 +47,41 @@ public void onCreate(Bundle savedInstanceState)
          * function.
          */
         setContentView(R.layout.main);
-        TextView  tv = (TextView) findViewById(R.id.textview1);
-        tv.setText( stringFromJNI() );
+        textView1 = (TextView) findViewById(R.id.textview1);
+        textView1.setText( stringFromJNI() );
 
     }
+    public void getOpenCVResult(View view){
+    	UpdateFromOpenCVTask getOpenCVResults = new UpdateFromOpenCVTask();
+        getOpenCVResults.execute(new String[] { "in execute" });
+    
+    }
+    private class UpdateFromOpenCVTask extends AsyncTask<String, Void, String> {
+		@Override
+		protected String doInBackground(String... urls) {
+			Log.d(TAG,"Pausing 1 sec before calling again.");
+			try {
+				new Thread().sleep(1000);
+			} catch (InterruptedException e) {
+				e.printStackTrace();
+			}
+			if(!(stopUpdatingInBackground)){
+				// Loop every 1 sec
+				getOpenCVResult(textView1);
+			}
+			String response = "Hi from the AsyncThread";
+			response = ((AndroidOpenCVforHackathonsApp) getApplication()).getLastMessage(); 
+			return response;
+		}
+		@Override
+		protected void onPostExecute(String result) {
+			/*
+			 * The result comes from the above doInBackground method, 
+			 * but this runs on the UI thread and so we can set a field in the UI.
+			 */
+			textView1.setText(result);
+		}
+	}
 
     @Override
 	protected void onDestroy() {
@@ -63,13 +98,16 @@ public void onLowMemory() {
 	@Override
 	protected void onPause() {
 		Log.d(TAG, "====onPause====");
-		super.onPause();
+		stopUpdatingInBackground = true;
+	    super.onPause();
 	}
 
 	@Override
 	protected void onResume() {
 		Log.d(TAG, "==onResume==");
 		super.onResume();
+		stopUpdatingInBackground = false;
+        getOpenCVResult(textView1);
 	}
 
 	@Override