improve performance of displaying log in Main activity

src/org/envaya/sms/App.java

@@ -86,7 +86,7 @@ public final class App extends Application {
     public static final String STATUS_EXTRA_INDEX = "status";
     public static final String STATUS_EXTRA_NUM_PARTS = "num_parts";            
     
-    public static final int MAX_DISPLAYED_LOG = 4000;
+    public static final int MAX_DISPLAYED_LOG = 8000;
     public static final int LOG_TIMESTAMP_INTERVAL = 60000; // ms
     
     public static final int HTTP_CONNECTION_TIMEOUT = 10000; // ms
@@ -437,6 +437,8 @@ public final class App extends Application {
         Log.d(LOG_NAME, msg);
     }
 
+    private int logEpoch = 0;
+    
     public synchronized void log(CharSequence msg) 
     {
         Log.d(LOG_NAME, msg.toString());       
@@ -457,6 +459,7 @@ public final class App extends Application {
             }
 
             displayedLog.replace(0, startPos, "[Older log messages not shown]\n");
+            logEpoch++;
         }
 
         // display a timestamp in the log occasionally        
@@ -473,6 +476,16 @@ public final class App extends Application {
             
         sendBroadcast(new Intent(App.LOG_CHANGED_INTENT));
     }
+
+    /*
+     * Changes whenever we change the beginning of the displayed log.
+     * If it doesn't change, the Main activity can update the log view much
+     * faster by using TextView.append() instead of TextView.setText()
+     */
+    public int getLogEpoch()
+    {
+        return logEpoch;
+    }
     
     public synchronized CharSequence getDisplayedLog()
     {

src/org/envaya/sms/Inbox.java

@@ -79,6 +79,10 @@ public class Inbox {
         {
             incomingQueue.remove(message);
         }        
+        else if (message.getProcessingState() == IncomingMessage.ProcessingState.Forwarding)
+        {
+            numForwardingMessages--;
+        }        
         
         app.log(message.getDescription() + " deleted");
         notifyChanged();

src/org/envaya/sms/Outbox.java

@@ -176,6 +176,11 @@ public class Outbox {
         {
             outgoingQueue.remove(message);
         }
+        else if (message.getProcessingState() == OutgoingMessage.ProcessingState.Sending)
+        {
+            numSendingOutgoingMessages--;
+        }        
+        
         notifyMessageStatus(message, App.STATUS_FAILED, 
                 "deleted by user");
         app.log(message.getDescription() + " deleted");

src/org/envaya/sms/ui/Main.java

@@ -31,6 +31,9 @@ public class Main extends Activity {
         }
     };
     
+    private ScrollView scrollView;
+    private TextView info;
+    
     private class TestTask extends HttpTask
     {
         public TestTask() {
@@ -44,14 +47,32 @@ public class Main extends Activity {
             app.log("Server connection OK!");            
         }
     }
+    
+    private int lastLogEpoch = -1;
 
     public void updateLogView()
-    {           
+    {                   
-        final ScrollView scrollView = (ScrollView) this.findViewById(R.id.info_scroll);
+        int logEpoch = app.getLogEpoch();
-        TextView info = (TextView) this.findViewById(R.id.info);
+        CharSequence displayedLog = app.getDisplayedLog();        
-        
-        info.setText(app.getDisplayedLog());
         
+        if (lastLogEpoch == logEpoch)
+        {
+            int beforeLen = info.getText().length();
+            int afterLen = displayedLog.length();
+            
+            if (beforeLen == afterLen)
+            {                
+                return;
+            }
+            
+            info.append(displayedLog, beforeLen, afterLen);
+        }
+        else
+        {
+            info.setText(displayedLog);
+            lastLogEpoch = logEpoch;
+        }
+                
         scrollView.post(new Runnable() { public void run() { 
             scrollView.fullScroll(View.FOCUS_DOWN);
         } });
@@ -63,11 +84,13 @@ public class Main extends Activity {
         super.onCreate(savedInstanceState);
         
         app = (App) getApplication();
-                
+        
         setContentView(R.layout.main);
         PreferenceManager.setDefaultValues(this, R.xml.prefs, false);               
                         
-        TextView info = (TextView) this.findViewById(R.id.info);        
+        scrollView = (ScrollView) this.findViewById(R.id.info_scroll);
+        info = (TextView) this.findViewById(R.id.info);        
+        
         info.setMovementMethod(new ScrollingMovementMethod());        
         
         updateLogView();

src/org/envaya/sms/ui/PendingMessages.java

@@ -123,6 +123,8 @@ public class PendingMessages extends ListActivity {
         
         displayedMessages = messages;
         
+        this.setTitle("EnvayaSMS : Pending Messages ("+messages.size()+")");
+        
         final LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         final DateFormat longFormat = new SimpleDateFormat("dd MMM hh:mm:ss");
         final DateFormat shortFormat = new SimpleDateFormat("hh:mm:ss");        
@@ -169,6 +171,8 @@ public class PendingMessages extends ListActivity {
         };
         
         setListAdapter(arrayAdapter);                  
+        
+        
     }
     
     public void deleteMessage(QueuedMessage message)