android: Make log view more efficient

This bunches several log messages together before posting Runnables.

Fixes #2148.

diff --git a/src/frontends/android/app/src/main/java/org/strongswan/android/ui/LogFragment.java b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/LogFragment.java
index 2f62407..f68d0c6 100644 (file)
--- a/src/frontends/android/app/src/main/java/org/strongswan/android/ui/LogFragment.java
+++ b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/LogFragment.java
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
- * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2012-2017 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -32,6 +32,7 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.StringReader;
+import java.util.ArrayList;
 
 public class LogFragment extends Fragment implements Runnable
 {
@@ -121,16 +122,20 @@ public class LogFragment extends Fragment implements Runnable
         * Write the given log line to the TextView. We strip the prefix off to save
         * some space (it is not that helpful for regular users anyway).
         *
-        * @param line log line to log
+        * @param lines log lines to log
         */
-       public void logLine(final String line)
+       public void logLines(final ArrayList<String> lines)
        {
                mLogHandler.post(new Runnable() {
                        @Override
                        public void run()
                        {
-                               /* strip off prefix (month=3, day=2, time=8, thread=2, spaces=3) */
-                               mLogView.append((line.length() > 18 ? line.substring(18) : line) + '\n');
+                               mLogView.beginBatchEdit();
+                               for (String line : lines)
+                               {       /* strip off prefix (month=3, day=2, time=8, thread=2, spaces=3) */
+                                       mLogView.append((line.length() > 18 ? line.substring(18) : line) + '\n');
+                               }
+                               mLogView.endBatchEdit();
                                /* calling autoScroll() directly does not work, probably because content
                                 * is not yet updated, so we post this to be done later */
                                mScrollView.post(new Runnable() {
@@ -147,18 +152,30 @@ public class LogFragment extends Fragment implements Runnable
        @Override
        public void run()
        {
+               ArrayList<String> lines = null;
+
                while (mRunning)
                {
                        try
                        {       /* this works as long as the file is not truncated */
                                String line = mReader.readLine();
                                if (line == null)
-                               {       /* wait until there is more to log */
+                               {
+                                       if (lines != null)
+                                       {
+                                               logLines(lines);
+                                               lines = null;
+                                       }
+                                       /* wait until there is more to log */
                                        Thread.sleep(1000);
                                }
                                else
                                {
-                                       logLine(line);
+                                       if (lines == null)
+                                       {
+                                               lines = new ArrayList<>();
+                                       }
+                                       lines.add(line);
                                }
                        }
                        catch (Exception e)
@@ -166,6 +183,10 @@ public class LogFragment extends Fragment implements Runnable
                                break;
                        }
                }
+               if (lines != null)
+               {
+                       logLines(lines);
+               }
        }
 
        /**