extended configuration (to hande Kitkat issues)

brouter-routing-app/src/main/java/btools/routingapp/AppLogger.java

@@ -0,0 +1,68 @@
+package btools.routingapp;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Date;
+
+import android.os.Environment;
+
+
+/**
+ * static logger interface to be used in the android app
+ */
+public class AppLogger
+{
+    private static FileWriter debugLogWriter = null;
+    private static boolean initDone = false;
+    
+    private static void init()
+    {
+      try
+      {
+        // open logfile if existing
+    	File sd = Environment.getExternalStorageDirectory();
+    	if ( sd == null ) return;
+        File debugLog = new File( sd, "brouterapp.txt" );
+        if ( debugLog.exists() )
+        {
+          debugLogWriter = new FileWriter( debugLog, true );
+        }
+      }
+      catch( IOException ioe ) {}
+    }
+
+    /**
+	 * log an info trace to the app log file, if any
+	 */
+    public static boolean isLogging()
+    {
+    	if ( !initDone )
+    	{
+    	  initDone = true;
+    	  init();
+    	  log( "logging started at " + new Date() );
+    	}
+    	return debugLogWriter != null;
+    }
+
+    /**
+	 * log an info trace to the app log file, if any
+	 */
+    public static void log( String msg )
+    {
+      if ( isLogging() )
+      {
+        try
+        {
+    	  debugLogWriter.write( msg );
+    	  debugLogWriter.write( '\n' );
+    	  debugLogWriter.flush();
+        }
+        catch( IOException e )
+        {
+          throw new RuntimeException( "cannot write appdebug.txt: " + e );
+        }
+      }
+    }
+}