altosdroid: Skip updating hidden UI elements

[fw/altos] / altosdroid / src / org / altusmetrum / AltosDroid / AltosBluetooth.java

diff --git a/altosdroid/src/org/altusmetrum/AltosDroid/AltosBluetooth.java b/altosdroid/src/org/altusmetrum/AltosDroid/AltosBluetooth.java
index a599698faaeb3f37604e23591957e9ab559f675f..484efaf833a6ee4ad2e41ddc13e771d60473e82f 100644 (file)
--- a/altosdroid/src/org/altusmetrum/AltosDroid/AltosBluetooth.java
+++ b/altosdroid/src/org/altusmetrum/AltosDroid/AltosBluetooth.java
@@ -174,18 +174,29 @@ public class AltosBluetooth extends AltosLink {
                } catch (InterruptedException e) {
                        connection_lost();
                }
-       }               
+       }
+
+       private static final int buffer_size = 1024;
+
+       private byte[] buffer = new byte[buffer_size];
+       private int buffer_len = 0;
+       private int buffer_off = 0;
 
        public int getchar() {
-               try {
-                       wait_connected();
-                       return input.read();
-               } catch (IOException e) {
-                       connection_lost();
-               } catch (java.lang.InterruptedException e) {
-                       connection_lost();
+               while (buffer_off == buffer_len) {
+                       try {
+                               wait_connected();
+                               buffer_len = input.read(buffer);
+                               buffer_off = 0;
+                       } catch (IOException e) {
+                               connection_lost();
+                               return AltosLink.ERROR;
+                       } catch (java.lang.InterruptedException e) {
+                               connection_lost();
+                               return AltosLink.ERROR;
+                       }
                }
-               return AltosLink.ERROR;
+               return buffer[buffer_off++];
        }
 
        public void close() {