add daily results and tests, make async tasks parallel and endless

move color interpolate functions from async task to main class

app/src/test/java/de/weseng/wifiweatherstation/MainNativeActivityTest.java

@@ -0,0 +1,33 @@
+package de.weseng.wifiweatherstation;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class MainNativeActivityTest {
+
+    @Test
+    public void valueToColorRGB_below() {
+        assertEquals(new MainNativeActivity().valueToColorRGB(
+                10, 17, 19, 23, 25,
+                0x719dc3, 0xff00ff00, 0xffd1655d),
+                0x719dc3);
+    }
+
+    @Test
+    public void valueToColorRGB_ideal() {
+        assertEquals(new MainNativeActivity().valueToColorRGB(
+                20, 17, 19, 23, 25,
+                0x719DC3, 0xff00ff00, 0xffd1655d),
+                0xff00ff00);
+    }
+
+    @Test
+    public void valueToColorRGB_above() {
+        assertEquals(new MainNativeActivity().valueToColorRGB(
+                30, 17, 19, 23, 25,
+                0x719DC3, 0xff00ff00, 0xffd1655d),
+                0xffd1655d);
+    }
+
+}