From a5430e8730897924ab484b406a70eaf7bc89bd2f Mon Sep 17 00:00:00 2001
From: Leith Bade <leith@mapbox.com>
Date: Thu, 26 Feb 2015 11:16:14 -0800
Subject: [PATCH] Replace setRotation with Matrix

---
 .../mapbox/mapboxgl/testapp/MainActivity.java   | 17 ++++++++++++++---
 .../src/main/res/layout/activity_main.xml       |  4 ++--
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java b/android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java
index 497076041..bd7100d98 100644
--- a/android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java
+++ b/android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java
@@ -1,6 +1,7 @@
 package com.mapbox.mapboxgl.testapp;
 
 import android.content.Context;
+import android.graphics.Matrix;
 import android.graphics.PointF;
 import android.hardware.GeomagneticField;
 import android.hardware.Sensor;
@@ -462,8 +463,18 @@ public class MainActivity extends ActionBarActivity {
         }
     }
 
+    // Rotates an ImageView - does not work if the ImageView has padding, use margins
+    private void rotateImageView(ImageView imageView, float angle) {
+        Matrix matrix = new Matrix();
+        matrix.setScale((float) imageView.getWidth() / (float) imageView.getDrawable().getIntrinsicWidth(), (float) imageView.getHeight() / (float) imageView.getDrawable().getIntrinsicHeight());
+        matrix.postRotate(angle, (float) imageView.getWidth() / 2.0f, (float) imageView.getHeight() / 2.0f);
+        imageView.setImageMatrix(matrix);
+        imageView.setScaleType(ImageView.ScaleType.MATRIX);
+    }
+
+    // Updates the UI to match the current map's position
     private void updateMap() {
-        mCompassView.setRotation((float) mMapFragment.getMap().getDirection());
+        rotateImageView(mCompassView, (float) mMapFragment.getMap().getDirection());
 
         if (mGpsLocation != null) {
             mGpsMarker.setVisibility(View.VISIBLE);
@@ -477,7 +488,7 @@ public class MainActivity extends ActionBarActivity {
                 lp.topMargin = mMapFrameLayout.getHeight() - (int) ((screenLocation.y + 54.0f / 2.0f) * mDensity);
                 mGpsMarker.setLayoutParams(lp);
                 float bearing = mGpsLocation.hasBearing() ? mGpsLocation.getBearing() : mCompassBearing;
-                mGpsMarker.setRotation(bearing);
+                rotateImageView(mGpsMarker, bearing);
                 mGpsMarker.requestLayout();
             } else {
                 mGpsMarker.setImageResource(R.drawable.location_marker);
@@ -485,7 +496,7 @@ public class MainActivity extends ActionBarActivity {
                 lp.leftMargin = (int) ((screenLocation.x - 27.0f / 2.0f) * mDensity);
                 lp.topMargin = mMapFrameLayout.getHeight() - (int) ((screenLocation.y + 27.0f / 2.0f) * mDensity);
                 mGpsMarker.setLayoutParams(lp);
-                mGpsMarker.setRotation(0.0f);
+                rotateImageView(mGpsMarker, 0.0f);
                 mGpsMarker.requestLayout();
             }
         } else {
diff --git a/android/java/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_main.xml b/android/java/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_main.xml
index 7d646222b..6a9bf8266 100644
--- a/android/java/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_main.xml
+++ b/android/java/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_main.xml
@@ -42,7 +42,7 @@
             android:layout_width="48dp"
             android:layout_height="48dp"
             android:layout_gravity="end|top"
-            android:padding="10dp"
+            android:layout_margin="10dp"
             android:contentDescription="@string/compass_desc"
             android:src="@drawable/compass"/>
 
@@ -52,7 +52,7 @@
             android:layout_height="wrap_content"
             android:textAppearance="?android:attr/textAppearanceLarge"
             android:text="@string/label_fps"
-            android:padding="10dp" />
+            android:layout_margin="10dp" />
 
     </FrameLayout>
 </LinearLayout>