added tracking modes

android/java/MapboxGLAndroidSDK/build.gradle

@@ -33,6 +33,7 @@ dependencies {
     compile 'com.android.support:support-v4:22.2.1'
     compile 'com.squareup.okhttp:okhttp:2.4.0'
     compile 'com.mapzen.android:lost:1.0.1'
+    compile 'com.android.support:design:22.2.1'
 }
 
 android {

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxgl/views/MapView.java

@@ -7,8 +7,11 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
+import android.content.res.ColorStateList;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.PointF;
 import android.hardware.GeomagneticField;
@@ -22,6 +25,8 @@ import android.net.NetworkInfo;
 import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v4.content.res.ResourcesCompat;
 import android.support.v4.view.GestureDetectorCompat;
 import android.support.v4.view.ScaleGestureDetectorCompat;
 import android.text.TextUtils;
@@ -37,6 +42,7 @@ import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.View;
 import android.view.ViewConfiguration;
+import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.ZoomButtonsController;
@@ -58,6 +64,7 @@ import com.mapzen.android.lost.api.LostApiClient;
 import org.apache.commons.validator.routines.UrlValidator;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
 
 // Custom view that shows a Map
@@ -141,6 +148,11 @@ public class MapView extends FrameLayout implements LocationListener {
     private float mCompassBearing;
     private boolean mCompassValid = false;
 
+    // Used for map toggle mode
+    private FloatingActionButton trackingModeButton;
+    private int trackingMode = 0;
+    private long t0 = new Date().getTime();
+
     // Used to manage Event Listeners
     private ArrayList<OnMapChangedListener> mOnMapChangedListener;
 
@@ -293,6 +305,20 @@ public class MapView extends FrameLayout implements LocationListener {
         addView(mCompassView);
         mCompassView.setOnClickListener(new CompassOnClickListener());
 
+        // Setup tracking mode
+        trackingModeButton = new FloatingActionButton(mContext);
+        trackingModeButton.setContentDescription(getResources().getString(R.string.trackingModeButtonContentDescription));
+        trackingModeButton.setBackgroundTintList(ColorStateList.valueOf(getResources().getColor(R.color.background_material_light)));
+        trackingModeButton.setElevation(4);
+        trackingModeButton.setImageBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_my_location_black_24dp));
+        LayoutParams lp2 = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
+        lp2.gravity = Gravity.BOTTOM | Gravity.END;
+        int twentyDp = (int)(20 * mScreenDensity);
+        lp2.setMargins(twentyDp, twentyDp, twentyDp, twentyDp);
+        trackingModeButton.setLayoutParams(lp2);
+        addView(trackingModeButton);
+        trackingModeButton.setOnClickListener(new ToggleModeClickListener());
+
         // Setup Support For Listener Tracking
         // MapView's internal listener is setup in onCreate()
         mOnMapChangedListener = new ArrayList<OnMapChangedListener>();
@@ -890,6 +916,10 @@ public class MapView extends FrameLayout implements LocationListener {
                 return false;
             }
 
+            if (trackingMode != 0) {
+                setTrackingMode(0);
+            }
+
             // Cancel any animation
             mNativeMapView.cancelTransitions(); // TODO need to test canceling
             // transitions with touch
@@ -1578,6 +1608,9 @@ public class MapView extends FrameLayout implements LocationListener {
 
         @Override
         public void onClick(View view) {
+            if(trackingMode == 2){
+                setTrackingMode(0);
+            }
             resetNorth();
         }
     }
@@ -1596,6 +1629,12 @@ public class MapView extends FrameLayout implements LocationListener {
     private void updateLocation(Location location) {
         if (location != null) {
             mGpsLocation = location;
+
+            // Update map position if in follow mode
+            if (trackingMode != 0) {
+                setCenterCoordinate(new LatLng(mGpsLocation));
+            }
+
             updateMap();
         }
     }
@@ -1639,6 +1678,16 @@ public class MapView extends FrameLayout implements LocationListener {
             rotateImageView(mGpsMarker, 0.0f);
             mGpsMarker.requestLayout();
 
+            // Update direction if tracking mode
+            if(trackingMode == 2 && mCompassValid){
+                // TODO need to do proper filtering (see branch filter-compass) or else map will lock up because of all the compass events
+                long t = new Date().getTime();
+                if((t-t0)>1000){
+                    t0 = t;
+                    setDirection(-mCompassBearing, true);
+                }
+            }
+
 /*
             // Used For User Location Bearing UI
             if (mGpsLocation.hasBearing() || mCompassValid) {
@@ -1659,4 +1708,49 @@ public class MapView extends FrameLayout implements LocationListener {
             }
         }
     }
+
+    private class ToggleModeClickListener implements OnClickListener {
+        @Override
+        public void onClick(View v) {
+            setTrackingMode((trackingMode + 1) % 3);
+        }
+    }
+
+    public void setTrackingMode(int trackingMode) {
+
+        this.trackingMode = trackingMode;
+
+        switch (trackingMode) {
+
+            case 0: {
+                trackingModeButton.setImageDrawable(ResourcesCompat.getDrawable(getResources(), R.drawable.ic_my_location_black_24dp, mContext.getTheme()));
+                trackingModeButton.setColorFilter(Color.TRANSPARENT);
+                updateMap();
+            }
+            break;
+
+            case 1: {
+                trackingModeButton.setImageDrawable(ResourcesCompat.getDrawable(getResources(), R.drawable.ic_my_location_black_24dp, mContext.getTheme()));
+                trackingModeButton.setColorFilter(Color.BLUE);
+                if(mGpsLocation != null){
+                    setCenterCoordinate(new LatLng(mGpsLocation));
+                }
+                updateMap();
+            }
+            break;
+
+            case 2: {
+                trackingModeButton.setImageDrawable(ResourcesCompat.getDrawable(getResources(), R.drawable.ic_explore_black_24dp, mContext.getTheme()));
+                trackingModeButton.setColorFilter(Color.BLUE);
+                if(mGpsLocation != null){
+                    setCenterCoordinate(new LatLng(mGpsLocation));
+                }
+                updateMap();
+            }
+            break;
+
+            default:
+                break;
+        }
+    }
 }

android/java/MapboxGLAndroidSDK/src/main/res/values/strings.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="compassContentDescription">Map compass. Click to reset the map rotation to North.</string>
+    <string name="trackingModeButtonContentDescription">Press button to toggle tracking modes (None, Follow, FollowWithHeading)</string>
 </resources>