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README.md

android-location-rotation-effect

定位图标箭头指向手机朝向示例

前述

使用方法##

###1:配置搭建AndroidSDK工程###

扫一扫安装##

Screenshot

用到产品

  • Android 3D地图 SDK
  • Android 定位 SDK

核心类/接口##

AMap

  • setLocationSource(LocationSource locationSource) 设置定位资源(V2.0版本起)
  • addMarker(MarkerOptions options) 加一个Marker(标记)到地图上(V2.0版本起)
  • addCircle(CircleOptions options) 添加圆形(circle)覆盖物到地图上(V2.0版本起)

AMapLocationClient

  • startLocation(); 启动定位 (V2.0.0版本起)
  • setLocationOption(mLocationOption); 给定位客户端设置参数 (V2.0.0版本起)

AMapLocationListener

  • onLocationChanged(AMapLocation amapLocation); 监听器回调方法 (V2.0.0版本起)

核心难点##

  • 获取手机sensor角度值并过滤
   @Override
   public void onSensorChanged(SensorEvent event) {
       if (System.currentTimeMillis() - lastTime < TIME_SENSOR) {
           return;
       }
       switch (event.sensor.getType()) {
           case Sensor.TYPE_ORIENTATION: {
               float x = event.values[0];
               x += getScreenRotationOnPhone(mContext);
               x %= 360.0F;
               if (x > 180.0F)
                   x -= 360.0F;
               else if (x < -180.0F)
                   x += 360.0F;

               if (Math.abs(mAngle - x) < 3.0f) {
                   break;
               }
               mAngle = Float.isNaN(x) ? 0 : x;
               if (mMarker != null) {
                   mMarker.setRotateAngle(360 - mAngle);
               }
               lastTime = System.currentTimeMillis();
           }
       }

   }
  • 获取当前手机屏幕旋转角度
    /**
     * 获取当前屏幕旋转角度
     *
     * @param context
     * @return 0表示是竖屏; 90表示是左横屏; 180表示是反向竖屏; 270表示是右横屏
     */
    public static int getScreenRotationOnPhone(Context context) {
        final Display display = ((WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

        switch (display.getRotation()) {
            case Surface.ROTATION_0:
                return 0;

            case Surface.ROTATION_90:
                return 90;

            case Surface.ROTATION_180:
                return 180;

            case Surface.ROTATION_270:
                return -90;
        }
        return 0;
    }
  • 定位回调成功处理Marker与Circle绘制
            if (!mFirstFix) {
                mFirstFix = true;
                addCircle(location, amapLocation.getAccuracy());//添加定位精度圆
                addMarker(location);//添加定位图标
                mSensorHelper.setCurrentMarker(mLocMarker);//定位图标旋转
                aMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location,18));
            } else {
                mCircle.setCenter(location);
                mCircle.setRadius(amapLocation.getAccuracy());
                mLocMarker.setPosition(location);
                aMap.moveCamera(CameraUpdateFactory.changeLatLng(location));
            }

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