问无法解析symbol .getMapAsync

EN

    mMapFragment = (MapFragment) getFragmentManager().findFragmentById(
            R.id.mapFragment);

    // Call .getMapAsync() and pass it an object that implements
    // the OnMapReadyCallback interface.


    mMapFragment.getMapAsync(new OnMapReadyCallback() {
        @Override
        public void onMapReady(AmazonMap amazonMap) {
            // This method is called when the map is ready. The AmazonMap
            // object provided to this method will never be null.

            // Use the map reference to set UI settings and other options.
            amazonMap.getUiSettings().setZoomControlsEnabled(true);
            amazonMap.setTrafficEnabled(true);
        }
    });

allprojects {
    repositories {
       jcenter()
       mavenLocal()
    }
}

dependencies {
    ...other unrelated dependencies
    compile ('com.amazon.android:amazon-maps-api:2.0')
}