android Map v2中终结器引发的未捕获异常。？如何解决？

我的代码如下：

   I am integrating google map v2 and i got these below errors in logcat, so what happen wrong with code:

private GoogleMap googleMap;
googleMap = ((SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.location_map)).getMap();

    if (googleMap == null) {
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            UiSettings mUiSettings = googleMap.getUiSettings();
            mUiSettings.setMyLocationButtonEnabled(true);

        } 

我的日志如下：

   I am integrating google map v2 and i got these below errors in logcat, so what happen wrong with code:

private GoogleMap googleMap;
googleMap = ((SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.location_map)).getMap();

    if (googleMap == null) {
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            UiSettings mUiSettings = googleMap.getUiSettings();
            mUiSettings.setMyLocationButtonEnabled(true);

        } 

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什么是UiSettings课程？发布它。@SimplePlan，我没有使用UIsetting类，我有上面发布的代码，谢谢