Google地图在Fragment中使用

因为GoogleMap在官方的Demo的使用是在Actvity中使用，现在想在Fragment中使用方法就是不一样的。

1.首先要添加googleserver的lib。
下面是Google Map的两种实现方式
显示使用Activity的形式呈现Google Map

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
 >
<fragment 
    android:name="com.google.android.gms.maps.MapFragment"
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="#ffffff"
    >
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:layout_marginLeft="11dp"
        android:layout_marginTop="13dp"
        android:textColor="#5e5d5d"
        android:text="@string/site_map_title"
        />
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#5e5d5d"
        android:layout_marginTop="16.67dp"
        android:layout_marginLeft="11dp"
        android:layout_marginBottom="14dp"
         android:textSize="14sp"
        android:text="@string/site_map_wrold"
        />
LinearLayout>
FrameLayout>

上述是布局文件，使用的时候很简单只需要将 android:name=”com.google.android.gms.maps.MapFragment”这句话写到想要呈现的布局文件中就可以了。

public class SiteMapActivity extends Activity implements OnMapReadyCallback {

    private MapFragment mapFragment;
    private GoogleMap mMap;
    private Fragment fragment = null;
    private Bundle args = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_site_map);

        mapFragment = (MapFragment) getFragmentManager().findFragmentById(
                R.id.map);
        mapFragment.getMapAsync(this);

    }

    @Override
    public void onMapReady(GoogleMap map) {
        // TODO Auto-generated method stub
        this.mMap = map;

    }

}

Activity中只需要获取到Map的Fragment就可以了，然后实现GoogleMap的Callback方法
所有的操作就可以在onMapReady中实现了

然后以Fragment的形式呈现GoogleMap

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.google.android.gms.maps.MapView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mapview"
        />
    <LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="#ffffff"
    >
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:layout_marginLeft="11dp"
        android:layout_marginTop="13dp"
        android:textColor="#5e5d5d"
        android:text="@string/site_map_title"
        />
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#5e5d5d"
        android:layout_marginTop="16.67dp"
        android:layout_marginLeft="11dp"
        android:layout_marginBottom="14dp"
         android:textSize="14sp"
        android:text="@string/site_map_wrold"
        />
LinearLayout>
FrameLayout>

在Fragment使用GoogleMap的时候，需要将控件导入到布局文件中，所以要用到GoogleMap的控件。

public class SiteMapFragment extends Fragment {

    private MapView mMap;
    private GoogleMap googleMap;
    private Bundle args = null;
    private ProgressDialog mDialog;
    private String LoginID = null;
    private SharedPreferences preferences;
    private ArrayList mSiteMaps;
    private AlertDialog.Builder builder;
    private static final String LOG_TAG = SiteMapFragment.class.getSimpleName();

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub  
        Log.i("SiteMapFragment", "onCreateView");

        View view = inflater.inflate(R.layout.fragment_to_site_mapview,
                container, false);
        mMap = (MapView) view.findViewById(R.id.mapview);
        mMap.onCreate(savedInstanceState);
        mMap.onResume();// needed to get the map to display immediately

        try {
            MapsInitializer.initialize(getActivity());
        } catch (Exception e) {
            e.printStackTrace();
        }
        int errorCode = GooglePlayServicesUtil
                .isGooglePlayServicesAvailable(this.getActivity());

        if (ConnectionResult.SUCCESS != errorCode) {
            GooglePlayServicesUtil.getErrorDialog(errorCode,
                    this.getActivity(), 0).show();
        } else {
            googleMap = mMap.getMap();
            if (googleMap != null) {
                initVolley();
                LatLng india = new LatLng(23, 77);
                googleMap.setMyLocationEnabled(true);
                googleMap.moveCamera(CameraUpdateFactory
                        .newLatLngZoom(india, 5));
            }
        }

        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);
        Log.i("SiteMapFragment", "onActivityCreated");
    }

    @Override
    public void onResume() {
        super.onResume();
        mMap.onResume();
        Log.i("SiteMapFragment", "onResume");

        // ensure the appbar layout is visible after visiting site pages
        AppBarLayout appBarLayout = ((MainActivity) getActivity())
                .getAppBarLayout();
        appBarLayout.setExpanded(true, true);
    }

    @Override
    public void onDetach() {
        // TODO Auto-generated method stub
        super.onDetach();
        Log.i("SiteMapFragment", "onDetach");
    }

    @Override
    public void onAttach(Context context) {
        // TODO Auto-generated method stub
        super.onAttach(context);
        Log.i("SiteMapFragment", "onAttach");
    }

    @Override
    public void onPause() {
        super.onPause();
        mMap.onPause();
        Log.i("SiteMapFragment", "onPause");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mMap.onDestroy();
        Log.i("SiteMapFragment", "onDestroy");
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mMap.onLowMemory();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        Log.i("SiteMapFragment", "onDestroyView");
    }


}

上述代码中主要的地方不在于如何获取到GoogleMap的控件，而在于因为使用GoogleMap，所以map的生命周期要跟随Fragment进行变化，所以你可以看到在Fragment的某些生命周期的方法中map也只有自己的生命周期。