android.support.v4.app.MapFragment.java Source code

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Here is the source code for android.support.v4.app.MapFragment.java

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/*
 * Copyright (C) 2012 Massimiliano Leone - massimiliano.leone@iubris.net
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.support.v4.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

import com.google.android.maps.MapView;

public abstract class MapFragment extends Fragment {

    private View mapViewContainer;

    /**
     * here we instance the viewcontainer returned by onViewCreated,
     * inflating from layout provided by (your concrete) providesMapViewContainerId method;
     * something as:
     * 
     * <pre> return LayoutInflater.from(activity).inflate(R.layout.yourmaplayout, null);</pre> <br/>
     */
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        if (mapViewContainer == null) {
            mapViewContainer = LayoutInflater.from(activity).inflate(providesMapViewContainerId(), null);
        }
    }

    /**
     * something as: <br/>
     * in your concrete class you have to provide the layout containing mapview:
     * <pre> return R.layout.map;</pre> <br/>
     * where R.layout.map is map.xml file in layout directory, declaring a RelativeLayout,
     * which contains Mapview, as below:<br/>
     * <pre>
    &ltRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/maplayout"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"&gt
         
     &ltcom.google.android.maps.MapView
       android:id="@+id/mapview"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:clickable="true"
       android:apiKey="YOUR_APIKEY"/&gt
    &lt/RelativeLayout&gt
     *</pre>
     * 
     * @param activity
     * @return View
     */
    protected abstract int providesMapViewContainerId();

    protected void addMapViewToViewParent(View view, MapView mapView) {

        ViewGroup viewGroup = (ViewGroup) view.getParent();

        if (viewGroup == null)
            viewGroup = (ViewGroup) view;

        int childs = viewGroup.getChildCount();
        if (childs == 0) {
            viewGroup.addView(mapView);
        } else {
            for (int i = 0; i < viewGroup.getChildCount(); i++) {
                View child = viewGroup.getChildAt(i);
                if (child instanceof FrameLayout) {
                    continue;
                } else if (child instanceof MapView) {
                    viewGroup.removeView(child);
                    viewGroup.addView(mapView, 1);
                } else {
                    viewGroup.removeView(child);
                }
            }
            //viewGroup.addView(mapView, 0);
        }
        viewGroup.invalidate();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return mapViewContainer;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        ViewGroup parentViewGroup = (ViewGroup) mapViewContainer.getParent();
        if (parentViewGroup != null) {
            parentViewGroup.removeView(mapViewContainer);
            //parentViewGroup.removeAllViews();
        }
    }
}