Android example source code file (ViewMap.java)

This example Android source code file (ViewMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, arraylist, drawable, drawing, framelayout, geopoint, graphics, mapactivity, maps, mapview, mapviewcompassdemo_dummyapikey, mylocationoverlay, override, paint, panoramioitem, panoramiooverlay, point, runnable, ui, view

The ViewMap.java Android example source code

/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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 com.google.android.panoramio;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;

import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.FrameLayout;

import java.util.ArrayList;
import java.util.List;


/**
 * Displays a custom map which shows our current location and the location
 * where the photo was taken.
 */
public class ViewMap extends MapActivity {
    private MapView mMapView;

    private MyLocationOverlay mMyLocationOverlay;

    ArrayList<PanoramioItem> mItems = null;

    private PanoramioItem mItem;

    private Drawable mMarker;

    private int mMarkerXOffset;

    private int mMarkerYOffset;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        FrameLayout frame = new FrameLayout(this);
        mMapView = new MapView(this, "MapViewCompassDemo_DummyAPIKey");
        frame.addView(mMapView, 
                new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        setContentView(frame);

        mMyLocationOverlay = new MyLocationOverlay(this, mMapView);

        mMarker = getResources().getDrawable(R.drawable.map_pin);
        
        // Make sure to give mMarker bounds so it will draw in the overlay
        final int intrinsicWidth = mMarker.getIntrinsicWidth();
        final int intrinsicHeight = mMarker.getIntrinsicHeight();
        mMarker.setBounds(0, 0, intrinsicWidth, intrinsicHeight);
        
        mMarkerXOffset = -(intrinsicWidth / 2);
        mMarkerYOffset = -intrinsicHeight;
        
        // Read the item we are displaying from the intent, along with the 
        // parameters used to set up the map
        Intent i = getIntent();
        mItem = i.getParcelableExtra(ImageManager.PANORAMIO_ITEM_EXTRA);
        int mapZoom = i.getIntExtra(ImageManager.ZOOM_EXTRA, Integer.MIN_VALUE);
        int mapLatitudeE6 = i.getIntExtra(ImageManager.LATITUDE_E6_EXTRA, Integer.MIN_VALUE);
        int mapLongitudeE6 = i.getIntExtra(ImageManager.LONGITUDE_E6_EXTRA, Integer.MIN_VALUE);
        
        final List<Overlay> overlays = mMapView.getOverlays();
        overlays.add(mMyLocationOverlay);
        overlays.add(new PanoramioOverlay());
        
        final MapController controller = mMapView.getController();
        if (mapZoom != Integer.MIN_VALUE && mapLatitudeE6 != Integer.MIN_VALUE
                && mapLongitudeE6 != Integer.MIN_VALUE) {
            controller.setZoom(mapZoom);
            controller.setCenter(new GeoPoint(mapLatitudeE6, mapLongitudeE6));
        } else {
            controller.setZoom(15);
            mMyLocationOverlay.runOnFirstFix(new Runnable() {
                public void run() {
                    controller.animateTo(mMyLocationOverlay.getMyLocation());
                }
            });
        }

        mMapView.setClickable(true);
        mMapView.setEnabled(true);
        mMapView.setSatellite(true);
        addZoomControls(frame);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mMyLocationOverlay.enableMyLocation();
    }

    @Override
    protected void onStop() {
        mMyLocationOverlay.disableMyLocation();
        super.onStop();
    }

    /**
     * Get the zoom controls and add them to the bottom of the map
     */
    private void addZoomControls(FrameLayout frame) {
        View zoomControls = mMapView.getZoomControls();

        FrameLayout.LayoutParams p = 
            new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT, Gravity.BOTTOM + Gravity.CENTER_HORIZONTAL);
        frame.addView(zoomControls, p);
    }
    
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
    
    /**
     * Custom overlay to display the Panoramio pushpin
     */
    public class PanoramioOverlay extends Overlay {
        @Override
        public void draw(Canvas canvas, MapView mapView, boolean shadow) {
            if (!shadow) {
                Point point = new Point();
                Projection p = mapView.getProjection();
                p.toPixels(mItem.getLocation(), point);
                super.draw(canvas, mapView, shadow);
                drawAt(canvas, mMarker, point.x + mMarkerXOffset, point.y + mMarkerYOffset, shadow);
            }
        }
    }
    
}