我在 android 中开发了一个应用程序，它使用谷歌地图来显示用户位置附近的购物中心列表。
这是我实现它的代码。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<org.fluturasymphony.recommendation.StoreMapView
android:id="@+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:enabled="true"
android:clickable="true"
android:apiKey="0aHtkSh4B8Ub3ELLFUMRWJD23wpEWJAsFxL-ilw"
/>
</RelativeLayout>
商店地图活动的代码。
public class StoreMapActivity extends MapActivity {
List<GeoPoint> items = new ArrayList<GeoPoint>();
StoreMapView mapView;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
SharedPreferences myPrefs = this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
String outlet_details = myPrefs.getString("outlet_details", "null");
String show_all = myPrefs.getString("show_all","null");
this.mapView = init();
//MapController mc = mapView.getController();
@SuppressWarnings("unused")
GeoPoint p = new GeoPoint(0,0);
// String all_data = "[{\"outlet_latlng\":\"12.928569,77.58311\",\"outlet_id\":\"1\",\"outlet_desc\":\"BigBazaar\",\"outlet_loc\":\"Jayanagar4thBlock\",\"outlet_image\":\"bigbazaar.png\",\"recommended_products\":[{\"item_id\":\"3\",\"item_desc\":\"dettol\",\"item_image\":\"dettol.png\"}]},{\"outlet_latlng\":\"12.939235,77.578068\",\"outlet_id\":\"2\",\"outlet_desc\":\"FoodWorld\",\"outlet_loc\":\"Basavanagudi\",\"outlet_image\":\"foodworld.png\",\"recommended_products\":[{\"item_id\":\"3\",\"item_desc\":\"dettol\",\"item_image\":\"dettol.png\"},{\"item_id\":\"3\",\"item_desc\":\"colgate\",\"item_image\":\"colgate.png\"}]},{\"outlet_latlng\":\"12.958934,77.657161\",\"outlet_id\":\"5\",\"outlet_desc\":\"Total\",\"outlet_loc\":\"MurgeshPalaya\",\"outlet_image\":\"total.png\",\"recommended_products\":[{\"item_id\":\"3\",\"item_desc\":\"dettol\",\"item_image\":\"dettol.png\"},{\"item_id\":\"3\",\"item_desc\":\"colgate\",\"item_image\":\"colgate.png\"}]}]"; // temp data
myPrefs = StoreMapActivity.this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
String client = myPrefs.getString("client", "godrej");
String url = "http://10.0.2.2/Flutura/PHP/Core/Data/android.data.php?request=outlets";
Log.v("url",url);
AsyncHttpClient httpclient = new AsyncHttpClient();
httpclient.get(url, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(String response) {
try {
Log.v("response",response);
updateMap(response);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
protected void updateMap(String json) throws JSONException{
Log.v("json",json);
ArrayList<String> outlets = Utils.ToArrayList(new JSONArray(json));
Iterator<String> i = outlets.iterator();
while(i.hasNext()){
String j = i.next();
displayOutlet(this.mapView,new JSONObject(j));
}
this.setMapBoundsToPois(this.mapView, items, 0.1, 0.2);
mapView.invalidate();
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;// Minimum & maximum latitude so we can span it
}
protected StoreMapView init(){
// Initialize Map Object
StoreMapView mapView = (StoreMapView) findViewById(R.id.mapView);
// Add zoom controls
mapView.setBuiltInZoomControls(true);
// Add listener
mapView.setOnChangeListener(new MapViewChangeListener());
return mapView;
}
protected GeoPoint displayOutlet(StoreMapView mapView,JSONObject outlet) throws JSONException{
String coordinates[] =outlet.getString("outlet_latlng").split(",");
double lat = Double.parseDouble(coordinates[0]);
double lng = Double.parseDouble(coordinates[1]);
GeoPoint p = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
this.items.add(p);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
StoreOverlay itemizedoverlay = new StoreOverlay(drawable, this);
ArrayList<String> recomm_products = Utils.ToArrayList(new JSONArray(outlet.getString("recommended_products")));
Iterator<String> i = recomm_products.iterator();
String recommended_products = "";
int index = 0;
while (i.hasNext()) {
index++;
String j = i.next();
JSONObject item = new JSONObject(j);
Log.v("j",j);
itemizedoverlay.addItem(item.getString("item_name"));
}
OverlayItem overlayitem = new OverlayItem(p, outlet.getString("outlet_desc"), "Recommended Products");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
return p;
}
private class MapViewChangeListener implements StoreMapView.OnChangeListener
{
@Override
public void onChange(MapView view, GeoPoint newCenter, GeoPoint oldCenter, int newZoom, int oldZoom)
{
// Check values
if ((!newCenter.equals(oldCenter)) && (newZoom != oldZoom))
{
// Map Zoom and Pan Detected
// TODO: Add special action here
}
else if (!newCenter.equals(oldCenter))
{
// Map Pan Detected
// TODO: Add special action here
}
else if (newZoom != oldZoom)
{
// Map Zoom Detected
// TODO: Add special action here
}
}
}
public void setMapBoundsToPois(StoreMapView mapView,List<GeoPoint> items, double hpadding, double vpadding) {
MapController mapController = mapView.getController();
// If there is only on one result
// directly animate to that location
if (items.size() == 1) { // animate to the location
mapController.animateTo(items.get(0));
} else {
// find the lat, lon span
int minLatitude = Integer.MAX_VALUE;
int maxLatitude = Integer.MIN_VALUE;
int minLongitude = Integer.MAX_VALUE;
int maxLongitude = Integer.MIN_VALUE;
// Find the boundaries of the item set
for (GeoPoint item : items) {
int lat = item.getLatitudeE6(); int lon = item.getLongitudeE6();
maxLatitude = Math.max(lat, maxLatitude);
minLatitude = Math.min(lat, minLatitude);
maxLongitude = Math.max(lon, maxLongitude);
minLongitude = Math.min(lon, minLongitude);
}
// leave some padding from corners
// such as 0.1 for hpadding and 0.2 for vpadding
maxLatitude = maxLatitude + (int)((maxLatitude-minLatitude)*hpadding);
minLatitude = minLatitude - (int)((maxLatitude-minLatitude)*hpadding);
maxLongitude = maxLongitude + (int)((maxLongitude-minLongitude)*vpadding);
minLongitude = minLongitude - (int)((maxLongitude-minLongitude)*vpadding);
// Calculate the lat, lon spans from the given pois and zoom
mapController.zoomToSpan(Math.abs(maxLatitude - minLatitude), Math
.abs(maxLongitude - minLongitude));
// Animate to the center of the cluster of points
mapController.animateTo(new GeoPoint(
(maxLatitude + minLatitude) / 2, (maxLongitude + minLongitude) / 2));
}
} // end of the method
}
商店地图视图的代码。
public class StoreMapView extends MapView
{
// ------------------------------------------------------------------------
// LISTENER DEFINITIONS
// ------------------------------------------------------------------------
// Change listener
public interface OnChangeListener
{
public void onChange(MapView view, GeoPoint newCenter, GeoPoint oldCenter, int newZoom, int oldZoom);
}
// ------------------------------------------------------------------------
// MEMBERS
// ------------------------------------------------------------------------
private StoreMapView mThis;
private long mEventsTimeout = 250L; // Set this variable to your preferred timeout
private boolean mIsTouched = false;
private GeoPoint mLastCenterPosition;
private int mLastZoomLevel;
//private Timer mChangeDelayTimer = new Timer();
private StoreMapView.OnChangeListener mChangeListener = null;
// ------------------------------------------------------------------------
// RUNNABLES
// ------------------------------------------------------------------------
private Runnable mOnChangeTask = new Runnable()
{
@Override
public void run()
{
if (mChangeListener != null) mChangeListener.onChange(mThis, getMapCenter(), mLastCenterPosition, getZoomLevel(), mLastZoomLevel);
mLastCenterPosition = getMapCenter();
mLastZoomLevel = getZoomLevel();
}
};
// ------------------------------------------------------------------------
// CONSTRUCTORS
// ------------------------------------------------------------------------
public StoreMapView(Context context, String apiKey)
{
super(context, apiKey);
init();
}
public StoreMapView(Context context, AttributeSet attrs)
{
super(context, attrs);
init();
}
public StoreMapView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
init();
}
private void init()
{
mThis = this;
mLastCenterPosition = this.getMapCenter();
mLastZoomLevel = this.getZoomLevel();
}
// ------------------------------------------------------------------------
// GETTERS / SETTERS
// ------------------------------------------------------------------------
public void setOnChangeListener(StoreMapView.OnChangeListener l)
{
mChangeListener = l;
}
// ------------------------------------------------------------------------
// EVENT HANDLERS
// ------------------------------------------------------------------------
@Override
public boolean onTouchEvent(MotionEvent ev)
{
// Set touch internal
mIsTouched = (ev.getAction() != MotionEvent.ACTION_UP);
return super.onTouchEvent(ev);
}
@Override
public void computeScroll()
{
super.computeScroll();
// Check for change
if (isSpanChange() || isZoomChange())
{
// If computeScroll called before timer counts down we should drop it and
// start counter over again
resetMapChangeTimer();
}
}
// ------------------------------------------------------------------------
// TIMER RESETS
// ------------------------------------------------------------------------
private void resetMapChangeTimer()
{
StoreMapView.this.removeCallbacks(mOnChangeTask);
StoreMapView.this.postDelayed(mOnChangeTask, mEventsTimeout);
}
// ------------------------------------------------------------------------
// CHANGE FUNCTIONS
// ------------------------------------------------------------------------
private boolean isSpanChange()
{
return !mIsTouched && !getMapCenter().equals(mLastCenterPosition);
}
private boolean isZoomChange()
{
return (getZoomLevel() != mLastZoomLevel);
}
}
但是当我运行模拟器时，我得到一个像这样的空白屏幕。我该如何解决？
告诉我我在这里做错了什么。
嗨，我现在遇到了 log cat 错误。
01-03 07:28:02.585: E/MapActivity(3823): 无法获取连接工厂客户端
01-03 07:30:26.165: E/MapActivity(12298): 无法获取连接工厂客户端
我的安卓清单文件。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.fluturasymphony.recommendation"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="9"
android:targetSdkVersion="11" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
<activity android:label="@string/app_name" android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="org.achartengine.GraphicalActivity" />
<activity android:name=".CategoryWiseSalesChartActivity" />
<activity android:name=".ProductWiseSalesChartActivity" />
<activity android:label="@string/home_screen" android:name=".HomeActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/store_screen" android:name=".StoreActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/store_list_screen" android:name=".StoreListActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/location_screen" android:name=".StoreMapActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/recommended_products_list_screen" android:name=".RecommendedProductsListActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/category_wise_sales_screen" android:name=".CategoryWiseSalesActivity" android:configChanges="orientation">
</activity>
<activity android:label="@string/product_wise_sales_screen" android:name=".ProductWiseSalesActivity" android:configChanges="orientation">
</activity>
<uses-library android:name="com.google.android.maps" />
</application>
</manifest>