Я пытаюсь создать приложение, которое использует функции панорамирования и масштабирования на карте.Я потратил много времени, пытаясь реализовать это.Сначала я попытался создать метод касания внутри MapActivity, но вскоре понял, что это будет немного больше.Я нашел некоторый код, который я пытался реализовать, который создал подкласс mapview и столкнулся с некоторыми проблемами с ним.Мне нужна помощь с панорамированием по карте.Везде, где я пытаюсь очистить и отобразить оверлей, возникают проблемы.Либо наложения удаляются и отображаются в неправильном месте, либо создается цикл, вызывающий мигание.Пожалуйста, дайте мне знать, что мне нужно сделать, чтобы это работало.Я понял, что мне может понадобиться переопределить метод onScroll, если он есть вместо метода onTouch.Прямо сейчас это довольно глючно, мне нужна помощь, чтобы я мог сделать это без ошибок.Дайте мне знать, если мое мышление правильно.Мне нужно немедленно вывести это на рынок.Вот мой кодЗаранее спасибо.
// Класс MapActivity // Имя пакета опущено
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
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.Overlay;
import com.google.android.maps.OverlayItem;
public class MapActivityNearby extends MapActivity {
private static final String TAG = "MAPACTIVITY";
double lat;
double lng;
EnhancedMapView mv;
ArrayList<MapItem> allCats;
private static final String PREF_NAME = "cookie";
private float latMax;
private float latMin;
private float longMax;
private float longMin;
GeoPoint p;
private List<Overlay> mapOverlays;
private MyItemizedOverlay itemizedOverlay;
boolean waitTime = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_nearby);
LinearLayout ll = (LinearLayout) findViewById(R.id.maplayout);
mv = new EnhancedMapView(this, "0ieXSx8GEy9Hm7bCZMLckus7pmPKg0w8kelRO_g");
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
mv.setLayoutParams(lp);
mv.setClickable(true);
mv.setBuiltInZoomControls(true);
mv.setOnZoomChangeListener(new EnhancedMapView.OnZoomChangeListener() {
@Override
public void onZoomChange(MapView view, int newZoom, int oldZoom) {
Log.v("test", "zoom center changed");
if (isNetworkAvailable(MapActivityNearby.this))
{
LogIn log = new LogIn();
log.execute(mv);
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(MapActivityNearby.this);
builder.setMessage("No network connection. Please try again when your within coverage area.")
.setTitle("Network Connection")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//close dialog
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
});
mv.setOnPanChangeListener(new EnhancedMapView.OnPanChangeListener() {
public void onPanChange(MapView view, GeoPoint newCenter, GeoPoint oldCenter) {
Log.v("test", "pan center changed");
if (isNetworkAvailable(MapActivityNearby.this))
{
LogIn log = new LogIn();
log.execute(mv);
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(MapActivityNearby.this);
builder.setMessage("No network connection. Please try again when your within coverage area.")
.setTitle("Network Connection")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//close dialog
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
});
ll.addView(mv);
SharedPreferences cookies = getSharedPreferences(PREF_NAME,
Context.MODE_PRIVATE);
lat = Double.parseDouble(cookies.getString("lat", "0"));
lng = Double.parseDouble(cookies.getString("lng", "0"));
GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
MapController mapControl = mv.getController();
mapControl.setCenter(p);
mapControl.setZoom(11);
}
public void onResume()
{
super.onResume();
if (isNetworkAvailable(MapActivityNearby.this))
{
LogIn log = new LogIn();
log.execute(mv);
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(MapActivityNearby.this);
builder.setMessage("No network connection. Please try again when your within coverage area.")
.setTitle("Network Connection")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//close dialog
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
public void plotPoints(ArrayList<MapItem> i) {
mapOverlays = mv.getOverlays();
// first overlay
Drawable drawable;
drawable = getResources().getDrawable(R.drawable.marker);
itemizedOverlay = new MyItemizedOverlay(drawable, mv);
mapOverlays.add(itemizedOverlay);
for (MapItem x : i) {
GeoPoint point = new GeoPoint((int) (x.getLat() * 1E6),
(int) (x.getLng() * 1E6));
OverlayItem overlayItem = new OverlayItem(point,
x.getTitle(), x.getSubtitle());
itemizedOverlay.addOverlay(overlayItem);
}
}
private class LogIn extends AsyncTask<EnhancedMapView, Void, Boolean> {
String result = "";
InputStream is;
@Override
protected void onPreExecute() {
}
@Override
protected Boolean doInBackground(EnhancedMapView...params) {
if (!(mv.getOverlays().isEmpty()))
{
mv.getOverlays().clear();
}
int maxCount = 100;
EnhancedMapView mapView = params[0];
for (int i = 0; i < maxCount; i++)
{
p = mapView.getMapCenter();
float latCenter = (float) (p.getLatitudeE6()) / 1000000;
float longCenter = (float) (p.getLongitudeE6()) / 1000000;
float latSpan = (float) (mapView.getLatitudeSpan()) / 1000000;
float longSpan = (float) (mapView.getLongitudeSpan()) / 1000000;
latMax = latCenter + (latSpan/2);
latMin = latCenter - (latSpan/2);
longMax = longCenter + (longSpan/2);
longMin = longCenter - (longSpan/2);
if (latMin == latMax)
{
try
{
Thread.sleep(80);
}
catch(InterruptedException e)
{
}
}
else
{
p = mapView.getMapCenter();
latCenter = (float) (p.getLatitudeE6()) / 1000000;
longCenter = (float) (p.getLongitudeE6()) / 1000000;
latSpan = (float) (mapView.getLatitudeSpan()) / 1000000;
longSpan = (float) (mapView.getLongitudeSpan()) / 1000000;
latMax = latCenter + (latSpan/2);
latMin = latCenter - (latSpan/2);
longMax = longCenter + (longSpan/2);
longMin = longCenter - (longSpan/2);
break;
}
}
log(latMin);
log(latMax);
try {
final String catURL = "url goes here";
log(catURL.toString());
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(catURL);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
waitTime = true;
nameValuePairs.add(new BasicNameValuePair("PHPSESSID", getCookie()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
result = convertStreamToString();
log(result);
allCats = new ArrayList<MapItem>();
JSONObject object = new JSONObject(result);
JSONArray temp = object.getJSONArray("l");
log("Starting download");
log(temp.length());
long start = System.currentTimeMillis();
for (int k = 0; k < temp.length(); k++) {
JSONObject j = temp.getJSONObject(k);
MapItem c = new MapItem();
c.setObject_id(j.getInt("object_id"));
c.setTitle(j.getString("title"));
c.setColor(j.getString("color"));
c.setLat(j.getDouble("lat"));
c.setLng(j.getDouble("lng"));
c.setSubtitle(j.getString("subtitle"));
allCats.add(c);
log(allCats.toString());
}
long end = System.currentTimeMillis();
log("Download Took: " + (end - start) / 1000 + " seconds.");
// log(allCats.toString());
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
@Override
protected void onPostExecute(Boolean result) {
// pBar.setVisibility(View.GONE);
plotPoints(allCats);
}
private String convertStreamToString() {
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
result.trim();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
return result;
}
}
public String getCookie() {
String cookie = "";
SharedPreferences cookies = getSharedPreferences(PREF_NAME,
Context.MODE_PRIVATE);
if (cookies.contains("cookie")) {
cookie = cookies.getString("cookie", "null");
}
return cookie;
}
private void log(Object obj) {
Log.d(TAG, TAG + " :: " + obj.toString());
}
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
// Класс CustomMapView // Имя пакета опущено
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
public class EnhancedMapView extends MapView {
public interface OnZoomChangeListener {
public void onZoomChange(MapView view, int newZoom, int oldZoom);
}
public interface OnPanChangeListener {
public void onPanChange(MapView view, GeoPoint newCenter, GeoPoint oldCenter);
}
private EnhancedMapView _this;
// Set this variable to your preferred timeout
private long events_timeout = 500L;
private boolean is_touched = false;
private GeoPoint last_center_pos;
private int last_zoom;
private Timer zoom_event_delay_timer = new Timer();
private Timer pan_event_delay_timer = new Timer();
private EnhancedMapView.OnZoomChangeListener zoom_change_listener;
private EnhancedMapView.OnPanChangeListener pan_change_listener;
public EnhancedMapView(Context context, String apiKey) {
super(context, apiKey);
_this = this;
last_center_pos = this.getMapCenter();
last_zoom = this.getZoomLevel();
}
public EnhancedMapView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public EnhancedMapView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setOnZoomChangeListener(EnhancedMapView.OnZoomChangeListener l) {
zoom_change_listener = l;
}
public void setOnPanChangeListener(EnhancedMapView.OnPanChangeListener l) {
pan_change_listener = l;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (ev.getAction() == 1) {
is_touched = false;
} else {
is_touched = true;
}
return super.onTouchEvent(ev);
}
@Override
public void computeScroll() {
super.computeScroll();
if (getZoomLevel() != last_zoom) {
// if computeScroll called before timer counts down we should drop it and start it over again
zoom_event_delay_timer.cancel();
zoom_event_delay_timer = new Timer();
zoom_event_delay_timer.schedule(new TimerTask() {
@Override
public void run() {
zoom_change_listener.onZoomChange(_this, getZoomLevel(), last_zoom);
last_zoom = getZoomLevel();
}
}, events_timeout);
}
// Send event only when map's center has changed and user stopped touching the screen
if (!last_center_pos.equals(getMapCenter()) || !is_touched) {
pan_event_delay_timer.cancel();
pan_event_delay_timer = new Timer();
pan_event_delay_timer.schedule(new TimerTask() {
@Override
public void run() {
pan_change_listener.onPanChange(_this, getMapCenter(), last_center_pos);
last_center_pos = getMapCenter();
}
}, events_timeout);
}
}
}