我创建了一个服务来从服务器接收车辆的位置并将其存储在LatLng的ArrayList中。它的工作正常。我想在地图活动中显示车辆的实时位置，并显示路径。我能够在地图活动本身上显示当前位置。地图工作正常。
但问题是如何从服务访问Arraylist位置并在地图活动中显示更新的位置？
我曾尝试使用广播接收器，但没有工作。
lo CS而V.Java :-
public class LocServ extends Service implements LocationListener {
private static final Location TODO = null;
// private static String url_insert_location = "http://172.20.10.4/testing/insert.php";
public static String LOG = "Log";
public static ArrayList<latlong> arr_lac = new ArrayList<latlong>();
static String journy_id;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
Log.i(LOG, "Service started");
Log.i("asd", "This is sparta");
journy_id = intent.getStringExtra("jid");
Log.i("journy_id",journy_id);
new SendPostRequest().execute();
Log.i("1234", "In onStartCommand");
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(Track_Vehicle_loc.mBroadcastStringAction);
broadcastIntent.putExtra("Data", "Broadcast Data");
sendBroadcast(broadcastIntent);
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
broadcastIntent.setAction(Track_Vehicle_loc.mBroadcastIntegerAction);
broadcastIntent.putExtra("Data", 10);
sendBroadcast(broadcastIntent);
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
broadcastIntent
.setAction(Track_Vehicle_loc.mBroadcastArrayListAction);
broadcastIntent.putExtra("Data", arr_lac);
sendBroadcast(broadcastIntent);
}
}).start();
return START_STICKY;
}
@Override
public void onCreate() {
super.onCreate();
Log.i(LOG, "Service created");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i(LOG, "Service destroyed");
}
public class SendPostRequest extends AsyncTask<String, Void, String> {
protected void onPreExecute(){
}
protected String doInBackground(String... arg0) {
try {
URL url = new URL("http://test.in/Api/getLocation.php/?"); // here is your URL path
JSONObject postDataParams = new JSONObject();
postDataParams.put("tripid", journy_id);
Log.e("params",postDataParams.toString());
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode=conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader in=new BufferedReader(new
InputStreamReader(
conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line="";
while((line = in.readLine()) != null) {
sb.append(line);
break;
}
in.close();
return sb.toString();
}
else {
return new String("false : "+responseCode);
}
}
catch(Exception e){
return new String("Exception: " + e.getMessage());
}
}
@Override
protected void onPostExecute(String result) {
try {
Log.i("1234","result:" + result);
if (result != null) {
final JSONObject jsobj = new JSONObject(result);
Log.i("jsobj",""+jsobj);
final String success_code = jsobj.getString("success");
final String success_message = jsobj.getString("message");
Log.i("success_code",""+success_code);
Log.i("success_message",""+success_message);
if (success_code.equals("1")) {
try {
JSONArray j_details = jsobj.getJSONArray("data");
Log.i("1234", "j_details:" + j_details);
for (int i=0;i<j_details.length();i++) {
JSONObject jobj = j_details.getJSONObject(i);
latlong ld = new latlong();
final Double lat = jobj.getDouble("lat");
final Double longi = jobj.getDouble("longi");
ld.setLat(lat);
ld.setLongi(longi);
arr_lac.add(ld);
}
} catch (JSONException ex) {
Log.i("Exception", ex.toString());
}
}
else
{
}
Log.e("pass 1", "connection success ");
} else {
}
}catch (Exception e){
Log.i("Exception",e.toString());
}
}
}
public String getPostDataString(JSONObject params) throws Exception {
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while (itr.hasNext()) {
String key = itr.next();
Object value = params.get(key);
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key, "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(), "UTF-8"));
}
return result.toString();
}
@Override
public void onLocationChanged(Location location) {
new SendPostRequest().execute();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
maps activity.Java :-
public class Track_Vehicle_loc extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
// check if GPS enabled
GPSTracker gpsTracker;
String tripid;
static Double startlat, startlongi, current_lat, current_longi;
Polyline line; //added
BookingData dataobj = new BookingData();
SharedPreferences sharedpreferences;
String Url,mobile_number,otp;
public static final String MyPREFERENCES = "MyPrefs" ;
public static final String Latkey = "latkey";
public static final String Longkey = "longkey";
public static ArrayList<latlong> arr_lac = new ArrayList<latlong>();
public static final String mBroadcastStringAction = "com.truiton.broadcast.string";
public static final String mBroadcastIntegerAction = "com.truiton.broadcast.integer";
public static final String mBroadcastArrayListAction = "com.truiton.broadcast.arraylist";
private IntentFilter mIntentFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_track__vehicle_loc);
gpsTracker = new GPSTracker(getApplicationContext());
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
Intent i = getIntent();
dataobj = (BookingData) i.getSerializableExtra("bookdata");
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(mBroadcastStringAction);
mIntentFilter.addAction(mBroadcastIntegerAction);
mIntentFilter.addAction(mBroadcastArrayListAction);
Intent serviceIntent = new Intent(getApplicationContext(), LocServ.class);
serviceIntent.putExtra("jid", dataobj.getJ_Id());
startService(serviceIntent);
}
@Override
public void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(mBroadcastStringAction)) {
Toast.makeText(context, "234"+intent.getStringExtra("Data"), Toast.LENGTH_SHORT).show();
} else if (intent.getAction().equals(mBroadcastIntegerAction)) {
Toast.makeText(context, "234"+intent.getIntExtra("Data",0), Toast.LENGTH_SHORT).show();
} else if (intent.getAction().equals(mBroadcastArrayListAction)) {
Toast.makeText(context, "234"+intent.getStringArrayListExtra("Data"), Toast.LENGTH_SHORT).show();
}
}
};
@Override
protected void onPause() {
unregisterReceiver(mReceiver);
super.onPause();
}
@Override
public void onBackPressed() {
super.onBackPressed();
stopService(new Intent(getApplicationContext(), LocServ.class));
finish();
}
@Override
public void onMapReady(GoogleMap googleMap) {
Double latitude = gpsTracker.getLatitude();
Double longitude = gpsTracker.getLongitude();
mMap = googleMap;
mMap.clear();
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
LatLng sydny = new LatLng(latitude, longitude);
final MarkerOptions marker = new MarkerOptions().position(sydny).title("Vehicle");
int height = 100;
int width = 100;
BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.drawable.caricon);
Bitmap b=bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
marker.icon(BitmapDescriptorFactory.fromBitmap(smallMarker));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(sydny, 16.0f));
mMap.addMarker(marker);
final Handler handler = new Handler();
final int delay = 1000; //milliseconds
// Log.i("arr_lac",arr_lac+"156");
handler.postDelayed(new Runnable(){
public void run(){
// arr_lac = LocServ.arr_lac;
handler.postDelayed(this, delay);
}
}, delay);
/*
if(arr_lac.size() > 2) {
int index = arr_lac.size() - 1;
latlong ll = arr_lac.get(index);
current_lat = ll.getLat();
current_longi = ll.getLongi();
Log.i("current_lat",current_lat+"156");
*//* PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
for (int i = 0; i < arr_lac.size(); i++) {
LatLng point = new LatLng(arr_lac.get(i).getLat(),arr_lac.get(i).getLongi());
options.add(point);
}
final Marker myMarker = mMap.addMarker(marker); //add Marker in current position
line = googleMap.addPolyline(options); //add Polyline
// setmarker(ll.getLat(), ll.getLongi(), mMap);
update_position(myMarker,ll.getLat(),ll.getLongi());
startlat = current_lat;
startlongi = current_longi;*//*
}
*/
}
public String getPostDataString(JSONObject params) throws Exception {
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while(itr.hasNext()){
String key= itr.next();
Object value = params.get(key);
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key, "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(), "UTF-8"));
}
return result.toString();
}
public void setmarker(Double stringLatitude,Double stringLongitude,GoogleMap googleMap){
Log.i("latlong",stringLatitude+"");
Log.i("latlong",stringLongitude+"");
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(stringLatitude, stringLongitude);
// create marker
MarkerOptions marker = new MarkerOptions().position(sydney).title("Vehicle");
int height = 100;
int width = 100;
BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.drawable.caricon);
Bitmap b=bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
marker.icon(BitmapDescriptorFactory.fromBitmap(smallMarker));
mMap.addMarker(marker);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(stringLatitude,stringLongitude), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(stringLatitude,stringLongitude)) // Sets the center of the map to location user
.zoom(17) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
public void update_position(Marker marker,Double lat,Double lati){
marker.setPosition(new LatLng(lat,lati));
}
}
你正在向arraylist发送一个你应该尝试这个link的活动
你必须添加arraylist作为你的MyCustomEvent()类的参数
使用JSONArray作为帮助程序将位置数据序列化为字符串...
// assume 'myPos' is your ArrayList<LatLng> with your position data.
JSONArray ja = new JSONArray();
for (LatLng p : myPos) {
JSONObject jo = new JSONObject();
jo.put("lat", p.latitude);
jo.put("lng", p.longitude);
ja.put(jo);
}
Intent intent = new Intent();
intent.putExtra("data", ja.toString());
// 'rxPos' is your receiving array list...
ArrayList<LatLng> rxPos = new ArrayList<LatLng>();
String s = intent.getStringExtra("data");
JSONArray jaRx = new JSONArray(s);
for (int i = 0; i < jaRx.length(); i++) {
JSONObject jo = jaRx.getJSONObject(i);
rxPos.add(new LatLng(jo.getDouble("lat"), jo.getDouble("lng")));
}
可能值得一提的是捆绑有一个大小限制，但不确定确切的数字 - 512kb？