以下是我的代码：
public class DetailDescription extends FragmentActivity implements LocationListener{
private static String TAG="DetailDescription";
GoogleMap mGoogleMap;
ArrayList<LatLng> mMarkerPoints;
double mLatitude=0;
double mLongitude=0;
private final static int DETAILS_TRUE=1;
private final static int DETAILS_FALSE=2;
private final static int DETAILS_ERROR=3;int position;
ConnectionDetector cd;GPSTracker gps;Boolean isInternetPresent = false;
protected void onCreate(Bundle savedInstanceState) {
cd = new ConnectionDetector(getApplicationContext());
ImageView imageview;
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
isInternetPresent = cd.isConnectingToInternet();
if (isInternetPresent) {
setContentView(R.layout.detaildescription);
}
else
{
// Internet connection is not present
// Ask user to connect to Internet
showAlertDialog(DetailDescription.this, "No Internet Connection",
"You don't have internet connection.", false);
}
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.header);
position=getIntent().getIntExtra("position", 0);
SharedData.pos1=position;
TextView txtHeader=(TextView)findViewById(R.id.txtHeader);
txtHeader.setText(SharedData.mAtm[position].name);
TextView adress=(TextView)findViewById(R.id.adress);
adress.setText(SharedData.mAtm[position].address);
Button btnBack=(Button)findViewById(R.id.btnBack);
btnBack.setVisibility(View.VISIBLE);
btnBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(DetailDescription.this,PlacesList.class);
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}
});
ImageButton btnNext=(ImageButton)findViewById(R.id.btnNext);
btnNext.setVisibility(View.VISIBLE);
btnNext.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(DetailDescription.this,PlaceFinder.class);
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}
});
locationn();
}
public void showAlertDialog(Context context, String title, String message, Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
// Setting Dialog Title
alertDialog.setTitle(title);
// Setting Dialog Message
alertDialog.setMessage(message);
// Setting alert dialog icon
alertDialog.setIcon((status) ? R.drawable.ic_launcher: R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
// Showing Alert Message
alertDialog.show();
}
private void locationn() {
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
// Initializing
mMarkerPoints = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
mGoogleMap = fm.getMap();
// Enable MyLocation Button in the Map
mGoogleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
else
{
Toast.makeText(DetailDescription.this, "Location can't be retrieved", 5000).show();
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
LatLng startPoint = new LatLng(mLatitude, mLongitude);
drawMarker(startPoint);
LatLng origin = mMarkerPoints.get(0);
LatLng dest = new LatLng(SharedData.mAtm[SharedData.pos1].lat, SharedData.mAtm[SharedData.pos1].lon);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
Marker marker= mGoogleMap.addMarker(new MarkerOptions().position(dest).title(SharedData.mAtm[position].address).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker1)));
marker.showInfoWindow();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
// TODO Auto-generated method stub
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = "origin="+origin.latitude+","+origin.longitude;
// Destination of route
String str_dest = "destination="+SharedData.mAtm[SharedData.pos1].lat+","+SharedData.mAtm[SharedData.pos1].lon;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
/** A class to download data from Google Directions URL */
private class DownloadTask extends AsyncTask<String, Void, String>{
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/** A class to parse the Google Directions in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(2);
lineOptions.color(Color.RED);
}
// Drawing polyline in the Google Map for the i-th route
mGoogleMap.addPolyline(lineOptions);
}
}
private void drawMarker(LatLng point){
mMarkerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if(mMarkerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
}else if(mMarkerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
mGoogleMap.addMarker(options);
}
@Override
public void onLocationChanged(Location location) {
// Draw the marker, if destination location is not set
if(mMarkerPoints.size() < 2){
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
LatLng point = new LatLng(mLatitude, mLongitude);
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(point));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
drawMarker(point);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
答案 0 :(得分：1)
以这种方式改变你的病情流，
public class DetailDescription extends FragmentActivity implements LocationListener
{
private static String TAG="DetailDescription";
GoogleMap mGoogleMap;
ArrayList<LatLng> mMarkerPoints;
double mLatitude=0;
double mLongitude=0;
private final static int DETAILS_TRUE=1;
private final static int DETAILS_FALSE=2;
private final static int DETAILS_ERROR=3;int position;
ConnectionDetector cd;GPSTracker gps;Boolean isInternetPresent = false;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
cd = new ConnectionDetector(getApplicationContext());
ImageView imageview;
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
isInternetPresent = cd.isConnectingToInternet();
if ( !isInternetPresent)
{
showAlertDialog(DetailDescription.this, "No Internet Connection",
"You don't have internet connection.", false);
}
else
{
setContentView(R.layout.detaildescription);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.header);
position=getIntent().getIntExtra("position", 0);
SharedData.pos1=position;
TextView txtHeader=(TextView)findViewById(R.id.txtHeader);
txtHeader.setText(SharedData.mAtm[position].name);
TextView adress=(TextView)findViewById(R.id.adress);
adress.setText(SharedData.mAtm[position].address);
Button btnBack=(Button)findViewById(R.id.btnBack);
btnBack.setVisibility(View.VISIBLE);
btnBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(DetailDescription.this,PlacesList.class);
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}
});
ImageButton btnNext=(ImageButton)findViewById(R.id.btnNext);
btnNext.setVisibility(View.VISIBLE);
btnNext.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(DetailDescription.this,PlaceFinder.class);
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}
});
locationn();
}
}
public void showAlertDialog(Context context, String title, String message, Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
// Setting Dialog Title
alertDialog.setTitle(title);
// Setting Dialog Message
alertDialog.setMessage(message);
// Setting alert dialog icon
alertDialog.setIcon((status) ? R.drawable.ic_launcher: R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
// Showing Alert Message
alertDialog.show();
}
private void locationn() {
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
// Initializing
mMarkerPoints = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
mGoogleMap = fm.getMap();
// Enable MyLocation Button in the Map
mGoogleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
else
{
Toast.makeText(DetailDescription.this, "Location can't be retrieved", 5000).show();
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
LatLng startPoint = new LatLng(mLatitude, mLongitude);
drawMarker(startPoint);
LatLng origin = mMarkerPoints.get(0);
LatLng dest = new LatLng(SharedData.mAtm[SharedData.pos1].lat, SharedData.mAtm[SharedData.pos1].lon);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
Marker marker= mGoogleMap.addMarker(new MarkerOptions().position(dest).title(SharedData.mAtm[position].address).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker1)));
marker.showInfoWindow();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
// TODO Auto-generated method stub
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = "origin="+origin.latitude+","+origin.longitude;
// Destination of route
String str_dest = "destination="+SharedData.mAtm[SharedData.pos1].lat+","+SharedData.mAtm[SharedData.pos1].lon;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
/** A class to download data from Google Directions URL */
private class DownloadTask extends AsyncTask<String, Void, String>{
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/** A class to parse the Google Directions in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(2);
lineOptions.color(Color.RED);
}
// Drawing polyline in the Google Map for the i-th route
mGoogleMap.addPolyline(lineOptions);
}
}
private void drawMarker(LatLng point){
mMarkerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if(mMarkerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
}else if(mMarkerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
mGoogleMap.addMarker(options);
}
@Override
public void onLocationChanged(Location location) {
// Draw the marker, if destination location is not set
if(mMarkerPoints.size() < 2){
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
LatLng point = new LatLng(mLatitude, mLongitude);
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(point));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
drawMarker(point);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}