我有一个google maps项目，您可以在其中输入一个地址，并且会显示一个标记，该地址，持续时间（乘车旅行）以及从用户位置到B点的距离。效果很好！
但是，我的问题是，每当我放置汽车无法访问的位置时，应用程序就会崩溃。我不是在寻找任何重要的东西，除了开车距离之外，我不需要任何其他东西，因此对于用户而言，告诉你不能在这里开车，对我来说很好。
我正在使用JSONParsing来解析UrlRequest之后的地址。腿，距离，持续时间，end_address，end-lat，end-lng是我从此文件中获取的值：
legs: [
{
distance: {
text: "547 km",
value: 547015
},
duration: {
text: "5 h 23 min",
value: 19361
},
end_address: "Montreal, Quebec, Kanada",
end_location: {
lat: 45.5017123,
lng: -73.5672184
},
start_address: "Toronto, Ontario, Kanada",
start_location: {
lat: 43.6533096,
lng: -79.3827656
},
steps: [
{
distance: {
text: "0,3 km",
value: 280
},
duration: {
text: "1 min",
value: 66
},
end_location: {
lat: 43.6557259,
lng: -79.3837337
},
html_instructions: "",
polyline: {
points: "e`miGhmocNs@Rm@N]JmA^KBcAZSFWHe@Nk@Pa@Le@L"
},
start_location: {
lat: 43.6533096,
lng: -79.3827656
},
travel_mode: "DRIVING"
},
所以我的问题是，对于这种方法要运行什么样的条件，是否有人有任何建议？
if(!=travel_mode: "DRIVING")
{
Toast.makeText(MapsActivity.this, "You cannot drive there",
Toast.LENGTH:SHORT).show();
}
else
{
execute code;
}
获取travel_mode并以某种方式将其作为条件？先感谢您！
我的整个代码
主类，当您按下按钮时，地址将被转换
private void init() {
searchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
dataTransfer = new Object[2];
url = getDirectionsUrl();
GetDistances getDistances = new GetDistances();
dataTransfer[0] = mMap;
dataTransfer[1] = url;
getDistances.execute(dataTransfer);
return false;
}
});
建立网址...
private String getDirectionsUrl()
{
//WORKS
//https://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&key=API_KEY"
StringBuilder googleDirectionsUrl = new StringBuilder("https://maps.googleapis.com/maps/api/directions/json?");
//Possible two textfields with origin being another textfield
googleDirectionsUrl.append("origin="+myLat+","+myLng);
googleDirectionsUrl.append("&destination="+searchText.getText().toString());
googleDirectionsUrl.append("&key="+"API_KEY");
return googleDirectionsUrl.toString();
}
发送要解析的网址...
public class DataParser {
private HashMap<String, String> getDuration(JSONArray googleDirectionsJson) {
HashMap<String, String> googleDirectionsMap = new HashMap<>();
String duration = "";
String distance = "";
String title = "";
Log.d("json response", googleDirectionsJson.toString());
try {
duration = googleDirectionsJson.getJSONObject(0).getJSONObject("duration").getString("text");
distance = googleDirectionsJson.getJSONObject(0).getJSONObject("distance").getString("text");
title = googleDirectionsJson.getJSONObject(0).getString("end_address");
googleDirectionsMap.put("duration", duration);
googleDirectionsMap.put("distance", distance);
googleDirectionsMap.put("end_address", title);
} catch (JSONException e) {
e.printStackTrace();
}
return googleDirectionsMap;
}
public HashMap<String, String> parseDirections(String jsonData) {
JSONArray jsonArray = null;
JSONObject jsonObject;
try {
jsonObject = new JSONObject(jsonData);
jsonArray = jsonObject.getJSONArray("routes").getJSONObject(0).getJSONArray("legs");
} catch (JSONException e) {
e.printStackTrace();
}
return getDuration(jsonArray);
}
private HashMap<String, Double> getLatLng(JSONArray googleLatLngJson) {
HashMap<String, Double> googleLatLngMap = new HashMap<>();
Double latitude = 0.0;
Double longitude = 0.0;
try {
latitude = googleLatLngJson.getJSONObject(0).getJSONObject("end_location").getDouble("lat");
longitude = googleLatLngJson.getJSONObject(0).getJSONObject("end_location").getDouble("lng");
googleLatLngMap.put("lat", latitude);
googleLatLngMap.put("lng", longitude);
Log.d("json response", googleLatLngMap.toString());
} catch (JSONException e) {
e.printStackTrace();
}
return googleLatLngMap;
}
public HashMap<String, Double> parseLatLng(String jsonData) {
JSONArray jsonArray = null;
JSONObject jsonObject;
try {
jsonObject = new JSONObject(jsonData);
jsonArray = jsonObject.getJSONArray("routes").getJSONObject(0).getJSONArray("legs");
} catch (JSONException e) {
e.printStackTrace();
}
return getLatLng(jsonArray);
}
}
从JSONparsed哈希图中获取值，然后将其放入新的哈希图中，以添加带有其值的标记
public class GetDistances extends AsyncTask<Object, String, String>{
GoogleMap mMap;
String url;
String googleDirectionsData;
String duration, distance;
Double latitude, longitude;
LatLng latLng;
String title;
@Override
protected String doInBackground(Object... objects) {
mMap = (GoogleMap)objects[0];
url = (String)objects[1];
HttpHandler httpHandler = new HttpHandler();
try
{
googleDirectionsData = httpHandler.readUrl(url);
}
catch(IOException e)
{
e.printStackTrace();
}
return googleDirectionsData;
}
@Override
protected void onPostExecute(String s)
{
DataParser parser = new DataParser();
HashMap<String, String> directionsList = null;
directionsList = parser.parseDirections(s);
duration = directionsList.get("duration");
distance = directionsList.get("distance");
title = directionsList.get("end_address");
HashMap<String, Double> positionList = null;
positionList = parser.parseLatLng(s);
latitude = positionList.get("lat");
longitude = positionList.get("lng");
latLng = (new LatLng(latitude, longitude));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 13));
MarkerOptions markerOptions = new MarkerOptions()
.position(latLng)
.draggable(true)
.title(title);
markerOptions.snippet("Distance: " + distance + ", " + "Duration: " + duration);
mMap.addMarker(markerOptions);
}
}
“ API_KEY”-是我的实际密钥，只是试图将其保密。
解决了
我只是在onPostExecute方法中进行了尝试，它解决了崩溃问题。
public class GetDestination extends AsyncTask<Object, String, String>{
GoogleMap mMap;
String url;
String googleDirectionsData;
String duration, distance;
Double latitude, longitude;
LatLng latLng;
String title;
private static Context context;
public GetDestination(Context c){
context = c;
}
public static void showToast(){
Toast.makeText(context, "You can't drive through the oceans!", Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(Object... objects) {
mMap = (GoogleMap)objects[0];
url = (String)objects[1];
HttpHandler httpHandler = new HttpHandler();
try
{
googleDirectionsData = httpHandler.readUrl(url);
}
catch(IOException e)
{
e.printStackTrace();
}
return googleDirectionsData;
}
@Override
protected void onPostExecute(String s)
{
try {
DataParser parser = new DataParser();
HashMap<String, String> directionsList = null;
directionsList = parser.parseDirections(s);
duration = directionsList.get("duration");
distance = directionsList.get("distance");
title = directionsList.get("start_address");
HashMap<String, Double> positionList = null;
positionList = parser.parseLatLng(s);
latitude = positionList.get("lat");
longitude = positionList.get("lng");
latLng = (new LatLng(latitude, longitude));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 13));
MarkerOptions markerOptions = new MarkerOptions()
.position(latLng)
.draggable(true)
.title(title);
markerOptions.snippet("Distance: " + distance + ", " + "Duration: " + duration);
mMap.addMarker(markerOptions);
}
catch (Exception e)
{
showToast();
e.printStackTrace();
}
}
}
确保在Mainactivity类中传递上下文，
searchText1.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
dataTransfer = new Object[2];
url = getDirectionsUrl();
GetDestination getDestination = new GetDestination(MapsActivity.this);
dataTransfer[0] = mMap;
dataTransfer[1] = url;
getDestination.execute(dataTransfer);
return false;
}
});
最佳答案
您自己解决了这个问题真是太好了。恭喜。
但是更好的方法是在响应中放入log并检查两个responses之间的差异，即drivable and not drivable。
这样，您可以读取确切的响应，并根据响应可以向用户显示不同的消息。
当然，try, catch可以在那里处理任何类型的异常。
希望这可以帮助。
关于android - 当您无法开车前往某个位置时，Google Maps崩溃，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49943246/