我目前正在开发一个专注于健身的应用程序。我的基本想法是让人们跟踪他们的速度，距离和时间。到目前为止，我已经设法通过使用位置管理器getSpeed（）来提高速度。我想知道如何获得旅行的距离？ 我寻找了一些样本，但对我来说有点困惑，因为我刚刚开始使用android。 我将不胜感激任何帮助或建议，谢谢
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_track);
start = (Button) findViewById(R.id.btnStart);
speed = (TextView)findViewById(R.id.txtSpeed);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
//initialize location listener
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
getSpeed(location);
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
//get the speed from the given location updates
public void getSpeed(Location location) {
currentSpeed = (location.getSpeed()*3600/1000);
String convertedSpeed = String.format("%.2f",currentSpeed);
speed.setText(convertedSpeed + "Km/h");
}
public void getDistance(Location location){
}
};
答案 0 :(得分：4)
尝试使用此： http://googlemaps.github.io/android-maps-utils/javadoc/com/google/maps/android/SphericalUtil.html
对于您获得的每个位置，您创建一个LatLng并将其添加到ArrayList。 然后使用此功能可以获得正确的长度：
SphericalUtil.computeLength(latLngs);
摇篮：
dependencies {
compile 'com.google.maps.android:android-maps-utils:0.4+'
}
编辑： 你有一个全局的Arraylist locations = new ArrayList。 在你的＆＃34; onLocationChanged＆＃34;你添加到位置：
@Override
public void onLocationChanged(Location location) {
locations.add(location);
}
然后在需要时你做：
for (Location loc : locations){
latLngs.add(new LatLng(loc.getLocation().getLat(), loc.getLocation().getLng()));
}
Double dist = SphericalUtil.computeLength(latLngs);
答案 1 :(得分：0)
//*****this is for log in and gcm reg id passsing in back end
private class communicate_server_for_get_2_position_duration extends AsyncTask<String, Void, String> {
static final String TAG = "rvms";
Context getcontext;
String lat1 = null, lng1 = null, lat2 = null, lng2 = null;
String getcontent_for_validate, content;
public communicate_server_for_get_2_position_duration(Context context, double lat, double lng, double lat2, double lng2) {
getcontext = context;
lat1 = String.valueOf(lat);
lng1 = String.valueOf(lng);
this.lat2 = String.valueOf(lat2);
this.lng2 = String.valueOf(lng2);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
try {
} catch (Exception e) {
finish();
}
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
BufferedReader reader;
String url_data = null;
try {
url_data = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" + lat1 + "," + lng1 + "&destinations=" + lat2 + "," + lng2 + "&mode=driving&language=en-EN";
url_data = url_data.replace("\n", "%20");
url_data = url_data.replace(" ", "%20");
url_data = url_data.replace("'", "%20");
} catch (Exception e) {
}
Log.i("pavan", "url" + url_data);
try {
URL url = new URL(url_data);
URLConnection conection = url.openConnection();
conection.setConnectTimeout(5000);
conection.setDoOutput(true);
reader = new BufferedReader(new InputStreamReader(conection.getInputStream()));
StringBuilder result = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
result.append(line + "");
}
content = result.toString();
System.out.print(result);
System.out.println(content);
getcontent_for_validate = content;
} catch (Exception e) {
e.printStackTrace();
}
return content;
}
@Override
protected void onPostExecute(String result) {
JSONObject jsonobj;
// TODO Auto-generated method stub
super.onPostExecute(result);
//Toast.makeText(context,"response "+result,Toast.LENGTH_LONG).show();
String distance = null, duration = null;
if (result != null) {
if (content.equals("failure")) {
} else {//ths is getting data for vehicl_list_unread_count code, client id,restapi_key
JSONObject location1, location2;
String location_string1 = null;
try {
JSONObject ret = new JSONObject(getcontent_for_validate);
// Toast.makeText(getApplicationContext(),"this is get content"+jsonobj.toString(),Toast.LENGTH_SHORT).show();
// System.out.println("this is get content"+jsonobj.toString());
try {
location1 = ret.getJSONArray("rows").getJSONObject(0);
location2 = location1.getJSONArray("elements").getJSONObject(0);
JSONObject get_distance = location2.getJSONObject("distance");
distance = get_distance.getString("text");
JSONObject get_duration = location2.getJSONObject("duration");
duration = get_duration.getString("text");
Log.d("test", "formattted address:" + location_string1);
} catch (JSONException e1) {
e1.printStackTrace();
}
} catch (JSONException e1) {
e1.printStackTrace();
}
try {
if (key_for_intent_data_from.equals("from current location")) {
// fabBtn.show（）; // String formattedDate = new SimpleDateFormat（“yyyy-MM-dd hh：mm aa”）。format（Calendar.getInstance（）。getTime（））; / 日历c = Calendar.getInstance（）; SimpleDateFormat sdf = new SimpleDateFormat（“yyyy-MM-dd hh：mm：ss aa”）; String formattedDate = sdf.format（c.getTime（））; / / * TimeZone utc = TimeZone.getTimeZone（“etc / UTC”）; DateFormat inputFormat = new SimpleDateFormat（“dd MMM，yyyy HH：mm”，Locale.US）; inputFormat.setTimeZone（UTC）; DateFormat outputFormat = new SimpleDateFormat（“dd MMM，yyyy hh：mm aa”，Locale.US）; outputFormat.setTimeZone（UTC）;
Date date = inputFormat.parse(input);
String output = outputFormat.format(date);*/
// fabBtn.setVisibility(View.VISIBLE);
//currentDateTimeString = java.text.DateFormat.getDateTimeInstance().format(new java.util.Date());
duration_text_view.setText("\nPresent DATE/TIME: " + currentDateTimeString + "\nDevice DATE/TIME: " + deviceTime + "\nLOCATION: " + distance + " from your location point.");
} else {
String snackbar_data = null;
snackbar_data = "Date/Time:" + deviceTime + "\nLocation:" + distance + " from your location point.";
View parentLayout = findViewById(R.id.map);
Snackbar snackbar = Snackbar
.make(parentLayout, snackbar_data, Snackbar.LENGTH_INDEFINITE)
.setAction("CLOSE", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
//更改消息文本颜色 snackbar.setActionTextColor（Color.RED）;
//更改操作按钮文字颜色 查看sbView = snackbar.getView（）; TextView textView =（TextView）sbView.findViewById（android.support.design.R.id.snackbar_text）; textView.setTextColor（Color.WHITE）; textView.setLines（5）; snackbar.show（）;
}
} catch (Exception e) {
}
}
} else {
Toast.makeText(getcontext, "Check net connection", Toast.LENGTH_LONG).show();
}
}
}