【发布时间】：2016-11-18 23:14:04
【问题描述】：
几天我一直在思考和上网，但是在大约 0 一周的工作效率之后，我决定问这个模糊的问题。我的问题 - 谁能告诉我如何在我的 android 项目中实施指示？
为了详细说明，我在这里询问的确切功能将在下一段中突出显示。
我的项目的目标：每当用户输入一个位置（单击 go 后它将隐藏键盘），它将转到该位置并在那里放置一个标记。 然后它将显示当前位置和标记之间旅行时间最短的路线。我不知道如何限制用户可以搜索位置的国家，但我很确定会放轻松。我已经有了最终目标的零碎部分，但并不是我真正需要的。
最后这是我的 MainActivity。我在这里引用了一些我没有添加的类，所以只需询问您是否需要它们在您自己的编译器中运行此代码或以其他方式运行此代码：
public class MainActivity extends FragmentActivity
implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
@SuppressWarnings("unused")
private static final int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9002;
@SuppressWarnings("unused")
private static final String LOGTAG = "Maps";
private static final int GPS_ERRORDIALOG_REQUEST = 9001;
private static final float DEFAULTZOOM = 15;
private GoogleApiClient mGoogleApiClient;
private LocationListener mListener;
private Marker marker;
ArrayList<LatLng> mMarkerPoints;
GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (servicesOK()) {
setContentView(R.layout.activity_main);
if (initMap()) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
} else {
Toast.makeText(this, "Hmmm. Maps didn't load.", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(this, "There's something wrong with your play services", Toast.LENGTH_SHORT).show();
}
UiSettings config = mMap.getUiSettings();
config.setMapToolbarEnabled(false);
config.setZoomControlsEnabled(false);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.legal:
Intent intent = new Intent(this, LicenseActivity.class);
startActivity(intent);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onPause() {
super.onPause();
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, mListener);
}
@Override
protected void onResume() {
super.onResume();
MapStateManager mgr = new MapStateManager(this);
CameraPosition position = mgr.getSavedCameraPosition();
if (position != null) {
CameraUpdate update = CameraUpdateFactory.newCameraPosition(position);
mMap.moveCamera(update);
mMap.setMapType(mgr.getSavedMapType());
}
}
@Override
protected void onStop() {
super.onStop();
MapStateManager mgr = new MapStateManager(this);
mgr.saveMapState(mMap);
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
public boolean servicesOK() {
int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS) {
return true;
} else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
dialog.show();
} else {
Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
}
return false;
}
private boolean initMap() {
if (mMap == null) {
MapFragment mapFrag =
(MapFragment) getFragmentManager().findFragmentById(R.id.map);
mMap = mapFrag.getMap();
}
return (mMap != null);
}
@SuppressWarnings("unused")
private void gotoLocation(double lat, double lng) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLng(ll);
mMap.moveCamera(update);
}
private void gotoLocation(double lat, double lng,
float zoom) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
mMap.moveCamera(update);
}
public void geoLocate(View v) throws IOException {
EditText et = (EditText) findViewById(R.id.editText1);
String location = et.getText().toString();
if (location.length() == 0) {
Toast.makeText(this, "Please enter a location", Toast.LENGTH_SHORT).show();
return;
}
hideSoftKeyboard(v);
Geocoder gc = new Geocoder(this);
List<Address> list = gc.getFromLocationName(location, 1);
Address add = list.get(0);
String locality = add.getLocality();
Toast.makeText(this, locality, Toast.LENGTH_LONG).show();
double lat = add.getLatitude();
double lng = add.getLongitude();
gotoLocation(lat, lng, DEFAULTZOOM);
if (marker != null) {
marker.remove();
}
MarkerOptions options = new MarkerOptions()
.position(new LatLng(lat, lng));
marker = mMap.addMarker(options);
}
private void hideSoftKeyboard(View v) {
InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
public void showCurrentLocation(MenuItem item) {
int permCheck = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION);
if (permCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
Location currentlocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (currentlocation == null) {
Toast.makeText(this, "Couldn't find you!", Toast.LENGTH_SHORT).show();
} else {
LatLng latlng = new LatLng(
currentlocation.getLatitude(),
currentlocation.getLongitude()
);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(
latlng, 15
);
mMap.animateCamera(update);
}
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
int permCheck = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION);
if (permCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
Toast.makeText(this, "Go go go!", Toast.LENGTH_SHORT).show();
mListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
gotoLocation(location.getLatitude(), location.getLongitude(), 15);
}
};
LocationRequest request = LocationRequest.create();
request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
request.setInterval(20000);
request.setFastestInterval(0);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, request, mListener
);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
【问题讨论】：
-
这是juuuuust问的：stackoverflow.com/questions/38400355/…
-
@mastrgamr 哇！当我输入问题时，它没有弹出相关的问题，而且我之前找不到这个（显然是因为它发生在一小时前）。非常感谢！
标签： android google-maps google-maps-markers google-maps-api-2 google-directions-api