我一直在思考和网上冲浪天，但在 0 生产力一周后，我决定提出这个模糊的问题。我的问题 - 有人可以告诉我如何在我的android项目中实现方向吗？
详细说明，我在这里要求的确切功能将在下一段中突出显示。
我的项目的目标：每当用户键入一个位置（它会在点击后隐藏键盘），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的最短旅行时间的路线。我不知道如何限制用户可以在其中搜索位置的国家/地区，但我很确定会放轻松。我已经拥有了我最终目标的点点滴滴，但并不是我真正想要的。
最后这是我的MainActivity。我已经引用了一些我没有在这里添加的类，所以，只需询问是否需要它们在您自己的编译器中运行此代码或其他：
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) {
}
}
答案 0 :(得分：-1)
在github上查看这个库：
jd-alexander/Google-Directions-Android
我在我的项目中使用它，您可以克隆它并根据您的特定需求进行修改。
你在问题中的逻辑看起来似乎是乍一看，但是为了限制搜索位置，我可能只需要搜索框中的任何查询并进行比较，看它是否在你提供的指定LatLngBounds内