public class MapsActivity extends AppCompatActivity
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
MarkerOptions markerOptions;
EditText ed_place;
Button btn_getLocation;
Geocoder geocoder;
List<Address> addresses;
double lat, lng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
ed_place = findViewById(R.id.ed_place);
btn_getLocation = findViewById(R.id.btn_getLocation);
getSupportActionBar().setTitle("Map Location Activity");
mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
geocoder = new Geocoder(this, Locale.getDefault());
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//Initialize Google Play Services
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
} else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
btn_getLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
addresses = geocoder.getFromLocationName(ed_place.getText().toString(), 1);
} catch (IOException e) {
e.printStackTrace();
}
if (addresses == null) {
Toast.makeText(getApplicationContext(), "Invalid address", Toast.LENGTH_SHORT).show();
} else {
mGoogleMap.clear();
lat = addresses.get(0).getLatitude();
lng = addresses.get(0).getLongitude();
LatLng position = new LatLng(lat, lng);
markerOptions = new MarkerOptions();
markerOptions.position(position);
markerOptions.snippet("Latitude" + lat + "Longitude" + lng);
mGoogleMap.addMarker(markerOptions);
CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(position);
mGoogleMap.moveCamera(updatePosition);
Toast.makeText(getApplicationContext(), lat + " :" + lng, Toast.LENGTH_SHORT).show();
}
}
});
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 11));
}
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
}
}
}
这是我的地图活动。我使用地理编码来获取位置的纬度和经度并标记它。当我搜索错误的位置时，应用程序崩溃。如何在搜索无效位置时设置错误消息。
答案 0 :(得分：0)
是的，每当我们尝试在地图上搜索错误的位置时都会发生这种情况，因为您可以将使用地理编码器的地点的搜索代码放入try catch块并处理异常并向用户显示无效搜索的消息。
答案 1 :(得分：0)
使用此代码
try {
Geocoder geoCoder = new Geocoder(this);
List<Address> matches = geoCoder.getFromLocation(lat, lng, 1);
Address bestMatch = (matches.isEmpty() ? null : matches.get(0));
if (bestMatch != null) {
LatLng ltlng= new LatLng(bestMatch.getLatitude(),bestMatch.getLongitude());
Searchmarker = mMap.addMarker(new MarkerOptions().position(ltlng));
mMap.animateCamera(CameraUpdateFactory.newLatLng(ltlng));
} else {
Toast.makeText(this, "No result found", Toast.LENGTH_LONG).show();
}
}catch (Exception e){
Toast.makeText(this, "Error search :- Wrong input", Toast.LENGTH_LONG).show();
}