Design
How do Android Google Maps search location using geocoder
The Geocoder class is used to search locations in the Google Map API and to handle geocoding and reverse geocoding. The process to convert the street address into a coordinate (latitude, longitude) is called Geocoding. The process to convert a coordinate (latitude, longitude) into an address is called Reverse geocoding.
Methods of Geocoder class:
- ListgetFromLocation(double latitude, double longitude, int maxResults): The ListgetFromLocation(double latitude, double longitude, int maxResults) method is used to return an array of Address to define the surrounding latitude and longitude.
- ListgetFromLocationName(String location, int results, double leftLatitude, double leftLongitude, double rightLatitude, double rightLongitude): The ListgetFromLocationName(String location, int results, double leftLatitude, double leftLongitude, double rightLatitude, double rightLongitude) method is used to return an array of Address to describe the given location such as place, an address, etc.
- ListgetFromLocationName(String location, int results): The ListgetFromLocationName(String location, int results) is used to return an array of Address to describe the given location such as place, an address, etc.
- static boolean isPresent(): The static boolean isPresent() method is used to return true if the methods getFromLocation() and getFromLocationName() are implemented.
Code: To convert location name into coordinate:
ListaddressList = geocoder.getFromLocationName(location, 1); Address address = addressList.get(0); LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude()); |
Example of Android Google Map API Searching Location:
In the below example, we are using the Google Map to search the input location.
activity_maps.xml:
In the activity_maps.xml file, we will add a fragment (SupportMapFragment), EditText and Button.
|
build.gradle:
In the build.gradle file, we will add the following dependencies.
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.mapapp"
minSdkVersion 23
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.google.android.gms:play-services-maps:11.8.0'
implementation 'com.google.android.gms:play-services-location:11.8.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
} |
MapsActivity.java:
In the MapsActivity.java file, we will add the below code.
package com.example.mapapp;
import android.location.Address;
import android.location.Geocoder;
import android.os.Build;
import android.os.Bundle;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.location.LocationServices;
import android.location.Location;
import android.Manifest;
import android.content.pm.PackageManager;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import java.io.IOException;
import java.util.List;
import androidx.fragment.app.FragmentActivity;
import androidx.core.content.ContextCompat;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
LocationListener,GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener{
private GoogleMap mMap;
Location mLastLocation;
Marker mCurrLocationMarker;
GoogleApiClient mGoogleApiClient;
LocationRequest mLocationRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
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,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@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_GREEN));
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
public void searchLocation(View view) {
EditText locationSearch = (EditText) findViewById(R.id.editText);
String location = locationSearch.getText().toString();
ListaddressList = null; if (location != null || !location.equals("")) { Geocoder geocoder = new Geocoder(this); try { addressList = geocoder.getFromLocationName(location, 1); } catch (IOException e) { e.printStackTrace(); } Address address = addressList.get(0); LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude()); mMap.addMarker(new MarkerOptions().position(latLng).title(location)); mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng)); Toast.makeText(getApplicationContext(),address.getLatitude()+" "+address.getLongitude(),Toast.LENGTH_LONG).show(); } } } |
AndroidManifest.xml:
In the AndroidManifest.xml file, we will add the below user-permissions.
Required Permission:
File: AndroidManifest.xml:
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