Android谷歌地圖使用地理編碼器搜索位置
在之前的Android谷歌地圖和Android谷歌地圖顯示當(dāng)前位置的教程中，我們分別介紹了顯示基本谷歌地圖和當(dāng)前位置的功能。愛掏網(wǎng) - it200.com
現(xiàn)在，在這個(gè)教程中我們將實(shí)現(xiàn)谷歌地圖的位置搜索功能。愛掏網(wǎng) - it200.com
通過谷歌地圖API搜索位置是通過 Geocoder 類來完成的。愛掏網(wǎng) - it200.com Geocoder類用于處理 地理編碼 和 逆地理編碼 。愛掏網(wǎng) - it200.com
地理編碼是將街道地址轉(zhuǎn)換為坐標(biāo)（緯度，經(jīng)度）的過程。愛掏網(wǎng) - it200.com逆地理編碼是將坐標(biāo)（緯度，經(jīng)度）轉(zhuǎn)換為地址的過程。愛掏網(wǎng) - it200.com
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List <Address> getFromLocation(double latitude, double longitude, int maxResults): ** 此方法返回一個(gè)指定周圍緯度和經(jīng)度的Address數(shù)組。愛掏網(wǎng) - it200.com - **
List <Address> getFromLocationName(String location, int results, double leftLatitude, double leftLongitude, double rightLatitude, double rightLongitude): ** 此方法返回一個(gè)描述給定位置（如地點(diǎn)、地址等）的Address數(shù)組。愛掏網(wǎng) - it200.com - **
List <Address> getFromLocationName(String location, int results): ** 此方法返回一個(gè)描述給定位置（如地點(diǎn)、地址等）的Address數(shù)組。愛掏網(wǎng) - it200.com static boolean isPresent(): 此方法如果實(shí)現(xiàn)了getFromLocation()和 getFromLocationName()方法，則返回true。愛掏網(wǎng) - it200.com
讓我們來看一下將位置名稱轉(zhuǎn)換為坐標(biāo)的代碼。愛掏網(wǎng) - it200.com
List<Address> addressList = geocoder.getFromLocationName(location, 1);
Address address = addressList.get(0);
LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
例子：Android谷歌地圖API搜索位置
讓我們看一個(gè)搜索輸入位置的谷歌地圖的例子。愛掏網(wǎng) - it200.com
activity_maps.xml
在activity_maps.xml文件中添加一個(gè)片段（SupportMapFragment）、一個(gè)EditText和一個(gè)按鈕。愛掏網(wǎng) - it200.com
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="example.com.mapexample.MapsActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:layout_width="248dp"
android:layout_height="wrap_content"
android:id="@+id/editText"
android:layout_weight="0.5"
android:inputType="textPersonName"
android:hint="Search Location" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:onClick="searchLocation"
android:text="Search" />
</LinearLayout>
</fragment>
build.gradel
在 build.gradel 文件中添加以下依賴項(xiàng)。愛掏網(wǎng) - it200.com
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.google.android.gms:play-services-maps:11.8.0'
compile '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
在MapsActivity.java文件中添加以下代碼。愛掏網(wǎng) - it200.com
package example.com.mapexample;
import android.location.Address;
import android.location.Geocoder;
import android.os.Build;
import android.support.v4.app.FragmentActivity;
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.support.v4.content.ContextCompat;
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;
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();
List<Address> addressList = 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();
}
}
}
在AndroidManifest.xml中需要添加的權(quán)限
在AndroidManifest.xml文件中添加以下用戶權(quán)限。愛掏網(wǎng) - it200.com
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="example.com.mapexample">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
輸出
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