編輯:Android開發實例
大家好,上一節我講了一下如何通過LocationManager來獲取Location,沒有看過上一節的同學,可以點擊如下鏈接返回查看:
Android高手進階教程十四之---Android Location的使用!
我們獲取Location的目的之一肯定是有獲取這個位置的詳細地址,而我們有了Location在來獲取Address就相對簡單多了,因為GoogleApi已經封裝好了方法,我們只需呀通過Location獲取GeoPoint,然後在通過GeoPoint來獲取我們想要的Address.下面是我做的一個簡單的Demo.
第一步新建一個Android工程LocationDemo,注意這裡選用的是(Google APIs),下面是文件目錄結構:
第二步: 修改main.xml(相比第十四節增加了一個address的TextView),代碼如下:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:id="@+id/longitude"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="longitude:"
- />
- <TextView
- android:id="@+id/latitude"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="latitude:"
- />
- <TextView
- android:id="@+id/address"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
第三步:修改LocationDemo.java(增加了兩個方法)代碼如下:
- package com.android.tutor;
- import java.util.List;
- import java.util.Locale;
- import com.google.android.maps.GeoPoint;
- import android.app.Activity;
- import android.content.Context;
- import android.location.Address;
- import android.location.Geocoder;
- import android.location.Location;
- import android.location.LocationManager;
- import android.os.Bundle;
- import android.widget.TextView;
- public class LocationDemo extends Activity {
- private TextView longitude;
- private TextView latitude;
- private TextView address;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- longitude = (TextView)findViewById(R.id.longitude);
- latitude = (TextView)findViewById(R.id.latitude);
- address = (TextView)findViewById(R.id.address);
- Location mLocation = getLocation(this);
- GeoPoint gp = getGeoByLocation(mLocation);
- Address mAddress = getAddressbyGeoPoint(this, gp);
- longitude.setText("Longitude: " + mLocation.getLongitude());
- latitude.setText("Latitude: " + mLocation.getLatitude());
- address.setText("Address: " + mAddress.getCountryName()+"," + mAddress.getLocality());
- }
- //Get the Location by GPS or WIFI
- public Location getLocation(Context context) {
- LocationManager locMan = (LocationManager) context
- .getSystemService(Context.LOCATION_SERVICE);
- Location location = locMan
- .getLastKnownLocation(LocationManager.GPS_PROVIDER);
- if (location == null) {
- location = locMan
- .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
- }
- return location;
- }
- //通過Location獲取GeoPoint
- public GeoPoint getGeoByLocation(Location location) {
- GeoPoint gp = null;
- try {
- if (location != null) {
- double geoLatitude = location.getLatitude() * 1E6;
- double geoLongitude = location.getLongitude() * 1E6;
- gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return gp;
- }
- //通過GeoPoint來獲取Address
- public Address getAddressbyGeoPoint(Context cntext, GeoPoint gp) {
- Address result = null;
- try {
- if (gp != null) {
- Geocoder gc = new Geocoder(cntext, Locale.CHINA);
- double geoLatitude = (int) gp.getLatitudeE6() / 1E6;
- double geoLongitude = (int) gp.getLongitudeE6() / 1E6;
- List<Address> lstAddress = gc.getFromLocation(geoLatitude,
- geoLongitude, 1);
- if (lstAddress.size() > 0) {
- result = lstAddress.get(0);
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return result;
- }
- }
第四步:最重要一步在AndroidManiefest.xml中導入Google Api(第14行代碼)庫,代碼如下:
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="com.android.tutor"
- android:versionCode="1"
- android:versionName="1.0">
- <application android:icon="@drawable/icon" android:label="@string/app_name">
- <activity android:name=".LocationDemo"
- android:label="@string/app_name">
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- <uses-library android:name="com.google.android.maps" />
- </application>
- <uses-sdk android:minSdkVersion="7" />
- <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
- </manifest>
第五步:運行上述工程,效果如下圖如示:
OK,今天就到這裡,如果有什麼不明白的,或者想要源代碼的,請留下問題或者郵箱。Thx~
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