Android 高手进阶教程(十四)之----Android Location的使用！！

大家好，今天说说Location , Location 在Android 开发中还是经常用到的，比如 通过经纬度获取天气，根据Location 获取所在地区详细Address （比如Google Map 开发).等。而在Android 中通过LocationManager 来获取Location .通常获取Location 有GPS 获取，WIFI 获取。

我今天做一个简单的小Demo ,来教大家如何获取Location ,从而获取经纬度。下一节将教大家通过Location 来获取Address .

首先第一步:

创建一个Android 工程命名为LocationDemo .

第二步：修改main.xml 代码如下:

<?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:"      />   </LinearLayout>

<?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:" /> </LinearLayout>

第三步:修改LocationDemo.java ，代码如下:

package com.android.tutor;   import android.app.Activity;   import android.content.Context;   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;       @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);                      Location mLocation = getLocation(this);                      longitude.setText("Longitude: " + mLocation.getLongitude());           latitude.setText("Latitude: " + mLocation.getLatitude());       }              //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;       }   }

package com.android.tutor; import android.app.Activity; import android.content.Context; 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; @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); Location mLocation = getLocation(this); longitude.setText("Longitude: " + mLocation.getLongitude()); latitude.setText("Latitude: " + mLocation.getLatitude()); } //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; } }

第四步：增加权限，修改AndroidManifest.xml 代码如下（第16行为所增行）：

<?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>       </application>       <uses-sdk android:minSdkVersion="7" />       <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>   </manifest>

<?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> </application> <uses-sdk android:minSdkVersion="7" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> </manifest>

第五步:运行LocationDemo 工程，所得效果如下(真机深圳测试):