12 .Android Location的使用

大家好，今天说说Android 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获取所在地区详细地址（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。

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:

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<? 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：

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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14行为所增行）：

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<? 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)：