Android Location的使用

 

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

分类： Android高手进阶2010-06-15 22:00 12886人阅读 评论(26) 收藏 举报

androidlayoutencodingapplicationserviceaction

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:

[java] view plaincopy

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7. <TextView   
8.     android:id="@+id/longitude"   
9.     android:layout_width="fill_parent"   
10.     android:layout_height="wrap_content"   
11.     android:text="longitude:"  
12.     />  
13. <TextView  
14.     android:id="@+id/latitude"    
15.     android:layout_width="fill_parent"   
16.     android:layout_height="wrap_content"   
17.     android:text="latitude:"  
18.     />  
19. </LinearLayout>  

第三步:修改LocationDemo.java ，代码如下:

[java] view plaincopy

1. package com.android.tutor;  
2. import android.app.Activity;  
3. import android.content.Context;  
4. import android.location.Location;  
5. import android.location.LocationManager;  
6. import android.os.Bundle;  
7. import android.widget.TextView;  
8. public class LocationDemo extends Activity {  
9.      
10.     private TextView longitude;  
11.     private TextView latitude;  
12.     @Override  
13.     public void onCreate(Bundle savedInstanceState) {  
14.         super.onCreate(savedInstanceState);  
15.         setContentView(R.layout.main);  
16.           
17.         longitude = (TextView)findViewById(R.id.longitude);  
18.         latitude = (TextView)findViewById(R.id.latitude);  
19.           
20.         Location mLocation = getLocation(this);  
21.           
22.         longitude.setText("Longitude: " + mLocation.getLongitude());  
23.         latitude.setText("Latitude: " + mLocation.getLatitude());  
24.     }  
25.       
26.     //Get the Location by GPS or WIFI  
27.     public Location getLocation(Context context) {  
28.         LocationManager locMan = (LocationManager) context  
29.                 .getSystemService(Context.LOCATION_SERVICE);  
30.         Location location = locMan  
31.                 .getLastKnownLocation(LocationManager.GPS_PROVIDER);  
32.         if (location == null) {  
33.             location = locMan  
34.                     .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);  
35.         }  
36.         return location;  
37.     }  
38. }  

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

[java] view plaincopy

1. <?xml version="1.0" encoding="utf-8"?>  
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
3.       package="com.android.tutor"  
4.       android:versionCode="1"  
5.       android:versionName="1.0">  
6.     <application android:icon="@drawable/icon" android:label="@string/app_name">  
7.         <activity android:name=".LocationDemo"  
8.                   android:label="@string/app_name">  
9.             <intent-filter>  
10.                 <action android:name="android.intent.action.MAIN" />  
11.                 <category android:name="android.intent.category.LAUNCHER" />  
12.             </intent-filter>  
13.         </activity>  
14.     </application>  
15.     <uses-sdk android:minSdkVersion="7" />  
16.     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>  
17. </manifest>   

第五步:运行LocationDemo 工程，所得效果如下(真机深圳测试):

WIFI BroadcastReceiver Detect

24down vote

You can register a BroadcastReceiver to be notified when a WiFi connection is established (or if the connection changed). Register the BroadcastReceiver: IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION); registerReceiver(broadcastReceiver, intentFilter); And then in your BroadcastReceiver do something like this: @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) { if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)) { //do stuff } else { // wifi connection was lost } } For more info, see the documentation for BroadcastReceiver and WifiManager Of course you should check whether the device is already connected to WiFi before this. --------------------------------------------------------------------------------------------------------------- IntentFilter filter = new IntentFilter(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);        br r = new br();        registerReceiver(r,filter); ======================================================================= @Override public void onReceive(Context context, Intent intent) {     final String action = intent.getAction();     if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {         if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)) {             //do stuff         Toast.makeText(context, "wifi on",Toast.LENGTH_SHORT).show();         } else {             // wifi connection was lost         Toast.makeText(context, "wifi off",Toast.LENGTH_SHORT).show();         }     } }