Baidu map positioning: obtains the longitude and latitude of the current location.

Baidu map positioning: obtains the longitude and latitude of the current location.

Note:

1. initialize the BaiduMap SDK before the display interface, that is:

SDKInitializer. initialize (Context );

SetContentView (R. layout. main );

2. When the location mode is set to LocationMode. Hight_Accuracy, you may not be able to obtain accurate latitude and longitude in the room. The default value is 4.9E-324.

The solution is to change the mode to Battery_Saving, or to the outdoor

3. You can set the location mode based on the network connection status of the current device and whether GPS is enabled.

// Obtain network connection information

ConnectivityManager cManager = (ConnectivityManager) getSystemService (Context. CONNECTIVITY_SERVICE );

NetworkInfo info = cManager. getActiveNetworkInfo ();

// Obtain the GPS connection information
LocationManager lManager = (LocationManager) getSystemService (Context. LOCATION_SERVICE );
If (lManager. isProviderEnabled (LocationManager. GPS_PROVIDER )){
Toast. makeText (this, "GPS enabled", 0). show ();
}

 

4. Use latitude and longitude to operate in the public void oncancelocation (BDLocation loc) {} Method

 

Step 1: Import Baidu positioning SDK package

 

Part 2: add access permissions and services to the AndroidManifest. xml configuration file. The Code is as follows:

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <manifest xmlns: android = "http://schemas.android.com/apk/res/android" 3 package = "com. qf. location "4 android: versionCode =" 1 "5 android: versionName =" 1.0 "> 6 7 <uses-sdk 8 android: minSdkVersion =" 8 "9 android: targetSdkVersion = "18"/> 10 11 <! -- Added content 1 (access permission) --> 12 <uses-permission android: name = "android. permission. GET_ACCOUNTS "/> 13 <uses-permission android: name =" android. permission. USE_CREDENTIALS "/> 14 <uses-permission android: name =" android. permission. MANAGE_ACCOUNTS "/> 15 <uses-permission android: name =" android. permission. AUTHENTICATE_ACCOUNTS "/> 16 <uses-permission android: name =" android. permission. ACCESS_NETWORK_STATE "/> 17 <uses-per Mission android: name = "android. permission. INTERNET "/> 18 <uses-permission android: name =" com. android. launcher. permission. READ_SETTINGS "/> 19 <uses-permission android: name =" android. permission. CHANGE_WIFI_STATE "/> 20 <uses-permission android: name =" android. permission. ACCESS_WIFI_STATE "/> 21 <uses-permission android: name =" android. permission. READ_PHONE_STATE "/> 22 <uses-permission android: name =" android. p Ermission. WRITE_EXTERNAL_STORAGE "/> 23 <uses-permission android: name =" android. permission. BROADCAST_STICKY "/> 24 <uses-permission android: name =" android. permission. WRITE_SETTINGS "/> 25 <uses-permission android: name =" android. permission. READ_PHONE_STATE "/> 26 <! -- This permission is used for network positioning --> 27 <uses-permission android: name = "android. permission. ACCESS_COARSE_LOCATION"> 28 </uses-permission> 29 <! -- This permission is used to access GPS positioning --> 30 <uses-permission android: name = "android. permission. ACCESS_FINE_LOCATION"> 31 </uses-permission> 32 <! -- Used to access Wi-Fi network information. wifi information is used to locate the network --> 33 <uses-permission android: name = "android. permission. ACCESS_WIFI_STATE "> 34 </uses-permission> 35 <! -- Obtains carrier information to support interfaces related to carrier information --> 36 <uses-permission android: name = "android. permission. ACCESS_NETWORK_STATE "> 37 </uses-permission> 38 <! -- This permission is used to obtain the permission for wifi, And wifi information is used to locate the network --> 39 <uses-permission android: name = "android. permission. CHANGE_WIFI_STATE "> 40 </uses-permission> 41 <! -- Used to read the current status of the mobile phone --> 42 <uses-permission android: name = "android. permission. READ_PHONE_STATE"> 43 </uses-permission> 44 <! -- Write extended storage and write data to the expansion card for writing offline positioning data --> 45 <uses-permission android: name = "android. permission. WRITE_EXTERNAL_STORAGE "> 46 </uses-permission> 47 <! -- Access the network and access the INTERNET for Network Positioning --> 48 <uses-permission android: name = "android. permission. INTERNET"/> 49 <! -- SD card read permission, users write offline positioning data --> 50 <uses-permission android: name = "android. permission. MOUNT_UNMOUNT_FILESYSTEMS"> 51 </uses-permission> 52 <! -- Allow applications to read low-level system log files --> 53 <uses-permission android: name = "android. permission. READ_LOGS "> 54 </uses-permission> 55 56 <application57 android: allowBackup =" true "58 android: icon =" @ drawable/ic_launcher "59 android: label = "@ string/app_name" 60 android: theme = "@ style/AppTheme"> 61 <activity62 android: name = "com. qf. location. mainActivity "63 android: label =" @ string/app_name "> 64 <intent-filter> 65 <action android: nam E = "android. intent. action. MAIN "/> 66 67 <category android: name =" android. intent. category. LAUNCHER "/> 68 </intent-filter> 69 </activity> 70 71 <! -- Added content 2 --> 72 <meta-data73 android: name = "com. baidu. lbsapi. API_KEY "74 android: value =" Dt7Q30nVQMKbM3NT6GHnRnGq "/> 75 76 <service77 android: name =" com. baidu. location. f "78 android: enabled =" true "79 android: process =": remote "> 80 </service> 81 </application> 82 83 </manifest>View Code

Step 3: Apply for a Baidu map development key: set the value attribute of the <meta_data> label displayed in the previous step.

Step 4: write the code to get the longitude and latitude of the current location: the code is as follows:

1 private LocationClient locClient; 2 3 @ Override 4 protected void onCreate (Bundle savedInstanceState) {5 super. onCreate (savedInstanceState); 6 7 // initialize BaiduMap SDK 8 SDKInitializer before the display interface. initialize (getApplicationContext (); 9 setContentView (R. layout. activity_main); 10 11 12 getLocation (); 13} 14 15 16 // obtain the longitude and latitude 17 public void getLocation () of the current mobile phone location () {18 // instantiate location client 19 locClient = new LocationClient (getApplicationContext (); 20 // create a Location option object 21 LocationClientOption locOption = new LocationClientOption (); 22 23 // set the option attribute 24 locOption. setCoorType ("bd09II"); // bd09II indicates that the returned result is Baidu's latitude and longitude 25 locOption. setIsNeedAddress (true); // The returned information contains the current address 26 locOption. setNeedDeviceDirect (true); // The returned content contains 27 locOption directions of the phone head. setScanSpan (5000); // initiates a location request 28 locOption every 5 seconds. setLocationMode (LocationMode. hight_Accuracy); // high precision mode, network and GPS29 30 31 // set the encapsulated parameters to the location client 32 locClient. setLocOption (locOption); 33 34 // register a location listener for the location client 35 locClient. registerLocationListener (new BDLocationListener () {36 37 @ Override38 public void onReceiveLocation (BDLocation loc) {39 double latitude = loc. getLatitude (); 40 double longpolling = loc. getlongpolling (); 41 Toast. makeText (getApplicationContext (), latitude + ":" + longpolling, 0 ). show (); 42 43/* ========================================== the interface defined here = ================================= */44 45} 46 }); 47 48 // start position client 49 locClient. start (); 50 51}View Code