百度定位SDK实现获取当前经纬度及位置
使用Android自帶的LocationManager和Location獲取位置的時候,經常會有獲取的location為null的情況,并且操作起來也不是很方便,在這個Demo里我使用了百度地圖API中的定位SDK,可以一次性獲取當前位置經緯度以及詳細地址信息,還可以獲取周邊POI信息,同時可以設定位置通知點,當到達某一位置時,發出通知信息等方式來告知用戶。jar包下載以及官方文檔請參照:百度定位SDK,前提是需要注冊百度開發者賬號。
下面來看看定位的基本原理,目前,定位SDK可以通過GPS、基站、Wifi信號進行定位?;径ㄎ涣鞒倘缦聢D所示,當應用程序向定位SDK發起定位請求時,定位SDK會根據當前的GPS、基站、Wifi信息生成相對應的定位依據。然后定位SDK會根據定位依據來進行定位。如果需要,定位SDK會向定位服務器發送網絡請求。定位服務器會根據請求的定位依據推算出對應的坐標位置,然后根據用戶的定制信息,生成定位結果返回給定位SDK。
????????????????????
到官方下載jar文件后添加到工程,工程目錄截圖如下:
注意要把locSDK_2.4.jar添加到當天工程,右鍵jar文件-Build path-Add to。。。
上代碼
布局文件:
[html]?
<?xml version="1.0" encoding="utf-8"?>?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"?
??? android:layout_width="fill_parent"?
??? android:layout_height="fill_parent"?
??? android:orientation="vertical" >?
?
??? <Button?
??????? android:id="@+id/btn_start"?
??????? android:layout_width="fill_parent"?
??????? android:layout_height="wrap_content"??
??????? android:layout_marginTop="20dp"?
??????? android:text="Start"/>?
?
??? <TextView?
??????? android:id="@+id/tv_loc_info"?
??????? android:layout_width="fill_parent"?
??????? android:layout_height="wrap_content"?
??????? android:textSize="18sp" />?
?
</LinearLayout>?
配置文件:
[html]
<?xml version="1.0" encoding="utf-8"?>?
<manifest xmlns:android="http://schemas.android.com/apk/res/android"?
??? package="com.ericssonlabs"?
??? android:versionCode="1"?
??? android:versionName="1.0" >?
?
??? <uses-sdk android:minSdkVersion="8" />?
?
??? <permission android:name="android.permission.BAIDU_LOCATION_SERVICE" >?
??? </permission>?
?
??? <uses-permission android:name="android.permission.BAIDU_LOCATION_SERVICE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.READ_PHONE_STATE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.INTERNET" />?
??? <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >?
??? </uses-permission>?
??? <uses-permission android:name="android.permission.READ_LOGS" >?
??? </uses-permission>?
?
??? <application?
??????? android:icon="@drawable/ic_launcher"?
??????? android:label="@string/app_name" >?
??????? <activity?
??????????? android:name=".LocationDemoActivity"?
??????????? android:label="@string/app_name" >?
??????????? <intent-filter>?
??????????????? <action android:name="android.intent.action.MAIN" />?
?
??????????????? <category android:name="android.intent.category.LAUNCHER" />?
??????????? </intent-filter>?
??????? </activity>?
?
??????? <service?
??????????? android:name="com.baidu.location.f"?
??????????? android:enabled="true"?
??????????? android:permission="android.permission.BAIDU_LOCATION_SERVICE"?
??????????? android:process=":remote" >?
??????????? <intent-filter>?
??????????????? <action android:name="com.baidu.location.service_v2.4" />?
??????????? </intent-filter>?
??????? </service>?
??? </application>?
?
</manifest>?
實現代碼:
[java]
public class LocationDemoActivity extends Activity {?
??? private TextView locationInfoTextView = null;?
??? private Button startButton = null;?
??? private LocationClient locationClient = null;?
??? private static final int UPDATE_TIME = 5000;?
??? private static int LOCATION_COUTNS = 0;?
?????
??? @Override?
??? public void onCreate(Bundle savedInstanceState) {?
??????? super.onCreate(savedInstanceState);?
??????? setContentView(R.layout.main);?
?????????
??????? locationInfoTextView = (TextView) this.findViewById(R.id.tv_loc_info);?
??????? startButton = (Button) this.findViewById(R.id.btn_start);?
?????????
?????????
??????? locationClient = new LocationClient(this);?
??????? //設置定位條件?
??????? LocationClientOption option = new LocationClientOption();?
??????? option.setOpenGps(true);??????????????????????????????? //是否打開GPS?
??????? option.setCoorType("bd09ll");?????????????????????????? //設置返回值的坐標類型。?
??????? option.setPriority(LocationClientOption.NetWorkFirst);? //設置定位優先級?
??????? option.setProdName("LocationDemo");???????????????????? //設置產品線名稱。強烈建議您使用自定義的產品線名稱,方便我們以后為您提供更高效準確的定位服務。?
??????? option.setScanSpan(UPDATE_TIME);??????????????????????? //設置定時定位的時間間隔。單位毫秒?
??????? locationClient.setLocOption(option);?
?????????
??????? //注冊位置監聽器?
??????? locationClient.registerLocationListener(new BDLocationListener() {?
?????????????
??????????? @Override?
??????????? public void onReceiveLocation(BDLocation location) {?
??????????????? // TODO Auto-generated method stub?
??????????????? if (location == null) {?
??????????????????? return;?
??????????????? }?
??????????????? StringBuffer sb = new StringBuffer(256);?
??????????????? sb.append("Time : ");?
??????????????? sb.append(location.getTime());?
??????????????? sb.append("\nError code : ");?
??????????????? sb.append(location.getLocType());?
??????????????? sb.append("\nLatitude : ");?
??????????????? sb.append(location.getLatitude());?
??????????????? sb.append("\nLontitude : ");?
??????????????? sb.append(location.getLongitude());?
??????????????? sb.append("\nRadius : ");?
??????????????? sb.append(location.getRadius());?
??????????????? if (location.getLocType() == BDLocation.TypeGpsLocation){?
??????????????????? sb.append("\nSpeed : ");?
??????????????????? sb.append(location.getSpeed());?
??????????????????? sb.append("\nSatellite : ");?
??????????????????? sb.append(location.getSatelliteNumber());?
??????????????? } else if (location.getLocType() == BDLocation.TypeNetWorkLocation){?
??????????????????? sb.append("\nAddress : ");?
??????????????????? sb.append(location.getAddrStr());?
??????????????? }?
??????????????? LOCATION_COUTNS ++;?
??????????????? sb.append("\n檢查位置更新次數:");?
??????????????? sb.append(String.valueOf(LOCATION_COUTNS));?
??????????????? locationInfoTextView.setText(sb.toString());?
??????????? }?
?????????????
??????????? @Override?
??????????? public void onReceivePoi(BDLocation location) {?
??????????? }?
?????????????
??????? });?
?????????
??????? startButton.setOnClickListener(new OnClickListener() {?
?????????????
??????????? @Override?
??????????? public void onClick(View v) {?
??????????????? if (locationClient == null) {?
??????????????????? return;?
??????????????? }?
??????????????? if (locationClient.isStarted()) {?
??????????????????? startButton.setText("Start");?
??????????????????? locationClient.stop();?
??????????????? }else {?
??????????????????? startButton.setText("Stop");?
??????????????????? locationClient.start();?
??????????????????? /*
???????????????????? *當所設的整數值大于等于1000(ms)時,定位SDK內部使用定時定位模式。
???????????????????? *調用requestLocation( )后,每隔設定的時間,定位SDK就會進行一次定位。
???????????????????? *如果定位SDK根據定位依據發現位置沒有發生變化,就不會發起網絡請求,
???????????????????? *返回上一次定位的結果;如果發現位置改變,就進行網絡請求進行定位,得到新的定位結果。
???????????????????? *定時定位時,調用一次requestLocation,會定時監聽到定位結果。
???????????????????? */?
??????????????????? locationClient.requestLocation();?
??????????????? }?
??????????? }?
??????? });?
?????????
??? }?
?????
??? @Override?
??? protected void onDestroy() {?
??????? super.onDestroy();?
??????? if (locationClient != null && locationClient.isStarted()) {?
??????????? locationClient.stop();?
??????????? locationClient = null;?
??????? }?
??? }?
?????
?????
}?
來看看最后實現效果,點擊Start后進入位置監聽狀態,根據設置的監聽時間間隔進行定位,如果位置有變化則進行位置更新,同時顯示了檢測位置更新的次數,如果開啟了GPS,則獲取到衛星后,進行GPS定位:
設置位置提醒的功能我這里就沒實現了,感興趣的可以參考開發指南
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