android 位置包..............
android.location 包提供了一些工具来实现基于位置的服务。主要包括 Geocoder 类和LocationManager服务。首先介绍 Geocoder。
1.使用Android进行地理编码
如果打算使用地图做一些实际的事情,可能必须将地址(或位置)转换为纬度/经度对。此概念称为地理编码,android.location.Geocoder 类提供了此功能。实际上,Geocoder既提供了前向转换,也提供了后向转换--------它可以获取地址并返回经度/纬度,也可以将经度/纬度对转换为一组地址。该类提供了以下方法。
List<Address> getFromLocation(double latitude,double longitude,int maxResults);List<Address> getFromLocationName(String locationName, int maxResults, double lowerLeftLatitude, double lowerLeftLongitue, double upperRightLatitude, double upperRightLongitude);List<Address> getFromLocationName(String locationName, int maxResults)。
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:layout_width="fill_parent" android:layout_alignParentBottom="true" android:layout_height="wrap_content" android:orientation="vertical"><EditTextandroid:id="@+id/location"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="请输入地址..."/><Buttonandroid:id="@+id/geocodeBtn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Find Location" /> </LinearLayout> <com.google.android.maps.MapView android:id="@+id/geoMap" android:clickable="true" android:layout_width="fill_parent" android:layout_height="320px" android:apiKey="0XemFEdFemEDqY3dE3Ko9ELJX12MRLjJGKEJ01g" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="xiaohang.zhimeng" android:versionCode="1" android:versionName="1.0"><uses-sdk android:minSdkVersion="10" /><application android:icon="@drawable/icon" android:label="@string/app_name"><uses-library android:name="com.google.android.maps" /><activity android:name=".MainActivity" 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-permission android:name="android.permission.ACCESS_FINE_LOCATION" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /><uses-permission android:name="android.permission.INTERNET" /></manifest>
package xiaohang.zhimeng;import java.util.List;import com.google.android.maps.GeoPoint;import com.google.android.maps.MapActivity;import com.google.android.maps.MapView;import android.location.Address;import android.location.Geocoder;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends MapActivity {Geocoder geocoder = null;MapView mapView = null;@Overrideprotected boolean isLocationDisplayed() {return false;}@Overrideprotected boolean isRouteDisplayed() {return false;}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);mapView = (MapView) findViewById(R.id.geoMap);mapView.setBuiltInZoomControls(true);// 经度:116.3946533203125// 纬度:39.87601941962116int lat = (int) (39.87601941962116 * 1E6);int lng = (int) (116.3946533203125 * 1E6);GeoPoint pt = new GeoPoint(lat, lng);mapView.getController().setZoom(10);mapView.getController().setCenter(pt);Button geoBtn = (Button) findViewById(R.id.geocodeBtn);geocoder = new Geocoder(this);geoBtn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {try {EditText loc = (EditText) findViewById(R.id.location);String locationName = loc.getText().toString();List<Address> addressList = geocoder.getFromLocationName(locationName, 5);if (addressList != null && addressList.size() > 0) {int lat = (int) (addressList.get(0).getLatitude() * 1E6);int lng = (int) (addressList.get(0).getLongitude() * 1E6);GeoPoint pt = new GeoPoint(lat, lng);mapView.getController().setZoom(15);mapView.getController().setCenter(pt);}} catch (Exception e) {e.printStackTrace();}}});}}
package xiaohang.zhimeng.tool;import java.io.IOException;import java.io.InputStream;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import com.google.android.maps.GeoPoint;public class MapUtility {public static JSONObject getLocationInfo(String address) {HttpGet httpGet = new HttpGet("http://maps.google."+ "com/maps/api/geocode/json?address=" + address+ "ka&sensor=false");HttpClient client = new DefaultHttpClient();HttpResponse response;StringBuilder stringBuilder = new StringBuilder();try {response = client.execute(httpGet);HttpEntity entity = response.getEntity();InputStream stream = entity.getContent();int b;while ((b = stream.read()) != -1) {stringBuilder.append((char) b);}} catch (ClientProtocolException e) {} catch (IOException e) {}JSONObject jsonObject = new JSONObject();try {jsonObject = new JSONObject(stringBuilder.toString());} catch (JSONException e) {e.printStackTrace();}return jsonObject;}// After executing this, another method converts that JSONObject into a// GeoPoint.public static GeoPoint getGeoPoint(JSONObject jsonObject) {Double lon = new Double(0);Double lat = new Double(0);try {lon = ((JSONArray) jsonObject.get("results")).getJSONObject(0).getJSONObject("geometry").getJSONObject("location").getDouble("lng");lat = ((JSONArray) jsonObject.get("results")).getJSONObject(0).getJSONObject("geometry").getJSONObject("location").getDouble("lat");} catch (JSONException e) {e.printStackTrace();}return new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6));}}
package xiaohang.zhimeng;import java.util.List;import org.json.JSONObject;import xiaohang.zhimeng.tools.MapUtility;import android.app.AlertDialog;import android.app.Dialog;import android.app.ProgressDialog;import android.location.Address;import android.location.Geocoder;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import com.google.android.maps.GeoPoint;import com.google.android.maps.MapActivity;import com.google.android.maps.MapView;public class GeocodingDemoActivity extends MapActivity {Geocoder geocoder = null;MapView mapView = null;ProgressDialog progDialog = null;List<Address> addressList = null;@Overrideprotected boolean isLocationDisplayed() {return false;}@Overrideprotected boolean isRouteDisplayed() {return false;}@Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.main);mapView = (MapView) findViewById(R.id.geoMap);mapView.setBuiltInZoomControls(true);// 北京经纬度// 经度:116.3946533203125// 纬度:39.87601941962116int lat = (int) (39.87601941962116 * 1000000);int lng = (int) (116.3946533203125 * 1000000);GeoPoint pt = new GeoPoint(lat, lng);mapView.getController().setZoom(10);mapView.getController().setCenter(pt);Button geoBtn = (Button) findViewById(R.id.geocodeBtn);geoBtn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {EditText loc = (EditText) findViewById(R.id.location);String locationName = loc.getText().toString();progDialog = ProgressDialog.show(GeocodingDemoActivity.this,"Processing.....", "Finding Location", true, false);findLocation(locationName);}});}private void findLocation(final String locationName) {Thread thrd = new Thread() {@Overridepublic void run() {System.out.println("线程Name是:"+ Thread.currentThread().getName());try {// do backgrond workJSONObject jo = MapUtility.getLocationInfo(locationName);GeoPoint gp = MapUtility.getGeoPoint(jo);Message message = uiCallback.obtainMessage();message.obj = gp;message.sendToTarget();} catch (Exception e) {e.printStackTrace();}}};thrd.start();}// ui thread callback handlerprivate Handler uiCallback = new Handler() {public void handleMessage(android.os.Message msg) {System.out.println("线程Name是:" + Thread.currentThread().getName());progDialog.dismiss();GeoPoint pt = (GeoPoint) msg.obj;if (pt != null) {mapView.getController().setZoom(15);mapView.getController().setCenter(pt);} else {Dialog foundNothingDlg = new AlertDialog.Builder(GeocodingDemoActivity.this).setIcon(0).setTitle("Failed to Find Location").setPositiveButton("OK", null).setMessage("Location Not Found").create();foundNothingDlg.show();}};};}