Android-百度地图正反向编码功能实现

百度地图的正反向编码功能的实现，代码来自百度地图SDK_Demo，版本3.7.3

package baidumapsdk.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.BitmapDescriptorFactory;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MarkerOptions;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.search.core.SearchResult;
import com.baidu.mapapi.search.geocode.GeoCodeOption;
import com.baidu.mapapi.search.geocode.GeoCodeResult;
import com.baidu.mapapi.search.geocode.GeoCoder;
import com.baidu.mapapi.search.geocode.OnGetGeoCoderResultListener;
import com.baidu.mapapi.search.geocode.ReverseGeoCodeOption;
import com.baidu.mapapi.search.geocode.ReverseGeoCodeResult;

/** * 此demo用来展示如何进行地理编码搜索（用地址检索坐标）、反地理编码搜索（用坐标检索地址） */
public class GeoCoderDemo extends Activity implements
        OnGetGeoCoderResultListener {
    GeoCoder mSearch = null; // 搜索模块，也可去掉地图模块独立使用
    BaiduMap mBaiduMap = null;
    MapView mMapView = null;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_geocoder);

        // 地图初始化
        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();

        // 初始化搜索模块，注册事件监听
        mSearch = GeoCoder.newInstance();
        mSearch.setOnGetGeoCodeResultListener(this);//要记得注册监听
    }

    /** * 发起搜索 * 在点击控件时开始执行 * @param v */
    public void SearchButtonProcess(View v) {
        if (v.getId() == R.id.reversegeocode) {
            EditText lat = (EditText) findViewById(R.id.lat);
            EditText lon = (EditText) findViewById(R.id.lon);
            LatLng ptCenter = new LatLng((Float.valueOf(lat.getText()
                    .toString())), (Float.valueOf(lon.getText().toString())));
            // 反Geo搜索
            mSearch.reverseGeoCode(new ReverseGeoCodeOption()
                    .location(ptCenter));
        } else if (v.getId() == R.id.geocode) {
            EditText editCity = (EditText) findViewById(R.id.city);
            EditText editGeoCodeKey = (EditText) findViewById(R.id.geocodekey);
            // Geo搜索
            mSearch.geocode(new GeoCodeOption().city(
                    editCity.getText().toString()).address(
                    editGeoCodeKey.getText().toString()));
        }
    }

    @Override
    protected void onPause() {
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onResume() {
        mMapView.onResume();
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        mMapView.onDestroy();
        mSearch.destroy();
        super.onDestroy();
    }
    //创建正反向编码功能的监听器，复写其中两个方法
    @Override//正向编码，通过地址获得经纬度
    public void onGetGeoCodeResult(GeoCodeResult result) {
        if (result == null || result.error != SearchResult.ERRORNO.NO_ERROR) {
            Toast.makeText(GeoCoderDemo.this, "抱歉，未能找到结果", Toast.LENGTH_LONG)
                    .show();
            return;
        }
        mBaiduMap.clear();
        mBaiduMap.addOverlay(new MarkerOptions().position(result.getLocation())
                .icon(BitmapDescriptorFactory
                        .fromResource(R.drawable.icon_marka)));
        mBaiduMap.setMapStatus(MapStatusUpdateFactory.newLatLng(result
                .getLocation()));
        String strInfo = String.format("纬度：%f 经度：%f",
                result.getLocation().latitude, result.getLocation().longitude);
        Toast.makeText(GeoCoderDemo.this, strInfo, Toast.LENGTH_LONG).show();
    }

    @Override//反向编码，通过经纬度获得地址
    public void onGetReverseGeoCodeResult(ReverseGeoCodeResult result) {
        if (result == null || result.error != SearchResult.ERRORNO.NO_ERROR) {
            Toast.makeText(GeoCoderDemo.this, "抱歉，未能找到结果", Toast.LENGTH_LONG)
                    .show();
            return;
        }
        mBaiduMap.clear();
        mBaiduMap.addOverlay(new MarkerOptions().position(result.getLocation())
                .icon(BitmapDescriptorFactory
                        .fromResource(R.drawable.icon_marka)));
        mBaiduMap.setMapStatus(MapStatusUpdateFactory.newLatLng(result
                .getLocation()));
        Toast.makeText(GeoCoderDemo.this, result.getAddress(),
                Toast.LENGTH_LONG).show();

    }

}

其界面的xml布局为：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >

    <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <EditText  android:id="@+id/city" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="北京" />

        <EditText  android:id="@+id/geocodekey" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="海淀区上地十街10号" />

        <Button  android:id="@+id/geocode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="SearchButtonProcess" android:text="Geo" />
    </LinearLayout>

    <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" >

        <EditText  android:id="@+id/lat" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="39.904965" />

        <EditText  android:id="@+id/lon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="116.327764" />

        <Button  android:id="@+id/reversegeocode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="SearchButtonProcess" android:text="ReverseGeo" />
    </LinearLayout>

    <com.baidu.mapapi.map.MapView  android:id="@+id/bmapView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" />

</LinearLayout>