三十、Google Map导航应用

一、main.xml布局，内容如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        <EditText android:id="@+id/etFrom"
            android:layout_width="130px" 
            android:layout_height="wrap_content"
            android:text="@string/etFrom"/>
        <TextView android:gravity="center_horizontal"
            android:layout_width="55px" 
            android:layout_height="wrap_content"
            android:text="@string/to"/>
        <EditText android:id="@+id/etTo"
            android:layout_width="130px" 
            android:layout_height="wrap_content"
            android:text="@string/etTo"/>
    </LinearLayout>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal" 
        android:gravity="center_horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        <Button android:id="@+id/btnFrom"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btnFrom"/>
        <Button android:id="@+id/btnTo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:text="@string/btnTo"/>
        <Button android:id="@+id/btnSearch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:text="@string/btnSearch"/>
    </LinearLayout>
    <com.google.android.maps.MapView android:id="@+id/mapView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:clickable="true"
        android:apiKey="0ZUHwocAEeJEiMatLbTddLH_rS92w_CsVyGuNKQ"/>
</LinearLayout>

二、string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, GoogleMapActivity!</string>
    <string name="app_name">谷歌地图应用</string>
    <string name="btnSearch">查询路径</string>
    <string name="to">到</string>
    <string name="etFrom">东街口</string>
    <string name="etTo">国货西路</string>
    <string name="btnFrom">显示起点</string>
    <string name="btnTo">显示终点</string>
</resources>

三、类GoogleMapActivity

package com.ljq.activity;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.net.Uri;
import android.os.Bundle;
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.MapController;
import com.google.android.maps.MapView;

public class GoogleMapActivity extends MapActivity {
    private EditText etFrom; //起始地点
    private EditText etTo; //终止地点
    private Button btnSearch; //路线查询
    private Button btnFrom; //显示起始地点按钮
    private Button btnTo;//显示终止地点按钮
    private MapView mapView;
    private MapController mapController;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //初始化
        etFrom=(EditText)findViewById(R.id.etFrom);
        etTo=(EditText)findViewById(R.id.etTo);
        btnSearch=(Button)findViewById(R.id.btnSearch);
        btnFrom=(Button)findViewById(R.id.btnFrom);
        btnTo=(Button)findViewById(R.id.btnTo);
        mapView=(MapView)findViewById(R.id.mapView);
        mapController=mapView.getController();
        
        mapController.setZoom(15);
        btnSearch.setOnClickListener(listener);
        btnFrom.setOnClickListener(listener);
        btnTo.setOnClickListener(listener);
    }
 
    
    private OnClickListener listener=new OnClickListener() {
    
        public void onClick(View v) {
            String etFrom=GoogleMapActivity.this.etFrom.getText().toString();
            String etTo=GoogleMapActivity.this.etTo.getText().toString();
            if(v==btnSearch){
               GeoPoint formGeoPoint = getGeoPointByAddress(etFrom);
               GeoPoint toGeoPoint = getGeoPointByAddress(etTo);
               
               Intent intent=new Intent();
               intent.setAction(android.content.Intent.ACTION_VIEW);
               intent.setData(Uri.parse(
                   "http://maps.google.com/maps?f=d&saddr="
                   + geoPointToString(formGeoPoint) +"&daddr="
                   +geoPointToString(toGeoPoint)+"&h1=cn"));
               startActivity(intent);
            }else if(v==btnFrom){
               //得到起始点的GeoPoint
               GeoPoint formGeoPoint = getGeoPointByAddress(etFrom);
               if(formGeoPoint != null){
                   //显示到formGeoPoint点
                   GoogleMapActivity.this.mapController.animateTo(formGeoPoint);
                }
            }else if(v==btnTo){
               //得到起始点的GeoPoint
               GeoPoint toGeoPoint = getGeoPointByAddress(etTo);
               if(toGeoPoint != null){
                   //显示到formGeoPoint点
                   GoogleMapActivity.this.mapController.animateTo(toGeoPoint);
                }
           }
            
        }
    
    };

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
    
    /**
     * 将经纬度转换为字符串
     * 
     * @return
     */
    private String geoPointToString(GeoPoint geoPoint){
        String result="";
        if(geoPoint!=null){
            double longitude=(int)geoPoint.getLongitudeE6()/1E6;
            double latitude=(int)geoPoint.getLatitudeE6()/1E6;
            result=String.valueOf(latitude)+","+String.valueOf(longitude);
        }
        return result;
    }
    
    /**
     * 通过地址得到GeoPoint
     * 
     * 
     * @param address
     * @return
     */
    private GeoPoint getGeoPointByAddress(String address){
        GeoPoint geoPoint = null;
        if(address != ""){
            //Geocoder类根据地理名称得到address的方法，getFromLocation()与getFromLocationName()
            //Geocoder myGeocoder = new Geocoder(this); //会出现java.io.IOException: Unable to parse response from server异常
            Geocoder myGeocoder = new Geocoder(getBaseContext(), Locale.CHINA);
            List<Address> addressList = null;
            try {
                addressList = myGeocoder.getFromLocationName(address, 1);
                if(!addressList.isEmpty()){
                    //获取第一个Address
                    Address tempAddress = addressList.get(0);
                    double latitude = tempAddress.getLatitude()*1E6;
                    double longitude = tempAddress.getLongitude()*1E6;
                    geoPoint = new GeoPoint((int)latitude, (int)longitude);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return geoPoint;
    }
}

四、清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.ljq.activity"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".GoogleMapActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <uses-library android:name="com.google.android.maps"/>
    </application>
    <uses-sdk android:minSdkVersion="3" />
    <uses-permission android:name="android.permission.INTERNET" /> 

</manifest>

五、运行结果

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