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
