android 使用google map API v2 顯示地圖
要利用google 所提供的map api來顯示地圖。
在測試程式之前，有一先準備工作要先完成，可以先參考這個網址： http://www.cnblogs.com/mengdd/archive/2013/01/01/2841390.html
準備好後，就可以寫個測試程式來踹看看。
先建立一個android project，將它命名為googlemaptest。
AndroidManifaset.xml
<?xml version="1.0" encoding= "utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.googlemaptest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion= "14"
android:targetSdkVersion= "14" />
<permission
android:name= "com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel= "signature" />
<uses-feature
android:glEsVersion= "0x00020000"
android:required= "true" />
<uses-permission android:name= "com.example.mapdemo.permission.MAPS_RECEIVE" />
<uses-permission android:name= "com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name= "android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name= "android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name ="android.permission.INTERNET" />
<uses-permission android:name= "android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup= "true"
android:icon= "@drawable/ic_launcher"
android:label= "@string/app_name"
android:theme= "@style/AppTheme" >
<activity
android:name= "com.example.googlemaptest.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 >
<meta-data
android:name= "com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name= "com.google.android.maps.v2.API_KEY"
android:value="yourAPI_KEY" />
</application >
</manifest>
要加入的東西不少
<permission
android:name= "com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel= "signature" />
<uses-feature
android:glEsVersion= "0x00020000"
android:required= "true" />
<uses-permission android:name= "com.example.mapdemo.permission.MAPS_RECEIVE" />
<uses-permission android:name= "com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name= "android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name= "android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name = "android.permission.INTERNET" />
<uses-permission android:name= "android.permission.ACCESS_NETWORK_STATE" />
在application 裡加入
<meta-data
android:name= "com.google.android.gms.version"
android:value ="@integer/google_play_services_version" />
<meta-data
android:name= "com.google.android.maps.v2.API_KEY"
android:value ="yourAPI_KEY" />
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width= "match_parent"
android:layout_height= "match_parent"
tools:context=".MainActivity" >
<RelativeLayout
android:id= "@+id/topbar1"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:background= "#00666666" >
<Button
android:id= "@+id/btn_query"
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:layout_alignParentRight="true"
android:text= "查詢"
android:textSize= "16sp" />
<EditText
android:id= "@+id/et_address"
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toLeftOf= "@+id/btn_query"
android:ems= "10"
android:inputType= "textMultiLine" />
</RelativeLayout >
<fragment
android:id= "@+id/map"
android:layout_width= "match_parent"
android:layout_height= "match_parent"
android:layout_below= "@+id/topbar1"
class= "com.google.android.gms.maps.MapFragment" />
在xml中配置一個輸入地址的文字框，一個查詢按鈕，和一個顯示地圖的map fragment。
MainActivity.java
private EditText et_address ;
private Button btn_query;
private GoogleMap map;
private LocationManager mgr;
private LocationListener mLocationListenerGPS;
private LocationListener mLocationListenerNETWORK;
private final int TIMEOUT_SEC = 20;
private int currentTime = 0;
private Handler handler = new Handler();
private boolean getLocationFlag = false;
private LatLng START = null; // 啟始座標
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout. activity_main);
et_address = (EditText) this.findViewById(R.id. et_address);
// 先打開GPS定位
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map ))
.getMap();
map.setMyLocationEnabled( true);
mgr = (LocationManager) getSystemService(LOCATION_SERVICE );
getGps();
}
public void getGps () {
getLocationFlag = false;
initLocationListener();
startTimeoutMechanism();
if (!mgr.isProviderEnabled(LocationManager. GPS_PROVIDER)) {
Log. d("GpsTools!" , "gps not open!!!" );
Toast. makeText( this, "GPS衛星定位尚未開啟\n請先開啟GPS衛星定位尚未開啟" ,
Toast. LENGTH_LONG).show();
} else {
mgr.requestLocationUpdates(LocationManager. GPS_PROVIDER, 0, 0,
mLocationListenerGPS);
}
NetworkTools networkTools = new NetworkTools();
if (!networkTools.checkInternetConnection( this)) {
Log. d("GpsTools!" , "network not open!!!" );
} else {
mgr.requestLocationUpdates(LocationManager. NETWORK_PROVIDER, 0, 0,
mLocationListenerNETWORK);
}
}
private void stopGps() {
mgr.removeUpdates( mLocationListenerNETWORK);
mgr.removeUpdates( mLocationListenerGPS);
}
private void initLocationListener() {
mLocationListenerGPS = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//設定位置
setLocation(location);
}
@Override
public void onProviderDisabled(String provider) {
Log. d("mLocationListenerGPS" , "onProviderDisabled" );
}
@Override
public void onProviderEnabled(String provider) {
Log. d("mLocationListenerGPS" , "onProviderEnabled" );
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log. d("mLocationListenerGPS" , "onStatusChanged" );
}
};
mLocationListenerNETWORK = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//設定位置
setLocation(location);
}
@Override
public void onProviderDisabled(String provider) {
Log. d("mLocationListenerNETWORK" , "onProviderDisabled" );
}
@Override
public void onProviderEnabled(String provider) {
Log. d("mLocationListenerNETWORK" , "onProviderEnabled" );
}
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
Log. d("mLocationListenerNETWORK" , "onStatusChanged" );
}
};
}
private Runnable timeOutRunnable = new Runnable() {
public void run() {
Log. d("GpsTools" , "" + currentTime );
currentTime++;
if ( currentTime > TIMEOUT_SEC) {
//停止定位
stopGps();
getLocationFlag = true;
}
if (! getLocationFlag) {
// 如為false,表示尚未取得，再試一次
handler.postDelayed( this, 1000);
} else {
}
}
};
private void startTimeoutMechanism() {
handler.postDelayed( timeOutRunnable, 1000);
}
private void setLocation (Location location) {
String addrline = null;
Double longitude = null;
Double latitude = null;
Log. d("GpsTools" , "longitude" + location.getLongitude());
Log. d("GpsTools" , "latitude" + location.getLatitude());
try {
Geocoder gc = new Geocoder(MainActivity. this,
Locale. TRADITIONAL_CHINESE); // 地區:台灣
// 自經緯度取得地址
List<Address> lstAddress = gc.getFromLocation(
location.getLatitude(), location.getLongitude(), 1);
Address address = lstAddress.get(0);
addrline = address.getAddressLine(0);
et_address.setText(addrline); //顯示定位後的地址
longitude = address.getLongitude();
latitude = address.getLatitude();
} catch (Exception e) {
e.printStackTrace();
}
if (addrline != null) {
stopGps();
// 取到位置了,將flag設為true,讓timeout機制不要再跑了
getLocationFlag = true;
START = new LatLng(latitude, longitude);
setMapMarker( "現在位置" );
}
}
private void setMapMarker(String addrStr) {
if ( map != null) {
map.clear();
Marker note1 = map.addMarker( new MarkerOptions().position(START).title(addrStr));
}
// 設定中心點
CameraUpdate center = CameraUpdateFactory.newLatLng(START);
map.moveCamera(center);
map.animateCamera(CameraUpdateFactory. zoomTo(15), 1000, null );
// 也可以用這個方法取代上面設定中心點
// map.moveCamera(CameraUpdateFactory.newLatLngZoom(START, 15));
//
}
加一個class NetworkTools.java
package com.example.googlemaptest;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class NetworkTools {
public boolean checkInternetConnection(Context c){
ConnectivityManager cm=(ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni=cm.getActiveNetworkInfo();
if(ni!=null && ni.isConnected()){
// System.out.println("ni.isConnected() = "+ni.isConnected());
return ni.isConnected();
}else{
// System.out.println("ni.isConnected() = "+ni.isConnected());
return false;
}
}
}
執行測試程式，如果順利的話，應該可以定位到目前位置，在欄位顯示大略地址，並在地圖上顯示節點和抬頭說明。
我們也可以輸入地址來查詢地址： 接著在MainActivity, 也加入一個Method：
private void getLatLngByAddr() {
Geocoder gc = new Geocoder(this, Locale.TRADITIONAL_CHINESE); // 地區:台灣
try {
List<Address> addresses = gc.getFromLocationName(et_address
.getText().toString().trim(), 1);
if (addresses != null && !addresses.isEmpty()) {
double latitude = ((Address) addresses.get(0)).getLatitude();
double longitude = ((Address) addresses.get(0)).getLongitude();
String addrline = ((Address) addresses.get(0))
.getAddressLine(0);
if (addrline != null) {
START = new LatLng(latitude, longitude);
setMapMarker(et_address.getText().toString().trim());
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
在onCreate Method中加入
btn_query = (Button) this.findViewById(R.id. btn_query);
btn_query.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
//getLatLngByAddr();
}
});
執行程式再試試看，應該可以用地址查詢位置了。
