实现HelloGoogleMaps这个例子比较麻烦了点,下面一步步说说。
1. 按照google文档建立项目,建立项目用的build target要用Google APIs,AVD设备也要用Google APIs,否则程序无法显示入口图标,无法运行等。
2. 如何获得下面的apikey。
android:apiKey="Your Maps API Key goes here"
a>在DOS窗口用如下命令获得MD5:
C:\Program Files\Java\jre7\bin>keytool -v -list -alias androiddebugkey -keystore "C:\Users\t\.android\debug.keystore" -storepass android -keypass android注意: 在jdk7版本以上必须加-v,否则得到是 20位的SHA1的值 ,注册需要的是16位的MD5.别搞错奥!
b> 在 https://developers.google.com/android/maps-api-signup?hl=zh-CN 页面输入上一步得到的MD5, 选中“同意协议”,当然还要有个google帐号,点击生成进入下就一个页面就会显示生成apikey。
如果上述网址无法正常显示,https://developers.google.com/android/maps-api-signup?hl=zh-TW这个可以备用。如果这个还不行,那就自己找“tizi”吧。
如果错误的将SHA1输入,进入页面显示乱码,意思就是你输入的MD5不合法。
c> 将上一步得到的apikey拷贝到main.xml对应的位置:
android:apiKey="0eIPNkAcKF3xgG26zq8HXA4LgvMpSKe2vvs8QJQ"如果你的MD5不是通过keytool工具得来,而是自己编了一个MD5骗google,那么对不起,你的应用仍然无法显示地图,只是白板一块。
如果apikey对了,进入程序,点击放大按钮就会显示地图了。
d>建立类 ItemizedOverlay
。如下代码放到HelloGoogleMaps::onCreate()程序后面就OK,其他基本按照文档就可以。
GeoPoint point = new GeoPoint(19240000,-99120000); OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!");
itemizedoverlay.addOverlay(overlayitem); mapOverlays.add(itemizedoverlay);
3. 附上代码:
main.xml
<?xml version="1.0" encoding="utf-8"?> <com.google.android.maps.MapView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey="0eIPNkAcKF3xgG26zq8HXA4LgvMpSKe2vvs8QJQ" />
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.HelloGoogleMaps" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="15" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".HelloGoogleMaps" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar"> <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> </manifest>
package com.example.HelloGoogleMaps; import java.util.List; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.OverlayItem; import android.graphics.drawable.Drawable; import android.os.Bundle; public class HelloGoogleMaps extends MapActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); MapView mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); List<Overlay> mapOverlays = mapView.getOverlays(); Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker); HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this); GeoPoint point = new GeoPoint(19240000,-99120000); OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!"); GeoPoint point2 = new GeoPoint(35410000, 139460000); OverlayItem overlayitem2 = new OverlayItem(point2, "Sekai, konichiwa!", "I'm in Japan!"); itemizedoverlay.addOverlay(overlayitem2); itemizedoverlay.addOverlay(overlayitem); mapOverlays.add(itemizedoverlay); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } }
package com.example.HelloGoogleMaps; import java.util.ArrayList; import android.app.AlertDialog; import android.content.Context; import android.graphics.drawable.Drawable; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.OverlayItem; public class HelloItemizedOverlay extends ItemizedOverlay { private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); public HelloItemizedOverlay(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); } public HelloItemizedOverlay(Drawable defaultMarker, Context context) { super(boundCenterBottom(defaultMarker)); mContext = context; } @Override protected OverlayItem createItem(int i) { return mOverlays.get(i); } @Override public int size() { return mOverlays.size(); } public void addOverlay(OverlayItem overlay) { mOverlays.add(overlay); populate(); } @Override protected boolean onTap(int index) { OverlayItem item = mOverlays.get(index); AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); dialog.setTitle(item.getTitle()); dialog.setMessage(item.getSnippet()); dialog.show(); return true; } private Context mContext; }