申请Google Map API Key

开发Android应用程序，如果使用到GoogleMaps，须先向Google申请一组经过验证的Android Maps API Key，这组Key可以在多个应用程序中使用。

1，申请Android Maps API Key前，需先从开发环境中取得keystore的MD5编码，然后通过Google网站的签署，便可获得

debug.keystore文件路径可由Eclipse IDE中“Window - Preferences - Android - Build”中找到

$ keytool -list -alias androiddebugkey -keystore /home/cat/.android/debug.keystore -storepass android -keypass android
androiddebugkey, 2012-9-1, PrivateKeyEntry, 
认证指纹 (MD5)： 97:33:40:5E:FD:XX:XX:XX:YY:YY:YY:ZZ:ZZ:ZZ:19:11

Keytool Option	Description
-list	Print an MD5 fingerprint of a certificate.
-keystore <keystore-name>.keystore	The name of the keystore containing the target key.
-storepass <password>	A password for the keystore. As a security precaution, do not include this option in your command line unless you are working at a secure computer. If not supplied, Keytool prompts you to enter the password. In this way, your password is not stored in your shell history.
-alias <alias_name>	The alias for the key for which to generate the MD5 certificate fingerprint.
-keypass <password>	The password for the key. As a security precaution, do not include this option in your command line unless you are working at a secure computer. If not supplied, Keytool prompts you to enter the password. In this way, your password is not stored in your shell history.

如果下次需要再查看这个MD5值，可以通过$ keytool -list -keystore /home/cat/.android/debug.keystore命令，输入keystore密码：android得到

Keystore 类型： JKS
Keystore 提供者： SUN


您的 keystore 包含 1 输入


androiddebugkey, 2012-9-1, PrivateKeyEntry, 
认证指纹 (MD5)： 97:33:40:5E:FD:XX:XX:XX:YY:YY:YY:ZZ:ZZ:ZZ:19:11

2，访问https://developers.google.com/android/maps-api-signup?hl=zh-CN，输入取得的MD5编码，申请Android Maps API Key

 <com.google.android.maps.MapView
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:apiKey="0mP5XXn2YY7wzy_2ZZc4OObP_WCQQX9hPPpLMMQ"
                 />

3，将获得的Android Maps API Key放入工程的layout文件中使用

    <com.google.android.maps.MapView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/map_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/linearLayout2"
        android:apiKey="0mP5XXn2YY7wzy_2ZZc4OObP_WCQQX9hPPpLMMQ"
        android:clickable="true"
        android:enabled="true" >
    </com.google.android.maps.MapView>