获取AndroidManifest.xml文件中的meta-data

以获取高德地图的key值为例

<meta-data android:name="api_key" android:value="l8o0DhNxmvPDpCxTabVDF3EO" />  

获取代码

public static String getMetaValue(Context context, String metaKey) {
        Bundle metaData = null;
        String apiKey = null;
        if (context == null || metaKey == null) {
            return null;
        }
        try {
            ApplicationInfo ai = context.getPackageManager()
                    .getApplicationInfo(context.getPackageName(),PackageManager.GET_META_DATA);
            if (null != ai) {
                metaData = ai.metaData;
            }
            if (null != metaData) {
                apiKey = metaData.getString(metaKey);
            }
        } catch (NameNotFoundException e) {
        }
        return apiKey;
    }