<application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name" >

        <meta-data

            android:name="api_key"

            android:value="iRFgdYoBfUP0n4YjVds1fGCD" />

            </application>

假设我们要获取meta-data标签中的value值方法

 // 获取ApiKey

    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) {

            Log.e(TAG, "error " + e.getMessage());

        }

        return apiKey;

    }