Question

例如，这里是清单文件中的元数据：

<meta-data
        android:name="AppId"
        android:value="347" />

这是我的代码：

Activity instance = getActivity();
ApplicationInfo appInfo = instance.getPackageManager().getApplicationInfo(instance.getPackageName(), PackageManager.GET_META_DATA);
if (appInfo.metaData != null) 
    result = appInfo.metaData.getString(key);

我发现＆＃34;结果＆＃34;一片空白！为什么？它可以保持＆＃34; AppId＆＃34;作为我的字符串？

Answer 1

尝试这样做。

Activity instance = getActivity();
ApplicationInfo appInfo = instance.getPackageManager().getApplicationInfo(instance.getPackageName(), PackageManager.GET_META_DATA);
            if (appInfo.metaData != null) 
                result = String.valueOf(appInfo.metaData.getInt(key));

Answer 2

你应该注意applicationInfo.metaData是Bundle
也许你可以用我写的这个方法。

@Nullable
public static String getAppMetaData(Context ctx, String key) {
    if (ctx == null || TextUtils.isEmpty(key)) {
        return null;
    }
    String resultData = null;
    try {
        PackageManager packageManager = ctx.getPackageManager();
        if (packageManager != null) {
            ApplicationInfo applicationInfo = packageManager.getApplicationInfo(ctx.getPackageName(), PackageManager.GET_META_DATA);
            if (applicationInfo != null) {
                if (applicationInfo.metaData != null) {
                    resultData = String.valueOf(applicationInfo.metaData.get(key));
                }
            }
        }
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    return resultData;
}

无论值是String还是int

如何从元数据中获取字符串，而不是int

2 个答案: