简单的方法

通过使用这个网站，您可以通过将SHA1密钥转换为Facebook的哈希密钥来获得哈希密钥。

在你的应用程序中运行:

FacebookSdk.sdkInitialize(getApplicationContext());
Log.d("AppLog", "key:" + FacebookSdk.getApplicationSignature(this)+"=");

或:

public static void printHashKey(Context context) {
    try {
        final PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
        for (android.content.pm.Signature signature : info.signatures) {
            final MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            final String hashKey = new String(Base64.encode(md.digest(), 0));
            Log.i("AppLog", "key:" + hashKey + "=");
        }
    } catch (Exception e) {
        Log.e("AppLog", "error:", e);
    }
}

然后看看日志。

结果应该以“=”结尾。

解是基于这里和这里。

https://developers.facebook.com/docs/android/getting-started/

4.19.0 - 2017年1月25日

Facebook SDK

修改

Facebook SDK现在在应用程序启动时自动初始化。在大多数情况下，不再需要手动调用FacebookSDK.sdkInitialize()。有关详细信息，请参见升级指南。

为调试

try {
    PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
    }
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
}

    private fun generateKeyHash(): String? {try {
    val info =packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES)
    for (signature in info.signatures) {
        val md: MessageDigest = MessageDigest.getInstance("SHA")
        md.update(signature.toByteArray())
        return String(Base64.encode(md.digest(), 0))
    }
} catch (e: Exception) {
    Log.e("exception", e.toString())
}
    return "key hash not found"
}

你可以用这个apk

1.first install the app from the Google play store
2.install the above apk
3.launch the apk and input the package name of your app
4.then you will get the hash code you want

也有一个简单的解决方案。在你的应用中运行这个:

FacebookSdk.sdkInitialize(getApplicationContext());
Log.d("AppLog", "key:" + FacebookSdk.getApplicationSignature(this));

一个不需要FB SDK(基于这里的解决方案)的较长的例子:

public static void printHashKey(Context context) {
    try {
        final PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
        for (android.content.pm.Signature signature : info.signatures) {
            final MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            final String hashKey = new String(Base64.encode(md.digest(), 0));
            Log.i("AppLog", "key:" + hashKey + "=");
        }
    } catch (Exception e) {
        Log.e("AppLog", "error:", e);
    }
}

结果应该以“=”结尾。