首先有一个与fb-sdk android-support-v4.jar相同的.jar文件。 然后使用以下命令生成SHA1密钥:

PackageInfo info;
try {

    info = getPackageManager().getPackageInfo(
        "com.example.worldmission", PackageManager.GET_SIGNATURES);

    for (Signature signature : info.signatures) {
        MessageDigest md;
        md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        String something = new String(Base64.encode(md.digest(), 0));
        Log.e("Hash key", something);
        System.out.println("Hash key" + something);
    }

} catch (NameNotFoundException e1) {
    Log.e("name not found", e1.toString());
} catch (NoSuchAlgorithmException e) {
    Log.e("no such an algorithm", e.toString());
} catch (Exception e) {
    Log.e("exception", e.toString());
}

首先有一个与fb-sdk android-support-v4.jar相同的.jar文件。 然后使用以下命令生成SHA1密钥:

PackageInfo info;
try {

    info = getPackageManager().getPackageInfo(
        "com.example.worldmission", PackageManager.GET_SIGNATURES);

    for (Signature signature : info.signatures) {
        MessageDigest md;
        md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        String something = new String(Base64.encode(md.digest(), 0));
        Log.e("Hash key", something);
        System.out.println("Hash key" + something);
    }

} catch (NameNotFoundException e1) {
    Log.e("name not found", e1.toString());
} catch (NoSuchAlgorithmException e) {
    Log.e("no such an algorithm", e.toString());
} catch (Exception e) {
    Log.e("exception", e.toString());
}

右边Gradle—>签名项目获得所有密钥

如果您正在使用谷歌Play应用程序签名，而不是从密钥库中获取SHA，更简单的方法是到谷歌Play控制台>您的应用程序> Release Management >应用程序签名并寻找您的上传证书。

跟随本教程为谷歌Map v2创建SHA1指纹

调试模式:

keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android 

释放模式:

keytool -list -v -keystore {keystore_name} -alias {alias_name}

例子:

keytool -list -v -keystore C:\Users\MG\Desktop\test.jks -alias test

在windows下，当keytool命令找不到时，转到您安装的JDK目录，例如<YourJDKPath>\Java\jdk1.8.0_231\bin\，打开命令行，尝试上述命令进行调试/发布模式。

获得SHA1或SHA-256的另一种方式使用./gradlew signingReport

欲了解更多详细信息，请访问 使用Gradle的签名报告

[![更改构建变量，然后您可以看到应用程序的运行，这将导致错误

你必须找到释放密钥的SHA1代码，并在开发人员控制台输入它。(对我来说，开发人员控制台是firebase，有些人可能使用不同的服务)找到SHA1代码。简单的方法是

Go to Build --- Select Build Variant -- On the left Side Select "Release" as build variant -- now go to module settings ( or try to run project , android studio will tell you about a error and click fix error button) --- Select Signing tab --- add your release key and passwords -- now goto build types -- select release -- on signing config select your release key config -- now run your project -- now run your signing report --- you can find SHA1 under release build -- enter that sha1 code on your developer console