자바로 keyHash 구하는 소스

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

try{
PackageInfo info = getPackageManager().getPackageInfo("본인의 패키지명 쓰시면 됩니다. (예시com.prography.playeasy)",
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 (PackageManager.NameNotFoundException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}


}
}

 

 

 

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카카오 로그인 api 하기위해 개발자 가이드 보고 한거

 

package com.study.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import static com.kakao.util.helper.Utility.getPackageInfo;


public class MainActivity extends AppCompatActivity {

private static final String TAG = "test";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Log.e("getKeyHash", ""+getKeyHash(MainActivity.this));
}

public static String getKeyHash(final Context context) {
PackageInfo packageInfo = getPackageInfo(context, PackageManager.GET_SIGNATURES);
if (packageInfo == null)
return null;

for (Signature signature : packageInfo.signatures) {
try {
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(signature.toByteArray());
return Base64.encodeToString(md.digest(), Base64.NO_WRAP);
} catch (NoSuchAlgorithmException e) {
Log.w(TAG, "Unable to get MessageDigest. signature=" + signature, e);
}
}
return null;
}
}