지문 스캐너를 사용하여 사용자를 인증하는 방법

지문 이벤트에 대한 사용자 지정 처리기 클래스를 만듭니다.

import android.content.Context;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.os.CancellationSignal;

public class FingerprintHandler {
    private Context                                     mContext;
    private FingerprintManager                          mFingerprintManager = null;
    private CancellationSignal                          mCancellationSignal;
    private FingerprintManager.AuthenticationCallback   mAuthenticationCallback;
    private OnAuthenticationSucceededListener           mSucceedListener;
    private OnAuthenticationErrorListener               mFailedListener;

    public interface OnAuthenticationSucceededListener {
        void onAuthSucceeded();
    }

    public interface OnAuthenticationErrorListener {
        void onAuthFailed();
    }

    public void setOnAuthenticationSucceededListener (OnAuthenticationSucceededListener listener){
        mSucceedListener = listener;
    }

    public void setOnAuthenticationFailedListener(OnAuthenticationErrorListener listener) {
        mFailedListener = listener;
    }

    public FingerprintHandler(Context context){
        mContext = context;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            mFingerprintManager = context.getSystemService(FingerprintManager.class);
            mCancellationSignal = new CancellationSignal();

            mAuthenticationCallback = new FingerprintManager.AuthenticationCallback() {
                @Override
                public void onAuthenticationError(int errorCode, CharSequence errString) {
                    super.onAuthenticationError(errorCode, errString);
                }

                @Override
                public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
                    super.onAuthenticationHelp(helpCode, helpString);
                }

                @Override
                public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
                    super.onAuthenticationSucceeded(result);
                    if( mSucceedListener != null )
                        mSucceedListener.onAuthSucceeded();
                }

                @Override
                public void onAuthenticationFailed() {
                    super.onAuthenticationFailed();
                    if (mFailedListener != null)
                        mFailedListener.onAuthFailed();
                }
            };
        }
    }

    public void startListening(){
        if (isFingerScannerAvailableAndSet() ) {
            try{
                mFingerprintManager.authenticate(null, mCancellationSignal, 0 /* flags */, mAuthenticationCallback, null);
            } catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    public void stopListening(){
        if ( isFingerScannerAvailableAndSet() ) {
            try {
                mCancellationSignal.cancel();
                mCancellationSignal = null;
            } catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    public boolean isFingerScannerAvailableAndSet(){
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
            return false;
        if( mFingerprintManager == null )
            return false;
        if( !mFingerprintManager.isHardwareDetected() )
            return false;
        if( !mFingerprintManager.hasEnrolledFingerprints())
            return false;

        return true;
    }
}

그런 다음 활동에서

FingerprintHandler.OnAuthenticationSucceededListener, FingerprintHandler.OnAuthenticationErrorListener

지문 매개 변수 생성 :

private FingerprintHandler mFingerprintHandler;

그 후 onCreate 메서드에서이 지문 처리기를 초기화합니다.

mFingerprintHandler = new FingerprintHandler(this);
mFingerprintHandler.setOnAuthenticationSucceededListener(this);
mFingerprintHandler.setOnAuthenticationFailedListener(this);

다음을 사용하여 지문을 사용할 수 있는지 확인하고 활동에 설정할 수 있습니다.

    if( mFingerprintHandler.isFingerScannerAvailableAndSet() ){
        // show image or text or do something 
    }

구현 된 방법으로 지문 응답을 처리 할 수 ​​있습니다.

@Override
public void onAuthSucceeded() {
     //fingerprint auth succeded go to next activity (or do something)
}


@Override
public void onAuthFailed() {
    //fingerpring auth failed, show error toast (or do something)
}

그리고 당신은 준비되었습니다! :) onPause 및 onResume 메서드에서 지문 인식을 중지하고 시작하는 것을 잊지 마십시오.

@Override
public void onResume() {
    super.onResume();
    mFingerprintHandler.startListening();
}

@Override
public void onPause() {
    super.onPause();
    mFingerprintHandler.stopListening();
}

해피 코딩 :)))