FingerprintUiHelper

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.example.uz_system_1.lockscreen;

import android.support.v4.hardware.fingerprint.FingerprintManagerCompat;
import android.support.v4.hardware.fingerprint.FingerprintManagerCompat.AuthenticationCallback;
import android.support.v4.hardware.fingerprint.FingerprintManagerCompat.AuthenticationResult;
import android.support.v4.hardware.fingerprint.FingerprintManagerCompat.CryptoObject;
import android.support.v4.os.CancellationSignal;
import android.util.Log;

import com.google.common.annotations.VisibleForTesting;

import javax.inject.Inject;

/**
 * Small helper class to manage text/icon around fingerprint authentication UI.
 */
public class FingerprintUiHelper extends AuthenticationCallback {

    @VisibleForTesting
    static final long ERROR_TIMEOUT_MILLIS = 1600;
    @VisibleForTesting
    static final long SUCCESS_DELAY_MILLIS = 1300;

    private final FingerprintManagerCompat mFingerprintManager;

    private final Callback mCallback;
    private CancellationSignal mCancellationSignal;

    @VisibleForTesting
    boolean mSelfCancelled;

    /**
     * Builder class for {@link FingerprintUiHelper} in which injected fields from Dagger
     * holds its fields and takes other arguments in the {@link #build} method.
     */
    public static class FingerprintUiHelperBuilder {
        private  final FingerprintManagerCompat mFingerPrintManager;

        @Inject
        public FingerprintUiHelperBuilder(FingerprintManagerCompat fingerprintManager) {
            mFingerPrintManager = fingerprintManager;
        }


        public FingerprintUiHelper build(Callback callback) {
            return new FingerprintUiHelper(mFingerPrintManager,
                    callback);
        }
    }

    /**
     * Constructor for {@link FingerprintUiHelper}. This method is expected to be called from
     * only the {@link FingerprintUiHelperBuilder} class.
     */
    private FingerprintUiHelper(FingerprintManagerCompat fingerprintManager,
                                Callback callback) {
        mFingerprintManager = fingerprintManager;
        mCallback = callback;
    }

    public boolean isFingerprintAuthAvailable() {
        return mFingerprintManager.isHardwareDetected()
                && mFingerprintManager.hasEnrolledFingerprints();
    }

    public void startListening(CryptoObject cryptoObject) {
        if (!isFingerprintAuthAvailable()) {
            return;
        }
        mCancellationSignal = new CancellationSignal();
        mSelfCancelled = false;
        mFingerprintManager
                .authenticate(cryptoObject, 0 /* flags */, mCancellationSignal, this, null);

    }

    public void stopListening() {
        if (mCancellationSignal != null) {
            mSelfCancelled = true;
            mCancellationSignal.cancel();
            mCancellationSignal = null;
        }
    }

    @Override
    public void onAuthenticationError(int errMsgId, CharSequence errString) {
        if (!mSelfCancelled) {
            showError(errString);
            mCallback.onError();
        }
    }

    @Override
    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
        showError(helpString);
    }

    @Override
    public void onAuthenticationFailed() {
        Log.i("adsa","dsa");
    }

    @Override
    public void onAuthenticationSucceeded(AuthenticationResult result) {
        mCallback.onAuthenticated();
    }

    private void showError(CharSequence error) {
    }


    public interface Callback {

        void onAuthenticated();

        void onError();
    }
}