com.nyelito.fingerprintcam.FingerprintUiHelper.java Source code

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Here is the source code for com.nyelito.fingerprintcam.FingerprintUiHelper.java

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/*
 * 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.nyelito.fingerprintcam;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.CancellationSignal;
import android.support.v4.content.ContextCompat;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.android.camera2basic.R;

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

    static final long ERROR_TIMEOUT_MILLIS = 100;
    static final long SUCCESS_DELAY_MILLIS = 100;

    private final FingerprintManager mFingerprintManager;
    private final Callback mCallback;
    private CancellationSignal mCancellationSignal;

    boolean mSelfCancelled;

    public FingerprintUiHelper(FingerprintManager fingerprintManager, Callback callback) {
        mFingerprintManager = fingerprintManager;
        mCallback = callback;
    }

    public boolean isFingerprintAuthAvailable(Context context) {
        if (ContextCompat.checkSelfPermission(context,
                Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
        }
        return mFingerprintManager.isHardwareDetected() && mFingerprintManager.hasEnrolledFingerprints();
    }

    public void startListening(Context context, FingerprintManager.CryptoObject cryptoObject) {
        if (!isFingerprintAuthAvailable(context)) {
            return;
        }
        mCancellationSignal = new CancellationSignal();
        mSelfCancelled = false;
        if (ContextCompat.checkSelfPermission(context,
                Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    public void requestPermissions(@NonNull String[] permissions, int requestCode)
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for Activity#requestPermissions for more details.
            return;
        }
        mFingerprintManager.authenticate(cryptoObject, mCancellationSignal, 0 /* flags */, this, null);
        //        mIcon.setImageResource(R.drawable.ic_fp_40px);
    }

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

    @Override
    public void onAuthenticationError(int errMsgId, CharSequence errString) {
    }

    @Override
    public void onAuthenticationFailed() {
        if (!mSelfCancelled) {
            mCallback.onError();
        }
    }

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

    public interface Callback {

        void onAuthenticated();

        void onError();
    }
}