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/*
* Copyright (C) 2015 The Android Open Source Project
* Modifications copyright (C) 2016 Niklas Merz
*
* 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 de.niklasmerz.cordova.fingerprint;
import android.annotation.TargetApi;
import android.content.Context;
import android.hardware.fingerprint.FingerprintManager;
import android.os.CancellationSignal;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Small helper class to manage text/icon around fingerprint authentication UI.
*/
@TargetApi(23)
public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallback {
static final long ERROR_TIMEOUT_MILLIS = 1600;
static final long SUCCESS_DELAY_MILLIS = 1300;
private final Context mContext;
private final FingerprintManager mFingerprintManager;
private final ImageView mIcon;
private final TextView mErrorTextView;
private final Callback mCallback;
private CancellationSignal mCancellationSignal;
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 FingerprintManager mFingerPrintManager;
private final Context mContext;
public FingerprintUiHelperBuilder(Context context, FingerprintManager fingerprintManager) {
mFingerPrintManager = fingerprintManager;
mContext = context;
}
public FingerprintUiHelper build(ImageView icon, TextView errorTextView, Callback callback) {
return new FingerprintUiHelper(mContext, mFingerPrintManager, icon, errorTextView,
callback);
}
}
/**
* Constructor for {@link FingerprintUiHelper}. This method is expected to be called from
* only the {@link FingerprintUiHelperBuilder} class.
*/
private FingerprintUiHelper(Context context, FingerprintManager fingerprintManager,
ImageView icon, TextView errorTextView, Callback callback) {
mFingerprintManager = fingerprintManager;
mIcon = icon;
mErrorTextView = errorTextView;
mCallback = callback;
mContext = context;
}
public boolean isFingerprintAuthAvailable() {
return mFingerprintManager.isHardwareDetected()
&& mFingerprintManager.hasEnrolledFingerprints();
}
public void startListening(FingerprintManager.CryptoObject cryptoObject) {
if (!isFingerprintAuthAvailable()) {
return;
}
mCancellationSignal = new CancellationSignal();
mSelfCancelled = false;
mFingerprintManager
.authenticate(cryptoObject, mCancellationSignal, 0 /* flags */, this, null);
int ic_fp_40px_id = mContext.getResources()
.getIdentifier("ic_fp_40px", "drawable", Fingerprint.packageName);
mIcon.setImageResource(ic_fp_40px_id);
}
public void stopListening() {
if (mCancellationSignal != null) {
mSelfCancelled = true;
mCancellationSignal.cancel();
mCancellationSignal = null;
}
}
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
if (!mSelfCancelled) {
showError(errString);
mIcon.postDelayed(new Runnable() {
@Override
public void run() {
mCallback.onError();
}
}, ERROR_TIMEOUT_MILLIS);
}
}
@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
showError(helpString);
}
@Override
public void onAuthenticationFailed() {
int fingerprint_not_recognized_id = mContext.getResources()
.getIdentifier("fingerprint_not_recognized", "string", Fingerprint.packageName);
showError(mIcon.getResources().getString(
fingerprint_not_recognized_id));
}
@Override
public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
int ic_fingerprint_success_id = mContext.getResources()
.getIdentifier("ic_fingerprint_success", "drawable", Fingerprint.packageName);
mIcon.setImageResource(ic_fingerprint_success_id);
int success_color_id = mContext.getResources()
.getIdentifier("success_color", "color", Fingerprint.packageName);
mErrorTextView.setTextColor(
mErrorTextView.getResources().getColor(success_color_id, null));
int fingerprint_success_id = mContext.getResources()
.getIdentifier("fingerprint_success", "string", Fingerprint.packageName);
mErrorTextView.setText(
mErrorTextView.getResources().getString(fingerprint_success_id));
mIcon.postDelayed(new Runnable() {
@Override
public void run() {
mCallback.onAuthenticated();
}
}, SUCCESS_DELAY_MILLIS);
}
private void showError(CharSequence error) {
int ic_fingerprint_error_id = mContext.getResources()
.getIdentifier("ic_fingerprint_error", "drawable", Fingerprint.packageName);
mIcon.setImageResource(ic_fingerprint_error_id);
mErrorTextView.setText(error);
int warning_color_id = mContext.getResources()
.getIdentifier("warning_color", "color", Fingerprint.packageName);
mErrorTextView.setTextColor(
mErrorTextView.getResources().getColor(warning_color_id, null));
mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
mErrorTextView.postDelayed(mResetErrorTextRunnable, ERROR_TIMEOUT_MILLIS);
}
Runnable mResetErrorTextRunnable = new Runnable() {
@Override
public void run() {
int hint_color_id = mContext.getResources()
.getIdentifier("hint_color", "color", Fingerprint.packageName);
mErrorTextView.setTextColor(
mErrorTextView.getResources().getColor(hint_color_id, null));
int fingerprint_hint_id = mContext.getResources()
.getIdentifier("fingerprint_hint", "string", Fingerprint.packageName);
mErrorTextView.setText(
mErrorTextView.getResources().getString(fingerprint_hint_id));
int ic_fp_40px_id = mContext.getResources()
.getIdentifier("ic_fp_40px", "drawable", Fingerprint.packageName);
mIcon.setImageResource(ic_fp_40px_id);
}
};
public interface Callback {
void onAuthenticated();
void onError();
}
}