2 * Copyright (C) 2015 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
17 package com.android.settings.fingerprint;
19 import android.hardware.fingerprint.FingerprintManager;
20 import android.os.CancellationSignal;
21 import android.view.View;
22 import android.widget.ImageView;
23 import android.widget.TextView;
25 import com.android.settings.R;
26 import com.android.settings.Utils;
29 * Small helper class to manage text/icon around fingerprint authentication UI.
31 public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallback {
33 private static final long ERROR_TIMEOUT = 1300;
35 private ImageView mIcon;
36 private TextView mErrorTextView;
37 private CancellationSignal mCancellationSignal;
40 private Callback mCallback;
41 private FingerprintManager mFingerprintManager;
43 public FingerprintUiHelper(ImageView icon, TextView errorTextView, Callback callback,
45 mFingerprintManager = Utils.getFingerprintManagerOrNull(icon.getContext());
47 mErrorTextView = errorTextView;
52 public void startListening() {
53 if (mFingerprintManager != null && mFingerprintManager.isHardwareDetected()
54 && mFingerprintManager.getEnrolledFingerprints(mUserId).size() > 0) {
55 mCancellationSignal = new CancellationSignal();
56 mFingerprintManager.setActiveUser(mUserId);
57 mFingerprintManager.authenticate(
58 null, mCancellationSignal, 0 /* flags */, this, null, mUserId);
59 setFingerprintIconVisibility(true);
60 mIcon.setImageResource(R.drawable.ic_fingerprint);
64 public void stopListening() {
65 if (mCancellationSignal != null) {
66 mCancellationSignal.cancel();
67 mCancellationSignal = null;
71 public boolean isListening() {
72 return mCancellationSignal != null && !mCancellationSignal.isCanceled();
75 private void setFingerprintIconVisibility(boolean visible) {
76 mIcon.setVisibility(visible ? View.VISIBLE : View.GONE);
77 mCallback.onFingerprintIconVisibilityChanged(visible);
81 public void onAuthenticationError(int errMsgId, CharSequence errString) {
83 setFingerprintIconVisibility(false);
87 public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
88 showError(helpString);
92 public void onAuthenticationFailed() {
93 showError(mIcon.getResources().getString(
94 R.string.fingerprint_not_recognized));
98 public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
99 mIcon.setImageResource(R.drawable.ic_fingerprint_success);
100 mCallback.onAuthenticated();
103 private void showError(CharSequence error) {
104 if (!isListening()) {
108 mIcon.setImageResource(R.drawable.ic_fingerprint_error);
109 mErrorTextView.setText(error);
110 mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
111 mErrorTextView.postDelayed(mResetErrorTextRunnable, ERROR_TIMEOUT);
114 private Runnable mResetErrorTextRunnable = new Runnable() {
117 mErrorTextView.setText("");
118 mIcon.setImageResource(R.drawable.ic_fingerprint);
122 public interface Callback {
123 void onAuthenticated();
124 void onFingerprintIconVisibilityChanged(boolean visible);