1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
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
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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
15 */
16
17package com.android.settings.fingerprint;
18
19import android.hardware.fingerprint.FingerprintManager;
20import android.os.CancellationSignal;
21import android.view.View;
22import android.widget.ImageView;
23import android.widget.TextView;
24
25import com.android.settings.R;
26
27/**
28 * Small helper class to manage text/icon around fingerprint authentication UI.
29 */
30public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallback {
31
32    private static final long ERROR_TIMEOUT = 1300;
33
34    private ImageView mIcon;
35    private TextView mErrorTextView;
36    private CancellationSignal mCancellationSignal;
37    private int mUserId;
38
39    private Callback mCallback;
40    private FingerprintManager mFingerprintManager;
41
42    public FingerprintUiHelper(ImageView icon, TextView errorTextView, Callback callback,
43            int userId) {
44        mFingerprintManager = icon.getContext().getSystemService(FingerprintManager.class);
45        mIcon = icon;
46        mErrorTextView = errorTextView;
47        mCallback = callback;
48        mUserId = userId;
49    }
50
51    public void startListening() {
52        if (mFingerprintManager != null && mFingerprintManager.isHardwareDetected()
53                && mFingerprintManager.getEnrolledFingerprints(mUserId).size() > 0) {
54            mCancellationSignal = new CancellationSignal();
55            mFingerprintManager.setActiveUser(mUserId);
56            mFingerprintManager.authenticate(
57                    null, mCancellationSignal, 0 /* flags */, this, null, mUserId);
58            setFingerprintIconVisibility(true);
59            mIcon.setImageResource(R.drawable.ic_fingerprint);
60        }
61    }
62
63    public void stopListening() {
64        if (mCancellationSignal != null) {
65            mCancellationSignal.cancel();
66            mCancellationSignal = null;
67        }
68    }
69
70    public boolean isListening() {
71        return mCancellationSignal != null && !mCancellationSignal.isCanceled();
72    }
73
74    private void setFingerprintIconVisibility(boolean visible) {
75        mIcon.setVisibility(visible ? View.VISIBLE : View.GONE);
76        mCallback.onFingerprintIconVisibilityChanged(visible);
77    }
78
79    @Override
80    public void onAuthenticationError(int errMsgId, CharSequence errString) {
81        showError(errString);
82        setFingerprintIconVisibility(false);
83    }
84
85    @Override
86    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
87        showError(helpString);
88    }
89
90    @Override
91    public void onAuthenticationFailed() {
92        showError(mIcon.getResources().getString(
93                R.string.fingerprint_not_recognized));
94    }
95
96    @Override
97    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
98        mIcon.setImageResource(R.drawable.ic_fingerprint_success);
99        mCallback.onAuthenticated();
100    }
101
102    private void showError(CharSequence error) {
103        if (!isListening()) {
104            return;
105        }
106
107        mIcon.setImageResource(R.drawable.ic_fingerprint_error);
108        mErrorTextView.setText(error);
109        mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
110        mErrorTextView.postDelayed(mResetErrorTextRunnable, ERROR_TIMEOUT);
111    }
112
113    private Runnable mResetErrorTextRunnable = new Runnable() {
114        @Override
115        public void run() {
116            mErrorTextView.setText("");
117            mIcon.setImageResource(R.drawable.ic_fingerprint);
118        }
119    };
120
121    public interface Callback {
122        void onAuthenticated();
123        void onFingerprintIconVisibilityChanged(boolean visible);
124    }
125}
126