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      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 
     17 package com.android.settings.fingerprint;
     18 
     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;
     24 
     25 import com.android.settings.R;
     26 
     27 /**
     28  * Small helper class to manage text/icon around fingerprint authentication UI.
     29  */
     30 public 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