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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.android.settings.fingerprint;
import android.hardware.fingerprint.FingerprintManager;
import android.os.CancellationSignal;
import android.text.TextUtils;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.android.settings.R;
/**
* Small helper class to manage text/icon around fingerprint authentication UI.
*/
public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallback {
private static final long ERROR_TIMEOUT = 1300;
private ImageView mIcon;
private TextView mErrorTextView;
private CancellationSignal mCancellationSignal;
private Callback mCallback;
private FingerprintManager mFingerprintManager;
private boolean mDark;
private String mIdleText;
private boolean mCanceledBySelf;
public FingerprintUiHelper(ImageView icon, TextView errorTextView, Callback callback) {
mFingerprintManager = icon.getContext().getSystemService(FingerprintManager.class);
mIcon = icon;
mErrorTextView = errorTextView;
mCallback = callback;
mDark = false;
}
public void startListening() {
if (mFingerprintManager.getEnrolledFingerprints().size() > 0) {
mCanceledBySelf = false;
mCancellationSignal = new CancellationSignal();
mFingerprintManager.authenticate(null, mCancellationSignal, 0 /* flags */, this, null);
setFingerprintIconVisibility(true);
mIcon.setImageResource(mDark ? R.drawable.ic_fingerprint_dark
: R.drawable.ic_fingerprint);
}
}
public void stopListening() {
mCanceledBySelf = true;
if (mCancellationSignal != null) {
mCancellationSignal.cancel();
mCancellationSignal = null;
}
}
public void setDarkIconography(boolean dark) {
mDark = dark;
}
public void setIdleText(String idleText) {
mIdleText = idleText;
}
private boolean isListening() {
return mCancellationSignal != null && !mCancellationSignal.isCanceled();
}
private void setFingerprintIconVisibility(boolean visible) {
mIcon.setVisibility(visible ? View.VISIBLE : View.GONE);
mCallback.onFingerprintIconVisibilityChanged(visible);
}
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
if (!mCanceledBySelf) {
showError(errString);
setFingerprintIconVisibility(false);
}
}
@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
showError(helpString);
}
@Override
public void onAuthenticationFailed() {
showError(mIcon.getResources().getString(
R.string.fingerprint_not_recognized));
}
@Override
public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
mIcon.setImageResource(R.drawable.ic_fingerprint_success);
mCallback.onAuthenticated();
}
private void showError(CharSequence error) {
if (!isListening()) {
return;
}
mIcon.setImageResource(R.drawable.ic_fingerprint_error);
mErrorTextView.setText(error);
mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
mErrorTextView.postDelayed(mResetErrorTextRunnable, ERROR_TIMEOUT);
}
private Runnable mResetErrorTextRunnable = new Runnable() {
@Override
public void run() {
mErrorTextView.setText(TextUtils.isEmpty(mIdleText) ? "" : mIdleText);
mIcon.setImageResource(mDark ? R.drawable.ic_fingerprint_dark
: R.drawable.ic_fingerprint);
}
};
public interface Callback {
void onAuthenticated();
void onFingerprintIconVisibilityChanged(boolean visible);
}
}
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