Update fingerprint enroll UI to spec.

Also adds sliding animations between the steps.

Bug: 20495507
Change-Id: I148d8d8b8082361149f02fd2dc4cead0ba3e2526

src/com/android/settings/fingerprint/FingerprintUiHelper.java

@@ -0,0 +1,123 @@
+/*
+ * 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.os.Vibrator;
+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 static final long[] FP_ERROR_VIBRATE_PATTERN = new long[] {0, 30, 100, 30};
+    private static final long[] FP_SUCCESS_VIBRATE_PATTERN = new long[] {0, 30};
+
+    private ImageView mIcon;
+    private TextView mErrorTextView;
+    private CancellationSignal mCancellationSignal;
+
+    private Callback mCallback;
+    private FingerprintManager mFingerprintManager;
+
+    public FingerprintUiHelper(ImageView icon, TextView errorTextView, Callback callback) {
+        mFingerprintManager = icon.getContext().getSystemService(FingerprintManager.class);
+        mIcon = icon;
+        mErrorTextView = errorTextView;
+        mCallback = callback;
+    }
+
+    public void startListening() {
+        if (mFingerprintManager.getEnrolledFingerprints().size() > 0) {
+            mCancellationSignal = new CancellationSignal();
+            mFingerprintManager.authenticate(null, mCancellationSignal, this, 0 /* flags */);
+            setFingerprintIconVisibility(true);
+            mIcon.setImageResource(R.drawable.ic_fingerprint);
+        }
+    }
+
+    public void stopListening() {
+        if (mCancellationSignal != null) {
+            mCancellationSignal.cancel();
+            mCancellationSignal = null;
+        }
+    }
+
+    private void setFingerprintIconVisibility(boolean visible) {
+        mIcon.setVisibility(visible ? View.VISIBLE : View.GONE);
+        mCallback.onFingerprintIconVisibilityChanged(visible);
+    }
+
+    @Override
+    public void onAuthenticationError(int errMsgId, CharSequence errString) {
+        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) {
+        vibrateFingerprintSuccess();
+        mCallback.onAuthenticated();
+    }
+
+    private void showError(CharSequence error) {
+        vibrateFingerprintError();
+        mIcon.setImageResource(R.drawable.ic_fingerprint_error);
+        mErrorTextView.setText(error);
+        mErrorTextView.removeCallbacks(mResetErrorTextRunnable);
+        mErrorTextView.postDelayed(mResetErrorTextRunnable, ERROR_TIMEOUT);
+    }
+
+    private void vibrateFingerprintError() {
+        mIcon.getContext().getSystemService(Vibrator.class).vibrate(FP_ERROR_VIBRATE_PATTERN, -1);
+    }
+
+    private void vibrateFingerprintSuccess() {
+        mIcon.getContext().getSystemService(Vibrator.class).vibrate(FP_SUCCESS_VIBRATE_PATTERN, -1);
+    }
+
+    private Runnable mResetErrorTextRunnable = new Runnable() {
+        @Override
+        public void run() {
+            mErrorTextView.setText("");
+            mIcon.setImageResource(R.drawable.ic_fingerprint);
+        }
+    };
+
+    public interface Callback {
+        void onAuthenticated();
+        void onFingerprintIconVisibilityChanged(boolean visible);
+    }
+}