Add an error dialog in FingerprintEnrollFindSensor

When a device stands for a while during the fingerprint enrollment, the
fingerprint icon will disappear without any warning message. This
change is trying to show a dialog to inform users.

Fixes: 180633056
Test: visual verified
1) Settings -> Security -> Fingerprint
2) Navigate to "Touch & hold the fingerprint icon" page
3) Let device stand for a while and see if there's a dialog shown

Change-Id: I69c8fb73f2a7406e4a379396e2624fb523e162a8

src/com/android/settings/biometrics/fingerprint/FingerprintErrorDialog.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2021 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.biometrics.fingerprint;
+
+import android.app.settings.SettingsEnums;
+import android.hardware.fingerprint.FingerprintManager;
+import android.os.Bundle;
+
+import com.android.settings.R;
+import com.android.settings.biometrics.BiometricEnrollBase;
+import com.android.settings.biometrics.BiometricErrorDialog;
+
+/**
+ * Fingerprint error dialog, will be shown when an error occurs during fingerprint enrollment.
+ */
+public class FingerprintErrorDialog extends BiometricErrorDialog {
+    public static void showErrorDialog(BiometricEnrollBase host, int errMsgId) {
+        final CharSequence errMsg = host.getText(getErrorMessage(errMsgId));
+        final FingerprintErrorDialog dialog = newInstance(errMsg, errMsgId);
+        dialog.show(host.getSupportFragmentManager(), FingerprintErrorDialog.class.getName());
+    }
+
+    private static int getErrorMessage(int errMsgId) {
+        switch (errMsgId) {
+            case FingerprintManager.FINGERPRINT_ERROR_TIMEOUT:
+                // This message happens when the underlying crypto layer decides to revoke the
+                // enrollment auth token.
+                return R.string.security_settings_fingerprint_enroll_error_timeout_dialog_message;
+            default:
+                // There's nothing specific to tell the user about. Ask them to try again.
+                return R.string.security_settings_fingerprint_enroll_error_generic_dialog_message;
+        }
+    }
+
+    private static FingerprintErrorDialog newInstance(CharSequence msg, int msgId) {
+        FingerprintErrorDialog dialog = new FingerprintErrorDialog();
+        Bundle args = new Bundle();
+        args.putCharSequence(KEY_ERROR_MSG, msg);
+        args.putInt(KEY_ERROR_ID, msgId);
+        dialog.setArguments(args);
+        return dialog;
+    }
+
+    @Override
+    public int getTitleResId() {
+        return R.string.security_settings_fingerprint_enroll_error_dialog_title;
+    }
+
+    @Override
+    public int getOkButtonTextResId() {
+        return R.string.security_settings_fingerprint_enroll_dialog_ok;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.DIALOG_FINGERPINT_ERROR;
+    }
+}