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/FingerprintEnrollEnrolling.java

@@ -46,7 +46,6 @@ import androidx.appcompat.app.AlertDialog;
 
 import com.android.settings.R;
 import com.android.settings.biometrics.BiometricEnrollSidecar;
-import com.android.settings.biometrics.BiometricErrorDialog;
 import com.android.settings.biometrics.BiometricUtils;
 import com.android.settings.biometrics.BiometricsEnrollEnrolling;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
@@ -111,32 +110,6 @@ public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {
     private boolean mRestoring;
     private Vibrator mVibrator;
 
-    public static class FingerprintErrorDialog extends BiometricErrorDialog {
-        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 getMetricsCategory() {
-            return SettingsEnums.DIALOG_FINGERPINT_ERROR;
-        }
-
-        @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
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -339,19 +312,7 @@ public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {
 
     @Override
     public void onEnrollmentError(int errMsgId, CharSequence errString) {
-        int msgId;
+        FingerprintErrorDialog.showErrorDialog(this, errMsgId);
-        switch (errMsgId) {
-            case FingerprintManager.FINGERPRINT_ERROR_TIMEOUT:
-                // This message happens when the underlying crypto layer decides to revoke the
-                // enrollment auth token.
-                msgId = R.string.security_settings_fingerprint_enroll_error_timeout_dialog_message;
-                break;
-            default:
-                // There's nothing specific to tell the user about. Ask them to try again.
-                msgId = R.string.security_settings_fingerprint_enroll_error_generic_dialog_message;
-                break;
-        }
-        showErrorDialog(getText(msgId), errMsgId);
         stopIconAnimation();
         if (!mCanAssumeUdfps) {
             mErrorText.removeCallbacks(mTouchAgainRunnable);
@@ -398,11 +359,6 @@ public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {
         return PROGRESS_BAR_MAX * progress / (steps + 1);
     }
 
-    private void showErrorDialog(CharSequence msg, int msgId) {
-        BiometricErrorDialog dlg = FingerprintErrorDialog.newInstance(msg, msgId);
-        dlg.show(getSupportFragmentManager(), FingerprintErrorDialog.class.getName());
-    }
-
     private void showIconTouchDialog() {
         mIconTouchCount = 0;
         new IconTouchDialog().show(getSupportFragmentManager(), null /* tag */);

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

@@ -28,7 +28,7 @@ import androidx.annotation.Nullable;
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.biometrics.BiometricEnrollBase;
-import com.android.settings.biometrics.BiometricEnrollSidecar.Listener;
+import com.android.settings.biometrics.BiometricEnrollSidecar;
 import com.android.settings.biometrics.BiometricUtils;
 import com.android.settings.password.ChooseLockSettingsHelper;
 
@@ -40,7 +40,8 @@ import java.util.List;
 /**
  * Activity explaining the fingerprint sensor location for fingerprint enrollment.
  */
-public class FingerprintEnrollFindSensor extends BiometricEnrollBase {
+public class FingerprintEnrollFindSensor extends BiometricEnrollBase implements
+        BiometricEnrollSidecar.Listener {
 
     @Nullable
     private FingerprintFindSensorAnimation mAnimation;
@@ -139,7 +140,9 @@ public class FingerprintEnrollFindSensor extends BiometricEnrollBase {
                     .add(mSidecar, FingerprintEnrollEnrolling.TAG_SIDECAR)
                     .commitAllowingStateLoss();
         }
-        mSidecar.setListener(new Listener() {
+        mSidecar.setListener(this);
+    }
+
     @Override
     public void onEnrollmentProgressChange(int steps, int remaining) {
         mNextClicked = true;
@@ -155,10 +158,10 @@ public class FingerprintEnrollFindSensor extends BiometricEnrollBase {
         if (mNextClicked && errMsgId == FingerprintManager.FINGERPRINT_ERROR_CANCELED) {
             mNextClicked = false;
             proceedToEnrolling(false /* cancelEnrollment */);
+        } else {
+            FingerprintErrorDialog.showErrorDialog(this, errMsgId);
         }
     }
-        });
-    }
 
     @Override
     protected void onStop() {

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;
+    }
+}