Add dialog when user touches fingerprint icon

Bug: 20495507
Change-Id: I6779aba7ca988fd9a8eee07afca2a410de144a26

res/values/strings.xml

@@ -788,6 +788,10 @@
     <string name="security_settings_fingerprint_enroll_setup_screen_lock">Setup screen lock</string>
     <!-- Button text to exit fingerprint wizard after everything is done [CHAR LIMIT=15] -->
     <string name="security_settings_fingerprint_enroll_done">Done</string>
+    <!-- Dialog title for dialog which shows when user touches the icon on the screen, instead of the sensor at the back [CHAR LIMIT=45] -->
+    <string name="security_settings_fingerprint_enroll_touch_dialog_title">Whoops, that\'s not the sensor</string>
+    <!-- Dialog message for dialog which shows when user touches the icon on the screen, instead of the sensor at the back [CHAR LIMIT=45] -->
+    <string name="security_settings_fingerprint_enroll_touch_dialog_message">Use the fingerprint sensor on your device.</string>
     <!-- Button text shown at the end of enrollment that allows the user to add another fingerprint -->
     <string name="fingerprint_enroll_button_add">Add another</string>
     <!-- Button text shown at the end of enrollment that allows the user to move to the next step -->

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

@@ -18,12 +18,17 @@ package com.android.settings.fingerprint;
 
 import android.animation.Animator;
 import android.animation.ObjectAnimator;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Bundle;
 import android.os.CancellationSignal;
 import android.os.PowerManager;
 import android.os.SystemClock;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.animation.AnimationUtils;
 import android.view.animation.Interpolator;
@@ -42,6 +47,12 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase {
     private static final int PROGRESS_BAR_MAX = 10000;
     private static final int FINISH_DELAY = 250;
 
+    /**
+     * How many times the user needs to touch the icon until we show the dialog that this is not the
+     * fingerprint sensor.
+     */
+    private static final int ICON_TOUCH_COUNT_SHOW_UNTIL_DIALOG_SHOWN = 3;
+
     private PowerManager mPowerManager;
     private CancellationSignal mEnrollmentCancel = new CancellationSignal();
     private int mEnrollmentSteps;
@@ -53,6 +64,7 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase {
     private TextView mRepeatMessage;
     private TextView mErrorText;
     private Interpolator mFastOutSlowInInterpolator;
+    private int mIconTouchCount;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -67,6 +79,19 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase {
         mFingerprintAnimator = (ImageView) findViewById(R.id.fingerprint_animator);
         mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(
                 this, android.R.interpolator.fast_out_slow_in);
+        findViewById(R.id.fingerprint_animator).setOnTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
+                    mIconTouchCount++;
+                    if (mIconTouchCount == ICON_TOUCH_COUNT_SHOW_UNTIL_DIALOG_SHOWN) {
+                        showIconTouchDialog();
+                        mIconTouchCount = 0;
+                    }
+                }
+                return true;
+            }
+        });
         startEnrollment();
     }
 
@@ -125,6 +150,10 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase {
         }
     }
 
+    private void showIconTouchDialog() {
+        new IconTouchDialog().show(getFragmentManager(), null /* tag */);
+    }
+
     private final Animator.AnimatorListener mProgressAnimationListener
             = new Animator.AnimatorListener() {
 
@@ -184,4 +213,22 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase {
             launchFinish(mToken);
         }
     };
+
+    private static class IconTouchDialog extends DialogFragment {
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+            builder.setTitle(R.string.security_settings_fingerprint_enroll_touch_dialog_title)
+                    .setMessage(R.string.security_settings_fingerprint_enroll_touch_dialog_message)
+                    .setPositiveButton(R.string.security_settings_fingerprint_enroll_dialog_ok,
+                            new DialogInterface.OnClickListener() {
+                                @Override
+                                public void onClick(DialogInterface dialog, int which) {
+                                    dialog.dismiss();
+                                }
+                            });
+            return builder.create();
+        }
+    }
 }