Vibrate when fingerprint error text is shown

Some users block the screen when enrolling the fingerprint. Vibrate
the phone to prompt the user to look at the screen in case they get
stuck.

Test: cd tests/robotests && mma
Bug: 67664182
Change-Id: I70dc5a5a566f2e764f8109fb2be25ec6d7c48da9

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

@@ -32,6 +32,8 @@ import android.graphics.drawable.LayerDrawable;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Bundle;
 import android.os.UserHandle;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
 import android.text.TextUtils;
 import android.view.MotionEvent;
 import android.view.View;
@@ -74,6 +76,9 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
      */
     private static final int ICON_TOUCH_COUNT_SHOW_UNTIL_DIALOG_SHOWN = 3;
 
+    private static final VibrationEffect VIBRATE_EFFECT_ERROR =
+            VibrationEffect.createWaveform(new long[] {0, 5, 55, 60}, -1);
+
     private ProgressBar mProgressBar;
     private ObjectAnimator mProgressAnim;
     private TextView mStartMessage;
@@ -90,6 +95,7 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
     private int mIndicatorBackgroundRestingColor;
     private int mIndicatorBackgroundActivatedColor;
     private boolean mRestoring;
+    private Vibrator mVibrator;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -100,6 +106,7 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
         mRepeatMessage = (TextView) findViewById(R.id.repeat_message);
         mErrorText = (TextView) findViewById(R.id.error_text);
         mProgressBar = (ProgressBar) findViewById(R.id.fingerprint_progress_bar);
+        mVibrator = getSystemService(Vibrator.class);
 
         Button skipButton = findViewById(R.id.skip_button);
         skipButton.setOnClickListener(this);
@@ -368,6 +375,9 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
             mErrorText.setAlpha(1f);
             mErrorText.setTranslationY(0f);
         }
+        if (isResumed()) {
+            mVibrator.vibrate(VIBRATE_EFFECT_ERROR);
+        }
     }
 
     private void clearError() {
@@ -378,12 +388,7 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
                             R.dimen.fingerprint_error_text_disappear_distance))
                     .setDuration(100)
                     .setInterpolator(mFastOutLinearInInterpolator)
-                    .withEndAction(new Runnable() {
-                        @Override
-                        public void run() {
-                            mErrorText.setVisibility(View.INVISIBLE);
-                        }
-                    })
+                    .withEndAction(() -> mErrorText.setVisibility(View.INVISIBLE))
                     .start();
         }
     }