Handle fp enrollment errors more gracefully

- When finger can't be analyzed for enrollment
(FINGERPRINT_ERROR_UNABLE_TO_PROCESS), tell the user
to try again or use a different finger.
- When timeout is reached (FINGERPRINT_ERROR_TIMEOUT),
stop enrollment and ask the user to try again.

Fixes bug 23546104
Fixes bug 22708384

Change-Id: I879874b53dd0d928093fab1c92d0d4d68d73be28

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

@@ -38,23 +38,9 @@ import com.android.setupwizardlib.view.NavigationBar;
  */
 public abstract class FingerprintEnrollBase extends InstrumentedActivity
         implements View.OnClickListener {
-
-    /**
-     * Used by the choose fingerprint wizard to indicate the wizard is
-     * finished, and each activity in the wizard should finish.
-     * <p>
-     * Previously, each activity in the wizard would finish itself after
-     * starting the next activity. However, this leads to broken 'Back'
-     * behavior. So, now an activity does not finish itself until it gets this
-     * result.
-     */
-    protected static final int RESULT_FINISHED = RESULT_FIRST_USER;
-
-    /**
-     * Used by the enrolling screen during setup wizard to skip over setting up fingerprint, which
-     * will be useful if the user accidentally entered this flow.
-     */
-    protected static final int RESULT_SKIP = RESULT_FIRST_USER + 1;
+    static final int RESULT_FINISHED = FingerprintSettings.RESULT_FINISHED;
+    static final int RESULT_SKIP = FingerprintSettings.RESULT_SKIP;
+    static final int RESULT_TIMEOUT = FingerprintSettings.RESULT_TIMEOUT;
 
     protected byte[] mToken;