From a374bcd44dc6e8519be4909a4c58bd06baf23828 Mon Sep 17 00:00:00 2001
From: Trevor Johns <trevorjohns@google.com>
Date: Thu, 11 Aug 2016 15:54:50 -0700
Subject: [PATCH] docs: Update prebuilts for nyc-dev samples

Synced to commits:
- //developers/samples/android
  fc1c2eac13aa87531f030f8c65d7e27c301135af
- //developers/build
  18730e97939c9545a26e52d135a99045c86abeaf

Change-Id: I88952b8f86921739af9fed6b87d39a72af835748
---
 .../browseable/BasicManagedProfile/_index.jd  |   2 +-
 .../res/values/base-strings.xml               |   2 +-
 .../browseable/CardView/AndroidManifest.xml   |   3 -
 .../res/layout/fragment_card_view.xml         |   2 +-
 .../CardView/res/values/strings.xml           |   1 -
 .../CustomChoiceList/res/layout/list_item.xml |   3 +-
 .../res/layout/sample_main.xml                |   2 +
 .../ElevationDragFragment.java                |   6 +-
 .../res/layout/activity_main.xml              |  23 ++-
 .../FingerprintDialog/res/values/strings.xml  |   4 +
 ...ngerprintAuthenticationDialogFragment.java |   6 +-
 .../MainActivity.java                         | 180 ++++++++++++------
 .../WearDrawers/res/layout/activity_main.xml  |   3 +-
 13 files changed, 164 insertions(+), 73 deletions(-)

diff --git a/samples/browseable/BasicManagedProfile/_index.jd b/samples/browseable/BasicManagedProfile/_index.jd
index 1522a912c..fc6f899d4 100644
--- a/samples/browseable/BasicManagedProfile/_index.jd
+++ b/samples/browseable/BasicManagedProfile/_index.jd
@@ -9,6 +9,6 @@ sample.group=Admin
             enable or disable other apps and how to set restrictions to them. Intents can be
             configured to be forwarded between primary account and managed profile. Finally, you can
             wipe all the data associated with the profile.
-            Note that there can only be one managed profile on a device. 
+            Note that there can only be one managed profile on a device.
             
         </p>
diff --git a/samples/browseable/BasicManagedProfile/res/values/base-strings.xml b/samples/browseable/BasicManagedProfile/res/values/base-strings.xml
index 97063bc3a..862a42903 100644
--- a/samples/browseable/BasicManagedProfile/res/values/base-strings.xml
+++ b/samples/browseable/BasicManagedProfile/res/values/base-strings.xml
@@ -25,7 +25,7 @@
             enable or disable other apps and how to set restrictions to them. Intents can be
             configured to be forwarded between primary account and managed profile. Finally, you can
             wipe all the data associated with the profile.
-            Note that there can only be one managed profile on a device. 
+            Note that there can only be one managed profile on a device.
             
         
         ]]>
diff --git a/samples/browseable/CardView/AndroidManifest.xml b/samples/browseable/CardView/AndroidManifest.xml
index 6c4a9d983..b90c56bca 100644
--- a/samples/browseable/CardView/AndroidManifest.xml
+++ b/samples/browseable/CardView/AndroidManifest.xml
@@ -19,9 +19,6 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
-    <uses-sdk android:minSdkVersion="7"
-              android:targetSdkVersion="21" />
-
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
diff --git a/samples/browseable/CardView/res/layout/fragment_card_view.xml b/samples/browseable/CardView/res/layout/fragment_card_view.xml
index 432c52431..02eb45973 100644
--- a/samples/browseable/CardView/res/layout/fragment_card_view.xml
+++ b/samples/browseable/CardView/res/layout/fragment_card_view.xml
@@ -22,7 +22,7 @@
     >
 
     <LinearLayout android:layout_width="match_parent"
-                  android:layout_height="match_parent"
+                  android:layout_height="wrap_content"
                   android:orientation="vertical"
                   android:paddingBottom="@dimen/activity_vertical_margin"
                   android:paddingTop="@dimen/activity_vertical_margin"
diff --git a/samples/browseable/CardView/res/values/strings.xml b/samples/browseable/CardView/res/values/strings.xml
index c99559507..be5d9b078 100644
--- a/samples/browseable/CardView/res/values/strings.xml
+++ b/samples/browseable/CardView/res/values/strings.xml
@@ -15,7 +15,6 @@
  limitations under the License.
 -->
 <resources>
-    <string name="title_activity_card_view">CardViewActivity</string>
     <string name="cardview_contents">This is a CardView widget. CardView widgets can have
         shadows and rounded corners.
         \n\nTo create a card with a shadow, use the <font fgcolor="#FFFFFFFF">android:elevation</font>
diff --git a/samples/browseable/CustomChoiceList/res/layout/list_item.xml b/samples/browseable/CustomChoiceList/res/layout/list_item.xml
index 09a17edfe..81592a038 100644
--- a/samples/browseable/CustomChoiceList/res/layout/list_item.xml
+++ b/samples/browseable/CustomChoiceList/res/layout/list_item.xml
@@ -57,6 +57,7 @@
         android:duplicateParentState="true"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginLeft="16dp" />
+        android:layout_marginLeft="16dp"
+        android:layout_marginStart="16dp" />
 
 </com.example.android.customchoicelist.CheckableLinearLayout>
diff --git a/samples/browseable/CustomChoiceList/res/layout/sample_main.xml b/samples/browseable/CustomChoiceList/res/layout/sample_main.xml
index 17a69e411..ec3592bec 100755
--- a/samples/browseable/CustomChoiceList/res/layout/sample_main.xml
+++ b/samples/browseable/CustomChoiceList/res/layout/sample_main.xml
@@ -15,6 +15,8 @@
   -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:targetApi="HONEYCOMB"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
diff --git a/samples/browseable/ElevationDrag/src/com.example.android.elevationdrag/ElevationDragFragment.java b/samples/browseable/ElevationDrag/src/com.example.android.elevationdrag/ElevationDragFragment.java
index 9d1420649..112c6c923 100644
--- a/samples/browseable/ElevationDrag/src/com.example.android.elevationdrag/ElevationDragFragment.java
+++ b/samples/browseable/ElevationDrag/src/com.example.android.elevationdrag/ElevationDragFragment.java
@@ -26,6 +26,8 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewOutlineProvider;
 
+import java.util.Locale;
+
 public class ElevationDragFragment extends Fragment {
 
     public static final String TAG = "ElevationDragFragment";
@@ -84,7 +86,7 @@ public class ElevationDragFragment extends Fragment {
             @Override
             public void onClick(View v) {
                 mElevation += mElevationStep;
-                Log.d(TAG, String.format("Elevation: %.1f", mElevation));
+                Log.d(TAG, String.format(Locale.US, "Elevation: %.1f", mElevation));
                 floatingShape.setElevation(mElevation);
             }
         });
@@ -98,7 +100,7 @@ public class ElevationDragFragment extends Fragment {
                 if (mElevation < 0) {
                     mElevation = 0;
                 }
-                Log.d(TAG, String.format("Elevation: %.1f", mElevation));
+                Log.d(TAG, String.format(Locale.US, "Elevation: %.1f", mElevation));
                 floatingShape.setElevation(mElevation);
             }
         });
diff --git a/samples/browseable/FingerprintDialog/res/layout/activity_main.xml b/samples/browseable/FingerprintDialog/res/layout/activity_main.xml
index 8f30557b9..075899f8f 100644
--- a/samples/browseable/FingerprintDialog/res/layout/activity_main.xml
+++ b/samples/browseable/FingerprintDialog/res/layout/activity_main.xml
@@ -77,8 +77,27 @@
                 android:layout_gravity="end"
                 android:textColor="?android:attr/textColorPrimaryInverse"
                 android:text="@string/purchase"
-                android:id="@+id/purchase_button"
-                android:layout_alignParentEnd="true"/>
+                android:id="@+id/purchase_button" />
+
+        <Button style="@android:style/Widget.Material.Button.Colored"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="4dp"
+            android:layout_gravity="end"
+            android:textColor="?android:attr/textColorPrimaryInverse"
+            android:text="@string/purchase_not_invalidated"
+            android:id="@+id/purchase_button_not_invalidated" />
+
+        <TextView
+            android:id="@+id/purchase_button_not_invalidated_description"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="4dp"
+            android:gravity="end"
+            android:textAlignment="gravity"
+            android:text="@string/purchase_button_not_invalidated_description"
+            />
 
         <TextView
                 android:id="@+id/confirmation_message"
diff --git a/samples/browseable/FingerprintDialog/res/values/strings.xml b/samples/browseable/FingerprintDialog/res/values/strings.xml
index 77d1176e9..86f200c97 100644
--- a/samples/browseable/FingerprintDialog/res/values/strings.xml
+++ b/samples/browseable/FingerprintDialog/res/values/strings.xml
@@ -31,6 +31,10 @@
     <string name="fingerprint_hint">Touch sensor</string>
     <string name="password_description">Enter your store password to continue</string>
     <string name="purchase">Purchase</string>
+    <string name="purchase_not_invalidated">Purchase not invalidated</string>
+    <string name="purchase_button_not_invalidated_description">
+        You can proceed to purchase with this button \n even if a new fingerprint is enrolled
+    </string>
     <string name="fingerprint_not_recognized">Fingerprint not recognized. Try again</string>
     <string name="fingerprint_success">Fingerprint recognized</string>
     <string name="item_title">White Mesh Pluto Backpack</string>
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
index cb240dba2..053757330 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
@@ -181,12 +181,12 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
 
             if (mUseFingerprintFutureCheckBox.isChecked()) {
                 // Re-create the key so that fingerprints including new ones are validated.
-                mActivity.createKey();
+                mActivity.createKey(MainActivity.DEFAULT_KEY_NAME, true);
                 mStage = Stage.FINGERPRINT;
             }
         }
         mPassword.setText("");
-        mActivity.onPurchased(false /* without Fingerprint */);
+        mActivity.onPurchased(false /* without Fingerprint */, null);
         dismiss();
     }
 
@@ -243,7 +243,7 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
     public void onAuthenticated() {
         // Callback from FingerprintUiHelper. Let the activity know that authentication was
         // successful.
-        mActivity.onPurchased(true /* withFingerprint */);
+        mActivity.onPurchased(true /* withFingerprint */, mCryptoObject);
         dismiss();
     }
 
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
index 77c87886e..400b2d694 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
@@ -21,11 +21,13 @@ import android.app.KeyguardManager;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.hardware.fingerprint.FingerprintManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.security.keystore.KeyGenParameterSpec;
 import android.security.keystore.KeyPermanentlyInvalidatedException;
 import android.security.keystore.KeyProperties;
+import android.support.annotation.Nullable;
 import android.util.Base64;
 import android.util.Log;
 import android.view.Menu;
@@ -61,12 +63,11 @@ public class MainActivity extends Activity {
 
     private static final String DIALOG_FRAGMENT_TAG = "myFragment";
     private static final String SECRET_MESSAGE = "Very secret message";
-    /** Alias for our key in the Android Key Store */
-    private static final String KEY_NAME = "my_key";
+    private static final String KEY_NAME_NOT_INVALIDATED = "key_not_invalidated";
+    static final String DEFAULT_KEY_NAME = "default_key";
 
     private KeyStore mKeyStore;
     private KeyGenerator mKeyGenerator;
-    private Cipher mCipher;
     private SharedPreferences mSharedPreferences;
 
     @Override
@@ -85,8 +86,13 @@ public class MainActivity extends Activity {
         } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
             throw new RuntimeException("Failed to get an instance of KeyGenerator", e);
         }
+        Cipher defaultCipher;
+        Cipher cipherNotInvalidated;
         try {
-            mCipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
+            defaultCipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
+                    + KeyProperties.BLOCK_MODE_CBC + "/"
+                    + KeyProperties.ENCRYPTION_PADDING_PKCS7);
+            cipherNotInvalidated = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
                     + KeyProperties.BLOCK_MODE_CBC + "/"
                     + KeyProperties.ENCRYPTION_PADDING_PKCS7);
         } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
@@ -97,6 +103,22 @@ public class MainActivity extends Activity {
         KeyguardManager keyguardManager = getSystemService(KeyguardManager.class);
         FingerprintManager fingerprintManager = getSystemService(FingerprintManager.class);
         Button purchaseButton = (Button) findViewById(R.id.purchase_button);
+        Button purchaseButtonNotInvalidated = (Button) findViewById(
+                R.id.purchase_button_not_invalidated);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            purchaseButtonNotInvalidated.setEnabled(true);
+            purchaseButtonNotInvalidated.setOnClickListener(
+                    new PurchaseButtonClickListener(cipherNotInvalidated,
+                            KEY_NAME_NOT_INVALIDATED));
+        } else {
+            // Hide the purchase button which uses a non-invalidated key
+            // if the app doesn't work on Android N preview
+            purchaseButtonNotInvalidated.setVisibility(View.GONE);
+            findViewById(R.id.purchase_button_not_invalidated_description)
+                    .setVisibility(View.GONE);
+        }
+
         if (!keyguardManager.isKeyguardSecure()) {
             // Show a message that the user hasn't set up a fingerprint or lock screen.
             Toast.makeText(this,
@@ -104,6 +126,7 @@ public class MainActivity extends Activity {
                             + "Go to 'Settings -> Security -> Fingerprint' to set up a fingerprint",
                     Toast.LENGTH_LONG).show();
             purchaseButton.setEnabled(false);
+            purchaseButtonNotInvalidated.setEnabled(false);
             return;
         }
 
@@ -119,62 +142,27 @@ public class MainActivity extends Activity {
                     Toast.LENGTH_LONG).show();
             return;
         }
-        createKey();
+        createKey(DEFAULT_KEY_NAME, true);
+        createKey(KEY_NAME_NOT_INVALIDATED, false);
         purchaseButton.setEnabled(true);
-        purchaseButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                findViewById(R.id.confirmation_message).setVisibility(View.GONE);
-                findViewById(R.id.encrypted_message).setVisibility(View.GONE);
-
-                // Set up the crypto object for later. The object will be authenticated by use
-                // of the fingerprint.
-                if (initCipher()) {
-                    // Show the fingerprint dialog. The user has the option to use the fingerprint
-                    // with crypto, or you can fall back to using a server-side verified password.
-                    FingerprintAuthenticationDialogFragment fragment
-                            = new FingerprintAuthenticationDialogFragment();
-                    fragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
-                    boolean useFingerprintPreference = mSharedPreferences
-                            .getBoolean(getString(R.string.use_fingerprint_to_authenticate_key),
-                                    true);
-                    if (useFingerprintPreference) {
-                        fragment.setStage(
-                                FingerprintAuthenticationDialogFragment.Stage.FINGERPRINT);
-                    } else {
-                        fragment.setStage(
-                                FingerprintAuthenticationDialogFragment.Stage.PASSWORD);
-                    }
-                    fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
-                } else {
-                    // This happens if the lock screen has been disabled or or a fingerprint got
-                    // enrolled. Thus show the dialog to authenticate with their password first
-                    // and ask the user if they want to authenticate with fingerprints in the
-                    // future
-                    FingerprintAuthenticationDialogFragment fragment
-                            = new FingerprintAuthenticationDialogFragment();
-                    fragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
-                    fragment.setStage(
-                            FingerprintAuthenticationDialogFragment.Stage.NEW_FINGERPRINT_ENROLLED);
-                    fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
-                }
-            }
-        });
+        purchaseButton.setOnClickListener(
+                new PurchaseButtonClickListener(defaultCipher, DEFAULT_KEY_NAME));
     }
 
     /**
-     * Initialize the {@link Cipher} instance with the created key in the {@link #createKey()}
-     * method.
+     * Initialize the {@link Cipher} instance with the created key in the
+     * {@link #createKey(String, boolean)} method.
      *
+     * @param keyName the key name to init the cipher
      * @return {@code true} if initialization is successful, {@code false} if the lock screen has
      * been disabled or reset after the key was generated, or if a fingerprint got enrolled after
      * the key was generated.
      */
-    private boolean initCipher() {
+    private boolean initCipher(Cipher cipher, String keyName) {
         try {
             mKeyStore.load(null);
-            SecretKey key = (SecretKey) mKeyStore.getKey(KEY_NAME, null);
-            mCipher.init(Cipher.ENCRYPT_MODE, key);
+            SecretKey key = (SecretKey) mKeyStore.getKey(keyName, null);
+            cipher.init(Cipher.ENCRYPT_MODE, key);
             return true;
         } catch (KeyPermanentlyInvalidatedException e) {
             return false;
@@ -184,11 +172,19 @@ public class MainActivity extends Activity {
         }
     }
 
-    public void onPurchased(boolean withFingerprint) {
+    /**
+     * Proceed the purchase operation
+     *
+     * @param withFingerprint {@code true} if the purchase was made by using a fingerprint
+     * @param cryptoObject the Crypto object
+     */
+    public void onPurchased(boolean withFingerprint,
+            @Nullable FingerprintManager.CryptoObject cryptoObject) {
         if (withFingerprint) {
             // If the user has authenticated with fingerprint, verify that using cryptography and
             // then show the confirmation message.
-            tryEncrypt();
+            assert cryptoObject != null;
+            tryEncrypt(cryptoObject.getCipher());
         } else {
             // Authentication happened with backup password. Just show the confirmation message.
             showConfirmation(null);
@@ -209,9 +205,9 @@ public class MainActivity extends Activity {
      * Tries to encrypt some data with the generated key in {@link #createKey} which is
      * only works if the user has just authenticated via fingerprint.
      */
-    private void tryEncrypt() {
+    private void tryEncrypt(Cipher cipher) {
         try {
-            byte[] encrypted = mCipher.doFinal(SECRET_MESSAGE.getBytes());
+            byte[] encrypted = cipher.doFinal(SECRET_MESSAGE.getBytes());
             showConfirmation(encrypted);
         } catch (BadPaddingException | IllegalBlockSizeException e) {
             Toast.makeText(this, "Failed to encrypt the data with the generated key. "
@@ -223,8 +219,18 @@ public class MainActivity extends Activity {
     /**
      * Creates a symmetric key in the Android Key Store which can only be used after the user has
      * authenticated with fingerprint.
+     *
+     * @param keyName the name of the key to be created
+     * @param invalidatedByBiometricEnrollment if {@code false} is passed, the created key will not
+     *                                         be invalidated even if a new fingerprint is enrolled.
+     *                                         The default value is {@code true}, so passing
+     *                                         {@code true} doesn't change the behavior
+     *                                         (the key will be invalidated if a new fingerprint is
+     *                                         enrolled.). Note that this parameter is only valid if
+     *                                         the app works on Android N developer preview.
+     *
      */
-    public void createKey() {
+    public void createKey(String keyName, boolean invalidatedByBiometricEnrollment) {
         // The enrolling flow for fingerprint. This is where you ask the user to set up fingerprint
         // for your flow. Use of keys is necessary if you need to know if the set of
         // enrolled fingerprints has changed.
@@ -232,15 +238,25 @@ public class MainActivity extends Activity {
             mKeyStore.load(null);
             // Set the alias of the entry in Android KeyStore where the key will appear
             // and the constrains (purposes) in the constructor of the Builder
-            mKeyGenerator.init(new KeyGenParameterSpec.Builder(KEY_NAME,
+
+            KeyGenParameterSpec.Builder builder = new KeyGenParameterSpec.Builder(keyName,
                     KeyProperties.PURPOSE_ENCRYPT |
                             KeyProperties.PURPOSE_DECRYPT)
                     .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
                     // Require the user to authenticate with a fingerprint to authorize every use
                     // of the key
                     .setUserAuthenticationRequired(true)
-                    .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
-                    .build());
+                    .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7);
+
+            // This is a workaround to avoid crashes on devices whose API level is < 24
+            // because KeyGenParameterSpec.Builder#setInvalidatedByBiometricEnrollment is only
+            // visible on API level +24.
+            // Ideally there should be a compat library for KeyGenParameterSpec.Builder but
+            // which isn't available yet.
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                builder.setInvalidatedByBiometricEnrollment(invalidatedByBiometricEnrollment);
+            }
+            mKeyGenerator.init(builder.build());
             mKeyGenerator.generateKey();
         } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException
                 | CertificateException | IOException e) {
@@ -265,4 +281,54 @@ public class MainActivity extends Activity {
         }
         return super.onOptionsItemSelected(item);
     }
+
+    private class PurchaseButtonClickListener implements View.OnClickListener {
+
+        Cipher mCipher;
+        String mKeyName;
+
+        PurchaseButtonClickListener(Cipher cipher, String keyName) {
+            mCipher = cipher;
+            mKeyName = keyName;
+        }
+
+        @Override
+        public void onClick(View view) {
+            findViewById(R.id.confirmation_message).setVisibility(View.GONE);
+            findViewById(R.id.encrypted_message).setVisibility(View.GONE);
+
+            // Set up the crypto object for later. The object will be authenticated by use
+            // of the fingerprint.
+            if (initCipher(mCipher, mKeyName)) {
+
+                // Show the fingerprint dialog. The user has the option to use the fingerprint with
+                // crypto, or you can fall back to using a server-side verified password.
+                FingerprintAuthenticationDialogFragment fragment
+                        = new FingerprintAuthenticationDialogFragment();
+                fragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
+                boolean useFingerprintPreference = mSharedPreferences
+                        .getBoolean(getString(R.string.use_fingerprint_to_authenticate_key),
+                                true);
+                if (useFingerprintPreference) {
+                    fragment.setStage(
+                            FingerprintAuthenticationDialogFragment.Stage.FINGERPRINT);
+                } else {
+                    fragment.setStage(
+                            FingerprintAuthenticationDialogFragment.Stage.PASSWORD);
+                }
+                fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
+            } else {
+                // This happens if the lock screen has been disabled or or a fingerprint got
+                // enrolled. Thus show the dialog to authenticate with their password first
+                // and ask the user if they want to authenticate with fingerprints in the
+                // future
+                FingerprintAuthenticationDialogFragment fragment
+                        = new FingerprintAuthenticationDialogFragment();
+                fragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
+                fragment.setStage(
+                        FingerprintAuthenticationDialogFragment.Stage.NEW_FINGERPRINT_ENROLLED);
+                fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
+            }
+        }
+    }
 }
diff --git a/samples/browseable/WearDrawers/res/layout/activity_main.xml b/samples/browseable/WearDrawers/res/layout/activity_main.xml
index 97e036682..6362ebbd9 100644
--- a/samples/browseable/WearDrawers/res/layout/activity_main.xml
+++ b/samples/browseable/WearDrawers/res/layout/activity_main.xml
@@ -21,6 +21,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@color/black"
     tools:context="com.example.android.wearable.wear.weardrawers.MainActivity"
     tools:deviceIds="wear">
 
@@ -33,7 +34,7 @@
         android:id="@+id/top_navigation_drawer"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="@color/dark_grey" />
+        android:background="@color/grey" />
 
     <android.support.wearable.view.drawer.WearableActionDrawer
         android:id="@+id/bottom_action_drawer"