Added support for DO_NOT_ASK_CREDENTIALS_ON_BOOT DPM flag

When DO_NOT_ASK_CREDENTIALS_ON_BOOT flag is set in
DevicePolicyManager, the Settings UI:
1) Should not encrypt the device with password when the
   user encrypts the device for the first time. The default
   encryption type should be used instead.
2) Should not give the choice to the user whether to
   encrypt the device with password/PIN or not but always
   encrypt the device without password.

Related CL: https://googleplex-android-review.git.corp.google.com/#/c/665371/

Change-Id: Ic09f02c033a0b16b7ffc45bf6d675b62d1be4bd8
diff --git a/src/com/android/settings/CryptKeeperSettings.java b/src/com/android/settings/CryptKeeperSettings.java
index c5a06eb..46d7dd1 100644
--- a/src/com/android/settings/CryptKeeperSettings.java
+++ b/src/com/android/settings/CryptKeeperSettings.java
@@ -39,6 +39,8 @@
 
 public class CryptKeeperSettings extends InstrumentedFragment {
     private static final String TAG = "CryptKeeper";
+    private static final String TYPE = "type";
+    private static final String PASSWORD = "password";
 
     private static final int KEYGUARD_REQUEST = 55;
 
@@ -194,8 +196,20 @@
         Preference preference = new Preference(getActivity());
         preference.setFragment(CryptKeeperConfirm.class.getName());
         preference.setTitle(R.string.crypt_keeper_confirm_title);
-        preference.getExtras().putInt("type", type);
-        preference.getExtras().putString("password", password);
+        addEncryptionInfoToPreference(preference, type, password);
         ((SettingsActivity) getActivity()).onPreferenceStartFragment(null, preference);
     }
+
+    private void addEncryptionInfoToPreference(Preference preference, int type, String password) {
+        Activity activity = getActivity();
+        DevicePolicyManager dpm = (DevicePolicyManager)
+                activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
+        if (dpm.getDoNotAskCredentialsOnBoot()) {
+            preference.getExtras().putInt(TYPE, StorageManager.CRYPT_TYPE_DEFAULT);
+            preference.getExtras().putString(PASSWORD, "");
+        } else {
+            preference.getExtras().putInt(TYPE, type);
+            preference.getExtras().putString(PASSWORD, password);
+        }
+    }
 }