Disable home intent receiver for kiosk mode by default

Disabling the KioskModeActivity's home intent receiver by default to
avoid showing disambig dialogs when entering the home screen. The
activity is enabled when kiosk mode is started disabled again when it
is stopped.

Bug: 21356748
Change-Id: I90774c5bd96e0cc28a90a219f6f8d5e2028a63b9

Author: bfranz

app/src/main/AndroidManifest.xml

@@ -43,7 +43,8 @@ limitations under the License.
         <activity
                 android:name=".policy.locktask.KioskModeActivity"
                 android:label="@string/kiosk_mode"
-                android:launchMode="singleInstance">
+                android:launchMode="singleInstance"
+                android:enabled="false">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.HOME"/>

app/src/main/java/com/google/android/testdpc/policy/PolicyManagementFragment.java

@@ -1600,6 +1600,10 @@ private void startKioskMode(String[] lockTaskArray) {
         Intent launchIntent = new Intent(getActivity(), KioskModeActivity.class);
         launchIntent.putExtra(KioskModeActivity.LOCKED_APP_PACKAGE_LIST, lockTaskArray);
         launchIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        getActivity().getPackageManager().setComponentEnabledSetting(
+                new ComponentName(mPackageName, KioskModeActivity.class.getName()),
+                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
+                PackageManager.DONT_KILL_APP);
         startActivity(launchIntent);
         getActivity().finish();
     }

app/src/main/java/com/google/android/testdpc/policy/locktask/KioskModeActivity.java

@@ -93,8 +93,11 @@ protected void onCreate(Bundle savedInstanceState) {
             for (String pkg : packageArray) {
                 mKioskPackages.add(pkg);
             }
+            mKioskPackages.remove(getPackageName());
+            mKioskPackages.add(getPackageName());
             setDefaultKioskPolicies(true);
         } else {
+            // after a reboot there is no need to set the policies again
             SharedPreferences sharedPreferences = getSharedPreferences(KIOSK_PREFERENCE_FILE,
                     MODE_PRIVATE);
             mKioskPackages = new ArrayList<>(sharedPreferences.getStringSet(KIOSK_APPS_KEY,
@@ -135,6 +138,10 @@ protected void onStart() {
     public void onBackdoorClicked() {
         stopLockTask();
         setDefaultKioskPolicies(false);
+        mPackageManager.setComponentEnabledSetting(
+                new ComponentName(getPackageName(), getClass().getName()),
+                PackageManager.COMPONENT_ENABLED_STATE_DEFAULT,
+                PackageManager.DONT_KILL_APP);
         finish();
     }