Single-user restrictions

New restrictions panel for restricting list of available apps for the user.
Apps that support restrictions can also be configured here.
Restrictions screen is PIN protected and will ask you to create a PIN the
first time you use it.

Change-Id: I7a5267df4272521ad80e6a8b6a18932d07179eb8

src/com/android/settings/users/RestrictionSettings.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.users;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+
+import com.android.settings.R;
+
+import java.util.List;
+
+/**
+ * Used for restricting regular users, including single-user devices.
+ */
+public class RestrictionSettings extends AppRestrictionsFragment {
+
+    private static final int REQUEST_PIN_CHALLENGE = 10;
+
+    private static final int MENU_RESET = Menu.FIRST + 1;
+    private static final int MENU_CHANGE_PIN = Menu.FIRST + 2;
+
+    private static final String KEY_CHALLENGE_REQUESTED = "chrq";
+
+    private boolean mChallengeSucceeded;
+    private boolean mChallengeRequested;
+
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        init(icicle);
+        mChallengeSucceeded = false;
+        mChallengeRequested = icicle != null
+                ? icicle.getBoolean(KEY_CHALLENGE_REQUESTED, false)
+                : false;
+        setHasOptionsMenu(true);
+    }
+
+    public void onResume() {
+        super.onResume();
+
+        if (!mChallengeSucceeded) {
+            getListView().setEnabled(false);
+            final UserManager um = UserManager.get(getActivity());
+            if (!mChallengeRequested) {
+                if (um.hasRestrictionsPin()) {
+                    Intent requestPin =
+                            new Intent(Intent.ACTION_RESTRICTIONS_PIN_CHALLENGE);
+                    startActivityForResult(requestPin, REQUEST_PIN_CHALLENGE);
+                } else {
+                    Intent requestPin =
+                            new Intent("android.intent.action.RESTRICTIONS_PIN_CREATE");
+                    startActivityForResult(requestPin, REQUEST_PIN_CHALLENGE);
+                }
+                mChallengeRequested = true;
+            }
+        }
+        mChallengeSucceeded = false;
+    }
+
+    private void resetAndRemovePin() {
+        final UserManager um = UserManager.get(getActivity());
+        final PackageManager pm = getActivity().getPackageManager();
+        List<ApplicationInfo> installedApps = pm.getInstalledApplications(
+                PackageManager.GET_UNINSTALLED_PACKAGES);
+        UserHandle user = android.os.Process.myUserHandle();
+        for (ApplicationInfo info: installedApps) {
+            if ((info.flags & ApplicationInfo.FLAG_BLOCKED) != 0
+                    && (info.flags & ApplicationInfo.FLAG_INSTALLED) != 0) {
+                pm.setApplicationBlockedSettingAsUser(info.packageName, false, user);
+            }
+        }
+        um.changeRestrictionsPin(null);
+        clearSelectedApps();
+        finishFragment();
+    }
+
+    private void changePin() {
+        final UserManager um = UserManager.get(getActivity());
+        um.changeRestrictionsPin(null);
+        Intent requestPin = new Intent("android.intent.action.RESTRICTIONS_PIN_CREATE");
+        startActivityForResult(requestPin, REQUEST_PIN_CHALLENGE);
+    }
+
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == REQUEST_PIN_CHALLENGE) {
+            mChallengeRequested = false;
+            if (resultCode == Activity.RESULT_OK) {
+                getListView().setEnabled(true);
+                mChallengeSucceeded = true;
+            } else {
+                finishFragment();
+            }
+            return;
+        }
+
+        super.onActivityResult(requestCode, resultCode, data);
+    }
+
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(KEY_CHALLENGE_REQUESTED, mChallengeRequested);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        menu.add(0, MENU_RESET, 0, R.string.restriction_menu_reset);
+        menu.add(0, MENU_CHANGE_PIN, 0, R.string.restriction_menu_change_pin);
+
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+        case MENU_RESET:
+            resetAndRemovePin();
+            return true;
+        case MENU_CHANGE_PIN:
+            changePin();
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+}