Adding alarms and reminders activity

Adding a settings screen to control the permission SCHEDULE_EXACT_ALARM.
Apps can start this by starting a newly introduced API intent
REQUEST_SCHEDULE_EXACT_ALARM.

Test: make -j RunSettingsRoboTests
Manually by UI inspection:
Settings -> Apps -> Special App access -> Alarms and Reminders
or by running:
adb shell am start -a android.settings.REQUEST_SCHEDULE_EXACT_ALARM

Bug: 171306433
Bug: 171305516
Change-Id: I1293d38fc50a22b2af46f80ab24f676ed632f964

src/com/android/settings/applications/appinfo/AlarmsAndRemindersDetails.java

@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2021 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.applications.appinfo;
+
+import static android.app.Activity.RESULT_CANCELED;
+import static android.app.Activity.RESULT_OK;
+
+import android.app.AppOpsManager;
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+import android.os.Bundle;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.preference.Preference;
+import androidx.preference.Preference.OnPreferenceChangeListener;
+
+import com.android.settings.R;
+import com.android.settings.Settings;
+import com.android.settings.applications.AppInfoWithHeader;
+import com.android.settings.applications.AppStateAlarmsAndRemindersBridge;
+import com.android.settings.applications.AppStateAppOpsBridge;
+import com.android.settingslib.RestrictedSwitchPreference;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+
+/**
+ * App specific activity to show details about
+ * {@link android.Manifest.permission#SCHEDULE_EXACT_ALARM}.
+ */
+public class AlarmsAndRemindersDetails extends AppInfoWithHeader
+        implements OnPreferenceChangeListener {
+
+    private static final String KEY_SWITCH = "alarms_and_reminders_switch";
+
+    private AppStateAlarmsAndRemindersBridge mAppBridge;
+    private AppOpsManager mAppOpsManager;
+    private RestrictedSwitchPreference mSwitchPref;
+    private AppStateAppOpsBridge.PermissionState mPermissionState;
+
+    /**
+     * Returns the string that states whether the app has access to
+     * {@link android.Manifest.permission#SCHEDULE_EXACT_ALARM}.
+     */
+    public static int getSummary(Context context, AppEntry entry) {
+        final AppStateAppOpsBridge.PermissionState state;
+        if (entry.extraInfo instanceof AppStateAppOpsBridge.PermissionState) {
+            state = (AppStateAppOpsBridge.PermissionState) entry.extraInfo;
+        } else {
+            state = new AppStateAlarmsAndRemindersBridge(context, /*appState=*/null,
+                    /*callback=*/null).createPermissionState(entry.info.packageName,
+                    entry.info.uid);
+        }
+
+        return state.isPermissible() ? R.string.app_permission_summary_allowed
+                : R.string.app_permission_summary_not_allowed;
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Context context = getActivity();
+        mAppBridge = new AppStateAlarmsAndRemindersBridge(context, mState, /*callback=*/null);
+        mAppOpsManager = context.getSystemService(AppOpsManager.class);
+
+        addPreferencesFromResource(R.xml.alarms_and_reminders);
+        mSwitchPref = findPreference(KEY_SWITCH);
+        mSwitchPref.setOnPreferenceChangeListener(this);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean checked = (Boolean) newValue;
+        if (preference == mSwitchPref) {
+            if (mPermissionState != null && checked != mPermissionState.isPermissible()) {
+                if (Settings.AlarmsAndRemindersAppActivity.class.getName().equals(
+                        getIntent().getComponent().getClassName())) {
+                    setResult(checked ? RESULT_OK : RESULT_CANCELED);
+                }
+                setCanScheduleAlarms(checked);
+                logPermissionChange(checked, mPackageName);
+                refreshUi();
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void setCanScheduleAlarms(boolean newState) {
+        mAppOpsManager.setUidMode(AppOpsManager.OPSTR_SCHEDULE_EXACT_ALARM,
+                mPackageInfo.applicationInfo.uid,
+                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
+    }
+
+    private void logPermissionChange(boolean newState, String packageName) {
+        mMetricsFeatureProvider.action(
+                mMetricsFeatureProvider.getAttribution(getActivity()),
+                SettingsEnums.ACTION_ALARMS_AND_REMINDERS_TOGGLE,
+                getMetricsCategory(),
+                packageName,
+                newState ? 1 : 0);
+    }
+
+    @Override
+    protected boolean refreshUi() {
+        if (mPackageInfo == null || mPackageInfo.applicationInfo == null) {
+            return false;
+        }
+        mPermissionState = mAppBridge.createPermissionState(mPackageName,
+                mPackageInfo.applicationInfo.uid);
+        mSwitchPref.setEnabled(mPermissionState.permissionDeclared);
+        mSwitchPref.setChecked(mPermissionState.isPermissible());
+        return true;
+    }
+
+    @Override
+    protected AlertDialog createDialog(int id, int errorCode) {
+        return null;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.ALARMS_AND_REMINDERS;
+    }
+}