Bug: 21589105 Rescoping SYSTEM_ALERT_WINDOW and WRITE_SETTINGS permission to an

explicit toggle to be enabled through Settings via Apps -> Advanced Apps.

Added new and refactored an old xml to define the UX for two new Preferences
in Advanced Settings. Modified the existing AdvancedAppSettings to add
control flow for two new settings. Also enriched ManageApplications to
handle these cases. Added additional strings in xml/values/strings.xml
to support these settings. Also defined new classes to handle these the
toggle of these permissions per app.

Refactored codes from AppStateUsageBridge to a generic AppStateAppOpsBridge so
that future usages related to AppOps can inherit from this class.

Change-Id: I43b81282a063e05844c7805556a6d05cfc02bcdb

src/com/android/settings/applications/AdvancedAppSettings.java

@@ -15,11 +15,14 @@
  */
 package com.android.settings.applications;
 
+import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.os.Bundle;
+import android.os.AsyncTask;
 import android.preference.Preference;
+import android.provider.Settings;
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.settings.R;
@@ -40,11 +43,15 @@ public class AdvancedAppSettings extends SettingsPreferenceFragment implements
     private static final String KEY_APP_PERM = "manage_perms";
     private static final String KEY_APP_DOMAIN_URLS = "domain_urls";
     private static final String KEY_HIGH_POWER_APPS = "high_power_apps";
+    private static final String KEY_SYSTEM_ALERT_WINDOW = "system_alert_window";
+    private static final String KEY_WRITE_SETTINGS_APPS = "write_settings_apps";
 
     private Session mSession;
     private Preference mAppPermsPreference;
     private Preference mAppDomainURLsPreference;
     private Preference mHighPowerPreference;
+    private Preference mSystemAlertWindowPreference;
+    private Preference mWriteSettingsPreference;
 
     private BroadcastReceiver mPermissionReceiver;
 
@@ -63,6 +70,8 @@ public class AdvancedAppSettings extends SettingsPreferenceFragment implements
         mAppPermsPreference = findPreference(KEY_APP_PERM);
         mAppDomainURLsPreference = findPreference(KEY_APP_DOMAIN_URLS);
         mHighPowerPreference = findPreference(KEY_HIGH_POWER_APPS);
+        mSystemAlertWindowPreference = findPreference(KEY_SYSTEM_ALERT_WINDOW);
+        mWriteSettingsPreference = findPreference(KEY_WRITE_SETTINGS_APPS);
         updateUI();
     }
 
@@ -97,6 +106,16 @@ public class AdvancedAppSettings extends SettingsPreferenceFragment implements
         }
         mPermissionReceiver = PermissionsSummaryHelper.getAppWithPermissionsCounts(getContext(),
                 mPermissionCallback);
+
+        Activity activity = getActivity();
+        ApplicationsState appState = ApplicationsState.getInstance(activity
+                .getApplication());
+        AppStateOverlayBridge overlayBridge = new AppStateOverlayBridge(activity,
+                appState, null);
+        AppStateWriteSettingsBridge writeSettingsBridge = new AppStateWriteSettingsBridge(
+                activity, appState, null);
+        new CountAppsWithOverlayPermission().execute(overlayBridge);
+        new CountAppsWithWriteSettingsPermission().execute(writeSettingsBridge);
     }
 
     @Override
@@ -159,4 +178,50 @@ public class AdvancedAppSettings extends SettingsPreferenceFragment implements
             }
         }
     };
+
+    private class CountAppsWithOverlayPermission extends
+            AsyncTask<AppStateOverlayBridge, Void, Integer> {
+        int numOfPackagesRequestedPermission = 0;
+
+        @Override
+        protected Integer doInBackground(AppStateOverlayBridge... params) {
+            AppStateOverlayBridge overlayBridge = params[0];
+            numOfPackagesRequestedPermission = overlayBridge
+                    .getNumberOfPackagesWithPermission();
+            return overlayBridge.getNumberOfPackagesCanDrawOverlay();
+        }
+
+        @Override
+        protected void onPostExecute(Integer result) {
+            // checks if fragment is still there before updating the preference object
+            if (isAdded()) {
+                mSystemAlertWindowPreference.setSummary(getContext().getString(
+                        R.string.system_alert_window_summary, result,
+                        numOfPackagesRequestedPermission));
+            }
+        }
+    }
+
+    private class CountAppsWithWriteSettingsPermission extends
+        AsyncTask<AppStateWriteSettingsBridge, Void, Integer> {
+        int numOfPackagesRequestedPermission = 0;
+
+        @Override
+        protected Integer doInBackground(AppStateWriteSettingsBridge... params) {
+            AppStateWriteSettingsBridge writeSettingsBridge = params[0];
+            numOfPackagesRequestedPermission = writeSettingsBridge
+                .getNumberOfPackagesWithPermission();
+            return writeSettingsBridge.getNumberOfPackagesCanWriteSettings();
+        }
+
+        @Override
+        protected void onPostExecute(Integer result) {
+            // checks if fragment is still there before updating the preference object
+            if (isAdded()) {
+                mWriteSettingsPreference.setSummary(getContext().getString(
+                        R.string.write_settings_summary, result,
+                        numOfPackagesRequestedPermission));
+            }
+        }
+    }
 }