1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.android.settings.applications;
17 
18 import android.app.AlertDialog;
19 import android.app.AppOpsManager;
20 import android.content.ActivityNotFoundException;
21 import android.content.Context;
22 import android.content.Intent;
23 import android.content.pm.ApplicationInfo;
24 import android.content.pm.PackageManager;
25 import android.os.Bundle;
26 import android.os.UserHandle;
27 import android.provider.Settings;
28 import android.support.v14.preference.SwitchPreference;
29 import android.support.v7.preference.Preference;
30 import android.support.v7.preference.Preference.OnPreferenceChangeListener;
31 import android.support.v7.preference.Preference.OnPreferenceClickListener;
32 import android.util.Log;
33 
34 import com.android.internal.logging.MetricsProto.MetricsEvent;
35 import com.android.settings.R;
36 import com.android.settings.applications.AppStateAppOpsBridge.PermissionState;
37 import com.android.settings.applications.AppStateOverlayBridge.OverlayState;
38 import com.android.settingslib.applications.ApplicationsState.AppEntry;
39 
40 public class DrawOverlayDetails extends AppInfoWithHeader implements OnPreferenceChangeListener,
41         OnPreferenceClickListener {
42 
43     private static final String KEY_APP_OPS_SETTINGS_SWITCH = "app_ops_settings_switch";
44     private static final String KEY_APP_OPS_SETTINGS_PREFS = "app_ops_settings_preference";
45     private static final String KEY_APP_OPS_SETTINGS_DESC = "app_ops_settings_description";
46     private static final String LOG_TAG = "DrawOverlayDetails";
47 
48     private static final int [] APP_OPS_OP_CODE = {
49             AppOpsManager.OP_SYSTEM_ALERT_WINDOW
50     };
51 
52     // Use a bridge to get the overlay details but don't initialize it to connect with all state.
53     // TODO: Break out this functionality into its own class.
54     private AppStateOverlayBridge mOverlayBridge;
55     private AppOpsManager mAppOpsManager;
56     private SwitchPreference mSwitchPref;
57     private Preference mOverlayPrefs;
58     private Preference mOverlayDesc;
59     private Intent mSettingsIntent;
60     private OverlayState mOverlayState;
61 
62     @Override
onCreate(Bundle savedInstanceState)63     public void onCreate(Bundle savedInstanceState) {
64         super.onCreate(savedInstanceState);
65 
66         Context context = getActivity();
67         mOverlayBridge = new AppStateOverlayBridge(context, mState, null);
68         mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
69 
70         // find preferences
71         addPreferencesFromResource(R.xml.app_ops_permissions_details);
72         mSwitchPref = (SwitchPreference) findPreference(KEY_APP_OPS_SETTINGS_SWITCH);
73         mOverlayPrefs = findPreference(KEY_APP_OPS_SETTINGS_PREFS);
74         mOverlayDesc = findPreference(KEY_APP_OPS_SETTINGS_DESC);
75 
76         // set title/summary for all of them
77         getPreferenceScreen().setTitle(R.string.draw_overlay);
78         mSwitchPref.setTitle(R.string.permit_draw_overlay);
79         mOverlayPrefs.setTitle(R.string.app_overlay_permission_preference);
80         mOverlayDesc.setSummary(R.string.allow_overlay_description);
81 
82         // install event listeners
83         mSwitchPref.setOnPreferenceChangeListener(this);
84         mOverlayPrefs.setOnPreferenceClickListener(this);
85 
86         mSettingsIntent = new Intent(Intent.ACTION_MAIN)
87                 .setAction(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
88     }
89 
90     @Override
onPreferenceClick(Preference preference)91     public boolean onPreferenceClick(Preference preference) {
92         if (preference == mOverlayPrefs) {
93             if (mSettingsIntent != null) {
94                 try {
95                     getActivity().startActivityAsUser(mSettingsIntent, new UserHandle(mUserId));
96                 } catch (ActivityNotFoundException e) {
97                     Log.w(LOG_TAG, "Unable to launch app draw overlay settings " + mSettingsIntent, e);
98                 }
99             }
100             return true;
101         }
102         return false;
103     }
104 
105     @Override
onPreferenceChange(Preference preference, Object newValue)106     public boolean onPreferenceChange(Preference preference, Object newValue) {
107         if (preference == mSwitchPref) {
108             if (mOverlayState != null && (Boolean) newValue != mOverlayState.isPermissible()) {
109                 setCanDrawOverlay(!mOverlayState.isPermissible());
110                 refreshUi();
111             }
112             return true;
113         }
114         return false;
115     }
116 
setCanDrawOverlay(boolean newState)117     private void setCanDrawOverlay(boolean newState) {
118         mAppOpsManager.setMode(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
119                 mPackageInfo.applicationInfo.uid, mPackageName, newState
120                 ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
121     }
122 
canDrawOverlay(String pkgName)123     private boolean canDrawOverlay(String pkgName) {
124         int result = mAppOpsManager.noteOpNoThrow(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
125                 mPackageInfo.applicationInfo.uid, pkgName);
126         if (result == AppOpsManager.MODE_ALLOWED) {
127             return true;
128         }
129 
130         return false;
131     }
132 
133     @Override
refreshUi()134     protected boolean refreshUi() {
135         mOverlayState = mOverlayBridge.getOverlayInfo(mPackageName,
136                 mPackageInfo.applicationInfo.uid);
137 
138         boolean isAllowed = mOverlayState.isPermissible();
139         mSwitchPref.setChecked(isAllowed);
140         // you cannot ask a user to grant you a permission you did not have!
141         mSwitchPref.setEnabled(mOverlayState.permissionDeclared);
142         mOverlayPrefs.setEnabled(isAllowed);
143         getPreferenceScreen().removePreference(mOverlayPrefs);
144 
145         return true;
146     }
147 
148     @Override
createDialog(int id, int errorCode)149     protected AlertDialog createDialog(int id, int errorCode) {
150         return null;
151     }
152 
153     @Override
getMetricsCategory()154     protected int getMetricsCategory() {
155         return MetricsEvent.SYSTEM_ALERT_WINDOW_APPS;
156     }
157 
getSummary(Context context, AppEntry entry)158     public static CharSequence getSummary(Context context, AppEntry entry) {
159         OverlayState state;
160         if (entry.extraInfo instanceof OverlayState) {
161             state = (OverlayState) entry.extraInfo;
162         } else if (entry.extraInfo instanceof PermissionState) {
163             state = new OverlayState((PermissionState) entry.extraInfo);
164         } else {
165             state = new AppStateOverlayBridge(context, null, null).getOverlayInfo(
166                     entry.info.packageName, entry.info.uid);
167         }
168 
169         return getSummary(context, state);
170     }
171 
getSummary(Context context, OverlayState overlayState)172     public static CharSequence getSummary(Context context, OverlayState overlayState) {
173         return context.getString(overlayState.isPermissible() ?
174             R.string.system_alert_window_on : R.string.system_alert_window_off);
175     }
176 
getSummary(Context context, String pkg)177     public static CharSequence getSummary(Context context, String pkg) {
178         // first check if pkg is a system pkg
179         PackageManager packageManager = context.getPackageManager();
180         int uid = -1;
181         try {
182             ApplicationInfo appInfo = packageManager.getApplicationInfo(pkg, 0);
183             uid = appInfo.uid;
184             if ((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
185                 return context.getString(R.string.system_alert_window_on);
186             }
187         } catch (PackageManager.NameNotFoundException e) {
188             // pkg doesn't even exist?
189             Log.w(LOG_TAG, "Package " + pkg + " not found", e);
190             return context.getString(R.string.system_alert_window_off);
191         }
192 
193         AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context
194                 .APP_OPS_SERVICE);
195         if (uid == -1) {
196             return context.getString(R.string.system_alert_window_off);
197         }
198 
199         int mode = appOpsManager.noteOpNoThrow(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, uid, pkg);
200         return context.getString((mode == AppOpsManager.MODE_ALLOWED) ?
201                 R.string.system_alert_window_on : R.string.system_alert_window_off);
202     }
203 }
204