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      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.Manifest;
     19 import android.app.AppOpsManager;
     20 import android.content.Context;
     21 
     22 import com.android.settingslib.applications.ApplicationsState;
     23 import com.android.settingslib.applications.ApplicationsState.AppEntry;
     24 import com.android.settingslib.applications.ApplicationsState.AppFilter;
     25 
     26 /*
     27  * Connects info of apps that draw overlay to the ApplicationsState. Wraps around the generic
     28  * AppStateAppOpsBridge class to tailor to the semantics of SYSTEM_ALERT_WINDOW. Also provides app
     29  * filters that can use the info.
     30  */
     31 public class AppStateOverlayBridge extends AppStateAppOpsBridge {
     32 
     33     private static final String TAG = "AppStateOverlayBridge";
     34     private static final int APP_OPS_OP_CODE = AppOpsManager.OP_SYSTEM_ALERT_WINDOW;
     35     private static final String PM_SYSTEM_ALERT_WINDOW = Manifest.permission.SYSTEM_ALERT_WINDOW;
     36     private static final String[] PM_PERMISSION = {
     37             PM_SYSTEM_ALERT_WINDOW
     38     };
     39 
     40     public AppStateOverlayBridge(Context context, ApplicationsState appState, Callback callback) {
     41         super(context, appState, callback, APP_OPS_OP_CODE, PM_PERMISSION);
     42     }
     43 
     44     @Override
     45     protected void updateExtraInfo(AppEntry app, String pkg, int uid) {
     46         app.extraInfo = getOverlayInfo(pkg, uid);
     47     }
     48 
     49     public OverlayState getOverlayInfo(String pkg, int uid) {
     50         PermissionState permissionState = super.getPermissionInfo(pkg, uid);
     51         return new OverlayState(permissionState);
     52     }
     53 
     54     // TODO: figure out how to filter out system apps for this method
     55     public int getNumberOfPackagesWithPermission() {
     56         return super.getNumPackagesDeclaredPermission();
     57     }
     58 
     59     // TODO: figure out how to filter out system apps for this method
     60     public int getNumberOfPackagesCanDrawOverlay() {
     61         return super.getNumPackagesAllowedByAppOps();
     62     }
     63 
     64     public static class OverlayState extends AppStateAppOpsBridge.PermissionState {
     65 
     66         public OverlayState(PermissionState permissionState) {
     67             super(permissionState.packageName, permissionState.userHandle);
     68             this.packageInfo = permissionState.packageInfo;
     69             this.appOpMode = permissionState.appOpMode;
     70             this.permissionDeclared = permissionState.permissionDeclared;
     71             this.staticPermissionGranted = permissionState.staticPermissionGranted;
     72         }
     73     }
     74 
     75     public static final AppFilter FILTER_SYSTEM_ALERT_WINDOW = new AppFilter() {
     76         @Override
     77         public void init() {
     78         }
     79 
     80         @Override
     81         public boolean filterApp(AppEntry info) {
     82             return info.extraInfo != null;
     83         }
     84     };
     85 }
     86