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      1 /*
      2  * Copyright (C) 2017 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 
     17 package com.google.android.tv.partner.support;
     18 
     19 import android.annotation.TargetApi;
     20 import android.content.Context;
     21 import android.content.pm.PackageInfo;
     22 import android.content.pm.PackageManager;
     23 import android.content.res.Resources;
     24 import android.os.Build;
     25 import android.util.Log;
     26 import java.util.Arrays;
     27 import java.util.List;
     28 import java.util.Optional;
     29 
     30 /**
     31  * Abstract class for TV Customization support.
     32  *
     33  * <p>Implement customization resources as needed in a child class.
     34  */
     35 @TargetApi(Build.VERSION_CODES.N)
     36 @SuppressWarnings("AndroidApiChecker") // TODO(b/32513850) remove when error prone is updated
     37 public class BaseCustomization {
     38     private static final boolean DEBUG = false;
     39     private static final String TAG = "BaseCustomization";
     40 
     41     // TODO move common aosp library
     42 
     43     // TODO cache resource if performance suffers.
     44 
     45     private static final String RES_TYPE_BOOLEAN = "bool";
     46 
     47     private final String packageName;
     48 
     49     protected BaseCustomization(Context context, String[] permissions) {
     50         packageName = getFirstPackageNameWithPermissions(context, permissions);
     51     }
     52 
     53     public final String getPackageName() {
     54         return packageName;
     55     }
     56 
     57     private static String getFirstPackageNameWithPermissions(
     58             Context context, String[] permissions) {
     59 
     60         List<PackageInfo> packageInfos =
     61                 context.getPackageManager().getPackagesHoldingPermissions(permissions, 0);
     62         if (DEBUG) {
     63             Log.d(TAG, "These packages have " + Arrays.toString(permissions) + ": " + packageInfos);
     64         }
     65         return packageInfos == null || packageInfos.size() == 0
     66                 ? ""
     67                 : packageInfos.get(0).packageName;
     68     }
     69 
     70     private static Resources getResourceForPackage(Context context, String packageName)
     71             throws PackageManager.NameNotFoundException {
     72         return context.getPackageManager().getResourcesForApplication(packageName);
     73     }
     74 
     75     public final Optional<Boolean> getBooleanResource(Context context, String resourceName) {
     76         if (resourceName.isEmpty()) {
     77             return Optional.empty();
     78         }
     79         try {
     80             Resources res = getResourceForPackage(context, packageName);
     81             int resId =
     82                     res == null
     83                             ? 0
     84                             : res.getIdentifier(resourceName, RES_TYPE_BOOLEAN, packageName);
     85             if (DEBUG) {
     86                 Log.d(TAG, "Boolean resource  " + resourceName + " has  " + resId);
     87             }
     88             return resId == 0 ? Optional.empty() : Optional.of(res.getBoolean(resId));
     89         } catch (PackageManager.NameNotFoundException e) {
     90             return Optional.empty();
     91         }
     92     }
     93 }
     94