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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.android.settings.webview;
     18 
     19 import android.content.Context;
     20 import android.content.pm.ApplicationInfo;
     21 import android.content.pm.PackageInfo;
     22 import android.content.pm.PackageManager;
     23 import android.os.RemoteException;
     24 import android.util.Log;
     25 import android.webkit.UserPackage;
     26 import android.webkit.WebViewFactory;
     27 import android.webkit.WebViewProviderInfo;
     28 import android.widget.Toast;
     29 
     30 import com.android.settings.R;
     31 
     32 import java.util.ArrayList;
     33 import java.util.List;
     34 
     35 public class WebViewUpdateServiceWrapper {
     36     private static final String TAG = "WVUSWrapper";
     37 
     38     public WebViewUpdateServiceWrapper() {
     39     }
     40 
     41     /**
     42      * Fetch the package currently used as WebView implementation.
     43      */
     44     public PackageInfo getCurrentWebViewPackage() {
     45         try {
     46             return WebViewFactory.getUpdateService().getCurrentWebViewPackage();
     47         } catch (RemoteException e) {
     48             Log.e(TAG, e.toString());
     49         }
     50         return null;
     51     }
     52 
     53     /**
     54      * Fetches ApplicationInfo objects for all currently valid WebView packages.
     55      * A WebView package is considered valid if it can be used as a WebView implementation. The
     56      * validity of a package is not dependent on whether the package is installed/enabled.
     57      */
     58     public List<ApplicationInfo> getValidWebViewApplicationInfos(Context context) {
     59         WebViewProviderInfo[] providers = null;
     60         try {
     61             providers = WebViewFactory.getUpdateService().getValidWebViewPackages();
     62         } catch (RemoteException e) {
     63         }
     64         List<ApplicationInfo> pkgs = new ArrayList<>();
     65         for (WebViewProviderInfo provider : providers) {
     66             try {
     67                 pkgs.add(context.getPackageManager().getApplicationInfo(
     68                         provider.packageName, PACKAGE_FLAGS));
     69             } catch (PackageManager.NameNotFoundException e) {
     70             }
     71         }
     72         return pkgs;
     73     }
     74 
     75     /**
     76      * Change WebView provider to {@param packageName}.
     77      *
     78      * @return whether the change succeeded.
     79      */
     80     public boolean setWebViewProvider(String packageName) {
     81         try {
     82             return packageName.equals(
     83                     WebViewFactory.getUpdateService().changeProviderAndSetting(packageName));
     84         } catch (RemoteException e) {
     85             Log.e(TAG, "RemoteException when trying to change provider to " + packageName, e);
     86         }
     87         return false;
     88     }
     89 
     90     /**
     91      * Fetch PackageInfos for the package named {@param packageName} for all users on the device.
     92      */
     93     public List<UserPackage> getPackageInfosAllUsers(Context context, String packageName) {
     94         return UserPackage.getPackageInfosAllUsers(context, packageName, PACKAGE_FLAGS);
     95     }
     96 
     97     /**
     98      * Show a toast to explain the chosen package can no longer be chosen.
     99      */
    100     public void showInvalidChoiceToast(Context context) {
    101         // The user chose a package that became invalid since the list was last updated,
    102         // show a Toast to explain the situation.
    103         Toast toast = Toast.makeText(context,
    104                 R.string.select_webview_provider_toast_text, Toast.LENGTH_SHORT);
    105         toast.show();
    106     }
    107 
    108     static final int PACKAGE_FLAGS = PackageManager.MATCH_ANY_USER;
    109 }
    110