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 17 package com.android.tv.settings.device.apps; 18 19 import android.app.ActivityManager; 20 import android.content.Context; 21 import android.content.pm.PackageInfo; 22 import android.content.pm.PackageManager; 23 import android.content.pm.ResolveInfo; 24 import android.content.pm.Signature; 25 import android.os.Bundle; 26 import android.support.annotation.NonNull; 27 import android.support.v17.leanback.widget.GuidanceStylist; 28 import android.util.Log; 29 30 import com.android.settingslib.applications.ApplicationsState; 31 import com.android.tv.settings.R; 32 33 import java.util.ArrayList; 34 import java.util.HashSet; 35 import java.util.List; 36 37 public class EnableDisablePreference extends AppActionPreference { 38 private static final String TAG = "EnableDisablePreference"; 39 40 private static Signature sSystemSignature; 41 42 private final PackageManager mPackageManager; 43 EnableDisablePreference(Context context, ApplicationsState.AppEntry entry)44 public EnableDisablePreference(Context context, 45 ApplicationsState.AppEntry entry) { 46 super(context, entry); 47 mPackageManager = context.getPackageManager(); 48 refresh(); 49 } 50 refresh()51 public void refresh() { 52 if (!UninstallPreference.canUninstall(mEntry) && canDisable()) { 53 setVisible(true); 54 if (mEntry.info.enabled) { 55 setTitle(R.string.device_apps_app_management_disable); 56 ConfirmationFragment.prepareArgs(getExtras(), mEntry.info.packageName, false); 57 } else { 58 setTitle(R.string.device_apps_app_management_enable); 59 ConfirmationFragment.prepareArgs(getExtras(), mEntry.info.packageName, true); 60 } 61 } else { 62 setVisible(false); 63 } 64 } 65 canDisable()66 private boolean canDisable() { 67 final HashSet<String> homePackages = getHomePackages(); 68 PackageInfo packageInfo; 69 try { 70 packageInfo = mPackageManager.getPackageInfo(mEntry.info.packageName, 71 PackageManager.GET_DISABLED_COMPONENTS | 72 PackageManager.GET_UNINSTALLED_PACKAGES | 73 PackageManager.GET_SIGNATURES); 74 } catch (PackageManager.NameNotFoundException e) { 75 return false; 76 } 77 return !(homePackages.contains(mEntry.info.packageName) || 78 isSystemPackage(mPackageManager, packageInfo)); 79 } 80 getHomePackages()81 private HashSet<String> getHomePackages() { 82 HashSet<String> homePackages = new HashSet<>(); 83 // Get list of "home" apps and trace through any meta-data references 84 List<ResolveInfo> homeActivities = new ArrayList<>(); 85 mPackageManager.getHomeActivities(homeActivities); 86 for (ResolveInfo ri : homeActivities) { 87 final String activityPkg = ri.activityInfo.packageName; 88 homePackages.add(activityPkg); 89 // Also make sure to include anything proxying for the home app 90 final Bundle metadata = ri.activityInfo.metaData; 91 if (metadata != null) { 92 final String metaPkg = metadata.getString(ActivityManager.META_HOME_ALTERNATE); 93 if (signaturesMatch(mPackageManager, metaPkg, activityPkg)) { 94 homePackages.add(metaPkg); 95 } 96 } 97 } 98 return homePackages; 99 } 100 signaturesMatch(PackageManager pm, String pkg1, String pkg2)101 private static boolean signaturesMatch(PackageManager pm, String pkg1, String pkg2) { 102 if (pkg1 != null && pkg2 != null) { 103 try { 104 final int match = pm.checkSignatures(pkg1, pkg2); 105 if (match >= PackageManager.SIGNATURE_MATCH) { 106 return true; 107 } 108 } catch (Exception e) { 109 // e.g. named alternate package not found during lookup; 110 // this is an expected case sometimes 111 } 112 } 113 return false; 114 } 115 116 /** 117 * Determine whether a package is a "system package", in which case certain things (like 118 * disabling notifications or disabling the package altogether) should be disallowed. 119 */ isSystemPackage(PackageManager pm, PackageInfo pkg)120 private static boolean isSystemPackage(PackageManager pm, PackageInfo pkg) { 121 if (sSystemSignature == null) { 122 try { 123 final PackageInfo sys = pm.getPackageInfo("android", PackageManager.GET_SIGNATURES); 124 sSystemSignature = getFirstSignature(sys); 125 } catch (PackageManager.NameNotFoundException e) { 126 Log.e(TAG, "Could not look up system signature", e); 127 } 128 } 129 return sSystemSignature != null && sSystemSignature.equals(getFirstSignature(pkg)); 130 } 131 getFirstSignature(PackageInfo pkg)132 private static Signature getFirstSignature(PackageInfo pkg) { 133 if (pkg != null && pkg.signatures != null && pkg.signatures.length > 0) { 134 return pkg.signatures[0]; 135 } 136 return null; 137 } 138 139 @Override getFragment()140 public String getFragment() { 141 return ConfirmationFragment.class.getName(); 142 } 143 144 public static class ConfirmationFragment extends AppActionPreference.ConfirmationFragment { 145 private static final String ARG_PACKAGE_NAME = "packageName"; 146 private static final String ARG_ENABLE = "enable"; 147 prepareArgs(@onNull Bundle args, String packageName, boolean enable)148 private static void prepareArgs(@NonNull Bundle args, String packageName, boolean enable) { 149 args.putString(ARG_PACKAGE_NAME, packageName); 150 args.putBoolean(ARG_ENABLE, enable); 151 } 152 153 @NonNull 154 @Override onCreateGuidance(Bundle savedInstanceState)155 public GuidanceStylist.Guidance onCreateGuidance(Bundle savedInstanceState) { 156 final AppManagementFragment fragment = (AppManagementFragment) getTargetFragment(); 157 final Boolean enable = getArguments().getBoolean(ARG_ENABLE); 158 return new GuidanceStylist.Guidance( 159 getString(enable ? R.string.device_apps_app_management_enable : 160 R.string.device_apps_app_management_disable), 161 getString(enable ? R.string.device_apps_app_management_enable_desc : 162 R.string.device_apps_app_management_disable_desc), 163 fragment.getAppName(), 164 fragment.getAppIcon()); 165 } 166 167 @Override onOk()168 public void onOk() { 169 getActivity().getPackageManager().setApplicationEnabledSetting( 170 getArguments().getString(ARG_PACKAGE_NAME), 171 getArguments().getBoolean(ARG_ENABLE) ? 172 PackageManager.COMPONENT_ENABLED_STATE_DEFAULT : 173 PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER, 174 0); 175 } 176 } 177 } 178