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.annotations.VisibleForTesting; 35 import com.android.internal.logging.nano.MetricsProto.MetricsEvent; 36 import com.android.settings.R; 37 import com.android.settings.applications.AppStateAppOpsBridge.PermissionState; 38 import com.android.settings.applications.AppStateOverlayBridge.OverlayState; 39 import com.android.settings.core.TouchOverlayManager; 40 import com.android.settings.overlay.FeatureFactory; 41 import com.android.settingslib.applications.ApplicationsState.AppEntry; 42 43 public class DrawOverlayDetails extends AppInfoWithHeader implements OnPreferenceChangeListener, 44 OnPreferenceClickListener { 45 46 private static final String KEY_APP_OPS_SETTINGS_SWITCH = "app_ops_settings_switch"; 47 private static final String KEY_APP_OPS_SETTINGS_PREFS = "app_ops_settings_preference"; 48 private static final String KEY_APP_OPS_SETTINGS_DESC = "app_ops_settings_description"; 49 private static final String LOG_TAG = "DrawOverlayDetails"; 50 51 private static final int [] APP_OPS_OP_CODE = { 52 AppOpsManager.OP_SYSTEM_ALERT_WINDOW 53 }; 54 55 // Use a bridge to get the overlay details but don't initialize it to connect with all state. 56 // TODO: Break out this functionality into its own class. 57 private AppStateOverlayBridge mOverlayBridge; 58 private AppOpsManager mAppOpsManager; 59 private SwitchPreference mSwitchPref; 60 private Preference mOverlayPrefs; 61 private Preference mOverlayDesc; 62 private Intent mSettingsIntent; 63 private OverlayState mOverlayState; 64 65 private TouchOverlayManager mTouchOverlayManager; 66 67 @Override onCreate(Bundle savedInstanceState)68 public void onCreate(Bundle savedInstanceState) { 69 super.onCreate(savedInstanceState); 70 71 Context context = getActivity(); 72 mOverlayBridge = new AppStateOverlayBridge(context, mState, null); 73 mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE); 74 mTouchOverlayManager = new TouchOverlayManager(context); 75 76 // find preferences 77 addPreferencesFromResource(R.xml.app_ops_permissions_details); 78 mSwitchPref = (SwitchPreference) findPreference(KEY_APP_OPS_SETTINGS_SWITCH); 79 mOverlayPrefs = findPreference(KEY_APP_OPS_SETTINGS_PREFS); 80 mOverlayDesc = findPreference(KEY_APP_OPS_SETTINGS_DESC); 81 82 // set title/summary for all of them 83 getPreferenceScreen().setTitle(R.string.draw_overlay); 84 mSwitchPref.setTitle(R.string.permit_draw_overlay); 85 mOverlayPrefs.setTitle(R.string.app_overlay_permission_preference); 86 mOverlayDesc.setSummary(R.string.allow_overlay_description); 87 88 // install event listeners 89 mSwitchPref.setOnPreferenceChangeListener(this); 90 mOverlayPrefs.setOnPreferenceClickListener(this); 91 92 mSettingsIntent = new Intent(Intent.ACTION_MAIN) 93 .setAction(Settings.ACTION_MANAGE_OVERLAY_PERMISSION); 94 } 95 96 @Override onStart()97 public void onStart() { 98 super.onStart(); 99 100 mTouchOverlayManager.setOverlayAllowed(false); 101 } 102 103 @Override onStop()104 public void onStop() { 105 super.onStop(); 106 107 mTouchOverlayManager.setOverlayAllowed(true); 108 } 109 110 @Override onDestroy()111 public void onDestroy() { 112 super.onDestroy(); 113 mOverlayBridge.release(); 114 } 115 116 @Override onPreferenceClick(Preference preference)117 public boolean onPreferenceClick(Preference preference) { 118 if (preference == mOverlayPrefs) { 119 if (mSettingsIntent != null) { 120 try { 121 getActivity().startActivityAsUser(mSettingsIntent, new UserHandle(mUserId)); 122 } catch (ActivityNotFoundException e) { 123 Log.w(LOG_TAG, "Unable to launch app draw overlay settings " + mSettingsIntent, e); 124 } 125 } 126 return true; 127 } 128 return false; 129 } 130 131 @Override onPreferenceChange(Preference preference, Object newValue)132 public boolean onPreferenceChange(Preference preference, Object newValue) { 133 if (preference == mSwitchPref) { 134 if (mOverlayState != null && (Boolean) newValue != mOverlayState.isPermissible()) { 135 setCanDrawOverlay(!mOverlayState.isPermissible()); 136 refreshUi(); 137 } 138 return true; 139 } 140 return false; 141 } 142 setCanDrawOverlay(boolean newState)143 private void setCanDrawOverlay(boolean newState) { 144 logSpecialPermissionChange(newState, mPackageName); 145 mAppOpsManager.setMode(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, 146 mPackageInfo.applicationInfo.uid, mPackageName, newState 147 ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED); 148 } 149 150 @VisibleForTesting logSpecialPermissionChange(boolean newState, String packageName)151 void logSpecialPermissionChange(boolean newState, String packageName) { 152 int logCategory = newState ? MetricsEvent.APP_SPECIAL_PERMISSION_APPDRAW_ALLOW 153 : MetricsEvent.APP_SPECIAL_PERMISSION_APPDRAW_DENY; 154 FeatureFactory.getFactory(getContext()) 155 .getMetricsFeatureProvider().action(getContext(), logCategory, packageName); 156 } 157 canDrawOverlay(String pkgName)158 private boolean canDrawOverlay(String pkgName) { 159 int result = mAppOpsManager.noteOpNoThrow(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, 160 mPackageInfo.applicationInfo.uid, pkgName); 161 if (result == AppOpsManager.MODE_ALLOWED) { 162 return true; 163 } 164 165 return false; 166 } 167 168 @Override refreshUi()169 protected boolean refreshUi() { 170 mOverlayState = mOverlayBridge.getOverlayInfo(mPackageName, 171 mPackageInfo.applicationInfo.uid); 172 173 boolean isAllowed = mOverlayState.isPermissible(); 174 mSwitchPref.setChecked(isAllowed); 175 // you cannot ask a user to grant you a permission you did not have! 176 mSwitchPref.setEnabled(mOverlayState.permissionDeclared && mOverlayState.controlEnabled); 177 mOverlayPrefs.setEnabled(isAllowed); 178 getPreferenceScreen().removePreference(mOverlayPrefs); 179 180 return true; 181 } 182 183 @Override createDialog(int id, int errorCode)184 protected AlertDialog createDialog(int id, int errorCode) { 185 return null; 186 } 187 188 @Override getMetricsCategory()189 public int getMetricsCategory() { 190 return MetricsEvent.SYSTEM_ALERT_WINDOW_APPS; 191 } 192 getSummary(Context context, AppEntry entry)193 public static CharSequence getSummary(Context context, AppEntry entry) { 194 OverlayState state; 195 if (entry.extraInfo instanceof OverlayState) { 196 state = (OverlayState) entry.extraInfo; 197 } else if (entry.extraInfo instanceof PermissionState) { 198 state = new OverlayState((PermissionState) entry.extraInfo); 199 } else { 200 state = new AppStateOverlayBridge(context, null, null).getOverlayInfo( 201 entry.info.packageName, entry.info.uid); 202 } 203 204 return getSummary(context, state); 205 } 206 getSummary(Context context, OverlayState overlayState)207 public static CharSequence getSummary(Context context, OverlayState overlayState) { 208 return context.getString(overlayState.isPermissible() ? 209 R.string.system_alert_window_on : R.string.system_alert_window_off); 210 } 211 getSummary(Context context, String pkg)212 public static CharSequence getSummary(Context context, String pkg) { 213 // first check if pkg is a system pkg 214 PackageManager packageManager = context.getPackageManager(); 215 int uid = -1; 216 try { 217 ApplicationInfo appInfo = packageManager.getApplicationInfo(pkg, 0); 218 uid = appInfo.uid; 219 if ((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) { 220 return context.getString(R.string.system_alert_window_on); 221 } 222 } catch (PackageManager.NameNotFoundException e) { 223 // pkg doesn't even exist? 224 Log.w(LOG_TAG, "Package " + pkg + " not found", e); 225 return context.getString(R.string.system_alert_window_off); 226 } 227 228 AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context 229 .APP_OPS_SERVICE); 230 if (uid == -1) { 231 return context.getString(R.string.system_alert_window_off); 232 } 233 234 int mode = appOpsManager.noteOpNoThrow(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, uid, pkg); 235 return context.getString((mode == AppOpsManager.MODE_ALLOWED) ? 236 R.string.system_alert_window_on : R.string.system_alert_window_off); 237 } 238 } 239