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      1 /*
      2  * Copyright (C) 2013 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;
     18 
     19 import java.util.ArrayList;
     20 import java.util.List;
     21 
     22 import android.app.Activity;
     23 import android.app.ActivityManager;
     24 import android.content.BroadcastReceiver;
     25 import android.content.ComponentName;
     26 import android.content.Context;
     27 import android.content.Intent;
     28 import android.content.IntentFilter;
     29 import android.content.SharedPreferences;
     30 import android.content.pm.ActivityInfo;
     31 import android.content.pm.ApplicationInfo;
     32 import android.content.pm.PackageInfo;
     33 import android.content.pm.PackageManager;
     34 import android.content.pm.ResolveInfo;
     35 import android.content.res.Resources;
     36 import android.content.pm.UserInfo;
     37 import android.graphics.ColorFilter;
     38 import android.graphics.ColorMatrix;
     39 import android.graphics.ColorMatrixColorFilter;
     40 import android.graphics.drawable.Drawable;
     41 import android.net.Uri;
     42 import android.os.Build;
     43 import android.os.Bundle;
     44 import android.os.Handler;
     45 import android.os.UserManager;
     46 import android.preference.Preference;
     47 import android.preference.PreferenceGroup;
     48 import android.text.TextUtils;
     49 import android.util.Log;
     50 import android.view.View;
     51 import android.view.View.OnClickListener;
     52 import android.widget.ImageView;
     53 import android.widget.RadioButton;
     54 import com.android.settings.search.BaseSearchIndexProvider;
     55 import com.android.settings.search.Index;
     56 import com.android.settings.search.Indexable;
     57 import com.android.settings.search.SearchIndexableRaw;
     58 
     59 public class HomeSettings extends SettingsPreferenceFragment implements Indexable {
     60     static final String TAG = "HomeSettings";
     61 
     62     // Boolean extra, indicates only launchers that support managed profiles should be shown.
     63     // Note: must match the constant defined in ManagedProvisioning
     64     private static final String EXTRA_SUPPORT_MANAGED_PROFILES = "support_managed_profiles";
     65 
     66     static final int REQUESTING_UNINSTALL = 10;
     67 
     68     public static final String HOME_PREFS = "home_prefs";
     69     public static final String HOME_PREFS_DO_SHOW = "do_show";
     70 
     71     public static final String HOME_SHOW_NOTICE = "show";
     72 
     73     private class HomePackageReceiver extends BroadcastReceiver {
     74         @Override
     75         public void onReceive(Context context, Intent intent) {
     76             buildHomeActivitiesList();
     77             Index.getInstance(context).updateFromClassNameResource(
     78                     HomeSettings.class.getName(), true, true);
     79         }
     80     }
     81 
     82     private PreferenceGroup mPrefGroup;
     83     private PackageManager mPm;
     84     private ComponentName[] mHomeComponentSet;
     85     private ArrayList<HomeAppPreference> mPrefs;
     86     private HomeAppPreference mCurrentHome = null;
     87     private final IntentFilter mHomeFilter;
     88     private boolean mShowNotice;
     89     private HomePackageReceiver mHomePackageReceiver = new HomePackageReceiver();
     90 
     91     public HomeSettings() {
     92         mHomeFilter = new IntentFilter(Intent.ACTION_MAIN);
     93         mHomeFilter.addCategory(Intent.CATEGORY_HOME);
     94         mHomeFilter.addCategory(Intent.CATEGORY_DEFAULT);
     95     }
     96 
     97     OnClickListener mHomeClickListener = new OnClickListener() {
     98         @Override
     99         public void onClick(View v) {
    100             int index = (Integer)v.getTag();
    101             HomeAppPreference pref = mPrefs.get(index);
    102             if (!pref.isChecked) {
    103                 makeCurrentHome(pref);
    104             }
    105         }
    106     };
    107 
    108     OnClickListener mDeleteClickListener = new OnClickListener() {
    109         @Override
    110         public void onClick(View v) {
    111             int index = (Integer)v.getTag();
    112             uninstallApp(mPrefs.get(index));
    113         }
    114     };
    115 
    116     void makeCurrentHome(HomeAppPreference newHome) {
    117         if (mCurrentHome != null) {
    118             mCurrentHome.setChecked(false);
    119         }
    120         newHome.setChecked(true);
    121         mCurrentHome = newHome;
    122 
    123         mPm.replacePreferredActivity(mHomeFilter, IntentFilter.MATCH_CATEGORY_EMPTY,
    124                 mHomeComponentSet, newHome.activityName);
    125 
    126         getActivity().setResult(Activity.RESULT_OK);
    127     }
    128 
    129     void uninstallApp(HomeAppPreference pref) {
    130         // Uninstallation is done by asking the OS to do it
    131        Uri packageURI = Uri.parse("package:" + pref.uninstallTarget);
    132        Intent uninstallIntent = new Intent(Intent.ACTION_UNINSTALL_PACKAGE, packageURI);
    133        uninstallIntent.putExtra(Intent.EXTRA_UNINSTALL_ALL_USERS, false);
    134        int requestCode = REQUESTING_UNINSTALL + (pref.isChecked ? 1 : 0);
    135        startActivityForResult(uninstallIntent, requestCode);
    136    }
    137 
    138     @Override
    139     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    140         super.onActivityResult(requestCode, resultCode, data);
    141 
    142         // Rebuild the list now that we might have nuked something
    143         buildHomeActivitiesList();
    144 
    145         // if the previous home app is now gone, fall back to the system one
    146         if (requestCode > REQUESTING_UNINSTALL) {
    147             // if mCurrentHome has gone null, it means we didn't find the previously-
    148             // default home app when rebuilding the list, i.e. it was the one we
    149             // just uninstalled.  When that happens we make the system-bundled
    150             // home app the active default.
    151             if (mCurrentHome == null) {
    152                 for (int i = 0; i < mPrefs.size(); i++) {
    153                     HomeAppPreference pref = mPrefs.get(i);
    154                     if (pref.isSystem) {
    155                         makeCurrentHome(pref);
    156                         break;
    157                     }
    158                 }
    159             }
    160         }
    161 
    162         // If we're down to just one possible home app, back out of this settings
    163         // fragment and show a dialog explaining to the user that they won't see
    164         // 'Home' settings now until such time as there are multiple available.
    165         if (mPrefs.size() < 2) {
    166             if (mShowNotice) {
    167                 mShowNotice = false;
    168                 SettingsActivity.requestHomeNotice();
    169             }
    170             finishFragment();
    171         }
    172     }
    173 
    174     private void buildHomeActivitiesList() {
    175         ArrayList<ResolveInfo> homeActivities = new ArrayList<ResolveInfo>();
    176         ComponentName currentDefaultHome  = mPm.getHomeActivities(homeActivities);
    177 
    178         Context context = getActivity();
    179         mCurrentHome = null;
    180         mPrefGroup.removeAll();
    181         mPrefs = new ArrayList<HomeAppPreference>();
    182         mHomeComponentSet = new ComponentName[homeActivities.size()];
    183         int prefIndex = 0;
    184         boolean supportManagedProfilesExtra =
    185                 getActivity().getIntent().getBooleanExtra(EXTRA_SUPPORT_MANAGED_PROFILES, false);
    186         boolean mustSupportManagedProfile = hasManagedProfile()
    187                 || supportManagedProfilesExtra;
    188         for (int i = 0; i < homeActivities.size(); i++) {
    189             final ResolveInfo candidate = homeActivities.get(i);
    190             final ActivityInfo info = candidate.activityInfo;
    191             ComponentName activityName = new ComponentName(info.packageName, info.name);
    192             mHomeComponentSet[i] = activityName;
    193             try {
    194                 Drawable icon = info.loadIcon(mPm);
    195                 CharSequence name = info.loadLabel(mPm);
    196                 HomeAppPreference pref;
    197 
    198                 if (mustSupportManagedProfile && !launcherHasManagedProfilesFeature(candidate)) {
    199                     pref = new HomeAppPreference(context, activityName, prefIndex,
    200                             icon, name, this, info, false /* not enabled */,
    201                             getResources().getString(R.string.home_work_profile_not_supported));
    202                 } else  {
    203                     pref = new HomeAppPreference(context, activityName, prefIndex,
    204                             icon, name, this, info, true /* enabled */, null);
    205                 }
    206 
    207                 mPrefs.add(pref);
    208                 mPrefGroup.addPreference(pref);
    209                 if (activityName.equals(currentDefaultHome)) {
    210                     mCurrentHome = pref;
    211                 }
    212                 prefIndex++;
    213             } catch (Exception e) {
    214                 Log.v(TAG, "Problem dealing with activity " + activityName, e);
    215             }
    216         }
    217 
    218         if (mCurrentHome != null) {
    219             if (mCurrentHome.isEnabled()) {
    220                 getActivity().setResult(Activity.RESULT_OK);
    221             }
    222 
    223             new Handler().post(new Runnable() {
    224                public void run() {
    225                    mCurrentHome.setChecked(true);
    226                }
    227             });
    228         }
    229     }
    230 
    231     private boolean hasManagedProfile() {
    232         Context context = getActivity();
    233         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
    234         List<UserInfo> profiles = userManager.getProfiles(context.getUserId());
    235         for (UserInfo userInfo : profiles) {
    236             if (userInfo.isManagedProfile()) return true;
    237         }
    238         return false;
    239     }
    240 
    241     private boolean launcherHasManagedProfilesFeature(ResolveInfo resolveInfo) {
    242         try {
    243             ApplicationInfo appInfo = getPackageManager().getApplicationInfo(
    244                     resolveInfo.activityInfo.packageName, 0 /* default flags */);
    245             return versionNumberAtLeastL(appInfo.targetSdkVersion);
    246         } catch (PackageManager.NameNotFoundException e) {
    247             return false;
    248         }
    249     }
    250 
    251     private boolean versionNumberAtLeastL(int versionNumber) {
    252         return versionNumber >= Build.VERSION_CODES.LOLLIPOP;
    253     }
    254 
    255     @Override
    256     public void onCreate(Bundle savedInstanceState) {
    257         super.onCreate(savedInstanceState);
    258         addPreferencesFromResource(R.xml.home_selection);
    259 
    260         mPm = getPackageManager();
    261         mPrefGroup = (PreferenceGroup) findPreference("home");
    262 
    263         Bundle args = getArguments();
    264         mShowNotice = (args != null) && args.getBoolean(HOME_SHOW_NOTICE, false);
    265     }
    266 
    267     @Override
    268     public void onResume() {
    269         super.onResume();
    270 
    271         final IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
    272         filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
    273         filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
    274         filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
    275         filter.addDataScheme("package");
    276         getActivity().registerReceiver(mHomePackageReceiver, filter);
    277 
    278         buildHomeActivitiesList();
    279     }
    280 
    281     @Override
    282     public void onPause() {
    283         super.onPause();
    284         getActivity().unregisterReceiver(mHomePackageReceiver);
    285     }
    286 
    287     private class HomeAppPreference extends Preference {
    288         ComponentName activityName;
    289         int index;
    290         HomeSettings fragment;
    291         final ColorFilter grayscaleFilter;
    292         boolean isChecked;
    293 
    294         boolean isSystem;
    295         String uninstallTarget;
    296 
    297         public HomeAppPreference(Context context, ComponentName activity,
    298                 int i, Drawable icon, CharSequence title, HomeSettings parent, ActivityInfo info,
    299                 boolean enabled, CharSequence summary) {
    300             super(context);
    301             setLayoutResource(R.layout.preference_home_app);
    302             setIcon(icon);
    303             setTitle(title);
    304             setEnabled(enabled);
    305             setSummary(summary);
    306             activityName = activity;
    307             fragment = parent;
    308             index = i;
    309 
    310             ColorMatrix colorMatrix = new ColorMatrix();
    311             colorMatrix.setSaturation(0f);
    312             float[] matrix = colorMatrix.getArray();
    313             matrix[18] = 0.5f;
    314             grayscaleFilter = new ColorMatrixColorFilter(colorMatrix);
    315 
    316             determineTargets(info);
    317         }
    318 
    319         // Check whether this activity is bundled on the system, with awareness
    320         // of the META_HOME_ALTERNATE mechanism.
    321         private void determineTargets(ActivityInfo info) {
    322             final Bundle meta = info.metaData;
    323             if (meta != null) {
    324                 final String altHomePackage = meta.getString(ActivityManager.META_HOME_ALTERNATE);
    325                 if (altHomePackage != null) {
    326                     try {
    327                         final int match = mPm.checkSignatures(info.packageName, altHomePackage);
    328                         if (match >= PackageManager.SIGNATURE_MATCH) {
    329                             PackageInfo altInfo = mPm.getPackageInfo(altHomePackage, 0);
    330                             final int altFlags = altInfo.applicationInfo.flags;
    331                             isSystem = (altFlags & ApplicationInfo.FLAG_SYSTEM) != 0;
    332                             uninstallTarget = altInfo.packageName;
    333                             return;
    334                         }
    335                     } catch (Exception e) {
    336                         // e.g. named alternate package not found during lookup
    337                         Log.w(TAG, "Unable to compare/resolve alternate", e);
    338                     }
    339                 }
    340             }
    341             // No suitable metadata redirect, so use the package's own info
    342             isSystem = (info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
    343             uninstallTarget = info.packageName;
    344         }
    345 
    346         @Override
    347         protected void onBindView(View view) {
    348             super.onBindView(view);
    349 
    350             RadioButton radio = (RadioButton) view.findViewById(R.id.home_radio);
    351             radio.setChecked(isChecked);
    352 
    353             Integer indexObj = new Integer(index);
    354 
    355             ImageView icon = (ImageView) view.findViewById(R.id.home_app_uninstall);
    356             if (isSystem) {
    357                 icon.setEnabled(false);
    358                 icon.setColorFilter(grayscaleFilter);
    359             } else {
    360                 icon.setEnabled(true);
    361                 icon.setOnClickListener(mDeleteClickListener);
    362                 icon.setTag(indexObj);
    363             }
    364 
    365             View v = view.findViewById(R.id.home_app_pref);
    366             v.setTag(indexObj);
    367 
    368             v.setOnClickListener(mHomeClickListener);
    369         }
    370 
    371         void setChecked(boolean state) {
    372             if (state != isChecked) {
    373                 isChecked = state;
    374                 notifyChanged();
    375             }
    376         }
    377     }
    378 
    379     /**
    380      * For search
    381      */
    382     public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
    383         new BaseSearchIndexProvider() {
    384             @Override
    385             public List<SearchIndexableRaw> getRawDataToIndex(Context context, boolean enabled) {
    386                 final List<SearchIndexableRaw> result = new ArrayList<SearchIndexableRaw>();
    387 
    388                 final PackageManager pm = context.getPackageManager();
    389                 final ArrayList<ResolveInfo> homeActivities = new ArrayList<ResolveInfo>();
    390                 pm.getHomeActivities(homeActivities);
    391 
    392                 final SharedPreferences sp = context.getSharedPreferences(
    393                         HomeSettings.HOME_PREFS, Context.MODE_PRIVATE);
    394                 final boolean doShowHome = sp.getBoolean(HomeSettings.HOME_PREFS_DO_SHOW, false);
    395 
    396                 // We index Home Launchers only if there are more than one or if we are showing the
    397                 // Home tile into the Dashboard
    398                 if (homeActivities.size() > 1 || doShowHome) {
    399                     final Resources res = context.getResources();
    400 
    401                     // Add fragment title
    402                     SearchIndexableRaw data = new SearchIndexableRaw(context);
    403                     data.title = res.getString(R.string.home_settings);
    404                     data.screenTitle = res.getString(R.string.home_settings);
    405                     data.keywords = res.getString(R.string.keywords_home);
    406                     result.add(data);
    407 
    408                     for (int i = 0; i < homeActivities.size(); i++) {
    409                         final ResolveInfo resolveInfo = homeActivities.get(i);
    410                         final ActivityInfo activityInfo = resolveInfo.activityInfo;
    411 
    412                         CharSequence name;
    413                         try {
    414                             name = activityInfo.loadLabel(pm);
    415                             if (TextUtils.isEmpty(name)) {
    416                                 continue;
    417                             }
    418                         } catch (Exception e) {
    419                             Log.v(TAG, "Problem dealing with Home " + activityInfo.name, e);
    420                             continue;
    421                         }
    422 
    423                         data = new SearchIndexableRaw(context);
    424                         data.title = name.toString();
    425                         data.screenTitle = res.getString(R.string.home_settings);
    426                         result.add(data);
    427                     }
    428                 }
    429 
    430                 return result;
    431             }
    432         };
    433 }
    434