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      1 /*
      2  * Copyright (C) 2016 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.inputmethod;
     18 
     19 import android.app.Activity;
     20 import android.app.admin.DevicePolicyManager;
     21 import android.content.Context;
     22 import android.graphics.Color;
     23 import android.graphics.drawable.ColorDrawable;
     24 import android.graphics.drawable.Drawable;
     25 import android.os.Bundle;
     26 import android.support.v7.preference.Preference;
     27 import android.view.inputmethod.InputMethodInfo;
     28 import android.view.inputmethod.InputMethodManager;
     29 
     30 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
     31 import com.android.internal.util.Preconditions;
     32 import com.android.settings.R;
     33 import com.android.settings.SettingsPreferenceFragment;
     34 import com.android.settings.search.BaseSearchIndexProvider;
     35 import com.android.settings.search.Indexable;
     36 import com.android.settings.search.SearchIndexableRaw;
     37 import com.android.settingslib.inputmethod.InputMethodAndSubtypeUtil;
     38 import com.android.settingslib.inputmethod.InputMethodPreference;
     39 
     40 import java.text.Collator;
     41 import java.util.ArrayList;
     42 import java.util.Collections;
     43 import java.util.Comparator;
     44 import java.util.List;
     45 
     46 public final class VirtualKeyboardFragment extends SettingsPreferenceFragment implements Indexable {
     47 
     48     private static final String ADD_VIRTUAL_KEYBOARD_SCREEN = "add_virtual_keyboard_screen";
     49     private static final Drawable NO_ICON = new ColorDrawable(Color.TRANSPARENT);
     50 
     51     private final ArrayList<InputMethodPreference> mInputMethodPreferenceList = new ArrayList<>();
     52     private InputMethodManager mImm;
     53     private DevicePolicyManager mDpm;
     54     private Preference mAddVirtualKeyboardScreen;
     55 
     56     @Override
     57     public void onCreatePreferences(Bundle bundle, String s) {
     58         Activity activity = Preconditions.checkNotNull(getActivity());
     59         addPreferencesFromResource(R.xml.virtual_keyboard_settings);
     60         mImm = Preconditions.checkNotNull(activity.getSystemService(InputMethodManager.class));
     61         mDpm = Preconditions.checkNotNull(activity.getSystemService(DevicePolicyManager.class));
     62         mAddVirtualKeyboardScreen = Preconditions.checkNotNull(
     63                 findPreference(ADD_VIRTUAL_KEYBOARD_SCREEN));
     64     }
     65 
     66     @Override
     67     public void onResume() {
     68         super.onResume();
     69         // Refresh internal states in mInputMethodSettingValues to keep the latest
     70         // "InputMethodInfo"s and "InputMethodSubtype"s
     71         updateInputMethodPreferenceViews();
     72     }
     73 
     74     @Override
     75     public int getMetricsCategory() {
     76         return MetricsEvent.VIRTUAL_KEYBOARDS;
     77     }
     78 
     79     private void updateInputMethodPreferenceViews() {
     80         // Clear existing "InputMethodPreference"s
     81         mInputMethodPreferenceList.clear();
     82         List<String> permittedList = mDpm.getPermittedInputMethodsForCurrentUser();
     83         final Context context = getPrefContext();
     84         final List<InputMethodInfo> imis = mImm.getEnabledInputMethodList();
     85         final int N = (imis == null ? 0 : imis.size());
     86         for (int i = 0; i < N; ++i) {
     87             final InputMethodInfo imi = imis.get(i);
     88             final boolean isAllowedByOrganization = permittedList == null
     89                     || permittedList.contains(imi.getPackageName());
     90             Drawable icon;
     91             try {
     92                 // TODO: Consider other ways to retrieve an icon to show here.
     93                 icon = getActivity().getPackageManager().getApplicationIcon(imi.getPackageName());
     94             } catch (Exception e) {
     95                 // TODO: Consider handling the error differently perhaps by showing default icons.
     96                 icon = NO_ICON;
     97             }
     98             final InputMethodPreference pref = new InputMethodPreference(
     99                     context,
    100                     imi,
    101                     false,  /* isImeEnabler */
    102                     isAllowedByOrganization,
    103                     null  /* this can be null since isImeEnabler is false */);
    104             pref.setIcon(icon);
    105             mInputMethodPreferenceList.add(pref);
    106         }
    107         final Collator collator = Collator.getInstance();
    108         mInputMethodPreferenceList.sort((lhs, rhs) -> lhs.compareTo(rhs, collator));
    109         getPreferenceScreen().removeAll();
    110         for (int i = 0; i < N; ++i) {
    111             final InputMethodPreference pref = mInputMethodPreferenceList.get(i);
    112             pref.setOrder(i);
    113             getPreferenceScreen().addPreference(pref);
    114             InputMethodAndSubtypeUtil.removeUnnecessaryNonPersistentPreference(pref);
    115             pref.updatePreferenceViews();
    116         }
    117         mAddVirtualKeyboardScreen.setIcon(R.drawable.ic_add_24dp);
    118         mAddVirtualKeyboardScreen.setOrder(N);
    119         getPreferenceScreen().addPreference(mAddVirtualKeyboardScreen);
    120     }
    121 
    122     public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
    123             new BaseSearchIndexProvider() {
    124         @Override
    125         public List<SearchIndexableRaw> getRawDataToIndex(Context context, boolean enabled) {
    126             final InputMethodManager imm = context.getSystemService(InputMethodManager.class);
    127             final List<InputMethodInfo> enabledInputMethods = imm.getEnabledInputMethodList();
    128             final String screenTitle = context.getString(R.string.virtual_keyboard_category);
    129             return AvailableVirtualKeyboardFragment
    130                     .buildSearchIndexOfInputMethods(context, enabledInputMethods, screenTitle);
    131         }
    132     };
    133 }
    134