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      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.launcher3;
     18 
     19 import android.app.Activity;
     20 import android.content.ContentResolver;
     21 import android.database.ContentObserver;
     22 import android.os.Bundle;
     23 import android.os.Handler;
     24 import android.preference.Preference;
     25 import android.preference.PreferenceFragment;
     26 import android.provider.Settings;
     27 import android.provider.Settings.System;
     28 
     29 /**
     30  * Settings activity for Launcher. Currently implements the following setting: Allow rotation
     31  */
     32 public class SettingsActivity extends Activity {
     33     @Override
     34     protected void onCreate(Bundle savedInstanceState) {
     35         super.onCreate(savedInstanceState);
     36 
     37         // Display the fragment as the main content.
     38         getFragmentManager().beginTransaction()
     39                 .replace(android.R.id.content, new LauncherSettingsFragment())
     40                 .commit();
     41     }
     42 
     43     /**
     44      * This fragment shows the launcher preferences.
     45      */
     46     public static class LauncherSettingsFragment extends PreferenceFragment {
     47 
     48         private SystemDisplayRotationLockObserver mRotationLockObserver;
     49 
     50         @Override
     51         public void onCreate(Bundle savedInstanceState) {
     52             super.onCreate(savedInstanceState);
     53             getPreferenceManager().setSharedPreferencesName(LauncherFiles.SHARED_PREFERENCES_KEY);
     54             addPreferencesFromResource(R.xml.launcher_preferences);
     55 
     56             // Setup allow rotation preference
     57             Preference rotationPref = findPreference(Utilities.ALLOW_ROTATION_PREFERENCE_KEY);
     58             if (getResources().getBoolean(R.bool.allow_rotation)) {
     59                 // Launcher supports rotation by default. No need to show this setting.
     60                 getPreferenceScreen().removePreference(rotationPref);
     61             } else {
     62                 ContentResolver resolver = getActivity().getContentResolver();
     63                 mRotationLockObserver = new SystemDisplayRotationLockObserver(rotationPref, resolver);
     64 
     65                 // Register a content observer to listen for system setting changes while
     66                 // this UI is active.
     67                 resolver.registerContentObserver(
     68                         Settings.System.getUriFor(System.ACCELEROMETER_ROTATION),
     69                         false, mRotationLockObserver);
     70 
     71                 // Initialize the UI once
     72                 mRotationLockObserver.onChange(true);
     73                 rotationPref.setDefaultValue(Utilities.getAllowRotationDefaultValue(getActivity()));
     74             }
     75         }
     76 
     77         @Override
     78         public void onDestroy() {
     79             if (mRotationLockObserver != null) {
     80                 getActivity().getContentResolver().unregisterContentObserver(mRotationLockObserver);
     81                 mRotationLockObserver = null;
     82             }
     83             super.onDestroy();
     84         }
     85     }
     86 
     87     /**
     88      * Content observer which listens for system auto-rotate setting changes, and enables/disables
     89      * the launcher rotation setting accordingly.
     90      */
     91     private static class SystemDisplayRotationLockObserver extends ContentObserver {
     92 
     93         private final Preference mRotationPref;
     94         private final ContentResolver mResolver;
     95 
     96         public SystemDisplayRotationLockObserver(
     97                 Preference rotationPref, ContentResolver resolver) {
     98             super(new Handler());
     99             mRotationPref = rotationPref;
    100             mResolver = resolver;
    101         }
    102 
    103         @Override
    104         public void onChange(boolean selfChange) {
    105             boolean enabled = Settings.System.getInt(mResolver,
    106                     Settings.System.ACCELEROMETER_ROTATION, 1) == 1;
    107             mRotationPref.setEnabled(enabled);
    108             mRotationPref.setSummary(enabled
    109                     ? R.string.allow_rotation_desc : R.string.allow_rotation_blocked_desc);
    110         }
    111     }
    112 }
    113