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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.os.Bundle;
import android.os.Handler;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.provider.Settings;
import android.provider.Settings.System;
/**
* Settings activity for Launcher. Currently implements the following setting: Allow rotation
*/
public class SettingsActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Display the fragment as the main content.
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new LauncherSettingsFragment())
.commit();
}
/**
* This fragment shows the launcher preferences.
*/
public static class LauncherSettingsFragment extends PreferenceFragment {
private SystemDisplayRotationLockObserver mRotationLockObserver;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getPreferenceManager().setSharedPreferencesName(LauncherFiles.SHARED_PREFERENCES_KEY);
addPreferencesFromResource(R.xml.launcher_preferences);
// Setup allow rotation preference
Preference rotationPref = findPreference(Utilities.ALLOW_ROTATION_PREFERENCE_KEY);
if (getResources().getBoolean(R.bool.allow_rotation)) {
// Launcher supports rotation by default. No need to show this setting.
getPreferenceScreen().removePreference(rotationPref);
} else {
ContentResolver resolver = getActivity().getContentResolver();
mRotationLockObserver = new SystemDisplayRotationLockObserver(rotationPref, resolver);
// Register a content observer to listen for system setting changes while
// this UI is active.
resolver.registerContentObserver(
Settings.System.getUriFor(System.ACCELEROMETER_ROTATION),
false, mRotationLockObserver);
// Initialize the UI once
mRotationLockObserver.onChange(true);
rotationPref.setDefaultValue(Utilities.getAllowRotationDefaultValue(getActivity()));
}
}
@Override
public void onDestroy() {
if (mRotationLockObserver != null) {
getActivity().getContentResolver().unregisterContentObserver(mRotationLockObserver);
mRotationLockObserver = null;
}
super.onDestroy();
}
}
/**
* Content observer which listens for system auto-rotate setting changes, and enables/disables
* the launcher rotation setting accordingly.
*/
private static class SystemDisplayRotationLockObserver extends ContentObserver {
private final Preference mRotationPref;
private final ContentResolver mResolver;
public SystemDisplayRotationLockObserver(
Preference rotationPref, ContentResolver resolver) {
super(new Handler());
mRotationPref = rotationPref;
mResolver = resolver;
}
@Override
public void onChange(boolean selfChange) {
boolean enabled = Settings.System.getInt(mResolver,
Settings.System.ACCELEROMETER_ROTATION, 1) == 1;
mRotationPref.setEnabled(enabled);
mRotationPref.setSummary(enabled
? R.string.allow_rotation_desc : R.string.allow_rotation_blocked_desc);
}
}
}
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