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/*
* Copyright (C) 2008 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.settings.bluetooth;
import com.android.settings.R;
import com.android.settings.bluetooth.LocalBluetoothManager.ExtendedBluetoothState;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.preference.Preference;
import android.preference.CheckBoxPreference;
import android.text.TextUtils;
import android.util.Config;
/**
* BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
* preference. It is turns on/off Bluetooth and ensures the summary of the
* preference reflects the current state.
*/
public class BluetoothEnabler implements Preference.OnPreferenceChangeListener {
private static final boolean LOCAL_LOGD = Config.LOGD || false;
private static final String TAG = "BluetoothEnabler";
private final Context mContext;
private final CheckBoxPreference mCheckBoxPreference;
private final CharSequence mOriginalSummary;
private final LocalBluetoothManager mLocalManager;
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
handleStateChanged(mLocalManager.getBluetoothState());
}
};
public BluetoothEnabler(Context context, CheckBoxPreference checkBoxPreference) {
mContext = context;
mCheckBoxPreference = checkBoxPreference;
mOriginalSummary = checkBoxPreference.getSummary();
checkBoxPreference.setPersistent(false);
mLocalManager = LocalBluetoothManager.getInstance(context);
if (mLocalManager == null) {
// Bluetooth not supported
checkBoxPreference.setEnabled(false);
}
}
public void resume() {
if (mLocalManager == null) {
return;
}
ExtendedBluetoothState state = mLocalManager.getBluetoothState();
// This is the widget enabled state, not the preference toggled state
mCheckBoxPreference.setEnabled(state == ExtendedBluetoothState.ENABLED ||
state == ExtendedBluetoothState.DISABLED);
// BT state is not a sticky broadcast, so set it manually
handleStateChanged(state);
mContext.registerReceiver(mReceiver,
new IntentFilter(LocalBluetoothManager.EXTENDED_BLUETOOTH_STATE_CHANGED_ACTION));
mCheckBoxPreference.setOnPreferenceChangeListener(this);
}
public void pause() {
if (mLocalManager == null) {
return;
}
mContext.unregisterReceiver(mReceiver);
mCheckBoxPreference.setOnPreferenceChangeListener(null);
}
public boolean onPreferenceChange(Preference preference, Object value) {
// Turn on/off BT
setEnabled((Boolean) value);
// Don't update UI to opposite state until we're sure
return false;
}
private void setEnabled(final boolean enable) {
// Disable preference
mCheckBoxPreference.setEnabled(false);
mLocalManager.setBluetoothEnabled(enable);
}
private void handleStateChanged(ExtendedBluetoothState state) {
if (state == ExtendedBluetoothState.DISABLED || state == ExtendedBluetoothState.ENABLED) {
mCheckBoxPreference.setChecked(state == ExtendedBluetoothState.ENABLED);
mCheckBoxPreference
.setSummary(state == ExtendedBluetoothState.DISABLED ? mOriginalSummary : null);
mCheckBoxPreference.setEnabled(isEnabledByDependency());
} else if (state == ExtendedBluetoothState.ENABLING ||
state == ExtendedBluetoothState.DISABLING) {
mCheckBoxPreference.setSummary(state == ExtendedBluetoothState.ENABLING
? R.string.wifi_starting
: R.string.wifi_stopping);
} else if (state == ExtendedBluetoothState.UNKNOWN) {
mCheckBoxPreference.setChecked(false);
mCheckBoxPreference.setSummary(R.string.wifi_error);
mCheckBoxPreference.setEnabled(true);
}
}
private boolean isEnabledByDependency() {
Preference dep = getDependencyPreference();
if (dep == null) {
return true;
}
return !dep.shouldDisableDependents();
}
private Preference getDependencyPreference() {
String depKey = mCheckBoxPreference.getDependency();
if (TextUtils.isEmpty(depKey)) {
return null;
}
return mCheckBoxPreference.getPreferenceManager().findPreference(depKey);
}
}
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