repeatpreference.java

Android app: AlartClock闹钟

/*
 * 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.alarmclock;

import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.preference.ListPreference;
import android.util.AttributeSet;

public class RepeatPreference extends ListPreference {

    private Alarms.DaysOfWeek mDaysOfWeek = new Alarms.DaysOfWeek();
    private OnRepeatChangedObserver mOnRepeatChangedObserver;

    public interface OnRepeatChangedObserver {
        /** RepeatPrefrence calls this to get initial state */
        public Alarms.DaysOfWeek getDaysOfWeek();

        /** Called when this preference has changed */
        public void onRepeatChanged(Alarms.DaysOfWeek daysOfWeek);
    }

    public RepeatPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    void setOnRepeatChangedObserver(OnRepeatChangedObserver onRepeatChangedObserver) {
        mOnRepeatChangedObserver = onRepeatChangedObserver;
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        if (positiveResult) {
            mOnRepeatChangedObserver.onRepeatChanged(mDaysOfWeek);
        } else {
            /* no change -- reset to initial state */
            mDaysOfWeek.set(mOnRepeatChangedObserver.getDaysOfWeek());
        }
    }

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {
        CharSequence[] entries = getEntries();
        CharSequence[] entryValues = getEntryValues();

        if (entries == null || entryValues == null) {
            throw new IllegalStateException(
                    "RepeatPreference requires an entries array and an entryValues array.");
        }

        mDaysOfWeek.set(mOnRepeatChangedObserver.getDaysOfWeek());

        builder.setMultiChoiceItems(
                entries, mDaysOfWeek.getBooleanArray(),
                new DialogInterface.OnMultiChoiceClickListener() {
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        mDaysOfWeek.set(which, isChecked);
                    }
                });
    }
}