/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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.
 */

// 导入所需的Android和Java类

package net.micode.notes.ui;

 

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.content.DialogInterface.OnDismissListener;

import android.content.Intent;

import android.media.AudioManager;

import android.media.MediaPlayer;

import android.media.RingtoneManager;

import android.net.Uri;

import android.os.Bundle;

import android.os.PowerManager;

import android.provider.Settings;

import android.view.Window;

import android.view.WindowManager;

 

import net.micode.notes.R;

import net.micode.notes.data.Notes;

import net.micode.notes.tool.DataUtils;

 

import java.io.IOException;

 

// 声明AlarmAlertActivity类，继承自Activity，并实现OnClickListener和OnDismissListener接口

public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {

    // 声明成员变量

    private long mNoteId; // 笔记ID

    private String mSnippet; // 笔记摘要

    private static final int SNIPPET_PREW_MAX_LEN = 60; // 摘要最大长度

    MediaPlayer mPlayer; // 媒体播放器，用于播放闹钟声音

 

    // onCreate方法，Activity创建时调用

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE); // 请求无标题窗口

 

        final Window win = getWindow(); // 获取当前窗口

        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); // 允许在锁屏时显示

 

        // 如果屏幕未点亮，则添加一系列标志以点亮屏幕并保持其开启

        if (!isScreenOn()) {

            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON

                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON

                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON

                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);

        }

 

        Intent intent = getIntent(); // 获取启动此Activity的Intent

 

        try {

            // 从Intent中提取笔记ID

            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));

            // 从数据库中获取笔记摘要

            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);

            // 如果摘要长度超过最大长度，则截断并添加省略号

            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,

                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)

                    : mSnippet;

        } catch (IllegalArgumentException e) {

            e.printStackTrace(); // 捕获异常并打印堆栈跟踪

            return; // 如果发生异常，则退出方法

        }

 

        mPlayer = new MediaPlayer(); // 初始化媒体播放器

        // 检查笔记是否在数据库中且类型为普通笔记

        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {

            showActionDialog(); // 显示操作对话框

            playAlarmSound(); // 播放闹钟声音

        } else {

            finish(); // 如果笔记不存在，则结束Activity

        }

    }

 

    // 检查屏幕是否点亮

    private boolean isScreenOn() {

        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

        return pm.isScreenOn();

    }

 

    // 播放闹钟声音

    private void playAlarmSound() {

        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM); // 获取默认的闹钟铃声URI

 

        // 获取静音模式下受影响的音频流类型

        int silentModeStreams = Settings.System.getInt(getContentResolver(),

                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);

 

        // 根据静音模式设置音频流类型

        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {

            mPlayer.setAudioStreamType(silentModeStreams);

        } else {

            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);

        }

        try {

            // 设置媒体播放器的数据源并开始播放

            mPlayer.setDataSource(this, url);

            mPlayer.prepare();

            mPlayer.setLooping(true);

            mPlayer.start();

        } catch (IllegalArgumentException | SecurityException | IllegalStateException | IOException e) {

            e.printStackTrace(); // 捕获并打印各种异常

        }

    }

 

    // 显示操作对话框

    private void showActionDialog() {

        AlertDialog.Builder dialog = new AlertDialog.Builder(this); // 创建对话框构建器

        dialog.setTitle(R.string.app_name); // 设置对话框标题

        dialog.setMessage(mSnippet); // 设置对话框消息

        dialog.setPositiveButton(R.string.notealert_ok, this); // 设置正面按钮及其点击事件监听器

        if (isScreenOn()) {

            dialog.setNegativeButton(R.string.notealert_enter, this); // 如果屏幕点亮，则设置负面按钮及其点击事件监听器

        }

        dialog.show().setOnDismissListener(this); // 显示对话框并设置其关闭事件监听器

    }

 

    // 点击对话框按钮时调用

    public void onClick(DialogInterface dialog, int which) {

        switch (which) {

            case DialogInterface.BUTTON_NEGATIVE: // 如果点击的是负面按钮

                Intent intent = new Intent(this, NoteEditActivity.class); // 创建跳转到NoteEditActivity的Intent

                intent.setAction(Intent.ACTION_VIEW); // 设置Intent动作为查看

                intent.putExtra(Intent.EXTRA_UID, mNoteId); // 将笔记ID作为额外数据添加到Intent中

                startActivity(intent); // 启动NoteEditActivity

                break;

            default:

                break;

        }

    }

 

    // 对话框关闭时调用

    public void onDismiss(DialogInterface dialog) {

        stopAlarmSound(); // 停止播放闹钟声音

        finish(); // 结束Activity

    }

 

    // 停止播放闹钟声音

    private void stopAlarmSound() {

        if (mPlayer != null) {

            mPlayer.stop(); // 停止媒体播放器

            mPlayer.release(); // 释放媒体播放器资源

            mPlayer = null; // 将媒体播放器引用置为空

        }

    }

}