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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// 导入所需的Android和Java类
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package net.micode.notes.ui;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.DialogInterface.OnClickListener;
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import android.content.DialogInterface.OnDismissListener;
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import android.content.Intent;
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import android.media.AudioManager;
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import android.media.MediaPlayer;
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import android.media.RingtoneManager;
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import android.net.Uri;
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import android.os.Bundle;
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import android.os.PowerManager;
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import android.provider.Settings;
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import android.view.Window;
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import android.view.WindowManager;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.tool.DataUtils;
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import java.io.IOException;
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// 声明AlarmAlertActivity类，继承自Activity，并实现OnClickListener和OnDismissListener接口
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public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
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// 声明成员变量
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private long mNoteId; // 笔记ID
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private String mSnippet; // 笔记摘要
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private static final int SNIPPET_PREW_MAX_LEN = 60; // 摘要最大长度
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MediaPlayer mPlayer; // 媒体播放器，用于播放闹钟声音
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// onCreate方法，Activity创建时调用
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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requestWindowFeature(Window.FEATURE_NO_TITLE); // 请求无标题窗口
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final Window win = getWindow(); // 获取当前窗口
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win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); // 允许在锁屏时显示
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// 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
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if (!isScreenOn()) {
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win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
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| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
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| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
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| WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
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}
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Intent intent = getIntent(); // 获取启动此Activity的Intent
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try {
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// 从Intent中提取笔记ID
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mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
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// 从数据库中获取笔记摘要
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mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
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// 如果摘要长度超过最大长度，则截断并添加省略号
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mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
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SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
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: mSnippet;
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} catch (IllegalArgumentException e) {
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e.printStackTrace(); // 捕获异常并打印堆栈跟踪
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return; // 如果发生异常，则退出方法
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}
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mPlayer = new MediaPlayer(); // 初始化媒体播放器
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// 检查笔记是否在数据库中且类型为普通笔记
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if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
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showActionDialog(); // 显示操作对话框
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playAlarmSound(); // 播放闹钟声音
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} else {
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finish(); // 如果笔记不存在，则结束Activity
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}
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}
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// 检查屏幕是否点亮
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private boolean isScreenOn() {
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PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
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return pm.isScreenOn();
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}
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// 播放闹钟声音
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private void playAlarmSound() {
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM); // 获取默认的闹钟铃声URI
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// 获取静音模式下受影响的音频流类型
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int silentModeStreams = Settings.System.getInt(getContentResolver(),
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Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
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// 根据静音模式设置音频流类型
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if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
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mPlayer.setAudioStreamType(silentModeStreams);
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} else {
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mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
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}
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try {
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// 设置媒体播放器的数据源并开始播放
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mPlayer.setDataSource(this, url);
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mPlayer.prepare();
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mPlayer.setLooping(true);
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mPlayer.start();
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} catch (IllegalArgumentException | SecurityException | IllegalStateException | IOException e) {
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e.printStackTrace(); // 捕获并打印各种异常
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}
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}
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// 显示操作对话框
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private void showActionDialog() {
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AlertDialog.Builder dialog = new AlertDialog.Builder(this); // 创建对话框构建器
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dialog.setTitle(R.string.app_name); // 设置对话框标题
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dialog.setMessage(mSnippet); // 设置对话框消息
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dialog.setPositiveButton(R.string.notealert_ok, this); // 设置正面按钮及其点击事件监听器
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if (isScreenOn()) {
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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
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}
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dialog.show().setOnDismissListener(this); // 显示对话框并设置其关闭事件监听器
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}
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// 点击对话框按钮时调用
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public void onClick(DialogInterface dialog, int which) {
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switch (which) {
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case DialogInterface.BUTTON_NEGATIVE: // 如果点击的是负面按钮
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Intent intent = new Intent(this, NoteEditActivity.class); // 创建跳转到NoteEditActivity的Intent
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intent.setAction(Intent.ACTION_VIEW); // 设置Intent动作为查看
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intent.putExtra(Intent.EXTRA_UID, mNoteId); // 将笔记ID作为额外数据添加到Intent中
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startActivity(intent); // 启动NoteEditActivity
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break;
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default:
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break;
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}
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}
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// 对话框关闭时调用
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public void onDismiss(DialogInterface dialog) {
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stopAlarmSound(); // 停止播放闹钟声音
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finish(); // 结束Activity
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}
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// 停止播放闹钟声音
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private void stopAlarmSound() {
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if (mPlayer != null) {
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mPlayer.stop(); // 停止媒体播放器
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mPlayer.release(); // 释放媒体播放器资源
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mPlayer = null; // 将媒体播放器引用置为空
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}
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}
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} |
