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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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// 220340038 毛彦翔 2024/4/14
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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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public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
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private long mNoteId; //便签在库中的检索ID
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private String mSnippet; //便签提醒时显示的文本
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private static final int SNIPPET_PREW_MAX_LEN = 60;
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MediaPlayer mPlayer;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);//通过savedInstanceState获取状态信息
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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//通过requestWindowFeature指定活动窗口的特性（无标题）
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final Window win = getWindow();
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/*
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*获取当前活动的window对象，并赋值给名为win的final变量
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*由于final变量 在赋值后不能再改变，
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*可以确保后续引用该变量时不会被意外修改 提高代码的可维护性
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*/
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win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
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//使window对象win可以在锁屏后仍然显示 即可以覆盖在锁屏界面之上
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if (!isScreenOn()) { //检查屏幕是否开启
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win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
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//保持屏幕唤醒 防止自动息屏
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| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
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//唤醒屏幕并显示窗口 不明白与66行保持屏幕唤醒的区别
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| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
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//允许屏幕在保持唤醒的情况下手动锁定屏幕 猜测与66行FLAG_KEEP_SCREEN_ON有关
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| WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
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//控制边距 确保布局和内容正常显示
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}
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Intent intent = getIntent();
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try {
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mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
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mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
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//通过检索ID从库中获取便签内容
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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();
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return;
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}//捕获异常信息 打印异常堆栈并直接返回 避免因错误信息导致程序崩溃
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mPlayer = new MediaPlayer(); //创建一个MediaPlayer对象用于播放音频
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if (DataUtils.visibleInNoteDatabase/*便签是否可见*/(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
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showActionDialog(); //笔记存在可见则显示操作对话框
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playAlarmSound(); //同时播放警示音
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} else {
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finish(); //笔记不存在或不可见则调用finish函数结束当前活动 关闭页面
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}
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}
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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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} //一个通过访问系统电源管理服务检查屏幕是否开启 并返回布尔值的私有方法
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private void playAlarmSound() {
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
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//获取当前默认铃声的uri并存储在Uri类型的变量url中 Uri是什么类型？写完再查
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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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//从系统设置中获取当前静音模式下受铃声模式影响的流的信息，并存储在一个整数变量中
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//作用是什么？没想明白
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if ((silentModeStreams/*处于静音模式*/ & (1 << AudioManager.STREAM_ALARM)) != 0) {
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mPlayer.setAudioStreamType(silentModeStreams);
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/*这下看懂了
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*使用位运算判断静音模式下是否受到铃声模式影响
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*与运算结果不为0则表示静音模式下受到铃声模式影响
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*受铃声模式影响则直接调用setAudioStreamType(silentModeStreams)设置音频流类型
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*/
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} else {
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mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
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} //否则使用AudioManager.STREAM_ALARM作为银趴留类型 总之 确保播放的铃声会受系统静音模式控制
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try {
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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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//设置MediaPlayer的数据源 准备播放铃声并循环播放 不一一注释了
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} catch (IllegalArgumentException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (SecurityException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IllegalStateException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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//用于捕获可能抛出的异常 发生以上异常则打印异常信息并继续执行
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//看不懂上面的注释 查找后发现是IDE自动生成的catch块
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}
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private void showActionDialog() { //显示操作对话框的私有方法
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AlertDialog.Builder dialog = new AlertDialog.Builder(this); //构建对话框 在当前活动窗口中显示
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dialog.setTitle(R.string.app_name); //设置对话框标题 文本来自app_name 这是什么
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dialog.setMessage(mSnippet); //对话框的内容 mSnippet在第46行被定义 这是什么来着
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dialog.setPositiveButton(R.string.notealert_ok, this); //某个按钮？没懂 positive按钮是什么
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if (isScreenOn()) {
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dialog.setNegativeButton(R.string.notealert_enter, this); //negative按钮又是什么 晕了 这俩玩意的功能写在哪了
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}
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dialog.show().setOnDismissListener(this); //头好痛 要长脑子了
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}
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DialogInterface.OnClickListener
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public void onClick(DialogInterface dialog, int which) { //对话框被点击时调用 DialogInterface.OnClickListener接口的实现
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switch (which) { // 用Switch分值判断哪个按钮被点击了 为什么不用if-else呢
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case DialogInterface.BUTTON_NEGATIVE: //negative按钮被按了!
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Intent intent = new Intent(this, NoteEditActivity.class); //新建intent对象 调用NoteEditActivity类
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intent.setAction(Intent.ACTION_VIEW); //把当前活动状态设置为action_view
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intent.putExtra(Intent.EXTRA_UID, mNoteId); //加了个什么东西 键为EXTRA_UID,值为mNoteID 检索ID?是把这对键值赋给新建的便签吗
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startActivity(intent); //启动。
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break;
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default: //按的不是negative按钮则停止活动 为什么startActivity按的是negative按钮不是positive按钮
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break;
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}
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}
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public void onDismiss(DialogInterface dialog) {
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stopAlarmSound();
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finish();
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} //最简单的一集 对话框消失则调用这两个函数 停止播放警示音并关闭当前活动
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private void stopAlarmSound() {
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if (mPlayer != null) { //就爱你差对象是否为空 是为了防止空指针吗
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mPlayer.stop();
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mPlayer.release(); //释放MediaPlayer使用的系统资源 避免资源浪费
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mPlayer = null; //将mPlayer设置为空 回收内存空间防止泄露
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}
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}
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}
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Gitea