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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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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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/*
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* AlarmAlertActivity 类用于处理提醒通知的界面和声音播放。
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* 当一个笔记的提醒时间到达时，这个活动会被启动，显示提醒信息并播放提醒声音。
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*/
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public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
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// 笔记的ID
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private long mNoteId;
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// 笔记内容的简短预览
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private String mSnippet;
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// 预览文本的最大长度
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private static final int SNIPPET_PREW_MAX_LEN = 60;
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// 用于播放提醒声音的MediaPlayer对象
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MediaPlayer mPlayer;
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/*
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* onCreate 方法初始化活动，设置窗口特性，根据传入的Intent获取笔记ID和简短内容，
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* 并根据情况显示对话框和播放声音。
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*/
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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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// 请求无标题的窗口
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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// 设置窗口在锁屏时也显示，并根据屏幕状态决定是否保持唤醒
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final Window win = getWindow();
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win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
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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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// 从Intent中获取笔记ID和简短内容
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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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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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}
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// 如果笔记在数据库中可见，则显示动作对话框并播放声音，否则结束活动
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mPlayer = new MediaPlayer();
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if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
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showActionDialog();
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playAlarmSound();
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} else {
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finish();
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}
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}
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/*
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* 检查屏幕是否处于打开状态。
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*
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* @return 如果屏幕已打开则返回true，否则返回false。
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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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}
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/*
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* 播放提醒声音。
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* 根据系统设置选择合适的音频流类型，并尝试播放选定的报警声音。
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*/
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private void playAlarmSound() {
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
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// 检查是否在静音模式下影响报警声音
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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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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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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 e) {
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e.printStackTrace();
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} catch (SecurityException e) {
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e.printStackTrace();
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} catch (IllegalStateException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/*
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* 显示动作对话框。
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* 根据屏幕是否打开，设置对话框的按钮，并显示应用名称和笔记的简短内容。
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*/
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private void showActionDialog() {
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AlertDialog.Builder dialog = new AlertDialog.Builder(this);
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dialog.setTitle(R.string.app_name);
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dialog.setMessage(mSnippet);
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dialog.setPositiveButton(R.string.notealert_ok, this);
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if (isScreenOn()) {
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dialog.setNegativeButton(R.string.notealert_enter, this);
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}
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dialog.show().setOnDismissListener(this);
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}
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/*
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* 点击对话框按钮的响应处理。
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* 根据点击的按钮启动编辑笔记的活动或结束当前活动。
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*/
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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:
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// 如果点击的是“进入”按钮，则启动笔记编辑活动
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Intent intent = new Intent(this, NoteEditActivity.class);
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intent.setAction(Intent.ACTION_VIEW);
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intent.putExtra(Intent.EXTRA_UID, mNoteId);
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startActivity(intent);
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break;
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default:
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// 关闭活动
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break;
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}
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}
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/*
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* 对话框关闭时的处理。
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* 停止播放提醒声音，结束当前活动。
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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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}
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/*
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* 停止播放提醒声音。
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* 如果MediaPlayer对象不为空，则停止播放并释放资源。
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*/
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private void stopAlarmSound() {
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if (mPlayer != null) {
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mPlayer.stop();
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mPlayer.release();
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mPlayer = null;
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}
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}
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}
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