/* * 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. */ 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; public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener { private long mNoteId;//mNoteId可能是笔记的唯一标识符 private String mSnippet;//mSnippet可能是笔记的摘要或预览 private static final int SNIPPET_PREW_MAX_LEN = 60;//SNIPPET_PREW_MAX_LEN可能是规定的摘要或预览的最大长度,初值为60 MediaPlayer mPlayer;//定义了一个名为mPlayer的MediaPlayer对象 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);//调用父类的onCreate requestWindowFeature(Window.FEATURE_NO_TITLE);//请求窗口没有标题的特性 final Window win = getWindow(); win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);//获取当前窗口对象,并添加一个标志,以便在设备被锁定时显示该窗口 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); }//检查屏幕是否已经关闭,如果是,则设置一些标志来保持屏幕开启、打开屏幕并允许在屏幕开启时锁定屏幕,并将布局设置为插入装饰 Intent intent = getIntent(); try { mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1)); mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);//获取传入的意图并从中获取笔记ID,然后使用该ID从内容提供程序中获取笔记的摘录 mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0, SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info) : mSnippet;//如果摘录超过了预定义的最大长度,则将其截断并附加一些字符串,该代码将截断后的摘录分配给变量mSnippet } catch (IllegalArgumentException e) { e.printStackTrace(); return; }//从Intent中获取传递的数据,如果数据无效则抛出IllegalArgumentException异常并打印堆栈跟踪信息并返回 mPlayer = new MediaPlayer();//创建一个MediaPlayer对象 if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) { showActionDialog(); playAlarmSound(); }//检查当前笔记是否可见于笔记数据库,如果是,则显示操作对话框并播放警报声音 else { finish(); }//如果不是,结束当前活动 } private boolean isScreenOn() { PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);//获取 PowerManager 对象,然后调用其 isScreenOn() return pm.isScreenOn();//调用其 isScreenOn() 方法,返回当前屏幕是否开启的值 }//判断屏幕是否开启 private void playAlarmSound() {// 获取系统当前默认的闹钟铃声的Uri Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);// 获取当前静音模式下受影响的流 int silentModeStreams = Settings.System.getInt(getContentResolver(), Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);// 如果闹钟铃声所在的流也受到了静音模式的影响,则使用受影响的流 if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) { mPlayer.setAudioStreamType(silentModeStreams); } else { // 否则使用闹钟铃声所在的流 mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM); } try { // 设置闹钟铃声的Uri并准备播放 mPlayer.setDataSource(this, url); mPlayer.prepare(); // 循环播放闹钟铃声 mPlayer.setLooping(true); mPlayer.start(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void showActionDialog() { // 创建对话框构建器 AlertDialog.Builder dialog = new AlertDialog.Builder(this); // 设置对话框标题 dialog.setTitle(R.string.app_name); // 设置对话框消息内容 dialog.setMessage(mSnippet); // 设置对话框确定按钮文本和点击事件监听器 dialog.setPositiveButton(R.string.notealert_ok, this); // 如果屏幕是开启的,则设置对话框取消按钮文本和点击事件监听器 if (isScreenOn()) { dialog.setNegativeButton(R.string.notealert_enter, this); } // 显示对话框,并设置对话框消失监听器 dialog.show().setOnDismissListener(this); } public void onClick(DialogInterface dialog, int which) { switch (which) { // 当点击对话框的按钮时触发该方法 case DialogInterface.BUTTON_NEGATIVE:// 如果点击的是对话框的取消按钮 Intent intent = new Intent(this, NoteEditActivity.class);// 创建一个新的意图,指定跳转到NoteEditActivity类 intent.setAction(Intent.ACTION_VIEW); // 设置意图的操作为ACTION_VIEW intent.putExtra(Intent.EXTRA_UID, mNoteId);// 将笔记的ID作为额外的信息传递给NoteEditActivity类 startActivity(intent);// 启动NoteEditActivity类 break; default: // 如果点击的不是对话框的取消按钮,则结束 break; } } public void onDismiss(DialogInterface dialog) {// 当对话框消失时执行以下代码 stopAlarmSound();// 停止闹钟声音 finish(); // 结束当前Activity } private void stopAlarmSound() { if (mPlayer != null) {// 如果音频播放器不为空 mPlayer.stop();// 停止播放音频 mPlayer.release();// 释放音频播放器的资源 mPlayer = null;// 将音频播放器置为空 } } }