/* * 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;//便签内容在数据库存储的ID private String mSnippet;//闹钟出现的内容 private static final int SNIPPET_PREW_MAX_LEN = 60; MediaPlayer mPlayer; @Override protected void onCreate(Bundle savedInstanceState) { /** * Bundle在Android开发中非常常见,它的作用主要时用于传递数据。 * Bundle传递的数据包括:string、int、boolean、byte、float、long、double等基本类型或它们对应的数组,也可以是对象或对象数组。 * 当Bundle传递的是对象或对象数组时,必须实现Serialiable或Parcelable接口。 */ super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); final Window win = getWindow(); win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); if (!isScreenOn()) { win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON//保持窗口常亮 | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON//点亮窗口 | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON//允许窗口点亮时锁屏 | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR); }//在手机锁屏时到了闹钟提示时间,打开手机屏幕 Intent intent = getIntent(); try { mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1)); mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);//根据ID从数据库中获取标签的内容 mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0, SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info) : mSnippet;//判断标签片段是否达到符合长度 } catch (IllegalArgumentException e) { e.printStackTrace(); return; } mPlayer = new MediaPlayer(); if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) { showActionDialog();//弹出对话框 playAlarmSound();//闹钟提示音 } else { finish();//闹钟完成 } } private boolean isScreenOn() {//判断屏幕是否锁屏,调用系统函数判断,最后返回值是boolean值(Ture或False) PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); return pm.isScreenOn(); } private void playAlarmSound() {//打开闹钟提示音 Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);//调用系统的铃声 int silentModeStreams = Settings.System.getInt(getContentResolver(), Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0); if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) { mPlayer.setAudioStreamType(silentModeStreams); } else { mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM); } try { mPlayer.setDataSource(this, url);//设置多媒体数据来源 mPlayer.prepare();//准备 mPlayer.setLooping(true);//设置是否循环播放 mPlayer.start();//开始播放 /** * MediaPlayer 类是媒体框架最重要的组成部分之一。 * 此类的对象能够获取、解码以及播放音频和视频,而且只需极少量设置。它支持多种不同的媒体源 * 比如本地资源、内部 URI,例如您可能从内容解析器那获取的 URI、外部网址(流式传输) */ } 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() { AlertDialog.Builder dialog = new AlertDialog.Builder(this); dialog.setTitle(R.string.app_name);//设置对话框的标题 dialog.setMessage(mSnippet);//设置对话框要传达的具体信息 dialog.setPositiveButton(R.string.notealert_ok, this);//设置确认按钮 if (isScreenOn()) { dialog.setNegativeButton(R.string.notealert_enter, this);//设置取消按钮 } dialog.show().setOnDismissListener(this); } /** * AlertDialog可以在当前的界面上显示一个对话框,这个对话框是置顶于所有界面元素之上的,能够屏蔽掉其他控件的交互能力,因此AlertDialog一般是用于提示一些非常重要的内容或者警告信息。 * 1.创建构造器AlertDialog.Builder的对象; * 2.通过构造器对象调用setTitle、setMessage、setIcon等方法构造对话框的标题、信息和图标等内容; * 3.根据需要调用setPositive/Negative/NeutralButton()方法设置正面按钮、负面按钮和中立按钮; * 4.调用构造器对象的create方法创建AlertDialog对象; * 5.AlertDialog对象调用show方法,让对话框在界面上显示。 */ public void onClick(DialogInterface dialog, int which) { switch (which) {//选择click后下一步的操作 case DialogInterface.BUTTON_NEGATIVE://取消 Intent intent = new Intent(this, NoteEditActivity.class);//两个类间的数据传输 intent.setAction(Intent.ACTION_VIEW);//动作属性 intent.putExtra(Intent.EXTRA_UID, mNoteId);//实现key-value对,EXTRA_UID为key,mNoteId为键 startActivity(intent);//开始 break; default: break; } } public void onDismiss(DialogInterface dialog) { stopAlarmSound();//暂停闹钟声音 finish(); } private void stopAlarmSound() { if (mPlayer != null) { mPlayer.stop();//停止播放 mPlayer.release();//释放MediaPlayer对象相关的资源 mPlayer = null; } } }