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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;//定义一个名为net.micode.notes.ui的包
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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; //文本在数据库存储中的ID号
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private String mSnippet;//闹钟提示时出现的文本片段
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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);
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//Bundle类型的数据与Map类型的数据相似，都是以key-value的形式存储数据的
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//onsaveInstanceState方法是用来保存Activity的状态的
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//能从onCreate的参数savedInsanceState中获得状态数据
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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//界面显示——无标题
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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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//保持窗体点亮
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| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
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//将窗体点亮
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| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
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//允许窗体点亮时锁屏
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| WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
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}//在手机锁屏后如果到了闹钟提示时间，点亮屏幕
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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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//根据ID从数据库中获取标签的内容；
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//getContentResolver（）是实现数据共享，实例存储。
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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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//判断标签片段是否达到符合长度
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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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/*
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try
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{
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// 代码区
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}
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catch(Exception e)
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{
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// 异常处理
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}
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代码区如果有错误，就会返回所写异常的处理。*/
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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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//弹出对话框
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playAlarmSound();
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//闹钟提示音激发
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} else {
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finish();
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//完成闹钟动作
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}
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}
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private boolean isScreenOn() {
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//判断屏幕是否锁屏，调用系统函数判断，最后返回值是布尔类型
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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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private void playAlarmSound() {
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//闹钟提示音激发
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
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//调用系统的铃声管理URI，得到闹钟提示音
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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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//方法：setDataSource(Context context, Uri uri)
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//解释：无返回值，设置多媒体数据来源【根据 Uri】
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mPlayer.prepare();
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//准备同步
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mPlayer.setLooping(true);
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//设置是否循环播放
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mPlayer.start();
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//开始播放
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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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//e.printStackTrace()函数功能是抛出异常， 还将显示出更深的调用信息
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//System.out.println(e)，这个方法打印出异常，并且输出在哪里出现的异常
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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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}
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private void showActionDialog() {
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AlertDialog.Builder dialog = new AlertDialog.Builder(this);
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//AlertDialog的构造方法全部是Protected的
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//所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。
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//要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法
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//如这里的dialog就是新建了一个AlertDialog
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dialog.setTitle(R.string.app_name);
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//为对话框设置标题
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dialog.setMessage(mSnippet);
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//为对话框设置内容
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dialog.setPositiveButton(R.string.notealert_ok, this);
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//给对话框添加"Yes"按钮
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if (isScreenOn()) {
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dialog.setNegativeButton(R.string.notealert_enter, this);
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}//对话框添加"No"按钮
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dialog.show().setOnDismissListener(this);
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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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//用which来选择click后下一步的操作
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case DialogInterface.BUTTON_NEGATIVE:
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//这是取消操作
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Intent intent = new Intent(this, NoteEditActivity.class);
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//实现两个类间的数据传输
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intent.setAction(Intent.ACTION_VIEW);
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//设置动作属性
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intent.putExtra(Intent.EXTRA_UID, mNoteId);
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//实现key-value对
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//EXTRA_UID为key；mNoteId为键
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startActivity(intent);
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//开始动作
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break;
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default:
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//这是确定操作
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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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//忽略
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stopAlarmSound();
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//停止闹钟声音
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finish();
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//完成该动作
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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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//停止播放
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mPlayer.release();
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//释放MediaPlayer对象
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mPlayer = null;
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}
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}
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}
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