MiNotes/app/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java

/*
 * 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;


@Override
protected void onCreate(Bundle savedInstanceState) {
        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
        | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
        | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
        | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
        }

        Intent intent = getIntent();

        try {
        // 获取传递过来的NoteId和Snippet
        mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
        mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
        // 处理提醒信息的文本长度和显示方式
        mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
        SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
        : mSnippet;// 如果文本过长则截取前60个字符，加上一个显示“…”的标识
        } catch (IllegalArgumentException e) {
        e.printStackTrace();
        return;
        }

        mPlayer = new MediaPlayer();
        // 从数据源中查询记录是否存在，如果存在则显示提醒菜单和播放提醒声音，否则结束Activity
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
        showActionDialog();// 显示提醒菜单
        playAlarmSound();// 播放提醒声音
        } else {
        finish();// Note不存在，结束Activity
        }
        }

private boolean isScreenOn() {// 检测屏幕是否点亮
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);// 获取PowerManager对象
        return pm.isScreenOn(); // 返回屏幕是否点亮的状态
        }

    private void playAlarmSound() {
        // 获取系统设置中的闹钟铃声
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
        // 获取当前系统模式下是否与闹钟声音相应
        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
        // 设置播放器的音频串流类型
        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
            mPlayer.setAudioStreamType(silentModeStreams);
        } else {
            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        }
        try {
        // 设置播放器的数据源
            mPlayer.setDataSource(this, url);
        // 缓冲播放器的媒体源数据
            mPlayer.prepare();
        // 设置播放器循环播放
            mPlayer.setLooping(true);
        // 播放闹钟声音
            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();
        }
    }

// 显示提醒菜单Dialog，包括Note的文本信息、确认键和选择键(如果屏幕是点亮的)
private void showActionDialog() {
        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        dialog.setTitle(R.string.app_name); // 设置Dialog的标题为应用名称
        dialog.setMessage(mSnippet); // 设置Dialog的信息为Note的文本信息
        dialog.setPositiveButton(R.string.notealert_ok, this); // 设置确认键，点击后执行onClick()方法
        if (isScreenOn()) { // 如果屏幕是点亮的，设置选择键 “进入笔记”， 点击后执行onClick()方法
        dialog.setNegativeButton(R.string.notealert_enter, this);
        }
        dialog.show().setOnDismissListener(this); // 显示Dialog，并设置当Dialog消失时的监听器
        }

// Dialog按键点击响应函数, which为点击的按键的序号
public void onClick(DialogInterface dialog, int which) {
        switch (which) {
        case DialogInterface.BUTTON_NEGATIVE: // 如果按下了选择键”进入笔记“
        Intent intent = new Intent(this, NoteEditActivity.class);
        intent.setAction(Intent.ACTION_VIEW);
        intent.putExtra(Intent.EXTRA_UID, mNoteId);
        startActivity(intent); // 打开Note编辑界面
        break;
default:
        break;
        }
        }

// 监听Dialog消失的响应函数
public void onDismiss(DialogInterface dialog) {
        stopAlarmSound(); // 停止播放闹钟声音
        finish(); // 结束Activity
        }

// 停止播放闹钟声音
private void stopAlarmSound() {
        if (mPlayer != null) { // 如果播放器存在
        mPlayer.stop(); // 停止播放
        mPlayer.release(); // 释放播放器占用的资源
        mPlayer = null; // 将播放器设为空
        }
        }