yzy_502/src/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;


public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
    private long mNoteId; // 闹钟提醒的便签ID
    private String mSnippet; // 便签的摘要信息
    private static final int SNIPPET_PREW_MAX_LEN = 60; // 便签摘要的最大长度
    MediaPlayer mPlayer; // 播放器对象

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); // 不显示标题栏

        final Window win = getWindow();
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); // 在锁屏界面上显示

        // 如果屏幕未点亮，则保持屏幕点亮，并在锁屏时允许解锁
        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 {
            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1)); // 从Intent中获取便签ID
            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId); // 根据便签ID获取便签摘要
            // 如果摘要长度超过限制，截取部分内容并添加提示信息
            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                    : mSnippet;
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
            return;
        }

        mPlayer = new MediaPlayer();
        // 如果便签在数据库中可见，则显示操作对话框并播放闹钟声音
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
            showActionDialog();
            playAlarmSound();
        } else {
            finish(); // 如果便签不可见，结束当前Activity
        }
    }

    // 检查屏幕是否点亮
    private boolean isScreenOn() {
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        return pm.isScreenOn();
    }
}


    private void playAlarmSound() {
        // 获取默认的警告铃声URI
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);

        // 获取静音模式下受影响的音频流
        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);

        // 检查是否静音模式影响了警告音频流
        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
            // 设置音频流类型为受静音模式影响的流类型
            mPlayer.setAudioStreamType(silentModeStreams);
        } else {
            // 设置音频流类型为警告音频流类型
            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        }

        try {
            // 设置音频源为警告铃声URI
            mPlayer.setDataSource(this, url);
            // 准备音频播放器
            mPlayer.prepare();
            // 设置循环播放
            mPlayer.setLooping(true);
            // 开始播放音频
            mPlayer.start();
        } catch (IllegalArgumentException e) {
            // 参数异常，打印堆栈轨迹
            e.printStackTrace();
        } catch (SecurityException e) {
            // 安全异常，打印堆栈轨迹
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // 状态异常，打印堆栈轨迹
            e.printStackTrace();
        } catch (IOException e) {
            // I/O异常，打印堆栈轨迹
            e.printStackTrace();
        }
    }

    private void showActionDialog() {
        // 创建警告对话框
        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);
        // 设置对话框积极按钮及点击事件处理者
        dialog.setPositiveButton(R.string.notealert_ok, this);

        // 检查屏幕是否打开，如果是则设置对话框消极按钮及点击事件处理者
        if (isScreenOn()) {
            dialog.setNegativeButton(R.string.notealert_enter, this);
        }

        // 显示对话框，并设置对话框关闭监听事件处理者
        dialog.show().setOnDismissListener(this);
    }


    public void onClick(DialogInterface dialog, int which) {
        // 按钮点击事件处理
        switch (which) {
            case DialogInterface.BUTTON_NEGATIVE:
                // 如果是消极按钮
                Intent intent = new Intent(this, NoteEditActivity.class);
                intent.setAction(Intent.ACTION_VIEW);
                intent.putExtra(Intent.EXTRA_UID, mNoteId);
                // 启动编辑笔记的活动
                startActivity(intent);
                break;
            default:
                break;
        }
    }

    public void onDismiss(DialogInterface dialog) {
        // 对话框关闭事件处理
        stopAlarmSound(); // 停止警报音
        finish(); // 结束当前活动
    }

    // 停止警报音
    private void stopAlarmSound() {
        if (mPlayer != null) {
            mPlayer.stop(); // 停止音频播放
            mPlayer.release(); // 释放资源
            mPlayer = null; // 将播放器置空
        }
    }

}