qw-notes/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;


public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
    private long mNoteId;       // 当前便签ID
    private String mSnippet;    // 便签内容摘要
    private static final int SNIPPET_PREW_MAX_LEN = 60; // 摘要最大长度
    MediaPlayer mPlayer;        // 媒体播放器，用于播放警报音

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); // 隐藏标题栏

        // 设置窗口属性：锁屏时仍显示
        final Window win = getWindow();
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

        // 如果屏幕关闭，则唤醒屏幕
        if (!isScreenOn()) {
            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
        }

        // 从Intent获取便签ID和内容摘要
        Intent intent = getIntent();
        try {
            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
            // 截断过长的摘要
            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ?
                    mSnippet.substring(0, SNIPPET_PREW_MAX_LEN) + "..." : mSnippet;
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
            return;
        }

        // 初始化媒体播放器
        mPlayer = new MediaPlayer();
        // 检查便签是否有效
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
            showActionDialog(); // 显示提醒对话框
            playAlarmSound();   // 播放警报音
        } else {
            finish(); // 无效便签则结束活动
        }
    }

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

    /** 播放系统默认闹铃音 */
    private void playAlarmSound() {
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);

        // 根据系统设置调整音频流类型
        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
        mPlayer.setAudioStreamType((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0 ?
                silentModeStreams : AudioManager.STREAM_ALARM);

        try {
            mPlayer.setDataSource(this, url);
            mPlayer.prepare();
            mPlayer.setLooping(true); // 循环播放
            mPlayer.start();
        } catch (Exception e) {
            e.printStackTrace(); // 捕获并打印异常（如权限问题、文件无效等）
        }
    }

    /** 显示提醒操作对话框 */
    private void showActionDialog() {
        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        dialog.setTitle(R.string.app_name); // 标题为应用名称
        dialog.setMessage(mSnippet);       // 内容为便签摘要
        dialog.setPositiveButton(R.string.notealert_ok, this); // 确认按钮
        if (isScreenOn()) {
            dialog.setNegativeButton(R.string.notealert_enter, this); // 屏幕亮起时显示“进入”按钮
        }
        dialog.show().setOnDismissListener(this); // 设置对话框关闭监听
    }

    /** 对话框按钮点击事件 */
    public void onClick(DialogInterface dialog, int which) {
        if (which == DialogInterface.BUTTON_NEGATIVE) {
            // 点击“进入”按钮时跳转到便签编辑界面
            Intent intent = new Intent(this, NoteEditActivity.class);
            intent.setAction(Intent.ACTION_VIEW);
            intent.putExtra(Intent.EXTRA_UID, mNoteId);
            startActivity(intent);
        }
    }

    /** 对话框关闭时停止铃声并结束活动 */
    public void onDismiss(DialogInterface dialog) {
        stopAlarmSound();
        finish();
    }

    /** 停止播放警报音并释放资源 */
    private void stopAlarmSound() {
        if (mPlayer != null) {
            mPlayer.stop();
            mPlayer.release();
            mPlayer = null;
        }
    }
}