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@ -39,21 +39,34 @@ import net.micode.notes.tool.DataUtils;
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import java.io.IOException;
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/**
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* 闹钟提醒活动 - 处理笔记提醒的显示和响铃
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* 当笔记提醒时间到达时,此活动会显示提醒对话框并播放提醒音
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*/
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public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
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// 笔记ID和摘要内容
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private long mNoteId;
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private String mSnippet;
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// 摘要预览最大长度常量
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private static final int SNIPPET_PREW_MAX_LEN = 60;
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// 媒体播放器,用于播放提醒音
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MediaPlayer mPlayer;
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/**
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* 活动创建时调用
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* 设置窗口属性、解析意图数据、显示提醒对话框并播放提醒音
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*/
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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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// 请求无标题窗口
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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// 获取窗口并添加显示在锁屏上的标志
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final Window win = getWindow();
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win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
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// 如果屏幕未开启,则添加唤醒屏幕的标志
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if (!isScreenOn()) {
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win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
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| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
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@ -61,11 +74,14 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
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| WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
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}
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// 获取启动活动的意图
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Intent intent = getIntent();
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// 从意图数据中解析笔记ID和摘要
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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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// 如果摘要过长,则截断并添加省略号
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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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@ -74,7 +90,9 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
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return;
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}
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// 创建媒体播放器实例
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mPlayer = new MediaPlayer();
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// 检查笔记是否有效,如果有效则显示对话框并播放提醒音,否则关闭活动
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if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
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showActionDialog();
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playAlarmSound();
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@ -83,76 +101,108 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
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}
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}
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/**
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* 检查屏幕是否开启
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*/
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private boolean isScreenOn() {
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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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/**
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* 播放闹钟提醒音
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* 配置媒体播放器并播放默认闹钟铃声
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*/
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private void playAlarmSound() {
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// 获取默认闹钟铃声URI
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
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// 获取静音模式下受影响的音频流设置
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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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// 根据设置配置音频流类型
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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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// 配置并启动媒体播放器
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try {
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mPlayer.setDataSource(this, url);
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mPlayer.prepare();
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mPlayer.setLooping(true);
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mPlayer.setLooping(true); // 设置循环播放
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mPlayer.start();
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} catch (IllegalArgumentException e) {
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// TODO Auto-generated catch block
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// 异常处理:参数错误
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e.printStackTrace();
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} catch (SecurityException e) {
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// TODO Auto-generated catch block
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// 异常处理:安全权限问题
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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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// 异常处理:播放器状态错误
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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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// 异常处理:IO错误
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e.printStackTrace();
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}
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}
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/**
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* 显示提醒操作对话框
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* 包含笔记摘要和操作按钮
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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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dialog.setTitle(R.string.app_name);
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dialog.setMessage(mSnippet);
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dialog.setPositiveButton(R.string.notealert_ok, this);
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dialog.setTitle(R.string.app_name); // 设置对话框标题为应用名称
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dialog.setMessage(mSnippet); // 设置对话框内容为笔记摘要
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dialog.setPositiveButton(R.string.notealert_ok, this); // 添加"确定"按钮
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// 如果屏幕已开启,添加"进入"按钮用于打开笔记编辑界面
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if (isScreenOn()) {
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dialog.setNegativeButton(R.string.notealert_enter, this);
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}
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// 显示对话框并设置关闭监听器
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dialog.show().setOnDismissListener(this);
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}
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/**
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* 处理对话框按钮点击事件
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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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case DialogInterface.BUTTON_NEGATIVE:
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// "进入"按钮:打开笔记编辑界面
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Intent intent = new Intent(this, NoteEditActivity.class);
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intent.setAction(Intent.ACTION_VIEW);
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intent.putExtra(Intent.EXTRA_UID, mNoteId);
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startActivity(intent);
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break;
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default:
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// 默认情况(通常是"确定"按钮):不执行额外操作,对话框关闭时会停止铃声
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break;
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}
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}
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/**
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* 处理对话框关闭事件
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*/
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public void onDismiss(DialogInterface dialog) {
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// 停止闹钟声音并结束活动
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stopAlarmSound();
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finish();
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}
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/**
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* 停止闹钟声音并释放资源
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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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mPlayer.release();
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mPlayer = null;
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mPlayer.stop(); // 停止播放
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mPlayer.release(); // 释放资源
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mPlayer = null; // 置空引用,防止重复操作
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}
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}
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}
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