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/**
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* 闹钟提醒活动类,用于处理便签的闹钟提醒。
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*/
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public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
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// 便签ID
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private long mNoteId;
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// 便签摘要
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private String mSnippet;
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// 摘要预览的最大长度
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private static final int SNIPPET_PREW_MAX_LEN = 60;
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// 媒体播放器,用于播放闹钟声音
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MediaPlayer mPlayer;
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/**
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* 当活动创建时调用。
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* @param savedInstanceState 保存的实例状态
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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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// 请求无标题窗口特性
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requestWindowFeature(Window.FEATURE_NO_TITLE);
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// 获取窗口对象
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final Window win = getWindow();
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// 设置窗口在锁屏时显示
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win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
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// 检查屏幕是否开启,如果未开启则点亮屏幕并保持唤醒状态
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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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| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
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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Intent
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Intent intent = getIntent();
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try {
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// 从Intent中获取便签ID
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mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
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// 获取便签摘要
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mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
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// 如果摘要超过预览长度,则截断并添加提示
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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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} catch (IllegalArgumentException e) {
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e.printStackTrace();
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return;
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}
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// 创建媒体播放器
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mPlayer = new MediaPlayer();
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// 如果便签可见,则显示操作对话框并播放闹钟声音
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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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} else {
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// 如果便签不可见,则结束活动
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finish();
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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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* @return 如果屏幕开启返回true,否则返回false。
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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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* 播放闹钟声音。
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*/
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private void playAlarmSound() {
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// 获取默认闹钟铃声的Uri
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Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
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// 获取静音模式影响的流类型
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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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// 设置媒体播放器的音频流类型
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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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try {
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// 设置数据源并准备播放
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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.start();
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} catch (IllegalArgumentException e) {
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e.printStackTrace();
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} catch (SecurityException e) {
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e.printStackTrace();
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} catch (IllegalStateException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* 显示操作对话框。
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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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// 如果屏幕开启,则添加“进入”按钮
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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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dialog.show().setOnDismissListener(this);
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}
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/**
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* 点击对话框按钮时调用。
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* @param dialog 对话框
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* @param which 按钮类型
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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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// 启动便签编辑活动
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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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break;
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}
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}
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/**
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* 对话框消失时调用。
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* @param dialog 对话框
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*/
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public void onDismiss(DialogInterface dialog) {
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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。
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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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}
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}
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}
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