minote/other/07_210340179张硕-代码标注/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;//活动
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;//导入安卓媒体音频管理器
import android.media.MediaPlayer;//导入安卓媒体媒体播放器
import android.media.RingtoneManager;//导入安卓媒体铃声管理器
import android.net.Uri;//导入安卓网
import android.os.Bundle;//导入安卓捆绑包
import android.os.PowerManager;//导入安卓系统
import android.provider.Settings;
import android.view.Window;//导入安卓视图窗口管理器
import android.view.WindowManager;//导入安卓视图窗口管理器

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 {//单击，关闭时操作
    private long mNoteId; //文本在数据库存储中的ID号
    private String mSnippet;//闹钟提示时出现的文本片段
    private static final int SNIPPET_PREW_MAX_LEN = 60;//闹钟最大持续时间
    MediaPlayer mPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {//onsaveInstanceState方法是用来保存Activity的状态的
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);//界面显示

        final Window win = getWindow();
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

        if (!isScreenOn()) {
            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON//保持窗体点亮
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON//将窗体点亮
                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON//允许窗体点亮时锁屏
                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);//在手机锁屏后如果到了闹钟提示时间，点亮屏幕
        }

        Intent intent = getIntent();

        try {
            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));//根据ID从数据库中获取所需标签的内容
            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                    : mSnippet;//进行判断，标签片段是否达到符合长度
        } catch (IllegalArgumentException e) {//非法参数异常捕获
            e.printStackTrace();
            return;
        }

        mPlayer = new MediaPlayer();
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
            showActionDialog();//弹出对话框
            playAlarmSound();//闹钟提示音
        } else {
            finish();//闹钟动作完成
        }
    }

    private boolean isScreenOn() {//锁屏判断
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        return pm.isScreenOn();
    }

    private void playAlarmSound() {//闹钟提示音激发
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);//调用系统的铃声

        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);

        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {//静音模式判断
            mPlayer.setAudioStreamType(silentModeStreams);
        } else {
            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        }
        try {
            mPlayer.setDataSource(this, url);//设置多媒体数据来源
            mPlayer.prepare();//准备同步
            mPlayer.setLooping(true);//设置是否循环播放
            mPlayer.start();//播放开始
        } catch (IllegalArgumentException e) {//跑车异常
            // 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();
        }
    }

    private void showActionDialog() {
        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        dialog.setTitle(R.string.app_name);//为对话框设置标题
        dialog.setMessage(mSnippet);//为对话框设置内容
        dialog.setPositiveButton(R.string.notealert_ok, this);//yes按钮的设置
        if (isScreenOn()) {
            dialog.setNegativeButton(R.string.notealert_enter, this);//no按钮的设置
        }
        dialog.show().setOnDismissListener(this);
    }

    public void onClick(DialogInterface dialog, int which) {
        switch (which) {//用which来选择click后下一步的操作
            case DialogInterface.BUTTON_NEGATIVE://取消操作
                Intent intent = new Intent(this, NoteEditActivity.class);
                intent.setAction(Intent.ACTION_VIEW);//设置动作属性
                intent.putExtra(Intent.EXTRA_UID, mNoteId);
                startActivity(intent);//动作开始
                break;
            default://确定操作
                break;
        }
    }

    public void onDismiss(DialogInterface dialog) {//忽略闹钟时操作
        stopAlarmSound(); //停止闹钟声音
        finish();
    }

    private void stopAlarmSound() {//闹钟音乐停止时操作
        if (mPlayer != null) {
            mPlayer.stop();//停止播放
            mPlayer.release();//释放对象
            mPlayer = null;
        }
    }
}