V2.0

java/net/micode/notes/tool/BackupUtils.java

@@ -39,10 +39,15 @@ import java.io.PrintStream;
 public class BackupUtils {
     private static final String TAG = "BackupUtils";
     // Singleton stuff
-    private static BackupUtils sInstance;
+    private static BackupUtils sInstance;//类里面为什么可以定义自身类的对象？
 
     public static synchronized BackupUtils getInstance(Context context) {
+        //ynchronized 关键字，代表这个方法加锁,相当于不管哪一个线程（例如线程A）
+        //运行到这个方法时,都要检查有没有其它线程B（或者C、 D等）正在用这个方法(或者该类的其他同步方法)，有的话要等正在使用synchronized方法的线程B（或者C 、D）运行完这个方法后再运行此线程A,没有的话,锁定调用者,然后直接运行。
+        //它包括两种用法：synchronized 方法和 synchronized 块。
+
         if (sInstance == null) {
+            //如果当前备份不存在，则新声明一个
             sInstance = new BackupUtils(context);
         }
         return sInstance;
@@ -65,10 +70,12 @@ public class BackupUtils {
 
     private TextExport mTextExport;
 
+    //初始化函数
     private BackupUtils(Context context) {
         mTextExport = new TextExport(context);
     }
 
+    //外部存储功能是否可用
     private static boolean externalStorageAvailable() {
         return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
     }
@@ -146,7 +153,7 @@ public class BackupUtils {
                         folderId
                     }, null);
 
-            if (notesCursor != null) {
+            if (notesCursor != null) {//利用光标来扫描内容，区别为callnote和note两种，靠ps.printline输出
                 if (notesCursor.moveToFirst()) {
                     do {
                         // Print note's last modified date
@@ -218,7 +225,7 @@ public class BackupUtils {
         /**
          * Note will be exported as text which is user readable
          */
-        public int exportToText() {
+        public int exportToText() {//总函数，调用上面的exportFolder和exportNote
             if (!externalStorageAvailable()) {
                 Log.d(TAG, "Media was not mounted");
                 return STATE_SD_CARD_UNMOUONTED;

java/net/micode/notes/tool/DataUtils.java

@@ -52,13 +52,13 @@ public class DataUtils {
             if(id == Notes.ID_ROOT_FOLDER) {
                 Log.e(TAG, "Don't delete system folder root");
                 continue;
-            }
+            }//如果发现是根文件夹，则不删除
             ContentProviderOperation.Builder builder = ContentProviderOperation
                     .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
             operationList.add(builder.build());
         }
         try {
-            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); //数据库事务，数据库事务是由一组数据库操作序列组成，事务作为一个整体被执行
             if (results == null || results.length == 0 || results[0] == null) {
                 Log.d(TAG, "delete notes failed, ids:" + ids.toString());
                 return false;

java/net/micode/notes/ui/AlarmAlertActivity.java

@@ -1,3 +1,19 @@
+/*
+ * 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;
@@ -23,81 +39,58 @@ import net.micode.notes.tool.DataUtils;
 
 import java.io.IOException;
 
+
 public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
-    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 long mNoteId;
+    private String mSnippet;
     private static final int SNIPPET_PREW_MAX_LEN = 60;
     MediaPlayer mPlayer;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        //Bundle类型的数据与Map类型的数据相似，都是以key-value的形式存储数据的
-        //onsaveInstanceState方法是用来保存Activity的状态的
-        //能从onCreate的参数savedInsanceState中获得状态数据
         requestWindowFeature(Window.FEATURE_NO_TITLE);
-        //界面显示——无标题
 
         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));
             mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
-            //根据ID从数据库中获取标签的内容；
-            //getContentResolver（）是实现数据共享，实例存储。
             mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                     SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                     : mSnippet;
-            //判断标签片段是否达到符合长度
         } catch (IllegalArgumentException e) {
             e.printStackTrace();
             return;
         }
-        /*
-        try
-        {
-        	// 代码区
-        }
-        catch(Exception e)
-        {
-        	// 异常处理
-        }
-                     代码区如果有错误，就会返回所写异常的处理。*/
+
         mPlayer = new MediaPlayer();
         if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
             showActionDialog();
-            //弹出对话框
             playAlarmSound();
-            //闹钟提示音激发
         } else {
             finish();
-            //完成闹钟动作
         }
     }
 
     private boolean isScreenOn() {
-        //判断屏幕是否锁屏，调用系统函数判断，最后返回值是布尔类型
         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);
-        //调用系统的铃声管理URI，得到闹钟提示音
+
         int silentModeStreams = Settings.System.getInt(getContentResolver(),
                 Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
 
@@ -108,19 +101,12 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
         try {
             mPlayer.setDataSource(this, url);
-            //方法：setDataSource(Context context, Uri uri) 
-            //解释：无返回值，设置多媒体数据来源【根据 Uri】
             mPlayer.prepare();
-            //准备同步
             mPlayer.setLooping(true);
-            //设置是否循环播放
             mPlayer.start();
-            //开始播放
         } catch (IllegalArgumentException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
-            //e.printStackTrace()函数功能是抛出异常， 还将显示出更深的调用信息
-            //System.out.println(e)，这个方法打印出异常，并且输出在哪里出现的异常
         } catch (SecurityException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
@@ -135,58 +121,38 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
 
     private void showActionDialog() {
         AlertDialog.Builder dialog = new AlertDialog.Builder(this);
-        //AlertDialog的构造方法全部是Protected的
-        //所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。
-        //要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法
-        //如这里的dialog就是新建了一个AlertDialog
         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);
-        //给对话框添加"Yes"按钮
         if (isScreenOn()) {
             dialog.setNegativeButton(R.string.notealert_enter, this);
-        }//对话框添加"No"按钮
+        }
         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:
-                //这是取消操作
                 Intent intent = new Intent(this, NoteEditActivity.class);
-                //实现两个类间的数据传输
                 intent.setAction(Intent.ACTION_VIEW);
-                //设置动作属性
                 intent.putExtra(Intent.EXTRA_UID, mNoteId);
-                //实现key-value对
-                //EXTRA_UID为key；mNoteId为键
                 startActivity(intent);
-                //开始动作
                 break;
             default:
-                //这是确定操作
                 break;
         }
     }
 
     public void onDismiss(DialogInterface dialog) {
-        //忽略
         stopAlarmSound();
-        //停止闹钟声音
         finish();
-        //完成该动作
     }
 
     private void stopAlarmSound() {
         if (mPlayer != null) {
             mPlayer.stop();
-            //停止播放
             mPlayer.release();
-            //释放MediaPlayer对象
             mPlayer = null;
         }
     }
-}
+}

java/net/micode/notes/ui/AlarmInitReceiver.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package net.micode.notes.ui;
 
 import android.app.AlarmManager;
@@ -30,25 +31,21 @@ import net.micode.notes.data.Notes.NoteColumns;
 public class AlarmInitReceiver extends BroadcastReceiver {
 
     private static final String [] PROJECTION = new String [] {
-            NoteColumns.ID,
-            NoteColumns.ALERTED_DATE
+        NoteColumns.ID,
+        NoteColumns.ALERTED_DATE
     };
-    //对数据库的操作，调用标签ID和闹钟时间
+
     private static final int COLUMN_ID                = 0;
     private static final int COLUMN_ALERTED_DATE      = 1;
 
     @Override
     public void onReceive(Context context, Intent intent) {
         long currentDate = System.currentTimeMillis();
-        //System.currentTimeMillis()产生一个当前的毫秒
-        //这个毫秒其实就是自1970年1月1日0时起的毫秒数
         Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
                 PROJECTION,
                 NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
                 new String[] { String.valueOf(currentDate) },
-                //将long变量currentDate转化为字符串
                 null);
-        //Cursor在这里的作用是通过查找数据库中的标签内容，找到和当前系统时间相等的标签
 
         if (c != null) {
             if (c.moveToFirst()) {
@@ -64,8 +61,5 @@ public class AlarmInitReceiver extends BroadcastReceiver {
             }
             c.close();
         }
-        //然而通过网上查找资料发现，对于闹钟机制的启动，通常需要上面的几个步骤
-        //如新建Intent、PendingIntent以及AlarmManager等
-        //这里就是根据数据库里的闹钟时间创建一个闹钟机制
     }
-}
+}

java/net/micode/notes/ui/AlarmReceiver.java

@@ -24,13 +24,7 @@ public class AlarmReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
         intent.setClass(context, AlarmAlertActivity.class);
-        //启动AlarmAlertActivity
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        //activity要存在于activity的栈中，而非activity的途径启动activity时必然不存在一个activity的栈
-        //所以要新起一个栈装入启动的activity
         context.startActivity(intent);
     }
 }
-//这是实现alarm这个功能最接近用户层的包，基于上面的两个包，
-//作用还需要深究但是对于setClass和addFlags的
- 

java/net/micode/notes/ui/DateTimePicker.java

@@ -29,8 +29,7 @@ import android.widget.FrameLayout;
 import android.widget.NumberPicker;
 
 public class DateTimePicker extends FrameLayout {
-    //FrameLayout是布局模板之一
-    //所有的子元素全部在屏幕的右上方
+
     private static final boolean DEFAULT_ENABLE_STATE = true;
 
     private static final int HOURS_IN_HALF_DAY = 12;
@@ -46,15 +45,13 @@ public class DateTimePicker extends FrameLayout {
     private static final int MINUT_SPINNER_MAX_VAL = 59;
     private static final int AMPM_SPINNER_MIN_VAL = 0;
     private static final int AMPM_SPINNER_MAX_VAL = 1;
-    //初始化控件
+
     private final NumberPicker mDateSpinner;
     private final NumberPicker mHourSpinner;
     private final NumberPicker mMinuteSpinner;
     private final NumberPicker mAmPmSpinner;
-    //NumberPicker是数字选择器
-    //这里定义的四个变量全部是在设置闹钟时需要选择的变量（如日期、时、分、上午或者下午）
     private Calendar mDate;
-    //定义了Calendar类型的变量mDate，用于操作时间
+
     private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
 
     private boolean mIsAm;
@@ -74,49 +71,41 @@ public class DateTimePicker extends FrameLayout {
             updateDateControl();
             onDateTimeChanged();
         }
-    };//OnValueChangeListener，这是时间改变监听器，这里主要是对日期的监听
-    //将现在日期的值传递给mDate；updateDateControl是同步操作
+    };
 
     private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
-        //这里是对 小时（Hour） 的监听
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             boolean isDateChanged = false;
             Calendar cal = Calendar.getInstance();
-            //声明一个Calendar的变量cal，便于后续的操作
             if (!mIs24HourView) {
                 if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, 1);
                     isDateChanged = true;
-                    //这里是对于12小时制时，晚上11点和12点交替时对日期的更改
                 } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, -1);
                     isDateChanged = true;
                 }
-                //这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
                 if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
                         oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
                     mIsAm = !mIsAm;
                     updateAmPmControl();
-                }//这里是对于12小时制时，中午11点和12点交替时对AM和PM的更改
+                }
             } else {
                 if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, 1);
                     isDateChanged = true;
-                    //这里是对于24小时制时，晚上11点和12点交替时对日期的更改
                 } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, -1);
                     isDateChanged = true;
                 }
-            } //这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
+            }
             int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
-            //通过数字选择器对newHour的赋值
             mDate.set(Calendar.HOUR_OF_DAY, newHour);
-            //通过set函数将新的Hour值传给mDate
             onDateTimeChanged();
             if (isDateChanged) {
                 setCurrentYear(cal.get(Calendar.YEAR));
@@ -128,19 +117,15 @@ public class DateTimePicker extends FrameLayout {
 
     private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
-        //这里是对 分钟（Minute）改变的监听
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             int minValue = mMinuteSpinner.getMinValue();
             int maxValue = mMinuteSpinner.getMaxValue();
             int offset = 0;
-            //设置offset，作为小时改变的一个记录数据
             if (oldVal == maxValue && newVal == minValue) {
                 offset += 1;
             } else if (oldVal == minValue && newVal == maxValue) {
                 offset -= 1;
             }
-            //如果原值为59，新值为0，则offset加1
-            //如果原值为0，新值为59，则offset减1
             if (offset != 0) {
                 mDate.add(Calendar.HOUR_OF_DAY, offset);
                 mHourSpinner.setValue(getCurrentHour());
@@ -160,7 +145,6 @@ public class DateTimePicker extends FrameLayout {
     };
 
     private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
-        //对AM和PM的监听
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             mIsAm = !mIsAm;
@@ -176,27 +160,24 @@ public class DateTimePicker extends FrameLayout {
 
     public interface OnDateTimeChangedListener {
         void onDateTimeChanged(DateTimePicker view, int year, int month,
-                               int dayOfMonth, int hourOfDay, int minute);
+                int dayOfMonth, int hourOfDay, int minute);
     }
 
     public DateTimePicker(Context context) {
         this(context, System.currentTimeMillis());
-    }//通过对数据库的访问，获取当前的系统时间
+    }
 
     public DateTimePicker(Context context, long date) {
         this(context, date, DateFormat.is24HourFormat(context));
-    }//上面函数的得到的是一个天文数字（1970至今的秒数），需要DateFormat将其变得有意义
+    }
 
     public DateTimePicker(Context context, long date, boolean is24HourView) {
         super(context);
-        //获取系统时间
         mDate = Calendar.getInstance();
         mInitialising = true;
         mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
         inflate(context, R.layout.datetime_picker, this);
-        //如果当前Activity里用到别的layout，比如对话框layout
-        //还要设置这个layout上的其他组件的内容，就必须用inflate()方法先将对话框的layout找出来
-        //然后再用findViewById()找到它上面的其它组件
+
         mDateSpinner = (NumberPicker) findViewById(R.id.date);
         mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
         mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
@@ -204,7 +185,7 @@ public class DateTimePicker extends FrameLayout {
 
         mHourSpinner = (NumberPicker) findViewById(R.id.hour);
         mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
-        mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner =  (NumberPicker) findViewById(R.id.minute);
         mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
         mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
         mMinuteSpinner.setOnLongPressUpdateInterval(100);
@@ -245,9 +226,7 @@ public class DateTimePicker extends FrameLayout {
         mAmPmSpinner.setEnabled(enabled);
         mIsEnabled = enabled;
     }
-    //存在疑问！！！！！！！！！！！！！setEnabled的作用
-    //下面的代码通过原程序的注释已经比较清晰，另外可以通过函数名来判断
-    //下面的各函数主要是对上面代码引用到的各函数功能的实现
+
     @Override
     public boolean isEnabled() {
         return mIsEnabled;
@@ -260,7 +239,7 @@ public class DateTimePicker extends FrameLayout {
      */
     public long getCurrentDateInTimeMillis() {
         return mDate.getTimeInMillis();
-    }//实现函数——得到当前的秒数
+    }
 
     /**
      * Set the current date
@@ -272,7 +251,7 @@ public class DateTimePicker extends FrameLayout {
         cal.setTimeInMillis(date);
         setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
                 cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
-    }//实现函数功能——设置当前的时间，参数是date
+    }
 
     /**
      * Set the current date
@@ -284,20 +263,19 @@ public class DateTimePicker extends FrameLayout {
      * @param minute The current minute
      */
     public void setCurrentDate(int year, int month,
-                               int dayOfMonth, int hourOfDay, int minute) {
+            int dayOfMonth, int hourOfDay, int minute) {
         setCurrentYear(year);
         setCurrentMonth(month);
         setCurrentDay(dayOfMonth);
         setCurrentHour(hourOfDay);
         setCurrentMinute(minute);
-    }//实现函数功能——设置当前的时间，参数是各详细的变量
+    }
 
     /**
      * Get current year
      *
      * @return The current year
      */
-    //下面是得到year、month、day等值
     public int getCurrentYear() {
         return mDate.get(Calendar.YEAR);
     }
@@ -468,7 +446,7 @@ public class DateTimePicker extends FrameLayout {
         mDateSpinner.setDisplayedValues(mDateDisplayValues);
         mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
         mDateSpinner.invalidate();
-    }// 对于星期几的算法
+    }
 
     private void updateAmPmControl() {
         if (mIs24HourView) {
@@ -477,7 +455,7 @@ public class DateTimePicker extends FrameLayout {
             int index = mIsAm ? Calendar.AM : Calendar.PM;
             mAmPmSpinner.setValue(index);
             mAmPmSpinner.setVisibility(View.VISIBLE);
-        }// 对于上下午操作的算法
+        }
     }
 
     private void updateHourControl() {
@@ -487,7 +465,7 @@ public class DateTimePicker extends FrameLayout {
         } else {
             mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
             mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
-        }// 对与小时的算法
+        }
     }
 
     /**
@@ -504,4 +482,4 @@ public class DateTimePicker extends FrameLayout {
                     getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
         }
     }
-}
+}