目录
1、
2、
3、
4、
1、
package ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
//change
public class Contact { //联系人
private static HashMap<String, String> sContactCache;
private static final String TAG = "Contact";
// 定义字符串CALLER_ID_SELECTION
private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL("
+
+ ",?) AND " + + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+ " AND " + Data.RAW_CONTACT_ID + " IN "
+ "(SELECT raw_contact_id "
+ " FROM phone_lookup"
+ " WHERE min_match = '+')";
// 获取联系人
public static String getContact(Context context, String phoneNumber) {
if(sContactCache == null) {
sContactCache = new HashMap<String, String>();
}
// 查找HashMap中是否已有phoneNumber信息
if((phoneNumber)) {
return (phoneNumber);
}
String selection = CALLER_ID_SELECTION.replace("+",
(phoneNumber));
// 查找数据库中phoneNumber的信息
Cursor cursor = ().query(
Data.CONTENT_URI,
new String [] { Phone.DISPLAY_NAME },
selection,
new String[] { phoneNumber },
null);
// 判定查询结果
// moveToFirst()返回第一条
if (cursor != null && ()) {
try {
// 找到相关信息
String name = (0);
(phoneNumber, name);
return name;
// 异常
} catch (IndexOutOfBoundsException e) {
(TAG, " Cursor get string error " + ());
return null;
} finally {
();
}
// 未找到相关信息
} else {
(TAG, "No contact matched with number:" + phoneNumber);
return null;
}
}
}
2、
package ;
import ;
import ;
// Notes 类中定义了很多常量，这些常量大多是int型和string型
public class Notes {
public static final String AUTHORITY = "micode_notes";
public static final String TAG = "Notes";
//以下三个常量对的值进行设置时会用到
public static final int TYPE_NOTE = 0;
public static final int TYPE_FOLDER = 1;
public static final int TYPE_SYSTEM = 2;
/**
* Following IDs are system folders' identifiers
* {@link Notes#ID_ROOT_FOLDER } is default folder
* {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
* {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
*/
public static final int ID_ROOT_FOLDER = 0;
public static final int ID_TEMPARAY_FOLDER = -1;
public static final int ID_CALL_RECORD_FOLDER = -2;
public static final int ID_TRASH_FOLER = -3;
public static final String INTENT_EXTRA_ALERT_DATE =
".alert_date";
public static final String INTENT_EXTRA_BACKGROUND_ID =
".background_color_id";
public static final String INTENT_EXTRA_WIDGET_ID =
".widget_id";
public static final String INTENT_EXTRA_WIDGET_TYPE =
".widget_type";
public static final String INTENT_EXTRA_FOLDER_ID =
".folder_id";
public static final String INTENT_EXTRA_CALL_DATE =
".call_date";
public static final int TYPE_WIDGET_INVALIDE = -1;
public static final int TYPE_WIDGET_2X = 0;
public static final int TYPE_WIDGET_4X = 1;
public static class DataConstants {
public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
}
/**
* Uri to query all notes and folders
*/
public static final Uri CONTENT_NOTE_URI = ("content://" +
AUTHORITY + "/note");//定义查询便签和文件夹的指针。
// public static final Uri my_URI = (Notes.CONTENT_NOTE_URI , 10);
/**
* Uri to query data
*/
public static final Uri CONTENT_DATA_URI = ("content://" +
AUTHORITY + "/data");//定义查找数据的指针。
// 定义NoteColumns的常量,用于后面创建数据库的表头
public interface NoteColumns {
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";
/**
* The parent's id for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String PARENT_ID = "parent_id";//为什么会有parent_id
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String CREATED_DATE = "created_date";
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
public static final String MODIFIED_DATE = "modified_date";
/**
* Alert date
* <P> Type: INTEGER (long) </P>
*/
public static final String ALERTED_DATE = "alert_date";
/**
* Folder's name or text content of note
* <P> Type: TEXT </P>
*/
public static final String SNIPPET = "snippet";
/**
* Note's widget id
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_ID = "widget_id";
/**
* Note's widget type
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_TYPE = "widget_type";
/**
* Note's background color's id
* <P> Type: INTEGER (long) </P>
*/
public static final String BG_COLOR_ID = "bg_color_id";
/**
* For text note, it doesn't has attachment, for multi-media
* note, it has at least one attachment
* <P> Type: INTEGER </P>
*/
public static final String HAS_ATTACHMENT = "has_attachment";
/**
* Folder's count of notes
* <P> Type: INTEGER (long) </P>
*/
public static final String NOTES_COUNT = "notes_count";
/**
* The file type: folder or note
* <P> Type: INTEGER </P>
*/
public static final String TYPE = "type";
/**
* The last sync id
* <P> Type: INTEGER (long) </P>
*/
public static final String SYNC_ID = "sync_id";//同步
/**
* Sign to indicate local modified or not
* <P> Type: INTEGER </P>
*/
public static final String LOCAL_MODIFIED = "local_modified";
/**
* Original parent id before moving into temporary folder
* <P> Type : INTEGER </P>
*/
public static final String ORIGIN_PARENT_ID = "origin_parent_id";
/**
* The gtask id
* <P> Type : TEXT </P>
*/
public static final String GTASK_ID = "gtask_id";
/**
* The version code
* <P> Type : INTEGER (long) </P>
*/
public static final String VERSION = "version";
}//这些常量主要是定义便签的属性的。
// 定义DataColumns的常量,用于后面创建数据库的表头
public interface DataColumns {
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";
/**
* The MIME type of the item represented by this row.
* <P> Type: Text </P>
*/
public static final String MIME_TYPE = "mime_type";
/**
* The reference id to note that this data belongs to
* <P> Type: INTEGER (long) </P>
*/
public static final String NOTE_ID = "note_id";
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String CREATED_DATE = "created_date";
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
public static final String MODIFIED_DATE = "modified_date";
/**
* Data's content
* <P> Type: TEXT </P>
*/
public static final String CONTENT = "content";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific,
used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA1 = "data1";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific,
used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA2 = "data2";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific,
used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA3 = "data3";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific,
used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA4 = "data4";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific,
used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA5 = "data5";
}//主要是定义存储便签内容数据的
public static final class TextNote implements DataColumns {
/**
* Mode to indicate the text in check list mode or not
* <P> Type: Integer 1:check list mode 0: normal mode </P>
*/
public static final String MODE = DATA1;
public static final int MODE_CHECK_LIST = 1;
public static final String CONTENT_TYPE =
"/text_note";
public static final String CONTENT_ITEM_TYPE =
"/text_note";
public static final Uri CONTENT_URI = ("content://" +
AUTHORITY + "/text_note");
}//文本内容的数据结构
public static final class CallNote implements DataColumns {
/**
* Call date for this record
* <P> Type: INTEGER (long) </P>
*/
public static final String CALL_DATE = DATA1;
/**
* Phone number for this record
* <P> Type: TEXT </P>
*/
public static final String PHONE_NUMBER = DATA3;
public static final String CONTENT_TYPE =
"/call_note";
public static final String CONTENT_ITEM_TYPE =
"/call_note";
public static final Uri CONTENT_URI = ("content://" +
AUTHORITY + "/call_note");
}//电话内容的数据结构
}
3、
package ;
import ;//就是用于保存一些数据（string boolean byte double float int long short ...）信息，这些信息可以被数据库操作时使用。
import ;//加载和访问资源。（android中主要是这两个功能，但是这里具体不清楚）
import ;//主要提供了对应于添加、删除、更新、查询的操作方法： insert()、delete()、update()和query()。配合
import ;//用来管理数据的创建和版本更新
import ;
import ;
import ;
import ;
//数据库操作，用SQLOpenhelper,对一些note和文件进行数据库的操作，比如删除文件后，将文件里的note也相应删除
public class NotesDatabaseHelper extends SQLiteOpenHelper {
private static final String DB_NAME = "";
private static final int DB_VERSION = 4;
public interface TABLE { //接口，分成note和data，在后面的程序里分别使用过
public static final String NOTE = "note";
public static final String DATA = "data";
}
private static final String TAG = "NotesDatabaseHelper";
private static NotesDatabaseHelper mInstance;
private static final String CREATE_NOTE_TABLE_SQL =
"CREATE TABLE " + + "(" +
+ " INTEGER PRIMARY KEY," +
NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
+ " TEXT NOT NULL DEFAULT ''," +
+ " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
+ " INTEGER NOT NULL DEFAULT 0" +
")";//数据库中需要存储的项目的名称，就相当于创建一个表格的表头的内容。
private static final String CREATE_DATA_TABLE_SQL =
"CREATE TABLE " + + "(" +
+ " INTEGER PRIMARY KEY," +
DataColumns.MIME_TYPE + " TEXT NOT NULL," +
DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+ " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA1 + " INTEGER," +
DataColumns.DATA2 + " INTEGER," +
DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
")";//和上面的功能一样，主要是存储的项目不同
private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
"CREATE INDEX IF NOT EXISTS note_id_index ON " +
+ "(" + DataColumns.NOTE_ID + ");";//存储便签编号的一个数据表格
/**
* Increase folder's note count when move note to the folder
*/
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_update "+
" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + +
" BEGIN " +
" UPDATE " + +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
" WHERE " + + "=new." + NoteColumns.PARENT_ID + ";" +
" END";//在文件夹中移入一个Note之后需要更改的数据的表格。
/**
* Decrease folder's note count when move note from folder
*/
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_update " +
" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + +
" BEGIN " +
" UPDATE " + +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
" WHERE " + + "=old." + NoteColumns.PARENT_ID +
" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
" END";//在文件夹中移出一个Note之后需要更改的数据的表格。
/**
* Increase folder's note count when insert new note to the folder
*/
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_insert " +
" AFTER INSERT ON " + +
" BEGIN " +
" UPDATE " + +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
" WHERE " + + "=new." + NoteColumns.PARENT_ID + ";" +
" END";//在文件夹中插入一个Note之后需要更改的数据的表格。
/**
* Decrease folder's note count when delete note from the folder
*/
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_delete " +
" AFTER DELETE ON " + +
" BEGIN " +
" UPDATE " + +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
" WHERE " + + "=old." + NoteColumns.PARENT_ID +
" AND " + NoteColumns.NOTES_COUNT + ">0;" +
" END";//在文件夹中删除一个Note之后需要更改的数据的表格。
/**
* Update note's content when insert data with type {@link DataConstants#NOTE}
*/
private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
"CREATE TRIGGER update_note_content_on_insert " +
" AFTER INSERT ON " + +
" WHEN new." + DataColumns.MIME_TYPE + "='" + + "'" +
" BEGIN" +
" UPDATE " + +
" SET " + + "=new." + +
" WHERE " + + "=new." + DataColumns.NOTE_ID + ";" +
" END";//在文件夹中对一个Note导入新的数据之后需要更改的数据的表格。
/**
* Update note's content when data with {@link DataConstants#NOTE} type has changed
*/
private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER update_note_content_on_update " +
" AFTER UPDATE ON " + +
" WHEN old." + DataColumns.MIME_TYPE + "='" + + "'" +
" BEGIN" +
" UPDATE " + +
" SET " + + "=new." + +
" WHERE " + + "=new." + DataColumns.NOTE_ID + ";" +
" END";//Note数据被修改后需要更改的数据的表格。
/**
* Update note's content when data with {@link DataConstants#NOTE} type has deleted
*/
private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
"CREATE TRIGGER update_note_content_on_delete " +
" AFTER delete ON " + +
" WHEN old." + DataColumns.MIME_TYPE + "='" + + "'" +
" BEGIN" +
" UPDATE " + +
" SET " + + "=''" +
" WHERE " + + "=old." + DataColumns.NOTE_ID + ";" +
" END";//Note数据被删除后需要更改的数据的表格。
/**
* Delete datas belong to note which has been deleted
*/
private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
"CREATE TRIGGER delete_data_on_delete " +
" AFTER DELETE ON " + +
" BEGIN" +
" DELETE FROM " + +
" WHERE " + DataColumns.NOTE_ID + "=old." + + ";" +
" END";//删除已删除的便签的数据后需要更改的数据的表格。
/**
* Delete notes belong to folder which has been deleted
*/
private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
"CREATE TRIGGER folder_delete_notes_on_delete " +
" AFTER DELETE ON " + +
" BEGIN" +
" DELETE FROM " + +
" WHERE " + NoteColumns.PARENT_ID + "=old." + + ";" +
" END";//删除已删除的文件夹的便签后需要更改的数据的表格。
/**
* Move notes belong to folder which has been moved to trash folder
*/
private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
"CREATE TRIGGER folder_move_notes_on_trash " +
" AFTER UPDATE ON " + +
" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
" BEGIN" +
" UPDATE " + +
" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
" WHERE " + NoteColumns.PARENT_ID + "=old." + + ";" +
" END";//还原垃圾桶中便签后需要更改的数据的表格。
public NotesDatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}//构造函数，传入数据库的名称和版本
public void createNoteTable(SQLiteDatabase db) {
(CREATE_NOTE_TABLE_SQL);
reCreateNoteTableTriggers(db);
createSystemFolder(db);
(TAG, "note table has been created");
}//创建表格（用来存储标签属性）
private void reCreateNoteTableTriggers(SQLiteDatabase db) {
("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
("DROP TRIGGER IF EXISTS delete_data_on_delete");
("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
}//execSQL是数据库操作的API，主要是更改行为的SQL语句。
//在这里主要是用来重新创建上述定义的表格用的，先删除原来有的数据库的触发器再重新创建新的数据库
private void createSystemFolder(SQLiteDatabase db) {
ContentValues values = new ContentValues();
/**
* call record foler for call notes
*/
(, Notes.ID_CALL_RECORD_FOLDER);
(, Notes.TYPE_SYSTEM);
(, null, values);
/**
* root folder which is default folder
*/
();
(, Notes.ID_ROOT_FOLDER);
(, Notes.TYPE_SYSTEM);
(, null, values);
/**
* temporary folder which is used for moving note
*/
();
(, Notes.ID_TEMPARAY_FOLDER);
(, Notes.TYPE_SYSTEM);
(, null, values);
/**
* create trash folder
*/
();
(, Notes.ID_TRASH_FOLER);
(, Notes.TYPE_SYSTEM);
(, null, values);
}//创建几个系统文件夹
public void createDataTable(SQLiteDatabase db) {
(CREATE_DATA_TABLE_SQL);
reCreateDataTableTriggers(db);
(CREATE_DATA_NOTE_ID_INDEX_SQL);
(TAG, "data table has been created");
}//创建表格（用来存储标签内容）
private void reCreateDataTableTriggers(SQLiteDatabase db) {
("DROP TRIGGER IF EXISTS update_note_content_on_insert");
("DROP TRIGGER IF EXISTS update_note_content_on_update");
("DROP TRIGGER IF EXISTS update_note_content_on_delete");
(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
}//同上面的execSQL
static synchronized NotesDatabaseHelper getInstance(Context context) {
if (mInstance == null) {
mInstance = new NotesDatabaseHelper(context);
}
return mInstance;
}//上网查是为解决同一时刻只能有一个线程执行.
//在写程序库代码时，有时有一个类需要被所有的其它类使用，
//但又要求这个类只能被实例化一次，是个服务类，定义一次，其它类使用同一个这个类的实例
@Override
public void onCreate(SQLiteDatabase db) {
createNoteTable(db);
createDataTable(db);
}//实现两个表格（上面创建的两个表格）
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
boolean reCreateTriggers = false;
boolean skipV2 = false;
if (oldVersion == 1) {
upgradeToV2(db);
skipV2 = true; // this upgrade including the upgrade from v2 to v3
oldVersion++;
}
if (oldVersion == 2 && !skipV2) {
upgradeToV3(db);
reCreateTriggers = true;
oldVersion++;
}
if (oldVersion == 3) {
upgradeToV4(db);
oldVersion++;
}
if (reCreateTriggers) {
reCreateNoteTableTriggers(db);
reCreateDataTableTriggers(db);
}
if (oldVersion != newVersion) {
throw new IllegalStateException("Upgrade notes database to version " + newVersion
+ "fails");
}
}//数据库版本的更新（数据库内容的更改）
private void upgradeToV2(SQLiteDatabase db) {
("DROP TABLE IF EXISTS " + );
("DROP TABLE IF EXISTS " + );
createNoteTable(db);
createDataTable(db);
}//更新到V2版本
private void upgradeToV3(SQLiteDatabase db) {
// drop unused triggers
("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
// add a column for gtask id
("ALTER TABLE " + + " ADD COLUMN " + NoteColumns.GTASK_ID
+ " TEXT NOT NULL DEFAULT ''");
// add a trash system folder
ContentValues values = new ContentValues();
(, Notes.ID_TRASH_FOLER);
(, Notes.TYPE_SYSTEM);
(, null, values);
}//更新到V3版本
private void upgradeToV4(SQLiteDatabase db) {
("ALTER TABLE " + + " ADD COLUMN " +
+ " INTEGER NOT NULL DEFAULT 0");
}//更新到V4版本,但是不知道V2、V3、V4是什么意思
}
4、
package ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据
//ContentProvider提供的方法
//query：查询
//insert：插入
//update：更新
//delete：删除
//getType：得到数据类型
public class NotesProvider extends ContentProvider {
// UriMatcher用于匹配Uri
private static final UriMatcher mMatcher;
private NotesDatabaseHelper mHelper;
private static final String TAG = "NotesProvider";
private static final int URI_NOTE = 1;
private static final int URI_NOTE_ITEM = 2;
private static final int URI_DATA = 3;
private static final int URI_DATA_ITEM = 4;
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
static {
// 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// 把需要匹配Uri路径全部给注册上
(, "note", URI_NOTE);
(, "note/#", URI_NOTE_ITEM);
(, "data", URI_DATA);
(, "data/#", URI_DATA_ITEM);
(, "search", URI_SEARCH);
(, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
(, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
}
/**
* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
* we will trim '\n' and white space in order to show more information.
*/
// 声明 NOTES_SEARCH_PROJECTION
private static final String NOTES_SEARCH_PROJECTION = + ","
+ + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+ "TRIM(REPLACE(" + + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+ "TRIM(REPLACE(" + + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+ .search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + .CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
// 声明NOTES_SNIPPET_SEARCH_QUERY
private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+ " FROM " +
+ " WHERE " + + " LIKE ?"
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+ " AND " + + "=" + Notes.TYPE_NOTE;
@Override
// Context只有在onCreate()中才被初始化
// 对mHelper进行实例化
public boolean onCreate() {
mHelper = (getContext());
return true;
}
@Override
// 查询uri在数据库中对应的位置
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
// 获取可读数据库
SQLiteDatabase db = ();
String id = null;
// 匹配查找uri
switch ((uri)) {
// 对于不同的匹配值，在数据库中查找相应的条目
case URI_NOTE:
c = (, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_NOTE_ITEM:
id = ().get(1);
c = (, projection, + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = (, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM:
id = ().get(1);
c = (, projection, + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_SEARCH:
case URI_SEARCH_SUGGEST:
if (sortOrder != null || projection != null) {
// 不合法的参数异常
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
String searchString = null;
if ((uri) == URI_SEARCH_SUGGEST) {
if (().size() > 1) {
// getPathSegments()方法得到一个String的List，
// 在().get(1)为第2个元素
searchString = ().get(1);
}
} else {
searchString = ("pattern");
}
if ((searchString)) {
return null;
}
try {
searchString = ("%%%s%%", searchString);
c = (NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
} catch (IllegalStateException ex) {
(TAG, "got exception: " + ());
}
break;
default:
// 抛出异常
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (c != null) {
(getContext().getContentResolver(), uri);
}
return c;
}
@Override
// 插入一个uri
public Uri insert(Uri uri, ContentValues values) {
// 获得可写的数据库
SQLiteDatabase db = ();
long dataId = 0, noteId = 0, insertedId = 0;
switch ((uri)) {
// 新增一个条目
case URI_NOTE:
insertedId = noteId = (, null, values);
break;
// 如果存在，查找NOTE_ID
case URI_DATA:
if ((DataColumns.NOTE_ID)) {
noteId = (DataColumns.NOTE_ID);
} else {
(TAG, "Wrong data format without note id:" + ());
}
insertedId = dataId = (, null, values);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
// notifyChange获得一个ContextResolver对象并且更新里面的内容
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
(Notes.CONTENT_DATA_URI, dataId), null);
}
// 返回插入的uri的路径
return (uri, insertedId);
}
@Override
// 删除一个uri
public int delete(Uri uri, String selection, String[] selectionArgs) {
//Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示。
int count = 0;
String id = null;
// 获得可写的数据库
SQLiteDatabase db = ();
boolean deleteData = false;
switch ((uri)) {
case URI_NOTE:
selection = "(" + selection + ") AND " + + ">0 ";
count = (, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = ().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
long noteId = (id);
if (noteId <= 0) {
break;
}
count = (,
+ "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = (, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
id = ().get(1);
count = (,
+ "=" + id + parseSelection(selection), selectionArgs);
deleteData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) {
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
}
return count;
}
@Override
// 更新一个uri
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = ();
boolean updateData = false;
switch ((uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
count = (, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = ().get(1);
increaseNoteVersion((id), selection, selectionArgs);
count = (, values, + "=" + id
+ parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = (, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
id = ().get(1);
count = (, values, + "=" + id
+ parseSelection(selection), selectionArgs);
updateData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) {
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
}
return count;
}
// 将字符串解析成规定格式
private String parseSelection(String selection) {
return (!(selection) ? " AND (" + selection + ')' : "");
}
//增加一个noteVersion
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
("UPDATE ");
();
(" SET ");
();
("=" + + "+1 ");
if (id > 0 || !(selection)) {
(" WHERE ");
}
if (id > 0) {
( + "=" + (id));
}
if (!(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
selectString = ("\\?", args);
}
(selectString);
}
// execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句
().execSQL(());
}
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}
}