p4bog53jv
/
Notes-master
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

1

Browse Source
master
zhangqing 4 months ago
parent 1b7764a848
commit ec667998ff
1 changed files with 157 additions and 64 deletions
Show Stats Download Patch File Download Diff File

221
src/小米标签代码/src/net/micode/notes/data/NotesProvider.java
Unescape View File

@ -16,7 +16,6 @@
package net.micode.notes.data;
import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentUris;
@ -34,90 +33,121 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/**
* 笔记应用的ContentProvider
* 提供对笔记数据的CRUD操作和搜索功能
*/
public class NotesProvider extends ContentProvider {
// URI匹配器，用于匹配不同的URI请求
private static final UriMatcher mMatcher;
// 数据库帮助类实例
private NotesDatabaseHelper mHelper;
// 日志标签
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;
// URI匹配代码常量
private static final int URI_NOTE = 1; // 笔记集合
private static final int URI_NOTE_ITEM = 2; // 单个笔记
private static final int URI_DATA = 3; // 数据集合
private static final int URI_DATA_ITEM = 4; // 单个数据
private static final int URI_SEARCH = 5; // 搜索
private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议
// 静态初始化块，配置URI匹配器
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // content://micode_notes/note
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // content://micode_notes/note/#
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // content://micode_notes/data
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // content://micode_notes/data/#
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // content://micode_notes/search
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 带查询参数的搜索建议
}
/**
* 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.
* 搜索投影列定义
* x'0A' 在SQLite中代表'\n'字符。对于搜索结果中的标题和内容，
* 我们会修剪'\n'和空格以显示更多信息。
*/
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 建议项额外数据
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 建议项文本1
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 建议项文本2
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 建议项图标
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 建议项意图动作
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 建议项意图数据
/**
* 笔记片段搜索查询SQL语句
* 搜索不在回收站中的普通笔记
*/
private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+ " FROM " + TABLE.NOTE
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 模糊匹配搜索词
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站中的笔记
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 只搜索普通笔记类型
/**
* ContentProvider创建时的回调方法
* @return 是否成功创建
*/
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库帮助类实例
return true;
}
/**
* 查询数据
* 根据URI类型执行不同的查询操作
*
* @param uri 查询的URI
* @param projection 要返回的列
* @param selection 选择条件
* @param selectionArgs 选择参数
* @param sortOrder 排序方式
* @return 查询结果游标
*/
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库
String id = null;
// 根据URI匹配类型执行不同的查询
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 查询笔记集合
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
case URI_NOTE_ITEM: // 查询单个笔记
id = uri.getPathSegments().get(1); // 获取笔记ID
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
case URI_DATA: // 查询数据集合
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
case URI_DATA_ITEM: // 查询单个数据
id = uri.getPathSegments().get(1); // 获取数据ID
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_SEARCH:
case URI_SEARCH_SUGGEST:
case URI_SEARCH: // 搜索
case URI_SEARCH_SUGGEST: // 搜索建议
// 搜索和搜索建议不支持自定义排序和投影
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
String searchString = null;
// 根据URI类型获取搜索字符串
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1);
@ -126,12 +156,15 @@ public class NotesProvider extends ContentProvider {
searchString = uri.getQueryParameter("pattern");
}
// 检查搜索字符串是否为空
if (TextUtils.isEmpty(searchString)) {
return null;
}
try {
// 格式化搜索字符串，添加通配符用于模糊搜索
searchString = String.format("%%%s%%", searchString);
// 执行搜索查询
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
} catch (IllegalStateException ex) {
@ -141,21 +174,33 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 设置内容变更通知URI
if (c != null) {
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;
}
/**
* 插入数据
*
* @param uri 插入的URI
* @param values 要插入的值
* @return 新插入项的URI
*/
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
long dataId = 0, noteId = 0, insertedId = 0;
// 根据URI匹配类型执行不同的插入操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 插入笔记
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
case URI_DATA: // 插入数据
// 检查是否包含笔记ID
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
@ -166,37 +211,49 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
// 通知笔记URI的内容变更
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
// 通知数据URI的内容变更
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
}
// 返回新插入项的URI
return ContentUris.withAppendedId(uri, insertedId);
}
/**
* 删除数据
*
* @param uri 删除的URI
* @param selection 选择条件
* @param selectionArgs 选择参数
* @return 删除的行数
*/
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean deleteData = false;
// 根据URI匹配类型执行不同的删除操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 删除笔记集合
// 不允许删除系统文件夹（ID<=0），所以添加条件限制
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
case URI_NOTE_ITEM: // 删除单个笔记
id = uri.getPathSegments().get(1); // 获取笔记ID
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
* ID小于等于0的是系统文件夹，不允许删除
*/
long noteId = Long.valueOf(id);
if (noteId <= 0) {
@ -205,12 +262,12 @@ public class NotesProvider extends ContentProvider {
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
case URI_DATA: // 删除数据集合
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
case URI_DATA_ITEM: // 删除单个数据
id = uri.getPathSegments().get(1); // 获取数据ID
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
deleteData = true;
@ -218,8 +275,11 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 如果有数据被删除，通知内容变更
if (count > 0) {
if (deleteData) {
// 数据删除时需要通知笔记URI的内容变更
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
@ -227,29 +287,40 @@ public class NotesProvider extends ContentProvider {
return count;
}
/**
* 更新数据
*
* @param uri 更新的URI
* @param values 要更新的值
* @param selection 选择条件
* @param selectionArgs 选择参数
* @return 更新的行数
*/
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean updateData = false;
// 根据URI匹配类型执行不同的更新操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
case URI_NOTE: // 更新笔记集合
increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本号
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
case URI_NOTE_ITEM: // 更新单个笔记
id = uri.getPathSegments().get(1); // 获取笔记ID
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加笔记版本号
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
break;
case URI_DATA:
case URI_DATA: // 更新数据集合
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
case URI_DATA_ITEM: // 更新单个数据
id = uri.getPathSegments().get(1); // 获取数据ID
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
updateData = true;
@ -258,8 +329,10 @@ public class NotesProvider extends ContentProvider {
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 如果有数据被更新，通知内容变更
if (count > 0) {
if (updateData) {
// 数据更新时需要通知笔记URI的内容变更
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
@ -267,18 +340,33 @@ public class NotesProvider extends ContentProvider {
return count;
}
/**
* 解析选择条件，将条件字符串转换为SQL WHERE子句格式
*
* @param selection 原始选择条件
* @return 格式化后的选择条件
*/
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
/**
* 增加笔记版本号
* 当笔记被修改时，增加其版本号以跟踪变更
*
* @param id 笔记ID，如果为-1则使用选择条件
* @param selection 选择条件
* @param selectionArgs 选择参数
*/
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
sql.append(TABLE.NOTE);
sql.append(" SET ");
sql.append(NoteColumns.VERSION);
sql.append("=" + NoteColumns.VERSION + "+1 ");
sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号加1
// 构建WHERE子句
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");
}
@ -287,19 +375,24 @@ public class NotesProvider extends ContentProvider {
}
if (!TextUtils.isEmpty(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
// 替换参数占位符
for (String args : selectionArgs) {
selectString = selectString.replaceFirst("\\?", args);
}
sql.append(selectString);
}
// 执行SQL语句
mHelper.getWritableDatabase().execSQL(sql.toString());
}
/**
* 获取MIME类型
* 未实现，返回null
*/
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
// TODO: 根据URI返回相应的MIME类型
return null;
}
}
}
Write Preview
Loading…
Cancel
Save