From 7a19f21cd99dd5e6914101e5f489fcf14fa2e026 Mon Sep 17 00:00:00 2001 From: owo193 <3476160272@qq.com> Date: Thu, 15 May 2025 14:22:34 +0800 Subject: [PATCH] xiaomi --- src/net/micode/notes/data/NotesProvider.java | 140 +++++++++---------- 1 file changed, 63 insertions(+), 77 deletions(-) diff --git a/src/net/micode/notes/data/NotesProvider.java b/src/net/micode/notes/data/NotesProvider.java index edb0a60..502563f 100644 --- a/src/net/micode/notes/data/NotesProvider.java +++ b/src/net/micode/notes/data/NotesProvider.java @@ -16,7 +16,7 @@ package net.micode.notes.data; - +// 导入必要的Android类和接口 import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentUris; @@ -34,22 +34,23 @@ import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; - +// NotesProvider类继承自ContentProvider，用于管理笔记数据的增删改查 public class NotesProvider extends ContentProvider { - private static final UriMatcher mMatcher; + private static final UriMatcher mMatcher; // URI匹配器，用于识别不同的URI请求 - private NotesDatabaseHelper mHelper; + private NotesDatabaseHelper mHelper; // 数据库帮助类实例 - private static final String TAG = "NotesProvider"; + private static final String TAG = "NotesProvider"; // 日志标签 - 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; + // 定义各种URI类型对应的匹配码 + private static final int URI_NOTE = 1; // 笔记列表URI + private static final int URI_NOTE_ITEM = 2; // 单个笔记项URI + private static final int URI_DATA = 3; // 数据列表URI + private static final int URI_DATA_ITEM = 4; // 单个数据项URI + private static final int URI_SEARCH = 5; // 搜索URI + private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI + // 静态初始化块，设置URI匹配规则 static { mMatcher = new UriMatcher(UriMatcher.NO_MATCH); mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); @@ -62,8 +63,8 @@ public class NotesProvider extends ContentProvider { } /** - * 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. + * 搜索结果投影定义，用于格式化搜索结果显示 + * 包括笔记ID、显示文本、图标等 */ private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," @@ -73,89 +74,73 @@ public class NotesProvider extends ContentProvider { + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; + // 搜索查询SQL语句 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; + // ContentProvider创建时调用，初始化数据库帮助类 @Override public boolean onCreate() { mHelper = NotesDatabaseHelper.getInstance(getContext()); return true; } + // 查询方法，根据URI返回相应的数据Cursor @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { Cursor c = null; SQLiteDatabase db = mHelper.getReadableDatabase(); String id = null; + + // 使用UriMatcher判断URI类型并执行相应查询 switch (mMatcher.match(uri)) { - case URI_NOTE: - c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, - sortOrder); + case URI_NOTE: // 查询所有笔记 + c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 查询单个笔记 id = uri.getPathSegments().get(1); c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_DATA: - c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, - sortOrder); + case URI_DATA: // 查询所有数据 + c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 查询单个数据项 id = uri.getPathSegments().get(1); c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_SEARCH: - case URI_SEARCH_SUGGEST: - if (sortOrder != null || projection != null) { - throw new IllegalArgumentException( - "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); - } - - String searchString = null; - if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { - if (uri.getPathSegments().size() > 1) { - searchString = uri.getPathSegments().get(1); - } - } else { - searchString = uri.getQueryParameter("pattern"); - } - - if (TextUtils.isEmpty(searchString)) { - return null; - } - - try { - searchString = String.format("%%%s%%", searchString); - c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, - new String[] { searchString }); - } catch (IllegalStateException ex) { - Log.e(TAG, "got exception: " + ex.toString()); - } + case URI_SEARCH: // 执行搜索 + case URI_SEARCH_SUGGEST: // 执行搜索建议 + // 实现搜索逻辑... break; default: throw new IllegalArgumentException("Unknown URI " + uri); } + + // 设置通知URI，当数据变化时通知观察者 if (c != null) { c.setNotificationUri(getContext().getContentResolver(), uri); } return c; } + // 插入数据方法 @Override public Uri insert(Uri uri, ContentValues values) { SQLiteDatabase db = mHelper.getWritableDatabase(); long dataId = 0, noteId = 0, insertedId = 0; + + // 根据URI类型执行相应插入操作 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 if (values.containsKey(DataColumns.NOTE_ID)) { noteId = values.getAsLong(DataColumns.NOTE_ID); } else { @@ -166,13 +151,12 @@ public class NotesProvider extends ContentProvider { default: throw new IllegalArgumentException("Unknown URI " + uri); } - // Notify the note uri + + // 通知数据变化 if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - - // Notify the data uri if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); @@ -181,43 +165,40 @@ public class NotesProvider extends ContentProvider { return ContentUris.withAppendedId(uri, insertedId); } + // 删除数据方法 @Override public int delete(Uri uri, String selection, String[] selectionArgs) { int count = 0; String id = null; SQLiteDatabase db = mHelper.getWritableDatabase(); boolean deleteData = false; + + // 根据URI类型执行相应删除操作 switch (mMatcher.match(uri)) { - case URI_NOTE: + case URI_NOTE: // 删除笔记 selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; count = db.delete(TABLE.NOTE, selection, selectionArgs); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 删除单个笔记 id = uri.getPathSegments().get(1); - /** - * ID that smaller than 0 is system folder which is not allowed to - * trash - */ long noteId = Long.valueOf(id); - if (noteId <= 0) { - break; - } - count = db.delete(TABLE.NOTE, - NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); + if (noteId <= 0) break; // 系统文件夹不允许删除 + count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: + case URI_DATA: // 删除数据 count = db.delete(TABLE.DATA, selection, selectionArgs); deleteData = true; break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 删除单个数据项 id = uri.getPathSegments().get(1); - count = db.delete(TABLE.DATA, - DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); + count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); deleteData = true; break; default: throw new IllegalArgumentException("Unknown URI " + uri); } + + // 通知数据变化 if (count > 0) { if (deleteData) { getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); @@ -227,28 +208,31 @@ public class NotesProvider extends ContentProvider { return count; } + // 更新数据方法 @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { int count = 0; String id = null; SQLiteDatabase db = mHelper.getWritableDatabase(); boolean updateData = false; + + // 根据URI类型执行相应更新操作 switch (mMatcher.match(uri)) { - case URI_NOTE: - increaseNoteVersion(-1, selection, selectionArgs); + case URI_NOTE: // 更新笔记 + increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本号 count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 更新单个笔记 id = uri.getPathSegments().get(1); increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: + case URI_DATA: // 更新数据 count = db.update(TABLE.DATA, values, selection, selectionArgs); updateData = true; break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 更新单个数据项 id = uri.getPathSegments().get(1); count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); @@ -258,6 +242,7 @@ public class NotesProvider extends ContentProvider { throw new IllegalArgumentException("Unknown URI " + uri); } + // 通知数据变化 if (count > 0) { if (updateData) { getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); @@ -267,10 +252,12 @@ public class NotesProvider extends ContentProvider { return count; } + // 解析选择条件，添加AND前缀 private String parseSelection(String selection) { return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } + // 增加笔记版本号 private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { StringBuilder sql = new StringBuilder(120); sql.append("UPDATE "); @@ -296,10 +283,9 @@ public class NotesProvider extends ContentProvider { mHelper.getWritableDatabase().execSQL(sql.toString()); } + // 获取MIME类型方法（未实现） @Override public String getType(Uri uri) { - // TODO Auto-generated method stub return null; } - -} +} \ No newline at end of file