pull/3/head
liuyitao 11 months ago
parent 69b8c477cc
commit 63094f152e

@ -19,7 +19,7 @@ package net.micode.notes.data;
import android.net.Uri;
/*
*便便
*Notes 便
*/
public class Notes {
public static final String AUTHORITY = "micode_notes"; // 定义内容提供器的权限
@ -267,7 +267,7 @@ public class Notes {
}
/*
* 便
* 便
*/
public static final class TextNote implements DataColumns {
/**
@ -286,7 +286,7 @@ public class Notes {
}
/*
* 便
* 便
*/
public static final class CallNote implements DataColumns {
/**

@ -34,17 +34,23 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/*
* 便便 ContentResolver 访便
* */
//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 {
private static final UriMatcher mMatcher;// UriMatcher用于匹配Uri
// UriMatcher用于匹配Uri
private static final UriMatcher mMatcher;
private NotesDatabaseHelper mHelper;// 数据库帮助类
private NotesDatabaseHelper mHelper;
private static final String TAG = "NotesProvider";// 标签
private static final String TAG = "NotesProvider";
private static final int URI_NOTE = 1;// Uri匹配码
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;
@ -53,17 +59,16 @@ public class NotesProvider extends ContentProvider {
private static final int URI_SEARCH_SUGGEST = 6;
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);// 创建UriMatcher时调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
/*
* Uri
* */
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);// 便签列表的路径
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);// 便签详情的路径,其中 "#" 表示数字,表示具体的便签 ID
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);// 数据列表的路径
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);// 数据详情的路径,其中 "#" 表示数字,表示具体的数据 ID
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);// 搜索的路径
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);// 搜索建议的路径
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);// 带搜索关键字的搜索建议的路径
// 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
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);
}
/**
@ -71,9 +76,7 @@ public class NotesProvider extends ContentProvider {
* we will trim '\n' and white space in order to show more information.
*/
/*
* 便 ID
* */
// 声明 NOTES_SEARCH_PROJECTION
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 + ","
@ -82,9 +85,7 @@ public class NotesProvider extends ContentProvider {
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + Notes.TextNote.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 " + TABLE.NOTE
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
@ -92,268 +93,249 @@ public class NotesProvider extends ContentProvider {
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
@Override
/*
*onCreate()ContextmHelper
* */
// Context只有在onCreate()中才被初始化
// 对mHelper进行实例化
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
@Override
/*
* Uri
* */
// 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;// 定义一个Cursor对象用于存放查询结果
SQLiteDatabase db = mHelper.getReadableDatabase();// 获取可读数据库实例
String id = null;// 用于存放ID值
/*
* Uri使Matcher
* */
Cursor c = null;
// 获取可读数据库
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
// 匹配查找uri
switch (mMatcher.match(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 = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);// 查询便签列表
sortOrder);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);// 获取Uri中的ID值
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);// 查询特定ID的便签详情
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);// 查询数据列表
sortOrder);
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1); // 获取Uri中的ID值
id = uri.getPathSegments().get(1);
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);// 查询特定ID的数据详情
+ 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");// 如果存在不合法的参数则抛出异常
"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); // 获取搜索关键字
// getPathSegments()方法得到一个String的List
// 在uri.getPathSegments().get(1)为第2个元素
searchString = uri.getPathSegments().get(1);
}
} else {
searchString = uri.getQueryParameter("pattern"); // 获取搜索关键字
searchString = uri.getQueryParameter("pattern");
}
if (TextUtils.isEmpty(searchString)) {
return null;// 如果搜索关键字为空则直接返回null
return null;
}
try {
searchString = String.format("%%%s%%", searchString);// 格式化搜索关键字
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });// 执行搜索查询
new String[] { searchString });
} catch (IllegalStateException ex) {
Log.e(TAG, "got exception: " + ex.toString());// 捕获异常
Log.e(TAG, "got exception: " + ex.toString());
}
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
// 抛出异常
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (c != null) {
c.setNotificationUri(getContext().getContentResolver(), uri);// 设置查询结果的变更通知URI
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;// 返回查询结果的Cursor对象
return c;
}
@Override
/*
*
* uri URIvalues
* */
// 插入一个uri
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();// 获得可写的数据库
long dataId = 0, noteId = 0, insertedId = 0;// 定义三个id值变量
/*
* Uri使Matcher
* */
// 获得可写的数据库
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
switch (mMatcher.match(uri)) {
// 新增一个条目
case URI_NOTE:
insertedId = noteId = db.insert(TABLE.NOTE, null, values);// 在便签表中插入新记录
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
// 如果存在查找NOTE_ID
case URI_DATA:
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);// 如果数据内容包含NOTE_ID字段获取NOTE_ID值
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
Log.d(TAG, "Wrong data format without note id:" + values.toString());// 如果不包含则输出日志信息
Log.d(TAG, "Wrong data format without note id:" + values.toString());
}
insertedId = dataId = db.insert(TABLE.DATA, null, values);// 在数据表中插入新记录
insertedId = dataId = db.insert(TABLE.DATA, null, values);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
if (noteId > 0) {// 如果是便签新增操作
// notifyChange获得一个ContextResolver对象并且更新里面的内容
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);// 通过ContentResolver对象发送通知更新便签的变更通知URI
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
if (dataId > 0) {// 如果是数据新增操作
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);// 通过ContentResolver对象发送通知更新数据的变更通知URI
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
}
return ContentUris.withAppendedId(uri, insertedId);// 返回插入的uri的路径
// 返回插入的uri的路径
return ContentUris.withAppendedId(uri, insertedId);
}
@Override
/*
*
* uri URIselection selectionArgs
* */
// 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;// 定义计数变量
String id = null;// 定义id字符串变量
SQLiteDatabase db = mHelper.getWritableDatabase();// 获取可写数据库实例
boolean deleteData = false;// 是否删除数据标志位
/*
* Uri使Matcher
* */
int count = 0;
String id = null;
// 获得可写的数据库
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean deleteData = false;
switch (mMatcher.match(uri)) {
case URI_NOTE:
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";// 对于便签的删除操作,添加额外的条件限制
count = db.delete(TABLE.NOTE, selection, selectionArgs);// 在便签表中删除符合条件的记录
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
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) {// 如果ID小于等于0则不允许删除
if (noteId <= 0) {
break;
}
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);// 在便签表中删除指定ID的记录
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = db.delete(TABLE.DATA, selection, selectionArgs);// 在数据表中删除符合条件的记录
deleteData = true;// 设置删除数据标志位为true
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);// 在数据表中删除指定ID的记录
deleteData = true;// 设置删除数据标志位为true
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
deleteData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) {// 如果删除记录数大于0
if (count > 0) {
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);// 通过ContentResolver对象发送通知更新便签变更通知URI
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);// 通过ContentResolver对象发送通知更新变更通知URI
getContext().getContentResolver().notifyChange(uri, null);
}
return count;// 返回删除的记录数
return count;
}
@Override
/*
*
* uri URIvalues selection selectionArgs
* */
// 更新一个uri
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
int count = 0;// 定义计数变量
String id = null;// 定义id字符串变量
SQLiteDatabase db = mHelper.getWritableDatabase();// 获取可写数据库实例
boolean updateData = false;// 是否更新数据标志位
/*
* Uri使Matcher
* */
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean updateData = false;
switch (mMatcher.match(uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);// 增加便签版本号,针对便签的更新操作,添加额外的条件限制
count = db.update(TABLE.NOTE, values, selection, selectionArgs);// 在便签表中更新符合条件的记录
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);// 增加便签版本号,针对便签的更新操作,添加额外的条件限制
id = uri.getPathSegments().get(1);
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);// 在便签表中更新指定ID的记录
+ parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = db.update(TABLE.DATA, values, selection, selectionArgs);// 在数据表中更新符合条件的记录
updateData = true;// 设置更新数据标志位为tru
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);// 在数据表中更新指定ID的记录
updateData = true;// 设置更新数据标志位为true
+ parseSelection(selection), selectionArgs);
updateData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) {// 如果更新记录数大于0
if (count > 0) {
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);// 通过ContentResolver对象发送通知更新便签变更通知URI
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);// 通过ContentResolver对象发送通知更新变更通知URI
getContext().getContentResolver().notifyChange(uri, null);
}
return count;// 返回更新的记录数
return count;
}
/*
* selectionselection" AND "SQL
* */
// 将字符串解析成规定格式
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
/*
* idselection1
* */
//增加一个noteVersion
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);// 创建一个StringBuilder对象用于构建SQL语句
sql.append("UPDATE ");// 构建UPDATE语句指定要更新的表名
sql.append(TABLE.NOTE);// 表名
sql.append(" SET ");// 指定要更新的字段和新的值
sql.append(NoteColumns.VERSION);// 字段名
sql.append("=" + NoteColumns.VERSION + "+1 ");// 将版本号加1
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
sql.append(TABLE.NOTE);
sql.append(" SET ");
sql.append(NoteColumns.VERSION);
sql.append("=" + NoteColumns.VERSION + "+1 ");
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");// 根据传入的参数决定是否添加WHERE子句
sql.append(" WHERE ");
}
if (id > 0) {
sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 如果传入的id大于0则表示只更新指定id的记录
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
}
if (!TextUtils.isEmpty(selection)) {// 如果传入的selection不为空则根据它来确定要更新的记录
String selectString = id > 0 ? parseSelection(selection) : selection;// 调用parseSelection方法将selection转换为SQL语句中的WHERE子句
if (!TextUtils.isEmpty(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
selectString = selectString.replaceFirst("\\?", args);// 替换WHERE子句中的问号占位符为实际的参数值
selectString = selectString.replaceFirst("\\?", args);
}
sql.append(selectString);// 添加WHERE子句到SQL语句中
sql.append(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
mHelper.getWritableDatabase().execSQL(sql.toString());// 添加WHERE子句到SQL语句中
mHelper.getWritableDatabase().execSQL(sql.toString());
}
@Override
/*
* URI MIME
* uri URI
*
* */
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}
}

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