package fkshl.activity.contentProvider; /* Copyright (C) 2006 The Android Open Source Project * * 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. */ import java.util.ArrayList; import java.util.List; import java.util.regex.Pattern; import android.net.Uri; public class UriMatcher { public static final int NO_MATCH = -1; /*** * * Creates the root node of the URI tree. * * * * @param code * the code to match for the root URI */ public UriMatcher(int code){ mCode = code; mWhich = -1; mChildren = new ArrayList<UriMatcher>(); mText = null; } private UriMatcher(){ mCode = NO_MATCH; mWhich = -1; mChildren = new ArrayList<UriMatcher>(); mText = null; } /*** * * Add a URI to match, and the code to return when this URI is * * matched. URI nodes may be exact match string, the token "*" * * that matches any text, or the token "#" that matches only * * numbers. * * * * @param authority * the authority to match * * @param path * the path to match. * may be used as a wild card for * * any text, and # may be used as a wild card for numbers. * * @param code * the code that is returned when a URI is matched * * against the given components. Must be positive. */ public void addURI(String authority, String path, int code){ if (code < 0) { throw new IllegalArgumentException("code " + code + " is invalid: it must be positive"); } //以"/"分隔path String[] tokens = path != null ? PATH_SPLIT_PATTERN.split(path) : null; //判断分隔后的数组长度.并取其值 int numTokens = tokens != null ? tokens.length : 0; //当前对象 UriMatcher node = this; for (int i = -1; i < numTokens; i++) { //当前循环变量小于0就取authority,否则就获取分隔后的数组的字符,并赋值给token String token = i < 0 ? authority : tokens[i]; //把当前对象的集合赋值给children ArrayList<UriMatcher> children = node.mChildren; //获取其长度 int numChildren = children.size(); UriMatcher child; int j; for (j = 0; j < numChildren; j++) { //获取children对象的孩子 child = children.get(j); //判断当前的token和child对象中的mText是否相等 if (token.equals(child.mText)) { //把child 赋值给 node; node = child; break; } } //获取循环变量j并判断是否等于children对应的大小.也就是判断是否是最后一个 if (j == numChildren) { // Child not found, create it //没有发现孩子,并创建 child = new UriMatcher(); ///判断当前的token是否等于"#" if (token.equals("#")) { //mWhich=1 child.mWhich = NUMBER; } else if (token.equals("*")) { //mWhich=2 child.mWhich = TEXT; } else { //mWhich=0 child.mWhich = EXACT; } //mText=当前的token child.mText = token; //添加到mChildren集合中 node.mChildren.add(child); //node = child; node = child; } } //node.mCode = code; node.mCode = code; } static final Pattern PATH_SPLIT_PATTERN = Pattern.compile("/"); /*** * * Try to match against the path in a url. * * * * @param uri * The url whose path we will match against. * * * * @return The code for the matched node (added using addURI), * * or -1 if there is no matched node. */ public int match(Uri uri){ final List<String> pathSegments = uri.getPathSegments(); final int li = pathSegments.size(); UriMatcher node = this; if (li == 0 && uri.getAuthority() == null) { return this.mCode; } for (int i = -1; i < li; i++) { String u = i < 0 ? uri.getAuthority() : pathSegments.get(i); ArrayList<UriMatcher> list = node.mChildren; if (list == null) { break; } node = null; int lj = list.size(); for (int j = 0; j < lj; j++) { UriMatcher n = list.get(j); which_switch: switch (n.mWhich) { case EXACT: if (n.mText.equals(u)) { node = n; } break; case NUMBER: int lk = u.length(); for (int k = 0; k < lk; k++) { char c = u.charAt(k); if (c < '0' || c > '9') { break which_switch; } } node = n; break; case TEXT: node = n; break; } if (node != null) { break; } } if (node == null) { return NO_MATCH; } } return node.mCode; } private static final int EXACT = 0; private static final int NUMBER = 1; private static final int TEXT = 2; private int mCode; private int mWhich; private String mText; private final ArrayList<UriMatcher> mChildren; } 这是android源码. 由于不懂所以就把它粘贴的项目中.所以包自然就改成自己项目的了.. package fkshl.activity.contentProvider; import java.util.HashMap; import java.util.Map; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteQueryBuilder; import android.net.Uri; import android.text.TextUtils; import fkshl.activity.contentProviderMetaData.ContentProviderMetaData; import fkshl.activity.contentProviderMetaData.ContentProviderMetaData.UserTableMetaData; import fkshl.activity.dataBase.DBHelper; public class FkshlContentProvider extends ContentProvider { public static final UriMatcher URI_MATCHER; public static final int FKSHL_TABLE = 1; public static final int FKSHL_TABLE_COLUMN = 2; public static final Map<String, String> COLUM_MAPPIGN; public DBHelper dbHelper; static { /** * uri验证 */ URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH); URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "users", 1); URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "users/#", 2); /** * 列的映射 */ COLUM_MAPPIGN = new HashMap<String, String>(); COLUM_MAPPIGN.put(UserTableMetaData._ID, UserTableMetaData._ID); COLUM_MAPPIGN.put(UserTableMetaData.COLUMN_NAME, UserTableMetaData.COLUMN_NAME); } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { // TODO Auto-generated method stub return 0; } @Override public String getType(Uri uri) { // TODO Auto-generated method stub switch (URI_MATCHER.match(uri)) { case FKSHL_TABLE: return UserTableMetaData.CONTENT_TYPE; case FKSHL_TABLE_COLUMN: return UserTableMetaData.CONTENT_TYPE_ITEM; default: throw new IllegalArgumentException("Unknown URI!!!!!" + uri); } } @Override public Uri insert(Uri uri, ContentValues values) { // TODO Auto-generated method stub SQLiteDatabase database = dbHelper.getWritableDatabase(); Long rowId = database.insert(ContentProviderMetaData.TABLE_NAME, null, values); if (rowId > 0) { Uri empuri = ContentUris.withAppendedId(UserTableMetaData.CONTENT_URI, rowId); getContext().getContentResolver().notifyChange(empuri, null); System.out.println("insert success!!!"); } return null; } @Override public boolean onCreate() { // TODO Auto-generated method stub dbHelper = new DBHelper(getContext(), ContentProviderMetaData.DATABASE_NAME); dbHelper.getReadableDatabase(); System.out.println("create database success!!"); return true; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteQueryBuilder builder = new SQLiteQueryBuilder(); // TODO Auto-generated method stub switch (URI_MATCHER.match(uri)) { case FKSHL_TABLE: builder.setTables(UserTableMetaData.TABLE_NAME); builder.setProjectionMap(COLUM_MAPPIGN); break; case FKSHL_TABLE_COLUMN: builder.setTables(UserTableMetaData.TABLE_NAME); builder.setProjectionMap(COLUM_MAPPIGN); builder.appendWhere(UserTableMetaData.COLUMN_NAME + "=" + uri.getPathSegments().get(1)); break; default: throw new IllegalArgumentException("uri error !!!!" + uri); } String orderBy; if (TextUtils.isEmpty(sortOrder)) { orderBy = UserTableMetaData.ORDER_BY + " Desc"; } else { orderBy = sortOrder; } SQLiteDatabase database = dbHelper.getReadableDatabase(); Cursor c = builder.query(database, projection, selection, selectionArgs, null, null, orderBy); c.setNotificationUri(getContext().getContentResolver(), uri); System.out.println("seach end!!!!"); return c; } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { // TODO Auto-generated method stub return 0; } } 做的时间发现一个问题. 这是之前发现在按官方提示做的. URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "/users", 1); URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "/users/#", 2); 可是在getType中怎么都走default.都是抛异常. 05-22 09:39:23.449: ERROR/AndroidRuntime(581): java.lang.IllegalArgumentException: uri error !!!!content://fkshl.activity.contentProvider.FkshlContentProvider/users 最后看了源码,改成了. URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "users", 1); URI_MATCHER.addURI(ContentProviderMetaData.AUTHORIY, "users/#", 2); 这样就好. 原因是在add方法中它会以"/"分隔users/#,然后把分隔后的字符串像树型的一级一级保存在mChildren中.如果在users/#前面加"/",哪么就导致在"/"之前有一个空字符(content://fkshl.activity.contentProvider.FkshlContentProvider//users),而在我的项目中调用getType方法传过来时的uir中没有这样的一个空字符(content://fkshl.activity.contentProvider.FkshlContentProvider/users) 没有.