如何解决多个内容提供商？

问题描述

我创建了相同的SQLite数据库的两个不同的表的工作，两个内容提供商。他们分享 SQLiteOpenHelper 的单个实例作为的职位描述。每个内容提供商注册在的Andr​​oidManifest.xml 如下：

I created two content providers that work on two different tables of the same SQLite database. They share a single instance of SQLiteOpenHelper as described in the post of Ali Serghini. Each content provider is registered in AndroidManifest.xml as follows.

<provider
    android:name=".contentprovider.PostsContentProvider"
    android:authorities="com.example.myapp.provider"
    android:exported="false"
    android:multiprocess="true" >
</provider>
<provider
    android:name=".contentprovider.CommentsContentProvider"
    android:authorities="com.example.myapp.provider"
    android:exported="false"
    android:multiprocess="true" >
</provider>

每个内容提供者定义所需的内容URI和提供一个 UriMatcher 。

Each content provider defines the needed content URIs and supplies an UriMatcher.

public class PostsProvider extends BaseContentProvider {

    private static final UriMatcher sUriMatcher = buildUriMatcher();
    private static final int POSTS = 100;
    private static final int POST_ID = 101;

    private static UriMatcher buildUriMatcher() {
        final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
        final String authority = CustomContract.CONTENT_AUTHORITY;
        matcher.addURI(authority, DatabaseProperties.TABLE_NAME_POSTS, POSTS);
        matcher.addURI(authority, DatabaseProperties.TABLE_NAME_POSTS + "/#", POST_ID);
        return matcher;
    }

...

public class CommentsProvider extends BaseContentProvider {

    protected static final UriMatcher sUriMatcher = buildUriMatcher();
    protected static final int COMMENTS = 200;
    protected static final int COMMENT_ID = 201;

    private static UriMatcher buildUriMatcher() {
        final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
        final String authority = CustomContract.CONTENT_AUTHORITY;
        matcher.addURI(authority, DatabaseProperties.TABLE_NAME_COMMENTS, COMMENTS);
        matcher.addURI(authority, DatabaseProperties.TABLE_NAME_COMMENTS + "/#", COMMENT_ID);
        return matcher;
    }

当我调用的内容解析插入上岗， PostsContentProvider 为目标。当我尝试插入注释，但是，内容解析器做的不可以参考 CommentsContentProvider 如预期，但在该 PostsContentProvider 。其结果是，我扔在以下异常 PostsContentProvider 。

When I invoke the content resolver to insert posts, the PostsContentProvider is targeted. When I try to insert comments, however, the content resolver does not refer to the CommentsContentProvider as expected, but calls upon the PostsContentProvider. The result is the following exception which I throw in the PostsContentProvider.

UnsupportedOperationException: Unknown URI: content://com.example.myapp.provider/comments

是否有可能输出目前与内容提供商注册？所有可用的内容的URI

Is it possible to output all available content URIs currently registered with an content provider?

推荐答案

在安卓当局必须是唯一的每个内容提供商。该文档是这里从文档引用

The android:authorities needs to be unique for each content provider. The documentation is herequoted from doc

的含量：方案标识为属于一个内容的数据  供应商和授权（com.example.project.healthcareprovider）  识别特定的提供者。因此，当局必须  独一无二的。

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