Question

我创建了两个内容提供程序，它们在同一个SQLite数据库的两个不同的表上工作。他们将SQLiteOpenHelper的单个实例共享为described in the post of Ali Serghini。每个内容提供商都在AndroidManifest.xml注册如下。

<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>

每个内容提供商定义所需的内容URI并提供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;
    }

当我调用内容解析程序插入帖子时，PostsContentProvider成为目标。但是，当我尝试插入评论时，内容解析程序不会按预期引用CommentsContentProvider，但会调用PostsContentProvider。结果是我抛出PostsContentProvider。

的以下异常

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

是否可以输出当前向内容提供商注册的所有可用内容URI？

Answer 1

android:authorities对每个内容提供商都必须是唯一的。文档是here 引自doc

内容：方案将数据标识为属于内容提供者和权威（com.example.project.healthcareprovider）标识特定提供者。因此必须是权威唯一的。

如何解决多个内容提供商？

1 个答案: