urimatcher无法使用预填充的数据库

我试图使用SQLiteAssetHelper将预填充的SQLITE表添加到我的内容提供者,但uri匹配器不匹配。 我可以通过标准SQL访问/修改表,但使用游标加载器会引发异常。 以下是内容提供者/光标加载器中的相关代码。

//内容提供者代码

private PantryDbHelper dbHelper;

private static final int PANTRY = 1;
private static final int INFO = 5;

public static final String AUTHORITY =“com.battlestarmathematica.stayfresh.pantryprovider”;

//path to db
public static final String URL = "content://" + AUTHORITY;
public static final Uri CONTENT_URI = Uri.parse(URL);
public static final Uri CONTENT_URI_PANTRY = Uri.withAppendedPath(CONTENT_URI,"pantry");
public static final Uri CONTENT_URI_INFO = Uri.withAppendedPath(CONTENT_URI,"info");

static final UriMatcher uriMatcher;

static {
    uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    uriMatcher.addURI(AUTHORITY,"info",INFO);
    uriMatcher.addURI(AUTHORITY, "pantry", PANTRY);
}

public Cursor query(@NonNull Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder){
    SQLiteDatabase db = dbHelper.getReadableDatabase();

    SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
        switch (uriMatcher.match(uri)) {
            case PANTRY:
                builder.setTables(PantryContract.PANTRY_TABLE_NAME);
                break;
            case INFO:
                builder.setTables("info");
            default:
                throw new IllegalArgumentException("Unsupported URI " + uri);
        }

//光标加载器代码

public Loader<Cursor> onCreateLoader(int id, Bundle args){
    return new CursorLoader(
            //context
            this,
            //content URI
            PantryContentProvider.CONTENT_URI_INFO,
            //columns to return
            new String[] {"_id","itemname"},
            //selection
            null,
            //selection args
            null,
            //sort order
            "itemname");
}

我知道游标加载器的工作原理,因为我使用完全相同的代码来完成与食品室uri的其他活动,并且它完美地工作。 当我尝试使用info uri加载它时,虽然我得到这个异常。

java.lang.IllegalArgumentException:不支持的URI内容://com.battlestarmathematica.stayfresh.pantryprovider/info

任何帮助将不胜感激。


你只是在代码中缺少一个break语句。

UriMatcher匹配并且switch语句跳转到case INFO: ,但是因为没有break; default: case也被执行。

尝试替换它

        case INFO:
            builder.setTables("info");
        default:
            throw new IllegalArgumentException("Unsupported URI " + uri);

这样:

        case INFO:
            builder.setTables("info");
            break;
        default:
            throw new IllegalArgumentException("Unsupported URI " + uri);
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