如何在我的资产中获取适用于 SearchManager.SUGGEST_COLUMN_ICON_1 列的图像的 Uri?

问题描述

我已成功将应用的国家/地区搜索集成到全球搜索工具中，现在我正尝试在搜索建议旁边显示每个国家/地区的国旗.在我的应用程序中搜索以这种方式工作，但当然我可以自己控制列表及其视图绑定.所以我知道所有标志都在那里，我可以在我的应用程序的其余部分使用它们.

I have successfully integrated my app's country search into the global search facility and now I am trying to display each country's flag next to the search suggestions. Search inside my app works this way but of course I have control of the list and its view binding myself. So I know the flags are all there and I can use them in the rest of my app.

当我尝试为资产中的 .gif 文件提供 Uri 时，问题就出现了.根据搜索文档，键为 SearchManager.SUGGEST_COLUMN_ICON_1 的列的值应该是图像的 Uri.

The trouble comes when I try to supply a Uri to a .gif file in my Assets. According to the search documentation the value of the column with the key SearchManager.SUGGEST_COLUMN_ICON_1 should be a Uri to the image.

下面是代码的样子.响应 ContentProvider 方法 public Cursor query (Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) 我正在创建一个 MatrixCursor 将我所在国家/地区数据库中的列映射到搜索工具所需的列.国家/地区名称显示正常，我可以选择它们并在我的应用程序中正确响应.

Below is what the code looks like. In response to the ContentProvider method public Cursor query (Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) I am creating a MatrixCursor that maps columns from my country database to those required by the search facility. The country names show up fine and I can select them and correctly respond in my application.

我尝试通过三种不同的方式形成 Uri:

I have tried forming the Uri three different ways:

//                    String flagUri = "file:///android_asset/" + flagPath;
//                    String flagUri = "file:///assets/" + flagPath;
                    String flagUri = "android.resource://com.lesliesoftware.worldinfo.WorldInfoActivity/assets/" + flagPath;
                    columnValues.add (flagUri);

它们都导致了同样的事情——我可以通过使用空字符串值来获得每个建议旁边的应用程序图标.

They all lead to the same thing - my application icon next to each suggestion which I can get by using a value of empty string.

有一个可以工作的 Uri 吗?如何在搜索建议旁边获得国旗图标?

Is there a Uri that will work? How can I get the country flag icon next to the search suggestions?

谢谢伊恩

完整来源:

private Cursor search (String query, int limit)  {
    query = query.toLowerCase ();
    String[] requestedColumns = new String[]  {
            BaseColumns._ID, 
            SearchManager.SUGGEST_COLUMN_TEXT_1,
            SearchManager.SUGGEST_COLUMN_ICON_1,
    };
    String[] queryColumns = new String[]  {
            WorldInfoDatabaseAdapter.KEY_ROWID, 
            WorldInfoDatabaseAdapter.KEY_COUNTRYNAME,
            WorldInfoDatabaseAdapter.KEY_COUNTRYCODE
    };

    return packageResults (query, requestedColumns, queryColumns, limit);
}


private Cursor packageResults (String query, String[] requestedColumns, String[] queryMappedColumns, int limit)  {
    if (requestedColumns.length != queryMappedColumns.length)
        throw new IllegalArgumentException ("Internal error: requested columns do not map to query columns");

    MatrixCursor results = new MatrixCursor (requestedColumns);

    //  Query the country list returns columns: KEY_ROWID, KEY_COUNTRYNAME, KEY_COUNTRYCODE
    Cursor dbResults = myDbHelper.getCountryList (query);

    //  Verify that the query columns are available
    for (int index = 0; index < queryMappedColumns.length; index++)  {
        int col = dbResults.getColumnIndex (queryMappedColumns[index]);
        if (col == -1)
            throw new IllegalArgumentException ("Internal error: requested column '" + 
                    queryMappedColumns[index] + "' was not returned from the database.");
    }

    //  Loop over the database results building up the requested results
    int rowCount = 0;
    while (dbResults.moveToNext ()  &&  rowCount < limit)  {
        Vector<String> columnValues = new Vector<String> ();
        for (int index = 0; index < requestedColumns.length; index++)  {
            if (requestedColumns[index].compareTo (SearchManager.SUGGEST_COLUMN_ICON_1) == 0)  {
                String flagPath = "flags/small/" + dbResults.getString (
                        dbResults.getColumnIndexOrThrow (queryMappedColumns[index]))
                        + "-flag.gif";
//                    String flagUri = "file:///android_asset/" + flagPath;
//                    String flagUri = "file:///assets/" + flagPath;
                String flagUri = "android.resource://com.lesliesoftware.worldinfo.WorldInfoActivity/assets/" + flagPath;
                columnValues.add (flagUri);
            }  else  {
                //  Add the mapped query column values from the database
                String colValue = dbResults.getString (dbResults.getColumnIndexOrThrow (queryMappedColumns[index]));
                columnValues.add (colValue);
            }
        }

        results.addRow (columnValues);
        rowCount++;
    }

    return results;
}

我尝试了其他变体，包括将图像从资产移动到原始文件夹.没有任何效果.这是我尝试过的 uri:

I have tried other variations including moving the images from the assets to the raw folder. Nothing worked. Here are the uri's I tried:

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/raw/flags/small/" + 
    countryCode + "-flag.gif";

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/assets/flags/small/" + 
    countryCode + "-flag.gif";

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/assets/flags/small/" + 
    countryCode + "-flag";

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/raw/" + 
    countryCode + "-flag.gif";

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/raw/" + 
    countryCode + "-flag";

唯一有效的 uri 是我是否将测试标志移动到我的可绘制文件夹中:

The only uri that did work was if I moved a test flag into my drawable folder:

flagUriStr = "android.resource://com.lesliesoftware.worldinfo/" + 
    R.drawable.small_ca_flag;

推荐答案

遗憾的是，经过大量搜索后，我得出的结论是，您无法将图像资产的 uri 返回到搜索工具.我所做的是将我的标志图像移动到资源中(这样它们就不会弄乱我为标志图像创建的库的应用程序资源)并使用资源 uri.因此，在我的提供程序中，我在将数据库结果映射到搜索结果的循环中具有如下所示的代码:

Sadly after much searching around I have reached the conclusion that you cannot return a uri to an image asset to the search facility. What I did instead was move my flag images to the resources (so they do not clutter up my app's resources I created a library for the flag images) and use resource uri's. So, in my provider I have code that looks like this in the loop that maps database results to search results:

            if (requestedColumns[index].compareTo (SearchManager.SUGGEST_COLUMN_ICON_1) == 0)  {
                //  Translate the country code into a flag icon uri
                String countryCode = dbResults.getString (
                        dbResults.getColumnIndexOrThrow (queryMappedColumns[index]));

                int flagImageID = FlagLookup.smallFlagResourceID (countryCode);
                String flagUriStr = "android.resource://com.lesliesoftware.worldinfo/" + flagImageID;
                columnValues.add (flagUriStr);
            }  

并查找如下所示的代码:

and look up code that looks like this:

static public int smallFlagResourceID (String countryCode)  {
    if (countryCode == null || countryCode.length () == 0)
        return R.drawable.flag_small_none;

    if (countryCode.equalsIgnoreCase ("aa"))
        return R.drawable.flag_small_aa;
    else if (countryCode.equalsIgnoreCase ("ac"))
        return R.drawable.flag_small_ac;
    else if (countryCode.equalsIgnoreCase ("ae"))
        return R.drawable.flag_small_ae;
    ...

我只需要确保我创建了一个测试来验证所有有旗帜的国家/地区都返回了预期的结果.

I will just have to make sure I create a test that verifies that all countries that have flags returns the expected results.

这篇关于如何在我的资产中获取适用于 SearchManager.SUGGEST_COLUMN_ICON_1 列的图像的 Uri?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，WP2