Question

如果我单击按钮，我有一个代码来获取图像，在我的问题中，我想获取图像的URI /路径并将其发送到数据库中，之后我想在ImageView中显示它。这是我的代码。

dependency:purge-local-repository

Answer 1

您可以使用String strUri = uri.toString()将Uri转换为String将此strUri保存到数据库，在从数据库检索时，您可以使用Uri uri = Uri.parse(strUri)将字符串转换回Uri

Answer 2

我使用这些方法从URI

获取路径

private String getActualFilePath(Context context, Uri fileUri) throws URISyntaxException{
    Uri uri = Uri.parse(fileUri);
    final boolean needToCheckUri = Build.VERSION.SDK_INT >= 19;
    String selection = null;
    String[] selectionArgs = null;
    // Uri is different in versions after KITKAT (Android 4.4), we need to
    // deal with different Uris.
    if (needToCheckUri && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) {
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            return Environment.getExternalStorageDirectory() + "/" + split[1];
        } else if (isDownloadsDocument(uri)) {
            final String id = DocumentsContract.getDocumentId(uri);
            uri = ContentUris.withAppendedId(
                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
        } else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];
            if ("image".equals(type)) {
                uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }
            selection = "_id=?";
            selectionArgs = new String[]{ split[1] };
        }
    }
    if ("content".equalsIgnoreCase(uri.getScheme())) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = null;
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            if (cursor.moveToFirst()) {
                return cursor.getString(column_index);
            }
        } catch (Exception e) {
        }
    } else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }
    return null;
}
 /**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is ExternalStorageProvider.
 */
public static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is DownloadsProvider.
 */
public static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is MediaProvider.
 */
public static boolean isMediaDocument(Uri uri) {
    return "com.android.providers.media.documents".equals(uri.getAuthority());
}
 private void LogException(Exception ex){
    if(ex != null){
        try{
            ex.printStackTrace(logPrintWriter);
            String data = logStringWriter.toString();

            AddErrorLogEntry(data);
        }finally {
            Log.d(TAG, "Logged exception in file");
        }
    }
 }

如何获取图像路径（URI）并将其发送到数据库？

2 个答案: