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在webview中选择图片一般是设置WebChromeClient,然后重写openFileChooser方法,最后在onActivityResult中得到图片Uri
问题来了,这个Uri一般都没有文件后缀(.jpg.png),像下面这样
filecontent://media/external/images/media/68987
将图片上传到服务器后,保存在服务器的文件名字就是68987了,文件没有后缀,将后缀改为.jpg之后,图片是正确的,,,
遇到这个问题排查了一天
解决方式
根据 Uri 获取文件的真实路径, 然后再把真实路径转成 Uri. 这时候的 Uri 就是带文件真实名和后缀的.
// 根据 Uri 获取文件真实路径的代码: https://gist.github.com/atearsan/1f0846e6dcdb3d8f3d1d// 真实路径转成 Uri 的代码: Uri.fromFile(new File(filePath));
// Uri 打印结果: file:///storage/emulated/0/DCIM/Camera/IMG_20151006_193049.jpg // 根据 Uri 获取文件真实路径的代码package com.atearsan.util;import android.annotation.TargetApi;import android.content.ContentUris;import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Build;import android.os.Environment;import android.provider.DocumentsContract;import android.provider.MediaStore;// Code taken from: http://stackoverflow.com/questions/20067508/get-real-path-from-uri-android-kitkat-new-storage-access-frameworkpublic class MediaUtility { /** * Get a file path from a Uri. This will get the the path for Storage Access * Framework Documents, as well as the _data field for the MediaStore and * other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @author paulburke */ @TargetApi(Build.VERSION_CODES.KITKAT) public static String getPath(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } // TODO handle non-primary volumes } // DownloadsProvider else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } // MediaProvider else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[]{split[1]}; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @param selection (Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } 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()); }}
以下做一下科普:
一、URI
通用资源标志符(Universal Resource Identifier, 简称"URI")。
Uri代表要操作的数据,Android上可用的每种资源 - 图像、视频片段等都可以用Uri来表示。
URI一般由三部分组成:
访问资源的命名机制。
存放资源的主机名。
资源自身的名称,由路径表示。
Android的Uri由以下三部分组成: "content://"、数据的路径、标示ID(可选)
举些例子,如:
所有联系人的Uri: content://contacts/people
某个联系人的Uri: content://contacts/people/5
所有图片Uri: content://media/external
某个图片的Uri:content://media/external/images/media/4
二、内部保存
首先我们来看一下android是如何管理多媒体文件(音频、视频、图片)的信息。通过DDMS,我们在/data/data/com.android.providers.media下找到数据库文件
打开external.db文件进一步查看:在media表格下,可以看到文件路径(_data)和Uri的标示ID(_id)的对应关系。
三、相互转换
1.从URI获得文件路径
1 string myImageUrl = "content://media/external/images/media/***"; 2 Uri uri = Uri.parse(myImageUrl); 3 4 5 String[] proj = { MediaStore.Images.Media.DATA }; 6 Cursor actualimagecursor = this.ctx.managedQuery(uri,proj,null,null,null); 7 int actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 8 actualimagecursor.moveToFirst(); 9 10 11 String img_path = actualimagecursor.getString(actual_image_column_index); 12 File file = new File(img_path);13 Uri fileUri = Uri.fromFile(file);
2.由文件路径得到URI
1 Uri mUri = Uri.parse("content://media/external/images/media"); 2 Uri mImageUri = null; 3 4 Cursor cursor = managedQuery( 5 MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, 6 null, MediaStore.Images.Media.DEFAULT_SORT_ORDER); 7 cursor.moveToFirst(); 8 9 while (!cursor.isAfterLast()) {10 String data = cursor.getString(cursor11 .getColumnIndex(MediaStore.MediaColumns.DATA));12 if (picPath.equals(data)) {13 int ringtoneID = cursor.getInt(cursor14 .getColumnIndex(MediaStore.MediaColumns._ID));15 mImageUri = Uri.withAppendedPath(mUri, ""16 + ringtoneID);17 break;18 }19 cursor.moveToNext();20 }
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