Android7.0以上Uri转路径的方法(已验证)
作者:互联网
网络上看到过很多种Uri转路径的方法,可基本上都只适用于很少的Uri值,可能没有结果(例如,对于由MediaStore索引的非本地文件),也可能没有可用的结果(例如,对于可移动存储上的文件)。
解决方法
使用ContentResolver和openInputStream()在Uri标识的内容上获取InputStream。在控制的文件上使用InputStream和FileOutputStream复制内容,然后使用该文件。
代码如下:
private static String getFilePathForN(Context context, Uri uri) { try { Cursor returnCursor = context.getContentResolver().query(uri, null, null, null, null); int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME); returnCursor.moveToFirst(); String name = (returnCursor.getString(nameIndex)); File file = new File(context.getFilesDir(), name); InputStream inputStream = context.getContentResolver().openInputStream(uri); FileOutputStream outputStream = new FileOutputStream(file); int read = 0; int maxBufferSize = 1 * 1024 * 1024; int bytesAvailable = inputStream.available(); int bufferSize = Math.min(bytesAvailable, maxBufferSize); final byte[] buffers = new byte[bufferSize]; while ((read = inputStream.read(buffers)) != -1) { outputStream.write(buffers, 0, read); } returnCursor.close(); inputStream.close(); outputStream.close(); return file.getPath(); } catch (Exception e) { e.printStackTrace(); } return null; }
附上全系统的代码:
/** * 文件Uri转路径(兼容各品牌手机) */ public class PathUtils { /** * android7.0以上处理方法 */ private static String getFilePathForN(Context context, Uri uri) { try { Cursor returnCursor = context.getContentResolver().query(uri, null, null, null, null); int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME); returnCursor.moveToFirst(); String name = (returnCursor.getString(nameIndex)); File file = new File(context.getFilesDir(), name); InputStream inputStream = context.getContentResolver().openInputStream(uri); FileOutputStream outputStream = new FileOutputStream(file); int read = 0; int maxBufferSize = 1 * 1024 * 1024; int bytesAvailable = inputStream.available(); int bufferSize = Math.min(bytesAvailable, maxBufferSize); final byte[] buffers = new byte[bufferSize]; while ((read = inputStream.read(buffers)) != -1) { outputStream.write(buffers, 0, read); } returnCursor.close(); inputStream.close(); outputStream.close(); return file.getPath(); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 全平台处理方法 */ public static String getPath(final Context context, final Uri uri) throws Exception { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; final boolean isN = Build.VERSION.SDK_INT >= Build.VERSION_CODES.N; if (isN) { return getFilePathForN(context, uri); } // 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]; } } // DownloadsProvider else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), StringUtils.toLong(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; } /** * 获取此Uri的数据列的值。这对于MediaStore uri和其他基于文件的内容提供程序非常有用。 */ 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); } } catch (IllegalArgumentException e){ //do nothing } finally { if (cursor != null) cursor.close(); } return null; } public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } }
参考资料:https://stackoverflow.com/questions/42508383/illegalargumentexception-column-data-does-not-exist
标签:return,String,验证,uri,Uri,Android7.0,context,null,final 来源: https://www.cnblogs.com/kangweifeng/p/11264217.html