Android-文件选择获取的uri转换真实路径

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更新方法到Android4.4版本以上。

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文件选择

系统提供了一个文件选择的界面

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");//选择的文件类型：全部 */*
startActivityForResult(imageIntent,requestCode);//requestCode:请求码

文件回调

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Uri Uri= data.getData();
//........
}

通过文件的uri来获取文件路径，在4.4以下版本和4.4及以后版本的查询方式是不同的,现在做以下封装，以作记录。

    /**
     * 根据Uri获取文件的绝对路径，解决Android4.4以上版本Uri转换
     *
     * @param fileUri
     */
    @TargetApi(19)
    public static String getPath2uri(Activity context, Uri fileUri) {
        if (context == null || fileUri == null)
            return null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, fileUri)) {
            if (isExternalStorageDocument(fileUri)) {
                String docId = DocumentsContract.getDocumentId(fileUri);
                String[] split = docId.split(":");
                String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            } else if (isDownloadsDocument(fileUri)) {
                String id = DocumentsContract.getDocumentId(fileUri);
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
                return getDataColumn(context, contentUri, null, null);
            } else if (isMediaDocument(fileUri)) {
                String docId = DocumentsContract.getDocumentId(fileUri);
                String[] split = docId.split(":");
                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;
                }
                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = new String[] { split[1] };
                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        } // MediaStore (and general)
        else if ("content".equalsIgnoreCase(fileUri.getScheme())) {
            // Return the remote address
            if (isGooglePhotosUri(fileUri))
                return fileUri.getLastPathSegment();
            return getDataColumn(context, fileUri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(fileUri.getScheme())) {
            return fileUri.getPath();
        }
        return null;
    }

    /**
     * Android4.4 （<19）以下版本获取uri地址方法
     * @param context           上下文
     * @param uri               返回的uri
     * @param selection         条件
     * @param selectionArgs     值
     * @return                  uri文件所在的路径
     */
    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        String[] projection = { MediaStore.Images.Media.DATA };
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri  The Uri to check.
     * @return
     *      URI权限是否为ExternalStorageProvider
     *      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
     *      URI权限是否为google图片
     *      Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }

    /**
     * @param uri   The Uri to check.
     * @return
     *      URI权限是否为DownloadsProvider.
     *      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
     *      URI权限是否为MediaProvider.
     *      Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }