Android 文件绝对路径和Content开头的Uri互相转换

https://www.jianshu.com/p/02fa61d8dbf5

工作中遇到的问题。拍照获取图片后是得到的路径是

file:///storage/emulated/0/Android/data/com.zehin.mingchuliangzao3/cache/PostPicture/20160905182015.jpg

但是我想要的路径是：

content://media/external/images/media/212304

这种 Uri类型的

查阅资料找到如下方法

转Uri

/**
     * Gets the content:// URI from the given corresponding path to a file
     * 
     * @param context
     * @param imageFile
     * @return content Uri
     */
    public static Uri getImageContentUri(Context context, java.io.File imageFile) {
        String filePath = imageFile.getAbsolutePath();
        Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                new String[] { MediaStore.Images.Media._ID }, MediaStore.Images.Media.DATA + "=? ",
                new String[] { filePath }, null);
        if (cursor != null && cursor.moveToFirst()) {
            int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
            Uri baseUri = Uri.parse("content://media/external/images/media");
            return Uri.withAppendedPath(baseUri, "" + id);
        } else {
            if (imageFile.exists()) {
                ContentValues values = new ContentValues();
                values.put(MediaStore.Images.Media.DATA, filePath);
                return context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            } else {
                return null;
            }
        }
    }

Uri转绝对路径

/** 
     * Gets the corresponding path to a file from the given content:// URI 
     * @param selectedVideoUri The content:// URI to find the file path from 
     * @param contentResolver The content resolver to use to perform the query. 
     * @return the file path as a string 
     */  
    public static String getFilePathFromContentUri(Uri selectedVideoUri,  
            ContentResolver contentResolver) {  
        String filePath;  
        String[] filePathColumn = {MediaColumns.DATA};  
  
        Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);  
//      也可用下面的方法拿到cursor  
//      Cursor cursor = this.context.managedQuery(selectedVideoUri, filePathColumn, null, null, null);  
          
        cursor.moveToFirst();  
  
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);  
        filePath = cursor.getString(columnIndex);  
        cursor.close();  
        return filePath;  
    }  

绝对路径转Uri的那个方法 目前是图片文件的转换 转其他文件 只要把content后面的目录换成对应文件的归属目录就行了。。

作者：青檬可乐_
链接：https://www.jianshu.com/p/02fa61d8dbf5
來源：简书
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