如何在Android上检查文件扩展名 [英] How to check file extension on Android

问题描述

在我的应用程序中，当我们从SD卡浏览文件时，这些文件将是.text，.jpg和mpeg4ie视频文件.

In my application, when we browse the file from the SD card, the files will be .text, .jpg and mpeg4ie video files.

我想将每种文件类型存储到一个特定的文件夹中.例如，.text文件转到文本文件夹.选择文件后，如何检查文件扩展名?

I want to store each file type into a particular folder. For example, .text files go to the text folder. When I select the file, how do I check the file extension?

推荐答案

我将以字符串形式获取文件名，并使用."将其拆分为一个数组.作为定界符，然后获取数组的最后一个索引，即文件扩展名.例如:

I would get the file name as a String, split it into an array with "." as the delimiter, and then get the last index of the array, which would be the file extension. For example:

public class main {
    public static void main(String[] args) {
        String filename = "image.jpg";
        String filenameArray[] = filename.split("\\.");
        String extension = filenameArray[filenameArray.length-1];
        System.out.println(extension);
    }
}

哪个输出:

jpg

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