在Android上的目录中过滤文件 [英] Filtering files in a directory on Android

问题描述

在我的应用中，我从图库中的文件夹中获取图像并将其保存到数组列表中.现在我只想提取扩展名为.jpg的文件.我该怎么做

保存到数组列表的代码是

 私有列表< String>ReadSDCard(){//必须与SDCard中的目录匹配文件f =新文件("sdcard/data/crak")；File [] files = f.listFiles();for(int i = 0; i< files.length; i ++){文件file = files [i];/*假定路径中的所有文件均为受支持的类型*/tFileList.add(file.getPath());}返回tFileList;} 

解决方案

使用 Java字符串类中的 .endsWith()方法从文件路径中检查文件扩展名./p>

方法:

 公共布尔endsWith(带字符串后缀) 

您的代码类似

 私有列表< String>ReadSDCard(){//必须与SDCard中的目录匹配文件f =新文件("sdcard/data/crak")；File [] files = f.listFiles();for(int i = 0; i< files.length; i ++){文件file = files [i];/*假定路径中的所有文件均为受支持的类型*/字符串filePath = file.getPath();if(filePath.endsWith(.jpg"))//检查.jpg文件扩展名的条件tFileList.add(filePath);}返回tFileList;} 

In my app i am getting the images from a folder in gallery and saving it into an array list.Now i want to extract only the files with .jpg extension.How can i do it

The code for saving to array list is

  private List<String> ReadSDCard()
    {
     //It have to be matched with the directory in SDCard
     File f = new File("sdcard/data/crak");

     File[] files=f.listFiles();

     for(int i=0; i<files.length; i++)
     {
      File file = files[i];
      /*It's assumed that all file in the path are in supported type*/
      tFileList.add(file.getPath());
     }
     return tFileList;
    }

解决方案

Use .endsWith() method from Java String Class to check File Extension from file path.

Method:

public boolean endsWith(String suffix)

Your Code something like,

private List<String> ReadSDCard()
{
     //It have to be matched with the directory in SDCard
     File f = new File("sdcard/data/crak");

     File[] files=f.listFiles();

     for(int i=0; i<files.length; i++)
     {
      File file = files[i];
      /*It's assumed that all file in the path are in supported type*/
      String filePath = file.getPath();
      if(filePath.endsWith(".jpg")) // Condition to check .jpg file extension
      tFileList.add(filePath);
     }
 return tFileList;
}

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