在 android 目录中过滤文件

Question

我从图像库文件夹中获取图像，并把它保存在一个数组列表中。现在我只想提取有.jpg扩展的文件。如何实现呢？

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;
    }

Answer 1

使用 Java String 类中的.endsWith()方法来检查文件路径中的 File Extension。
Method:

public boolean endsWith(String suffix)

代码如下：

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;
}