在 android 目录中过滤文件

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;
    }

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;
}
if (file.getAbsolutePath().endsWith(".jpg")) {
tFileList.add(file.getPath());

}

你可以使用 FilenameFilter 接口来过滤文件。
把代码:File[] files=f.listFiles();
改成:

File[] jpgfiles = f.listFiles(new FilenameFilter() {
    public boolean accept(File dir, String name)
    {
        return (name.endsWith(".jpg")||name.endsWith(".jpeg")); 
    }
});