如何删除任何特定文件夹中的最新文件中的SD卡在android系统？ [英] How to delete the latest file from any specific folder in sdcard in android?

问题描述

我创建一个摄像头application.Through这个我能捕捉到图像并将其存储到在此过程中的特定folder.but，图像获得存储在其默认位置说 SD卡/ DCIM / CAMERA

I am creating a camera application.Through this I am able to capture the image and storing it into a specific folder.but during this process,the image is getting stored in its default position say sdcard/DCIM/CAMERA.

文件名是当前date.when用户点击保存按钮，然后取当前日期和文件名是generated.So我不能够检测到的文件名。

The file name is current date.when user clicks on save button,then the current date is taken and the filename is generated.So i am not able to detect the file name.

有谁能够表明我如何访问的文件名或如何编程删除最新的图像文件。

推荐答案

我假设你知道如何获取全部文件，从文件对象目录上下工夫。从那里开始使用此方法来检索最后修改的文件：

I assume you know how to retrieve all files as File objects from the directory to work on. Starting from there use this method to retrieve the last modified file:

public static File getLastModifiedFile( File[] allFiles ) [
    File result = allFiles[1];
    //you cou also use result = null and uncomment the
    //other if-statement. It's probably the first idea but in that case you might
    //return null while here you'll get an exception which makes debugging easier :)

    for( int i = 0; i < allFiles.length; i++ ) {
        if( result.lastModified() < allFiles[i].lastModified() ) {
        //if( result == null || result.lastModified() < allFiles[i].lastModified() ) {
            result = currentFile;
        }
    ]
    return result;
}

有一个看文件文档。在这里，你会发现的explenation 上次更改时间（）。

Have a look at the File documentation. Here you'll find the explenation of lastModified().

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