如何显示特定文件夹中的最后拍摄图像？

Question

I want to make a feature like default camera feature did. There are a left thumbnail image which show last taken image. When click to the photo, it show the photo and I can slide to view next photo.

My photos is put on "Abc/Pictures" folder.

Answer 1

To get the latest modified file in folder for specific extension

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.comparator.LastModifiedFileComparator;
import org.apache.commons.io.filefilter.WildcardFileFilter;

...

    /* Get the newest file for a specific extension */
    public File getTheNewestFile(String filePath, String ext) {
        File theNewestFile = null;
        File dir = new File(filePath);
        FileFilter fileFilter = new WildcardFileFilter("*." + ext);
        File[] files = dir.listFiles(fileFilter);

        if (files.length > 0) {
            /** The newest file comes first **/
            Arrays.sort(files, LastModifiedFileComparator.LASTMODIFIED_REVERSE);
            theNewestFile = files[0];
        }

        return theNewestFile;
    }

Addition

To get all files or only png and jpeg use

new WildcardFileFilter("*.*");
new WildcardFileFilter(new String[]{"*.png", "*.jpg"});

Answer 2

Use below code find latest images from folder and I hope you are saving images with there time stamp which is standard appraoch.

File path = new File(Environment.getExternalStorageDirectory()
        .getPath() + "/Abc/Pictures"); 



    int imagesCount= path .listFiles().length; // get the list of images from folder
       Bitmap bmp = BitmapFactory.decodeFile(sdcardPath.listFiles()[imagesCount - 1].getAbsolutePath());
       eachImageView.setImageBitmap(bmp); // set bitmap in imageview