Photoshop script to output Android XHDPI, HDPI, MDPI, and LDPI PNGs

Output Android Assets.jsx

// Output Android Assets.jsx
// 2012 Todd Linkner
// License: none (public domain)
// v1.0
//
// This scrip is for Photoshop CS6. It outputs Android XHDPI, HDPI, MDPI, 
// and LDPI PNG assets from HDPI source files. The resulting PNGs will be
// placed in sub-folders within your target folder.

/*
// BEGIN__HARVEST_EXCEPTION_ZSTRING
<javascriptresource>
<name>$$$/JavaScripts/OutputAndroidAssets/MenuAlt=Output Android Assets</name>
<category>mobile</category>
</javascriptresource>
// END__HARVEST_EXCEPTION_ZSTRING
*/

// bring Photoshop into focus
#target photoshop

main();

function main() {

    var cleanup = confirm("This script outputs Android XHDPI, HDPI, MDPI, "
                        + "and LDPI PNG assets from HDPI source files.\r\r"
                        + "Do you want to delete your original files when "
                        + "complete?");
    
    // Ask user for input folder
	var inputFolder = Folder.selectDialog("Select a folder to process");
	if (inputFolder == null) throw "No folder selected. Exting script.";

	// get all files in the input folder
	var fileList = inputFolder.getFiles("*.png");

	// Make output folders
	var dirxhdpi = Folder(inputFolder+"/drawable-xhdpi");
	if(!dirxhdpi.exists) dirxhdpi.create();
	var dirhdpi = Folder(inputFolder+"/drawable-hdpi");
	if(!dirhdpi.exists) dirhdpi.create();
	var dirmdpi = Folder(inputFolder+"/drawable-mdpi");
	if(!dirmdpi.exists) dirmdpi.create();
	var dirldpi = Folder(inputFolder+"/drawable-ldpi");
	if(!dirldpi.exists) dirldpi.create();

	// Open each file in turn
	for (var i = 0; i < fileList.length; i++) {
		// Open file
		open(fileList[i]);
		// Make XHDPI
		resize(dirxhdpi);
		// Make HDPI
		resize(dirhdpi,'75%');
		// Make MDPI
		resize(dirmdpi,'50%');
		// Close and do not save
		// Make LDPI
		resize(dirldpi,'37.5%');
		app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
		// Delete the original
		if (cleanup) fileList[i].remove();
	}
    alert("Done!");
}

function resize(dir,percent) {
    // Setup file name
    var fname = app.activeDocument.name.replace(/\s+/g, '_').replace(/([a-z\d])([A-Z])/g, '$1_$2').toLowerCase();

    // Set export options
    var opts, file;
    opts = new ExportOptionsSaveForWeb();
    opts.format = SaveDocumentType.PNG;
    opts.PNG8 = false; 
    opts.transparency = true;
    opts.interlaced = 0;
    opts.includeProfile = false;
    opts.optimized = true;

    // Duplicate, resize and export
    var tempfile = app.activeDocument.duplicate();
    if (undefined != percent) tempfile.resizeImage(percent,percent);
    file = new File(dir+"/"+fname);
    tempfile.exportDocument(file, ExportType.SAVEFORWEB, opts);
    tempfile.close(SaveOptions.DONOTSAVECHANGES);
}