DiskCache.java

package com.xiangyixie.picshouse.Cache;

import android.content.Context;

import java.io.File;


public class DiskCache {

    private File cacheDir;

    public DiskCache(Context context) {
        //Find the dir to save cached images
        if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
            cacheDir = new File(android.os.Environment.getExternalStorageDirectory(), "PicsHouse");
        else
            cacheDir = context.getCacheDir();
        if (!cacheDir.exists())
            cacheDir.mkdirs();
    }

    public File getFile(String url) {
        //identify images by hashcode. Not a perfect solution, good for the demo.
        String filename = String.valueOf(url.hashCode());
        //Another possible solution (thanks to grantland)
        //String filename = URLEncoder.encode(url);
        File f = new File(cacheDir, filename);
        return f;
    }

    public void clear() {
        File[] files = cacheDir.listFiles();
        if (files == null){
            return;
        }
        for (File f : files){
            f.delete();
        }
    }
}