Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.content.Context;
import android.net.Uri;

import java.io.File;
import java.security.MessageDigest;

public class Main {
    private static final char[] HEX_ARRAY = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

    /**
     * Get a reference to a copied file
     * @param context Application Context
     * @param imageUri Source URI of an image
     * @return Reference to a copied file
     */
    public static File getCopiedFile(Context context, String imageUri) {
        String filename;

        try {
            filename = String.format("%s.png", md5(imageUri));

        } catch (Exception e) {
            filename = Uri.parse(imageUri).getLastPathSegment();
        }

        File workingDir = getWorkingDir(context);
        File f = null;

        if (workingDir != null && workingDir.exists()) {
            f = new File(workingDir, filename);
        }

        return f;
    }

    private static String md5(String message) throws Exception {
        MessageDigest md = MessageDigest.getInstance("md5");
        return bytesToHex(md.digest(message.getBytes("utf-8")));
    }

    /**
     * Get APNG working directory
     * @param context Application Context
     * @return Reference to the working directory
     */
    public static File getWorkingDir(Context context) {
        File workingDir = null;
        File cacheDir = context.getExternalCacheDir();

        if (cacheDir == null) {
            cacheDir = context.getCacheDir();
        }

        if (cacheDir != null) {
            workingDir = new File(String.format("%s/apng/.nomedia/", cacheDir.getPath()));

            if (!workingDir.exists()) {
                workingDir.mkdirs();
            }
        }

        return workingDir;
    }

    private static String bytesToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        int v;
        for (int j = 0; j < bytes.length; j++) {
            v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_ARRAY[v >>> 4];
            hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
        }
        return new String(hexChars);
    }
}