Utils.java

package com.brady.jlulife.Utils;

import android.graphics.Bitmap;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.TextHttpResponseHandler;

import org.apache.http.Header;

import java.io.ByteArrayOutputStream;
import java.security.MessageDigest;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * Created by brady on 15-9-19.
 */
public class Utils {
    public static byte[] Bitmap2Bytes(Bitmap bmp,boolean needRecycle) {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.PNG, 100, output);
        if (needRecycle) {
            bmp.recycle();
        }

        byte[] result = output.toByteArray();
        try {
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

    public static String getMD5Str(String str)  {
        StringBuffer md5StrBuff = new StringBuffer();
        try {
            MessageDigest messageDigest = null;

            messageDigest = MessageDigest.getInstance("MD5");

            messageDigest.reset();

            messageDigest.update(str.getBytes("UTF-8"));

            byte[] byteArray = messageDigest.digest();


            for (int i = 0; i < byteArray.length; i++) {
                if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
                    md5StrBuff.append("0").append(
                            Integer.toHexString(0xFF & byteArray[i]));
                else
                    md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
            }
        }catch (Exception e){
            e.printStackTrace();
        }

        return md5StrBuff.toString();
    }

    public static Date getFirstDayOfWeek(Date date) {
        Calendar c = new GregorianCalendar();
        c.setFirstDayOfWeek(Calendar.MONDAY);
        c.setTime(date);
        c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday
        return c.getTime();
    }

    public static String gbEncoding(final String gbString) {
        char[] utfBytes = gbString.toCharArray();
        String unicodeBytes = "";
        for (int byteIndex = 0; byteIndex < utfBytes.length; byteIndex++) {
            String hexB = Integer.toHexString(utfBytes[byteIndex]);
            if (hexB.length() <= 2) {
                hexB = "00" + hexB;
            }
            unicodeBytes = unicodeBytes + "\\u" + hexB;
        }
        System.out.println("unicodeBytes is: " + unicodeBytes);
        return unicodeBytes;
    }

    public static String decodeUnicode(final String dataStr) {
        int start = 0;
        int end = 0;
        final StringBuffer buffer = new StringBuffer();
        while (start > -1) {
            end = dataStr.indexOf("\\u", start + 2);
            String charStr = "";
            if (end == -1) {
                charStr = dataStr.substring(start + 2, dataStr.length());
            } else {
                charStr = dataStr.substring(start + 2, end);
            }
            char letter = (char) Integer.parseInt(charStr, 16); // 16进制parse整形字符串。
            buffer.append(new Character(letter).toString());
            start = end;
        }
        return buffer.toString();
    }

    public static void checkislogin(final LoginStateListener listener){
        AsyncHttpClient client = new AsyncHttpClient();
        client.get("http://www.baidu.com", null, new TextHttpResponseHandler() {
            @Override
            public void onFailure(int i, Header[] headers, String s, Throwable throwable) {
                listener.needLogin();
            }

            @Override
            public void onSuccess(int i, Header[] headers, String s) {
                if(s.contains("jlu.edu.cn")){
                    listener.needLogin();
                }else {
                    listener.isLogin();
                }
            }
        });
    }
    public interface LoginStateListener{
        public void isLogin();
        public void needLogin();
    }
}