android开发常用工具类 文件读写 手机号格式校验 有无网络判断

1.手机号格式校验

 /**
     * 判断是否是正确的手机号码
     *
     * @param phone
     * @return
     */
    public static boolean isRightMobilePhoe(String phone) {
        if(phone == null){
            return false;
        }
        String head1 = "";
        String head2 = "";

        // 去除前后的空白
        phone = phone.trim();

        // 判断输入的电话号码是否合法
        if (phone.length() < 11) {
            return false;
        } else {
            // 处理国内的+86开头
            if (phone.startsWith("+")) {
                phone = phone.substring(1);
            }
            if (phone.startsWith("86")) {
                phone = phone.substring(2);
            }
        }
        // 去除+86后电话号码应为11位
        if (phone.length() != 11) {

            return false;
        }
        // 判断去除+86后剩余的是否全为数字
        if (!isNum(phone)) {
            System.out.println(" not num");
            return false;
        }
        // 截取前3或前4位电话号码，判断运营商
        head1 = phone.substring(0, 3);
        head2 = phone.substring(0, 4);

        // 移动前三位
        boolean cmcctemp3 = head1.equals("135") || head1.equals("136")
                || head1.equals("137") || head1.equals("138")
                || head1.equals("139") || head1.equals("147")
                || head1.equals("150") || head1.equals("151")
                || head1.equals("152") || head1.equals("157")
                || head1.equals("158") || head1.equals("159")
                || head1.equals("182") || head1.equals("187")
                || head1.equals("188");

        if (cmcctemp3) {
            return true;
        }
        // 移动前4位
        boolean cmcctemp4 = head2.equals("1340") || head2.equals("1341")
                || head2.equals("1342") || head2.equals("1343")
                || head2.equals("1344") || head2.equals("1345")
                || head2.equals("1346") || head2.equals("1347")
                || head2.equals("1348");

        if (cmcctemp4) {
            return true;
        }
        // 联通前3位
        boolean unicomtemp = head1.equals("130") || head1.equals("131")
                || head1.equals("132") || head1.equals("145")
                || head1.equals("155") || head1.equals("156")
                || head1.equals("185") || head1.equals("186");

        if (unicomtemp) {
            return true;
        }
        // 电信前3位
        boolean telecomtemp = head1.equals("133") || head1.equals("153")
                || head1.equals("180") || head1.equals("189") || head1.equals("181");

        if (telecomtemp) {
            return true;
        }
        //虚拟运营商
        boolean virtualtemp = head1.equals("170");

        if (virtualtemp) {
            return true;
        }

        return false;
    }

2.写入字符串到文件 读取文件

 public static void writeLogToSdcard(Context  context,String log) {
        String TAG="Tools.writeLogToSdcard";
        File file;
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
            file=new File(Environment.getExternalStorageDirectory(),"dyLog.txt");
        }else{
            file=new File(context.getFilesDir(),"dyLog.txt");
        }
        try {
            FileOutputStream fo= new FileOutputStream(file);
            byte[] bytes = log.getBytes();
            fo.write(bytes);
            fo.close();
        }catch (Exception e) {
            e.printStackTrace();
            Log.e(TAG, "writeLogToSdcard "+e.getMessage());
        }
    }

    public  static String  readLogFromFile(Context  context){
        String TAG="Tools.readLogFromFile";
        String  res="";
        String  filename;
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
            filename=Environment.getExternalStorageDirectory()+"/dyLog.txt";
        }else{
            filename=context.getFilesDir()+"/dyLog.txt";
        }
        try{
            FileInputStream fin = new FileInputStream(filename);
            int length = fin.available();
            byte [] buffer = new byte[length];
            fin.read(buffer);
            res = EncodingUtils.getString(buffer, "UTF-8");
            fin.close();
        }catch(Exception e){
            e.printStackTrace();
            Log.e(TAG, "read log  file  error "+e.getMessage());
        }
        Log.i(TAG, "read log  file result "+res);
        return res;
    }

3.判断有无网络

  /**
     * @return true 有网络，false 无
     */
    public static boolean hasInternet(Context context) {
        ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = manager.getActiveNetworkInfo();
        if (info == null || !info.isConnected()) {
            return false;
        }
        if (info.isRoaming()) {
            return true;
        }
        return true;
    }