android IP输入框

本文提供一种IP输入框的实现方法，会过滤非IP字符的输入，同时过滤非法IP的输入，同时提供确定和取消事件的处理接口。具体实现如下：

[java]
        private static String tmp = "";

        // IP 输入框
    public static void showIPInputDialog(final Context context, final String title, final String initIp, final onIPInputDialogProcess listener){
        tmp = "";
        final EditText ip = new EditText(context);
        ip.setText(initIp);
        ip.setInputType( InputType.TYPE_CLASS_NUMBER | InputType.TYPE_CLASS_TEXT );
        ip.addTextChangedListener(new TextWatcher(){

            public void afterTextChanged(Editable s) {
                String str = s.toString();
                if( str.length() == 0 || str.equals(tmp)) return;
                tmp = checkIp(str);
                ip.setText(tmp);
                ip.setSelection(tmp.length());
            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }});

        new AlertDialog.Builder(context)
        .setTitle(title)
        .setView(ip)
        .setPositiveButton(R.string.dialog_bt_ok, new OnClickListener(){
            public void onClick(DialogInte易做图ce dialog, int which) {
                String ipText = ip.getText().toString();
                if( ipText.split("\\.").length == 4 ){
                    if( listener != null ) listener.onIPInputConfirm(ip.getText().toString());
                }else{
                    showIPInputDialog(context, title, ipText, listener);
                }
            }})
        .setNegativeButton(R.string.dialog_bt_cancel, new OnClickListener(){
            public void onClick(DialogInte易做图ce dialog, int which) {
                if( listener != null ) listener.onIPInputCancel();
            }})
        .show();
    }

    private static String checkIp(String ip){
        String validStr = ".0123456789";
        StringBuffer sb = new StringBuffer();
        int i = 0;

        for( i = 0; i < ip.length(); i++){
            if( validStr.indexOf(ip.charAt(i)) >= 0 ) sb.append(ip.charAt(i));
        }
        if( sb.toString().length() == 0 ) return "";

        String newIP = "";
        String[] arrIp = sb.toString().split("\\.");
        for( i = 0; i < arrIp.length && i < 4 ; i++){
            if( arrIp.equals("")) break;
            if( i > 0 && i < 4 ) newIP += ".";
            if( Integer.parseInt(arrIp[i]) > 255 ){
                newIP += String.format("%d", Integer.parseInt(arrIp[i])/10);
            }else{
                newIP += arrIp[i];
            }
        }
        if( i < 4 && sb.toString().endsWith("-")) newIP += ".";
        return newIP;
    }

    inte易做图ce onIPInputDialogProcess{
        void onIPInputConfirm(String ip);
        void onIPInputCancel();
    }

补充：移动开发 , Android ,