Question

当edittext为null并按下添加按钮时，我的代码崩溃...我尝试将整数从edittext复制到数组...我怎么能修复它这个错误？我设置了edittext
机器人：的inputType = “numberDecimal”

我可以试试看吗？抓住？

  public static ArrayList<Integer> pulseslist = new ArrayList<Integer>();

public int pulses1[]=null;

  private OnClickListener btnAddListener = new OnClickListener() {

        public void onClick(View v) {

            String ag=editIRpulse1.getText().toString().trim();
            if (ag!=null){
            int intag= Integer.parseInt(ag);
            if(ag.length() > 0){
                   pulseslist.add(intag); 
                   editIRpulse1.setText(""); // adds text to arraylist and make edittext blank again

            }   

            pulses1 = new int[pulseslist.size()];
            for (int i = 0; i < pulseslist.size(); i++) {
                pulses1[i] = pulseslist.get(i);
            }

            }
        }

    };

Answer 1

更改此

android:inputType="numberDecimal"

到

android:inputType="number"

因为您只想要int s。您还应该使用try/catch来捕获NumberFormatException以防止空Strings或无效的数字。如果你遇到异常，就什么都不做。您应该向用户显示一条消息，表明他们已经使用了无效字符

Answer 2

试试这个

public static ArrayList<Integer> pulseslist = new ArrayList<Integer>();

public int pulses1[]=null;

  private OnClickListener btnAddListener = new OnClickListener() {

        public void onClick(View v) {

            String ag=editIRpulse1.getText().toString();
            if (ag!=null){
            ag.trim(); //Maybe crash for this method put here........................
            int intag= Integer.parseInt(ag);
            if(ag.length() > 0){
                   pulseslist.add(intag); 
                   editIRpulse1.setText(""); // adds text to arraylist and make edittext blank again

            }   

            pulses1 = new int[pulseslist.size()];
            for (int i = 0; i < pulseslist.size(); i++) {
                pulses1[i] = pulseslist.get(i);
            }

            }
        }

    };

从EditText获取null字符串时出现错误ArrayList

2 个答案: