android - 错误获取字符串到数组字符串和字符串到数组 int

Question

我试图通过按下应用程序按钮并在将整数转换为字符串时在编辑文本中写入类似 1 + 1 的内容，以便将它们放在其余的整数旁边，例如:11 而不是 1+1 (=2 )我在这行代码中收到错误“FATAL EXCEPTION”当按下任何数字按钮时

N[ii] = Integer.parseInt(stringNumber);

在按下 Sins x、+、- 按钮时，显示计算方法中也出现错误“致命异常”

private void insertOrCheckNumber() {
    if (End == 0) {
        ii++;
    } else if (u == 0) {
        N = new int[ii];
        stringNumber = stringNumber + String.valueOf(num);
        displayCalculations(stringNumber);
        N[ii] = Integer.parseInt(stringNumber);
    }
    if (u == 1) {
        Sins = new String[iii];
        displayCalculations(Sins[iii]);
    }

}
private void clickNumber(int cN) {
    u = 0;
    num = cN;
    insertOrCheckNumber();
}

private void displayCalculations(String txt) {
    Calcs = String.valueOf(showCalcs.getText());
    showCalcs.setText(Calcs + " " + txt);
}

Answer 1

在您的 Activity 中

私有(private)ListView ListView ；

onCreate

listView = (ListView) findViewById(R.id.listView);  
ArrayList<> finalN = new ArrayList<y>;
customAdapter = new listAdapter(this,R.layout.listview_example, finalN);
        listView.setAdapter(customAdapter);

public class listAdapter extends ArrayAdapter<>
        {
            public listAdapter(Context context, int resource, List<> objects) {
            super(context, resource, objects);
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
            Display display = wm.getDefaultDisplay();
            Point size = new Point();

            View v = convertView;
            if (v == null) {
                LayoutInflater vi;
                vi = LayoutInflater.from(getContext());
                v = vi.inflate(R.layout.listview_example, null);
            }
               //Setting the value to the textfields
            return v;
        }

如果您想要我的完整代码，请询问，我会发送给您 ;)