安卓自定义字符串格式

Question

我的应用程序中有一个EditText和TextView，我想在EditText输入数字时，这个数字以自定义格式显示，但不是。

private int billAmount = 0;  
private TextView amountTextView;
amountTextView = (TextView) findViewById(R.id.amountTextView);
amountEditText = (EditText) findViewById(R.id.amountEditText);
amountEditText.addTextChangedListener(amountEditTextWatcher);

private final TextWatcher amountEditTextWatcher=new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, 
                                           int i, int i1, int i2) {
        }
        @Override
        public void onTextChanged(CharSequence charSequence, 
                                           int i, int i1, int i2) {
            try {
                DecimalFormat df=new DecimalFormat("###,###,###,###");
                df.format(billAmount);
                amountTextView.setText(amountEditText.getText().toString());
                billAmount=Integer.parseInt(amountEditText.getText().toString());
            }catch (NumberFormatException e){
                amountTextView.setText("");
                billAmount=0;
            }

Answer 1

这有效

        try {
                DecimalFormat df=new DecimalFormat("###,###,###,###");
                amountTextView.setText(df.format(Integer.parseInt(amountEditText.getText().toString())));
            } catch (NumberFormatException e){
                amountTextView.setText("");
                billAmount=0;
            }