Android判断输入是否只包含数字并且执行跳转功能

更新，想要限制输入类型只需要在xml文件里设置android:inputType=“number”(“decimal”)用以达到限制的目的

private class JumpNextClass implements TextWatcher {    private EditText thisView;    private View nextView;    public String str_before;    public JumpNextClass(EditText vThis, View vNext) {        super();        thisView = vThis;        nextView = vNext;    }    @Override //保存输入新字符前的text,如输入错误可更改    public void beforeTextChanged(CharSequence s, int start, int count, int after) {        str_before = s.toString();    }    //判断是否是数字，如果不是则改为原来的text    public void onTextChanged(CharSequence s, int start, int before, int count) {        String str = s.toString();        if (str.contains("\r") || str.contains("\n") || str.contains(" "))        {            thisView.setText(str_before);            thisView.setSelection(start);        }        try {            if ( str.length() == 0 || str == null ) return;            if(str.charAt(str.length()-1) == 'f' || str.charAt(str.length()-1) == 'd'                    || str.charAt(str.length()-1) == 'D' || str.charAt(str.length()-1) == 'F')            {                thisView.setText(str_before);                thisView.setSelection(start);                str = str.substring(0,str.length()-1);            }            double temp = Double.valueOf(str);        } catch ( Exception e ) {            thisView.setText(str_before);            thisView.setSelection(start); //使光标位置不变，不然setText()会让光标移到text最前            Toast.makeText(MainActivity.this, "You should input num.", Toast.LENGTH_SHORT).show();        }    }    public void afterTextChanged(Editable s) {        if (s.toString().contains("\r") || s.toString().contains("\n")) //如果输入了换行符那么跳转        {            if (nextView != null && nextView instanceof EditText) {                nextView.requestFocus();                EditText temp = (EditText)nextView;                temp.setSelection(temp.getText().length());            } else if ( nextView instanceof Button )            {                Button temp = (Button)nextView;                temp.setFocusable(true);                temp.setFocusableInTouchMode(true);                temp.requestFocus();            }        }    }}

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