Android判断输入是否只包含数字并且执行跳转功能

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(); } } } }