textwatcher如何让一个EditText只可以输入英文？

一个EditText注册了个textwatcher监听对象。。重写了三个方法。。我想知道这个监听对象什么时候触发,

一个EditText注册了个textwatcher监听对象。

。

重写了三个方法。

。

当输入的时候会触发的，还有就是改变输入的内容的时候也会。

android 怎样使输入框的内容不显示

1. 设置字体特小android:textSize="0sp" 2. 监听输入TextWatcher 每输入一个字符用成员变量接收 然后清空EditText 3. android:textColor="#00000000"

textwatcher能抽成一个方法吗

你就别设置inputtype了，在代码码里用 TextView.setFilters(InputFilter[]);方法设置InputFilter，自己过虑掉不想要的字符，并做提示。

怎么对多个EditText是用一个Textwatcher

前提是你可以监测到用户正在做这件事情(监听用edittext.addTextChangedListener(textWatcher);) 然后弹出对话框提醒他 toast也可以 效果不明显 如果你认可我的回答，敬请及时采纳， ~如果你认可我的回答，请及时点击【采纳为满意回答】按钮 ~~手机提问的朋友在客户端右上角评价点【满意】即可。

~你的采纳是我前进的动力 ~~O(∩_∩)O，记得好评和采纳，互相帮助。

如何限制edittext输入字数 3种方法的

Android EditText 字符个数限制 方法一： ?mEditText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(Constants.MAX_TEXT_INPUT_LENGTH)}); ? 方法二： ?private TextWatcher mTextWatcher = new TextWatcher(){ ??Toast mToast = null; ??public void beforeTextChanged(CharSequence s, int start,? ????int count,int after) { ??} ??public void onTextChanged(CharSequence s, int start,? ????int before,int count) { ??} ??public void afterTextChanged(Editable s) { ???int nSelStart = 0; ???int nSelEnd = 0; ???boolean nOverMaxLength = false; ???nSelStart = mEditText.getSelectionStart(); ???nSelEnd?? = mEditText.getSelectionEnd(); ???nOverMaxLength = (s.length() > Constants.MAX_TEXT_INPUT_LENGTH) ? true : false; ???if(nOverMaxLength){ ????if(null == mToast){ ?????mToast = Toast.makeText(mContext,? ???????R.string.IDS_MSG_TEXT_OVER_MAXLENGTH,? ???????Toast.LENGTH_SHORT); ????} ????mToast.show(); ????s.delete(nSelStart - 1, nSelEnd); ????mEditText.setTextKeepState(s);//请读者注意这一行，保持光标原先的位置，而 mEditText.setText(s)会让光标跑到最前面， ???????????????????????????????????????????????????? //就算是再加mEditText.setSelection(nSelStart)?也不起作用 ????} ??} ?}; android editText 输入字数限制 方法一： ???????? // 输入框限制输入字数 ?? ???? editText.addTextChangedListener(new TextWatcher() { ?? ???? ??? private CharSequence temp; ?? ???? ??? private boolean isEdit = true; ?? ???? ??? private int selectionStart ; ?? ???????? private int selectionEnd ; ?? ???????? @Override ?? ???????? public void beforeTextChanged(CharSequence s, int arg1, int arg2, ?? ???????? ??? ??? int arg3) { ?? ???????? ??? temp = s; ?? ???????? } ?? ???????? @Override ?? ???????? public void onTextChanged(CharSequence s, int arg1, int arg2, ?? ???????? ??? ??? int arg3) { ?? ???????? } ?? ???? ??? @Override ?? ???? ??? public void afterTextChanged(Editable s) { ?? ???? ??? ???? selectionStart = editText.getSelectionStart(); ?? ???????? ??? selectionEnd = editText.getSelectionEnd(); ?? ???????? ??? Log.i("gongbiao1",""+selectionStart); ?? ???? ??? ??? if (temp.length() > Constant.TEXT_MAX) { ?? ???? ??? ??? ??? Toast.makeText(KaguHomeActivity.this, ?? ???????? ??? ??? ??? ??? R.string.edit_content_limit, Toast.LENGTH_SHORT) ?? ???????? ??? ??? ??? ??? .show(); ?? ???? ??? ??? ??? s.delete(selectionStart-1, selectionEnd); ?? ???? ??? ??? ??? int tempSelection = selectionStart; ?? ???? ??? ??? ??? editText.setText(s); ?? ???? ??? ??? ??? editText.setSelection(tempSelection); ?? ???? ??? ??? } ?? ???? ??? } ?? ???? }); ????? 方法二： ???????? 利用EditText可以设置filter的特性，自定义一个LengthFilter，当输入字数超过限制时 ，做出自定义的提示 ????????? // 输入框限制输入字数 ??? ??? InputFilter[] filters = new InputFilter[1]; ??? ??? filters[0] = new InputFilter.LengthFilter(Constant.TEXT_MAX) { ??? ??? ??? @Override ??? ??? ??? public CharSequence filter(CharSequence source, int start, int end, ??? ??? ??? ??? ??? Spanned dest, int dstart, int dend) { ??? ??? ??? ??? if (source.length() > 0 && dest.length() == Constant.TEXT_MAX) { ??? ??? ??? ??? ??? if ((System.currentTimeMillis() - toastTime) > interval) { ??? ??? ??? ??? ??? ??? toastTime = System.currentTimeMillis(); ??? ??? ??? ??? ??? ??? Toast ??? ??? ??? ??? ??? ??? ??? ??? .makeText(KaguHomeActivity.this, ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? R.string.edit_content_limit, ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? Toast.LENGTH_SHORT).show(); ??? ??? ??? ??? ??? } ??? ??? ??? ??? } ??? ??? ??? ??? if (dest.toString().equals( ??? ??? ??? ??? ??? ??? getResources().getString(R.string.input_default_txt))) { ??? ??? ??? ??? ??? Bundle data = new Bundle(); ??? ??? ??? ??? ??? data.putCharSequence("source", source); ??? ??? ??? ??? ??? Message message = textHandler.obtainMessage(); ??? ??? ??? ??? ??? message.setData(data); ??? ??? ??? ??? ??? message.sendToTarget(); ??? ??? ??? ??? } ??? ??? ??? ??? return super.filter(source, start, end, dest, dstart, dend); ??? ??? ??? } ??? ??? }; ??? ??? editText.setFilters(filters); private Handler textHandler = new Handler() { ??? ??? @Override ??? ??? public void handleMessage(Message msg) { ??? ??? ??? Bundle data = msg.getData(); ??? ??? ??? CharSequence source = data.getCharSequence("source"); ??? ??? ??? editText.setTextColor(Color.BLACK); ??? ??? ??? editText.setText(source); ??? ??? ??? editText.setSelection(source.length()); ??? ??? } ??? };

如何让一个EditText只可以输入英文？

试试android:inputType="number|text"另外：EditText is derived from TextView which has avoid addTextChangedListener(TextWatcher watcher)method. TextWatcher has callbacks, likeabstract void afterTextChanged(Editable s)