android TextWatcher

searchEdit.addTextChangedListener(searchWatcher);//调用TextWatcher的方法private TextWatcher searchWatcher = new TextWatcher() {//TextWatcher观察输入框中输入的内容//在向输入框中输入之后public void afterTextChanged(Editable arg0) {//arg0为输入框中的所有文字System.out.println("--------00-------" + arg0);}public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) {System.out.println("charsequence----" + s + "--start---==" + start + "--count====" + count + "--after*****" + after);                        // s:之前的文字内容   start:添加文字的位置   count:一直是0  after:此次添加的文字总数(并不是输入框中的文字的总数)                }public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {Log.d("TAG", "[TextWatcher][onTextChanged]" + s);System.out.println("onTextChanged" + "charsequence----" + s + "--start---==" + start + "--count====" + count);                        //s:文本框中输入的所有文字  start:添加文字的位置 before:一直是0 count:此次添加文字的总个数                }}；

TextWatcher可以对EditText中输入的内容进行限制

摘自： http://www.cnblogs.com/cat-fang/archive/2011/04/12/2013428.htmlTextWatcher mTextWatcher = new TextWatcher() {        private CharSequence temp;        private int editStart ;        private int editEnd ;        @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) {            mTextView.setText(s);        }               @Override        public void afterTextChanged(Editable s) {            editStart = mEditText.getSelectionStart();            editEnd = mEditText.getSelectionEnd();            if (temp.length() > 10) {                Toast.makeText(TextWatcherDemo.this,                        "你输入的字数已经超过了限制！", Toast.LENGTH_SHORT)                        .show();                s.delete(editStart-1, editEnd);                int tempSelection = editStart;                mEditText.setText(s);                mEditText.setSelection(tempSelection);            }        }    };

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