EditText中控制输入的字符长度

 mEditText.addTextChangedListener(new TextWatcher() {

            private CharSequence temp;
            private int editStart;
            private int editEnd;
            private boolean isFrist = true;

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                temp = s;
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }

            @Override
            public void afterTextChanged(Editable s) {
                editStart = edChangeData.getSelectionStart();
                editEnd = edChangeData.getSelectionEnd();
                if (temp.length() > 10) {
                    if (isFrist) {
                        Toast.makeText(activity,
                                "你输入的字数已经超过了限制！", Toast.LENGTH_SHORT)
                                .show();
                        isFrist = false;
                    }
                    s.delete(editStart - 1, editEnd);
                    int tempSelection = editStart;
                    edChangeData.setText(s);
                    edChangeData.setSelection(tempSelection);
                }

            }
        });