Android实现限制EditText输入文字的数量

原文 http://blog.csdn.net/studynote/article/details/37928399
一： 声明控件。

TextView hasnumTV;

TextView hasnum;// 用来显示剩余字数

int num = 50;// 限制的最大字数

二： 主要的方法：

hasnumTV = (TextView) findViewById(R.id.tv_num);

hasnumTV.setText("限" + num + "" + "字以内");

editText.addTextChangedListener(new TextWatcher() {

private CharSequence temp;

private int selectionStart;

private int selectionEnd;

@Override

public void onTextChanged(CharSequence s, int start, int before,

int count) {

}

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

temp = s;

}

public void afterTextChanged(Editable s) {

// TODO Auto-generated method stub

int number = num - s.length();

hasnumTV.setText("剩余" + "" + number + "个字");

selectionStart = editText.getSelectionStart();

selectionEnd = editText.getSelectionEnd();

if (temp.length() > num) {

s.delete(selectionStart - 1, selectionEnd);

int tempSelection = selectionEnd;

editText.setText(s);

editText.setSelection(tempSelection);// 设置光标在最后

}

}

});

主要的效果是做到了输入的限制文字