android 限制 EditText 最大输入字符数并显示已经输入字符数

int MAX_LENGTH = 500;                   //最大输入字符数100

int Rest_Length = MAX_LENGTH;

numTv.setText("0/500");

editRemarkDescription.setFilters(new InputFilter[]{new InputFilter.LengthFilter(MAX_LENGTH)});//设置最大可输入字符数
editRemarkDescription.addTextChangedListener(new TextWatcher() {//设置EditText输入监听
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Rest_Length = MAX_LENGTH - editRemarkDescription.getText().length();
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
Rest_Length = MAX_LENGTH - editRemarkDescription.getText().length();
}
@Override
public void afterTextChanged(Editable s) {
Rest_Length = MAX_LENGTH - editRemarkDescription.getText().length();
numTv.setText(editRemarkDescription.getText().length()+"/500");
if (Rest_Length<=0) {
ToastUtil.showToast(context, "输入内容不能超过500字哦");
}
}
});