EditText的实时监听

// 搜索框的文本变化实时监听  
et_search.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {

}

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

}

@Override
public void afterTextChanged(Editable s) {
if (s.toString().trim().length() == 0) {
// tv_tip.setText("历史");
} else {
// tv_tip.setText("结果");
}
}
});