TextWatcher是一個文本框的監聽器,直接舉一個例子,從我工程的代碼中複製的,是一個在編輯框輸入內容的時候(內容是可以變化的),下面的文本框顯示從數據庫中查到的內容。
public class AddressActivity extends Activity {private EditText etNumber;
private TextView tvResult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_address);
etNumber=(EditText)findViewById(R.id.et_number);
tvResult=(TextView)findViewById(R.id.tv_result);
//此處調用了了文本框監聽器
etNumber.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
String address = AddresDao.getAddress(s.toString());
tvResult.setText(address);
}
// 文本框變化前
@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
//在文本框變化之後
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
String address = AddresDao.getAddress(s.toString());
tvResult.setText(address);
}
});
}
}