textwatcheredittext监听是否有内容

textwatcher 时间:2021-07-20 阅读:()

android edittext用textwatcher监听，当手机输入小写字母时自动转为大写，求详细代码

public class MainActivity extends Activity { EditText et ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et = (EditText) this.findViewById(R.id.editText1); et.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { et.removeTextChangedListener(this); final String s1 = et.getText().toString(); //判断如果是小写的字母的换，就转换 if((s1.charAt(0))-0 >= 97 && (s1.charAt(0))-0 <=122){ new Handler().postDelayed(new Runnable() { @Override public void run() { //小写转大写 et.setText(s1.toUpperCase()); } }, 300); } } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void afterTextChanged(Editable s) { } }); } }

android中两个输入框，如何获取这两个值的乘积赋值给textview，就如web中onkeyup事件，自动获取。

使用TextWatcher类来监视改动.

privateTextWatcherwatcher=newTextWatcher(){
@Override
publicvoidafterTextChanged(Editables){
//TODOAuto-generatedmethodstub
}
@Override
publicvoidbeforeTextChanged(CharSequences,intstart,intcount,
intafter){
//TODOAuto-generatedmethodstub
}
@Override
publicvoidonTextChanged(CharSequences,intstart,intbefore,
intcount){
Log.d("TAG","[TextWatcher][onTextChanged]"+s);
}
};

使用时

EditTextet=(EditText)findViewById(R.id.edit);
et.addTextChangedListener(watcher);

edittext监听是否有内容

监听EditText内容变化 1、给EditText追加ChangedListener EditText editText = (EditText) findViewById(R.id.edittext); editText.addTextChangedListener(watcher); 2、描述监听 private TextWatcher watcher = new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub } @Override public void afterTextChanged(Editable s) { // TODO Auto-generated method stub } };