多个EditText的TextWatcher
多个EditText的TextWatcher
提问于 2010-11-26 14:43:08
我想为多个EditText字段实现TextWatcher接口。目前我使用的是：
text1.addTextChangedListener(this);
text2.addTextChangedListener(this);然后覆盖我的活动中的方法：
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count)
{
// do some operation on text of text1 field
// do some operation on text of text2 field
}然而，这工作得很好，但我正在寻找其他方法，这样我就可以显式地确定SoftKeyboard当前关注的是哪个EditText字段。
回答 12
Stack Overflow用户
回答已采纳
发布于 2012-12-09 20:04:29
在@Sebastian Roth's answer中建议的解决方案不是某个EditTexts的一个TextWatcher实例。对于n个EditTexts，它是一个类和该类的n个实例。
每个EditText都有自己的Spannable。TextWatcher的事件将此Spannable作为s参数。我检查它们的hashCode (每个对象的唯一Id )。myEditText1.getText()返回该Spannable。因此，如果myEditText1.getText().hashCode()等于s.hashCode()，则意味着s属于myEditText1
因此，如果你想让某个EditTexts有一个TextWatcher实例，你应该使用下面的代码：
private TextWatcher generalTextWatcher = new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if (myEditText1.getText().hashCode() == s.hashCode())
{
myEditText1_onTextChanged(s, start, before, count);
}
else if (myEditText2.getText().hashCode() == s.hashCode())
{
myEditText2_onTextChanged(s, start, before, count);
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
if (myEditText1.getText().hashCode() == s.hashCode())
{
myEditText1_beforeTextChanged(s, start, count, after);
}
else if (myEditText2.getText().hashCode() == s.hashCode())
{
myEditText2_beforeTextChanged(s, start, count, after);
}
}
@Override
public void afterTextChanged(Editable s) {
if (myEditText1.getText().hashCode() == s.hashCode())
{
myEditText1_afterTextChanged(s);
}
else if (myEditText2.getText().hashCode() == s.hashCode())
{
myEditText2_afterTextChanged(s);
}
}
};和
myEditText1.addTextChangedListener(generalTextWatcher);
myEditText2.addTextChangedListener(generalTextWatcher);Stack Overflow用户
发布于 2010-11-26 16:15:38
我会这样做：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
EditText e = new EditText(this);
e.addTextChangedListener(new CustomTextWatcher(e));
}
private class CustomTextWatcher implements TextWatcher {
private EditText mEditText;
public CustomTextWatcher(EditText e) {
mEditText = e;
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void afterTextChanged(Editable s) {
}
}Stack Overflow用户
发布于 2013-12-24 23:29:41
使用"CustomTextWatcher“的想法，我做到了
1)创建了一个新的TextWatcherListener接口：
public interface TextWatcherExtendedListener extends NoCopySpan
{
public void afterTextChanged(View v, Editable s);
public void onTextChanged(View v, CharSequence s, int start, int before, int count);
public void beforeTextChanged(View v, CharSequence s, int start, int count, int after);
}2)创建并使用EditTextExtended而不是EditText (在我的例子中)：
public class EditTextExtended extends EditText
{
private TextWatcherExtendedListener mListeners = null;
public EditTextExtended(Context context)
{
super(context);
}
public EditTextExtended(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public EditTextExtended(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public void addTextChangedListener(TextWatcherExtendedListener watcher)
{
if (mListeners == null)
{
mListeners = watcher;
}
}
public void removeTextChangedListener(TextWatcherExtendedListener watcher)
{
if (mListeners != null)
{
mListeners = null;
}
}
void sendBeforeTextChanged(CharSequence text, int start, int before, int after)
{
if (mListeners != null)
{
mListeners.beforeTextChanged(this, text, start, before, after);
}
}
void sendOnTextChanged(CharSequence text, int start, int before,int after)
{
if (mListeners != null)
{
mListeners.onTextChanged(this, text, start, before, after);
}
}
void sendAfterTextChanged(Editable text)
{
if (mListeners != null)
{
mListeners.afterTextChanged(this, text);
}
}
}3)因此，您需要编写以下代码：
myEditTextExtended.addTextChangedListener(this) //Let implement TextWatcherExtendedListener methods4)使用它们：
@Override
public void onTextChanged(View v, CharSequence s, int start, int before, int count)
{
//Tested and works
//do your stuff
}
@Override
public void beforeTextChanged(View v, CharSequence s, int start, int count, int after)
{
//not yet tested but it should work
}
@Override
public void afterTextChanged(View v, Editable s)
{
//not yet tested but it should work
}好吧，让我知道你的想法。
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原文链接：
https://stackoverflow.com/questions/4283062
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