我想TextWatcher为多个EditText字段实现接口。目前我正在使用：
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，这工作正常，但我正在寻找其他方法，以便我可以明确识别当前关注EditText的领域。SoftKeyboard
@Sebastian Roth 的回答中建议的解决方案不是TextWatcherfor some的一个实例EditTexts。对于 n 来说，它是一个类和该类的 n 个实例EditTexts。
每个 EditText 都有自己的 Spannable。TextWatcher的事件有这个 Spannable 作为s参数。我检查他们的 hashCode （每个对象的唯一 ID）。myEditText1.getText() 返回 Spannable。所以如果myEditText1.getText().hashCode()等于s.hashCode()它就意味着s属于myEditText1
因此，如果您想拥有TextWatcherfor some的一个实例，EditTexts则应使用以下命令：
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);
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) {
}
}
我使用这个解决方案：
添加返回监听器的方法：
private TextWatcher getTextWatcher(final EditText editText) {
return new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
// do what you want with your EditText
editText.setText("blabla");
}
@Override
public void afterTextChanged(Editable editable) {
}
};
}
为多个EditText添加监听器，也可以传递其他参数：
editText1.addTextChangedListener(getTextWatcher(editText1));
editText2.addTextChangedListener(getTextWatcher(editText2));
editText3.addTextChangedListener(getTextWatcher(editText3));
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 （在我的情况下）：
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，您需要在哪里编写此代码：
myEditTextExtended.addTextChangedListener(this) //Let implement TextWatcherExtendedListener methods
4）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。
- 编辑 -
如果您只想使用 afterTextChanged 比较可编辑项：
@Override
public void afterTextChanged(Editable editable) {
if (editable == mEditText1.getEditableText()) {
// DO STH
} else if (editable == mEditText2.getEditableText()) {
// DO STH
}
}
另一种方法是添加OnClickListener并EditText设置一个全局变量，如下所示
EditText etCurrentEditor;//Global variable
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v instanceof EditText){
etCurrentEditor=(EditText)v;
}
}
将此 etCurrentEditor 用作对当前编辑的 EditText 的引用
@Override
public void afterTextChanged(Editable editable) {
// TODO Auto-generated method stub
switch (etCurrentEditor.getId()) {
case R.id.EDITTEXTID:
break;
default:
break;
}
}
我将其实现为：
edittext1.addTextChangedListener(this);
edittext2.addTextChangedListener(this);
edittext3.addTextChangedListener(this);
和：
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if(edittext1.hasFocus()){
//text changed for edittext1
}else if(edittext2.hasFocus()){
//text changed for edittext2
}else {
//text changed for edittext3
}
}
@Override
public void afterTextChanged(Editable editable) {
}
EditText.isFocused()在尝试了几种方法来实现这一点之后，我找到了区分彼此的正确方法。例如：
private class OnTextChangedListener implements TextWatcher {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
if (edtName.isFocused()) {
//do something
} else if (edtEmail.isFocused()) {
//do something
} else if (edtContent.isFocused()) {
//do something
}
}
}
是的，您可以使用自定义的多个实例TextWatcher来存储TextView. （TextView实际上是有的类addTextChangedListener。）
与上面的 hashCode 解决方案类似，您只需检查 if getText()==s。无需存储所有控件或findViewById多次存储，您可以简单地自己扫描内容树一次以查找具有CharSequence.
public TextView findTextView(View v, CharSequence s)
{
TextView tv;
ViewGroup vg;
int i, n;
if (v instanceof TextView)
{
tv = (TextView) v;
if (tv.getText()==s) return(tv);
}
else if (v instanceof ViewGroup)
{
vg = (ViewGroup) v;
n = vg.getChildCount();
for(i=0;i<n;i++)
{
tv = findTextView(vg.getChildAt(i), s);
if (tv!=null) return(tv);
}
}
return(null);
}
public void afterTextChanged(Editable s)
{
TextView tv=findTextView(findViewById(android.R.id.content), s);
if (tv==null) return;
switch(tv.getId())
{
case R.id.path:
break;
case R.id.title:
break;
}
}
当然你也可以使用findTextViewinsidebeforeTextChanged和onTextChanged.
所有活动的全球一堂课。
CustomTextWatcher.java
package org.logicbridge.freshclub.customizedItems;
import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
public class CustomTextWatcher implements TextWatcher {
private EditText mEditText;
Context context;
public CustomTextWatcher(EditText e, Context context) {
mEditText = e;
this.context = context;
}
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) {
}
}
您可以这样做以获取编辑文本的 id。它未经测试，但让我知道它是否有效。
//setting textWatcher for the editText
textWatcher(owner_name);
public void textWatcher(final EditText editText){
TextWatcher watcher = new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(editText.getId()==R.id.your_id){
//Do something
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
if(editText.getId()==R.id.your_id){
//Do something
}
}
@Override
public void afterTextChanged(Editable s) { }
};
editText.addTextChangedListener(watcher);
}
您始终可以将其定义TextWatcher为addTextChangedListener方法的参数。这样您可以为每个编辑文本有多个定义。
只需使用hashCode()方法比较编辑文本和字符串的哈希码
@Override
public void afterTextChanged(Editable s) {
if (editext.getText().hashCode() == s.hashCode()){
type1Total(type1List);
}
}
这就是我所做的......
private TextWatcher textWatcher = 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) {
if (editText1.getText().length() > 0
&& editText2.getText().length() > 0
&& editText3.getText().length() > 0) {
button.setEnabled(true);
} else {
button.setEnabled(false);
}
}
@Override
public void afterTextChanged(Editable s) {
}
然后只需将 TextWatcher 添加到 onCreate 方法中的每个 EditText 并在此处默认保留按钮 setEnabled(false) 。
button.setEnabled(false);
editText1.addTextChangedListener(textWatcher);
editText2.addTextChangedListener(textWatcher);
editText3.addTextChangedListener(textWatcher);
如果您使用的是 Kotlin，扩展功能将完成这项工作。例如，我们需要将 TextWatcher 添加到editText1和editText2
像这样创建一个扩展函数，
fun EditText.addTextWatcher() {
this.addTextChangedListener(
object : TextWatcher {
override fun afterTextChanged(s: Editable?) {
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
// you do some common operations here
when (this@addTextWatcher) {
editText1 -> {
// do something for editText1
}
editText2 -> {
// do something for editText2
}
}
}
}
)
}
然后像这样将 textwatcher 添加到 EditTexts
editText1.addTextWatcher()
editText2.addTextWatcher()
我已经做了这样的事情，只有一个TextWatcher班级可以控制EditText来自ActivityOR的尽可能多的班级Fragment
您需要首先创建一个MultiTextWatcher类，如下所示
class MultiTextWatcher {
private var callback: TextWatcherWithInstance? = null
fun setCallback(callback: TextWatcherWithInstance): MultiTextWatcher {
this.callback = callback
return this
}
fun registerEditText(editText: EditText): MultiTextWatcher {
editText.addTextChangedListener(object : TextWatcher {
override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {
callback!!.beforeTextChanged(editText, s, start, count, after)
}
override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
callback!!.onTextChanged(editText, s, start, before, count)
}
override fun afterTextChanged(editable: Editable) {
callback!!.afterTextChanged(editText, editable)
}
})
return this
}
interface TextWatcherWithInstance {
fun beforeTextChanged(editText: EditText, s: CharSequence, start: Int, count: Int, after: Int)
fun onTextChanged(editText: EditText, s: CharSequence, start: Int, before: Int, count: Int)
fun afterTextChanged(editText: EditText, editable: Editable)
}
}
然后在你的ActivityorFragment中，你需要像下面那样注册尽可能多EditText的，而且我已经使用数据绑定来获取XML视图的引用，你可以使用你的方式。
private fun setTextWatchers() {
MultiTextWatcher()
.registerEditText(binding.etCompanyAddress)
.registerEditText(binding.etCompanyIntro)
.registerEditText(binding.etCompanyName)
.registerEditText(binding.etCompanyPhone)
.setCallback(object : MultiTextWatcher.TextWatcherWithInstance {
override fun beforeTextChanged(editText: EditText, s: CharSequence, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(editText: EditText, s: CharSequence, start: Int, before: Int, count: Int) {
when (editText) {
binding.etCompanyAddress -> {
//do your logic here
}
binding.etCompanyPhone -> {
//do your logic here and so on
}
}
}
override fun afterTextChanged(editText: EditText, editable: Editable) {
}
})
}