我的应用程序的一项功能允许用户通过输入 Edittext 来更新他们的练习元素。在后台，我使用 aTextWatcher来监听更改并将每个更改保存到 UI 打开时填充的 mutableList。它适用于超过 1 个元素的 mutableList。但是当只有一个元素时它会返回错误。
我如何使用 MutableList 有问题吗？
我在这里将数据输入到数组列表中
dialogViewModel.clickedExercise(this, exerciseID) {repList = it.numberOfReps.split(", ") as MutableList<String> ...}
然后我为每个元素创建一个 Edittext。
editTextReps.apply {
setText(reps)
//textAlignment = View.TEXT_ALIGNMENT_CENTER
textSize = 20f
id = repInt
setBackgroundColor(WHITE)
setPadding(0, 0, 16, 0)
layoutParams = ViewGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT
)...}
然后我听每个 EditText 的变化
editTextReps.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(p0: Editable?) {
exercise.numberOfReps = repString.toString()
if (repTrial == repString.toString())
Log.d(TAG, "Nothing Change")
else
Log.d(TAG, "It changed")
dialogViewModel.update(exercise)
Log.d(TAG, repString.toString())
repString.clear()
}
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(
exerciseString: CharSequence?,
p1: Int,
p2: Int,
p3: Int
) {
//repList[listPosition]
//TODO: Position probably not right, error occurs when attempt is made to modify single set
Log.d(TAG, "${repList.size} , ${repList[listPosition]},\n$repTrial")
val testString = exerciseString.toString()
Log.d(TAG, "test: $testString")
this is the issue -> -> -> ->repList[listPosition] = testString
Log.d(TAG, "List Position: $listPosition, ${repList[listPosition]}")
for (rep in repList) {
repString.append("$rep, ")
Log.d(TAG, "${repList.size}")
}
}
})
此代码适用于多个项目，但当 MutableList 仅包含一项时它会崩溃
错误读数
E/InputEventReceiver: Exception dispatching input event.
E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
E/MessageQueue-JNI: java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at com.homeofficeprojects.countmyreps.DialogUpdateExercise$onCreate$1$5.onTextChanged(DialogUpdateExercise.kt:195)
at android.widget.TextView.sendOnTextChanged(TextView.java:9754)
at android.widget.TextView.handleTextChanged(TextView.java:9851)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:12509)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1263)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:575)
at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:229)
at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:36)
at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:370)
at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:71)
at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:479)
at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:362)
at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:141)
at android.widget.TextView.doKeyDown(TextView.java:7665)
at android.widget.TextView.onKeyDown(TextView.java:7442)
at android.view.KeyEvent.dispatch(KeyEvent.java:2692)
at android.view.View.dispatchKeyEvent(View.java:12450)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.widget.ScrollView.dispatchKeyEvent(ScrollView.java:389)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:428)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1820)
at android.app.Dialog.dispatchKeyEvent(Dialog.java:811)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:342)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5037)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4905)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4585)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4642)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4585)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4642)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$InputStage.
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.homeofficeprojects.countmyreps, PID: 10507
java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at com.homeofficeprojects.countmyreps.DialogUpdateExercise$onCreate$1$5.onTextChanged(DialogUpdateExercise.kt:195)
at android.widget.TextView.sendOnTextChanged(TextView.java:9754)
at android.widget.TextView.handleTextChanged(TextView.java:9851)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:12509)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1263)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:575)
at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:229)
at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:36)
at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:370)
at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:71)
at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:479)
at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:362)
at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:141)
at android.widget.TextView.doKeyDown(TextView.java:7665)
at android.widget.TextView.onKeyDown(TextView.java:7442)
at android.view.KeyEvent.dispatch(KeyEvent.java:2692)
at android.view.View.dispatchKeyEvent(View.java:12450)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.widget.ScrollView.dispatchKeyEvent(ScrollView.java:389)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1896)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:428)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1820)
at android.app.Dialog.dispatchKeyEvent(Dialog.java:811)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:342)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5037)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4905)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4585)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4642)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4585)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4642)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4479)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4445)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4585)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4453)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4642)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4426)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7092)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7061)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7022)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7195)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:186)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)