如何解决:使用自定义视图实现双向数据绑定时“找不到属性'android:text'的getter”?
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【中文标题】如何解决:使用自定义视图实现双向数据绑定时“找不到属性\'android:text\'的getter”?【英文标题】:How to solve: "cannot find getter for attribute 'android:text'" when implementing two-way data binding with custom view?如何解决:使用自定义视图实现双向数据绑定时“找不到属性'android:text'的getter”? 【发布时间】:2018-05-30 16:40:29 【问题描述】:我遇到了许多类似的问题,但似乎没有一个答案能解决我的问题。我实现了一个自定义EditText
,我希望它与双向数据绑定兼容。问题是,每次我尝试编译时都会出现错误:
Error:java.lang.IllegalStateException: failed to analyze: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:Cannot find the getter for attribute 'android:text' with value type java.lang.String on com.app.toolkit.presentation.view.CustomEditText. file:/Users/humble-student/Home/workspace/android/application/app/src/main/res/layout/login_view.xml loc:68:8 - 81:69 ****\ data binding error ****
at org.jetbrains.kotlin.analyzer.AnalysisResult.throwIfError(AnalysisResult.kt:57)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules(KotlinToJVMBytecodeCompiler.kt:137)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:158)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:61)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:107)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:51)
at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:92)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:386)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:96)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:892)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:96)
at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:919)
at
这是我的实现:
自定义编辑文本
class CustomEditText @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : LinearLayout(context, attrs, defStyleAttr)
// ...
private lateinit var editText_input: EditText
private lateinit var textView_errorMessage: TextView
private var isErrorDisplayed = false
private var inputTextOriginalColor: ColorStateList? = null
init
orientation = VERTICAL
clearContainerFormatting()
createEditTextInput(context, attrs, defStyleAttr)
createTextViewErrorMessage(context)
addView(editText_input)
addView(textView_errorMessage)
fun setError(message: String)
//...
fun getText(): String = editText_input.text.toString()
fun setText(text: String) = editText_input.setText(text)
// ...
型号
data class SampleData(
private var _content: String
) : BaseObservable()
var content: String
@Bindable get() = _content
set(value)
_content = value
notifyPropertyChanged(BR.content)
使用带有数据绑定的 CustomView 的客户端
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<import type="android.view.View" />
<variable
name="data"
type="SampleData" />
<variable
name="presenter"
type="SamplePresenter" />
</data>
<RelativeLayout
android:layout_
android:layout_
android:animateLayoutChanges="true"
tools:context=".sample_view.presentation.view.SampleView">
<NotificationPopup
android:id="@+id/notificationPopup"
android:layout_
android:layout_
android:clipToPadding="false"
android:elevation="4dp"
app:allowManualExit="true" />
<LinearLayout
android:layout_
android:layout_
android:layout_centerInParent="true"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="@+id/textView_mirror"
android:layout_
android:layout_
android:fontFamily="sans-serif"
android:text="@data.content"
android:textSize="16sp"
android:textStyle="bold"
tools:text="test" />
<CustomEditText
android:id="@+id/customEditText_sample"
style="@style/RegisterInput"
android:layout_
android:layout_
android:hint="Type anything"
android:text="@=data.content" />
<Button
android:id="@+id/button_validateInput"
style="@style/Widget.AppCompat.Button.Colored"
android:layout_
android:layout_
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:onClick='@(v) -> presenter.onValidateDataClick(customEditTextSample.getText())'
android:text="Validate Input" />
</LinearLayout>
</RelativeLayout>
</layout>
P.S.:如果我将 CustomEditText
替换为常规的 EditText
小部件,它可以完美运行
【问题讨论】:
【参考方案1】:很有趣,但我找到了一个很棒的 post on medium 来帮助我解决这个问题。基本上我需要的是CustomEditTextBinder
:
@InverseBindingMethods(
InverseBindingMethod(
type = CustomEditText::class,
attribute = "android:text",
method = "getText"
)
)
class CustomEditTextBinder
companion object
@JvmStatic
@BindingAdapter(value = ["android:textAttrChanged"])
fun setListener(editText: CustomEditText, listener: InverseBindingListener?)
if (listener != null)
editText.addTextChangedListener(object : TextWatcher
override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int)
override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int)
override fun afterTextChanged(editable: Editable)
listener.onChange()
)
@JvmStatic
@BindingAdapter("android:text")
fun setText(editText: CustomEditText, text: String?)
text?.let
if (it != editText.text)
editText.text = it
这可能看起来很奇怪,但您实际上不需要在任何地方调用它,只需添加类,框架将负责通过注释处理找到它。请注意,setText
对于防止无限循环非常重要。我还补充说:
var text: String?
get() = editText_input.text.toString()
set(value)
editText_input.setText(value)
fun addTextChangedListener(listener: TextWatcher) =
editText_input.addTextChangedListener(listener)
在CustomEditText
.
这是example of the implementation
【讨论】:
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