问题描述
我正在尝试将Kotlin与Butterknife一起用于我的Android应用程序.
I'm trying to use Kotlin with Butterknife for my Android Application.
这是我的build.gradle
Here is my build.gradle
dependencies {
...
compile 'com.jakewharton:butterknife:8.0.1'
kapt 'com.jakewharton:butterknife-compiler:8.0.1'
}
kapt {
generateStubs = true
}
我也有一个EditText,我想在更改后使用ButterKnife显示一条消息:
I also has an EditText and I want to show a message using ButterKnife when it is changed:
@OnTextChanged(R.id.input)
fun test() {
toast(1)
}
但是,什么也没发生.我在函数中添加了一个断点-甚至没有执行.
However, nothing happens. I put a breakpoint into the function - and it is not even executed.
PS:我听说过kotterknife,但是我看到了示例和纯黄油刀.
P.S: I have heard about kotterknife, however I have seen an example with pure Butterknife.
我在做什么错了?
推荐答案
科特林(Kotlin)不需要黄油刀.您可以直接使用以下内容:
There's no need for butterknife in Kotlin. You can directly use the following:
//app:build.gradle文件
// app:build.gradle file
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
applicationId "com.example.nikhiljadhav.myapplication"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:26.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:design:26.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.0'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.0'
}
kapt {
generateStubs = true
}
//xml布局文件
<TextView
android:id="@+id/tvHello"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp" />
<TextView
android:id="@+id/tvId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp" />
<EditText
android:id="@+id/etDemo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp"
android:onClick="onClick"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp" />
//MainActivity.kt文件
// MainActivity.kt file
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
// use the kotlin property
tvHello.text="Hi bla bla"
tvId.text="buubububub"
//set textcolor
tvId.setTextColor(ContextCompat.getColor(this, R.color.colorAccent))
etDemo.hint="nhdodfhfgf"
tvId.setOnClickListener{ view->
onClick(view)
}
fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
}
fun onClick(view: View) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
...
}
对于onTextChangeListner:
For onTextChangeListner:
etText.addTextChangedListener(object : TextWatcher{
override fun afterTextChanged(p0: Editable?) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
})
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