If you are curious about using the ButterKnife Kotlin dependency in Android, then you have come to the right blog. Actually, there is ‘NO NEED‘ for it!
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In Kotlin you can directly access your widgets by their ID names defined in the XML file. Yes you read it right.
Access your widgets by their ID names defined in the XML file
ButterKnife Kotlin Example
Once you have required Kotlin dependency in your project as shown below:
implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"Learn about using switch case in Kotlin here.
You can easily start building your XML File. In the example below we have 3 Android widgets with id: txt1, txt2, edtxt.
<TextView
android:id="@+id/txt1"
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/txt2"
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/edtxt"
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" />Notice how we are accessing these widgets directly:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
// use the kotlin property
txt1.text="Hi bla bla"
txt2.text="buubububub"
//set textcolor
txt1.setTextColor(ContextCompat.getColor(this, R.color.colorAccent))
edtxt.hint="nhdodfhfgf"
txt1.setOnClickListener{ view->
onClick(view)
}
}
fun onClick(view: View) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
...
}That’s all you need to know about how to magically use butterknife dependency without writing much code.
