Friday, March 6, 2020

android kotlin - Material button center icon only

MainActivity.kt

package com.example.jetpack

import android.content.Context
import android.os.Bundle
import android.util.TypedValue
import androidx.appcompat.app.AppCompatActivity
import com.google.android.material.button.MaterialButton
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // programmatically make button icon only and center of button
        button5.setOnClickListener {
            (it as MaterialButton).apply {
                minimumWidth = 0
                minWidth = 0

                setPadding(
                    5.toDp(context),
                    5.toDp(context),
                    5.toDp(context),
                    5.toDp(context)
                )

                text = ""
                icon = getDrawable(R.drawable.ic_delete_forever)
                iconGravity = MaterialButton.ICON_GRAVITY_TEXT_START
                iconPadding = 0
            }
        }
    }
}


// extension method to convert pixels to dp
fun Int.toDp(context: Context):Int = TypedValue.applyDimension(
    TypedValue.COMPLEX_UNIT_DIP,this.toFloat(),context.resources.displayMetrics
).toInt()
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    android:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:insetLeft="0dp"
        android:insetTop="0dp"
        android:insetRight="0dp"
        android:insetBottom="0dp"
        android:minWidth="0dp"
        android:text=""
        app:icon="@drawable/ic_delete_forever"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:minWidth="0dp"
        android:minHeight="0dp"
        android:padding="5dp"
        app:icon="@drawable/ic_delete_forever"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconTint="#3D2B1F"
        app:iconTintMode="src_atop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:minWidth="0dp"
        android:minHeight="0dp"
        android:padding="0dp"
        app:icon="@drawable/ic_delete_forever"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconTint="#3D2B1F"
        app:iconTintMode="src_atop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:minWidth="0dp"
        android:paddingStart="5dp"
        android:paddingEnd="5dp"
        app:icon="@drawable/ic_delete_forever"
        app:iconGravity="textEnd"
        app:iconPadding="0dp"
        app:iconSize="48dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button3" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Click Me"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button4" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button6"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_marginTop="32dp"
        android:insetLeft="0dp"
        android:insetTop="0dp"
        android:insetRight="0dp"
        android:insetBottom="0dp"
        android:minWidth="0dp"
        android:text=""
        app:icon="@drawable/ic_delete_forever"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button5" />

</androidx.constraintlayout.widget.ConstraintLayout>
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