activity_main.xml
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F4F0EC"
android:padding="16dp"
tools:context=".MainActivity">
<!-- No Transparency -->
<ImageButton
android:id="@+id/ib"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="64dp"
android:src="@drawable/share_solid"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!-- Background Transparent by XML -->
<!--
You can also use
android:background="@android:color/transparent"
android:background="@null"
-->
<!--
It keep the button click effect.
android:background="?android:selectableItemBackground"
-->
<ImageButton
android:id="@+id/ib2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:src="@drawable/share_solid"
android:padding="8dp"
android:background="?android:selectableItemBackground"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ib" />
<!-- Background Transparent Programmatically + click effect -->
<ImageButton
android:id="@+id/ib3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:src="@drawable/share_solid"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ib2" />
<!-- Background Transparent Programmatically -->
<ImageButton
android:id="@+id/ib4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:src="@drawable/share_solid"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ib3" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package com.cfsuman.androidtutorials;
import android.graphics.Color;
import android.os.Bundle;
import android.app.Activity;
import android.util.TypedValue;
import android.widget.ImageButton;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the widgets reference from XML layout
ImageButton ib3 = findViewById(R.id.ib3);
ImageButton ib4 = findViewById(R.id.ib4);
// Set the third image button background transparent
// This method allow us to show click effect
TypedValue outValue = new TypedValue();
getApplicationContext().getTheme().resolveAttribute(
android.R.attr.selectableItemBackground,
outValue,
true
);
ib3.setBackgroundResource(outValue.resourceId);
// Another way (No button click effect)
ib4.setBackgroundColor(Color.TRANSPARENT);
}
}



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