How to make ImageButton clickable in Android Studio?

Question

I have done an immense amount of research and for whatever reason whatever I try I cannot get an ImageButton to be clickable in Android studio. I have tried numerous things but I must be missing something. I will past XML file below and then Java below that. When I put setOnClickListener method I get a cannot resolve message and same for when I do onClickListener. I would like the button to link to a webpage. Please help!

   <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    tools:context="com.autismacademyed.www.autismacademy.AutismAcademy">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:textColor="@android:color/black"
        android:textSize="36sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.173" />

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/logo"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintHorizontal_bias="0.0" />

    <ImageButton
        android:id="@+id/imageButtonYellow"
        android:layout_width="109dp"
        android:layout_height="125dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:background="@null"
        android:scaleType="centerCrop"
        android:visibility="visible"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView2"
        app:srcCompat="@mipmap/ic_yellowpuzzlepiece"
        android:onClick="onClick"/>

</android.support.constraint.ConstraintLayout>

Here is Java:

package com.autismacademyed.www.autismacademy;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageButton;

public class AutismAcademy extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_autism_academy);
    }

    ImageButton imageButtonYellow = (ImageButton)findViewById(R.id.imageButtonYellow);
   imageButtonYellow.setOnClickListener(new View.onClickListener()

    public void onClick (View v) {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.aaed.org"));
        startActivity(browserIntent);
    }

}

Answer 1

Remove the setOnClickListener since you already specify in your view that the onclick function for the button is onClick. To avoid confusion rename your button android:onClick="onClick", like android:onClick="imageButtonOnClick".

And in your java code you can just use this

package com.autismacademyed.www.autismacademy;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageButton;

public class AutismAcademy extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_autism_academy);
    }

    public void imageButtonOnClick(View v) {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.aaed.org"));
        startActivity(browserIntent);
    }

}