Question

Here is my problem. I setup the buttons exactly the way they are setup in the Android documentation, but I am getting a warning, and the button will not do anything.

Here is my Java code:

package com.variDice;

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;

public class VariDiceActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //die1Clicked();
    }

    private void die1Clicked() {
        ImageButton die1button = (ImageButton)findViewById(R.id.die1button);
        die1button.setImageResource(R.drawable.icon);
    }
}

…and the XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:weightSum="1" android:layout_gravity="center_horizontal">

    <ImageView 
        android:id="@+id/varidice_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/icon"></ImageView>
    <ImageButton
        android:id="@+id/die1button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="@null"></ImageButton>

</LinearLayout>

…and the warning:

The method die1Clicked from the type VariDiceActivity is never used locally.

I must say that I am completely new to Android development. I made my app for the iPhone, and I am now trying to make a version for the android. The iPhone version was sooo much easier, because of the better interface builder (so I can just make an action and connect it to the button that way), so this is almost impossibly hard for me to understand. In other words, I do not understand how you connect an action to the button. Could somebody please tell me what I am doing wrong?

Answer 1

Try this in your xml:

<ImageButton
    android:id="@+id/die1button"
    android:onClick="die1Clicked"
    ...></ImageButton>

And in your code, change the method signature to:

public void die1Clicked(android.view.View v) {
    ImageButton die1button = (ImageButton)findViewById(R.id.die1button);
    die1button.setImageResource(R.drawable.icon);
}

Here is the Android Button tutorial.