[android-beginners] how to create custom button and add a click listener?

[nikogamulin]

Hi,

I would like to create a custom button and make it interactive by
adding a click or touch listener.

I created a RoundButton class the following way:

public class RoundButton extends View {

    private String buttonText;
    private static final int buttonRadius = 36;
    private static final float textSize = 16;

    private int px;
    private int py;

    private int buttonState;
    private int textHeight;

    private Paint circlePaint;
    private Paint textPaint;

    public void SetPosition(int px, int py)
    {
        this.px = px;
        this.py = py;
    }

    @Override
    protected void onDraw(Canvas canvas) {

        if(px == 0 || py == 0)
        {
            px = 50;
            py = 50;
        }

        //int radius = Math.min(px, py);

        canvas.drawCircle(px, py, buttonRadius, circlePaint);
        canvas.save();

        int textWidth = (int)textPaint.measureText(buttonText);
        int cardinalX = px - textWidth/2;
        int cardinalY = py - textHeight/2;
        canvas.drawText(buttonText, cardinalX, cardinalY, textPaint);
        canvas.restore();

        //super.onDraw(canvas);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int
heightMeasureSpec) {

        int measuredWidth = measure(widthMeasureSpec);
        int measuredHeight = measure(heightMeasureSpec);

        int d = Math.min(measuredWidth, measuredHeight);
        setMeasuredDimension(d, d);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    private int measure(int measureSpec)
    {
        int result = 0;

        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if(specMode == MeasureSpec.UNSPECIFIED)
        {
            result = 200;
        }
        else
        {
            result = specSize;
        }
        return result;
    }



    public RoundButton(Context context) {
        super(context);
        initRoundButton();
    }

    public RoundButton(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        initRoundButton();
    }

    protected void initRoundButton()
    {
        setFocusable(true);

        circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        circlePaint.setColor(R.color.roundButtonUpColor);
        circlePaint.setStyle(Paint.Style.FILL_AND_STROKE);

        Resources r = this.getResources();

        textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        textPaint.setColor(r.getColor(R.color.roundButtonTextColor));

        textPaint.setTextSize(textSize);
        if(buttonText == null)
        {
            textHeight = (int)textPaint.measureText("Yy");
        }
        else
        {
            textHeight = (int)textPaint.measureText(buttonText);
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        return super.onTouchEvent(event);
    }

    public void setButtonText(String buttonText) {
        this.buttonText = buttonText;
    }

    public String getButtonText() {
        return buttonText;
    }

    protected class ButtonState
    {
        public static final int BUTTON_STATE_READY = 0;
        public static final int BUTTON_STATE_PRESSED = 1;
    }

    public void test()
    {
        int i = 0;
    }

}

Then I added this custom view to the main layout and bound the control
the following way:

rbActionButton = (RoundButton)findViewById(R.id.actionButton);

        rbActionButton.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {

                onActionButton();

            }
        });

but the onClick() doesn't execute when I touch the button.

Any ideas what could be wrong here?

Thanks!

Niko

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