@Override
public void onDraw(Canvas canvas) {
// If down, draw opaque. Otherwise draw transparent.
canvas.drawBitmap(buttonBitmap, 0, 0, isDown ? parent.downPaint : parent.upPaint);
super.onDraw(canvas);
}
/**
* Generates bitmap used for drawing button.
*
* @param radius Radius of button in pixels.
*/
@Override
void generateBitmap() {
super.generateBitmap();
// Size and shape
buttonShape.setShape(new OvalShape());
buttonShape.setBounds(
new Rect(PADDING, PADDING, (int) radius * 2 - PADDING, (int) radius * 2 - PADDING));
// Create button bitmap and render shape
buttonBitmap = Bitmap.createBitmap((int) radius * 2, (int) radius * 2, Bitmap.Config.ARGB_4444);
Canvas handleCanvas = new Canvas(buttonBitmap);
buttonShape.getPaint().set(parent.fillPaint);
buttonShape.draw(handleCanvas);
// Set text style
textPaint.setStyle(Paint.Style.FILL);
textPaint.setTypeface(Typeface.DEFAULT_BOLD);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setColor(Color.BLACK);
// Set size (one character has a standard design, more has dynamic size)
if (label.length() == 1) textPaint.setTextSize(radius);
else textPaint.setTextSize(radius / label.length() * 2.5f);
// Set paint to clear text from button
textPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
// Render the button
handleCanvas.drawText(label, radius, radius + (textPaint.getTextSize() * .33333f), textPaint);
}
@Override
void writeXml(XmlSerializer serializer, OutputStream fileos)
throws IllegalArgumentException, IllegalStateException, IOException {
serializer.startTag(null, "button");
super.writeXml(serializer, fileos);
// set an attribute called "attribute" with a "value" for <child2>
serializer.attribute(null, "label", label);
serializer.attribute(null, "buttonIndex", Integer.toString(buttonIndex));
serializer.endTag(null, "button");
}
