@Override
protected void onDraw(final Canvas canvas) {
if (!mIsEnabled) {
return;
}
if (!mCenterDefined) {
// One time computation here, because we can't rely on getWidth() to be computed at
// constructor time or in onFinishInflate :(.
mCenterX = getWidth() / 2;
mCenterY = getWidth() / 2;
mCenterDefined = true;
}
final int level = mLevelSource.getSpeechLevel();
// Either ease towards the target level, or decay away from it depending on whether
// its higher or lower than the current.
if (level > mCurrentVolume) {
mCurrentVolume = mCurrentVolume + ((level - mCurrentVolume) / 4);
} else {
mCurrentVolume = mCurrentVolume * 0.95f;
}
final float radius = mMinimumLevel + (1f - mMinimumLevel) * mCurrentVolume / 100;
mPrimaryLevelPaint.setStyle(Style.FILL);
canvas.drawCircle(mCenterX, mCenterY, radius * mMaximumLevelSize, mPrimaryLevelPaint);
}
