https://code.google.com/archive/p/android-traditional-chinese-ime/
适用于台湾的注音输入法！
修改后使之支持TV遥控器操作。
重写onDraw方法绘制选中状态
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
currentKeyboard = (SoftKeyboard) this.getKeyboard();
mKeys = currentKeyboard.getKeys();
Paint p = new Paint();
p.setColor(getResources().getColor(R.color.select_key));
//p.setStyle(Paint.Style.STROKE);
//p.setStrokeWidth(4.0f);
if (mCurrFocusIndex > mKeys.size()) {
mCurrFocusIndex = mKeys.size() - 1;
}
p.setAntiAlias(true);
p.setAlpha(90);
Key focusedKey = mKeys.get(mCurrFocusIndex);
RectF rect = new RectF(focusedKey.x, focusedKey.y + 4, focusedKey.x + focusedKey.width, focusedKey.y + focusedKey.height + 2);
if (this.isFocusFlag()) {
canvas.drawRoundRect(rect, 5, 5, p);
}
}