android.view.KeyEvent#KEYCODE_T源码实例Demo

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    switch (keyCode) {
        case KeyEvent.KEYCODE_R:
            mViewModel.addRectLayer();
            return true;
        case KeyEvent.KEYCODE_T:
            mViewModel.addTriangleLayer();
            return true;
        case KeyEvent.KEYCODE_O:
            mViewModel.addOvalLayer();
            return true;
    }

    if (mBinding.documentView.hasFocus()) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_DEL:
            case KeyEvent.KEYCODE_FORWARD_DEL:
                return onContextMenuAction(DELETE);
        }

        if (event.isCtrlPressed()) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_X:
                    return onContextMenuAction(CUT);
                case KeyEvent.KEYCODE_C:
                    return onContextMenuAction(COPY);
                case KeyEvent.KEYCODE_V:
                    return onContextMenuAction(PASTE);
                case KeyEvent.KEYCODE_D:
                    return onContextMenuAction(DUPLICATE);
                case KeyEvent.KEYCODE_G:
                    return onContextMenuAction(GROUP);
            }
        }
    }

    return super.onKeyDown(keyCode, event);
}
 

@Override public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode) {
        case KeyEvent.KEYCODE_D:
            mPaint.setDither(!mPaint.isDither());
            invalidate();
            return true;
        case KeyEvent.KEYCODE_T:
            mDoTiming = !mDoTiming;
            invalidate();
            return true;
    }
    return super.onKeyDown(keyCode, event);
}