Java/Android : generic method - apply same functionality to different objects

Question

我正在尝试在我的 Android 项目中创建一些辅助方法 - 设置带有轮廓的背景的方法。我想方法接受不同类型的对象(最小是不同的布局)并在它们上调用 setBackground() 。我的代码:

@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
private static <I> void setBackgroundOutlined(Context context, 
                                                I item, 
                                                String backgroundColor, 
                                                String outlineColor, int outlineThickness,
                                                Boolean setStatesPressed) {


    GradientDrawable shapeDrawable = new GradientDrawable();
    shapeDrawable.setStroke(CF.floatToPixels(context, outlineThickness), 
    Color.parseColor(outlineColor));
    shapeDrawable.setColor(Color.parseColor(backgroundColor));


    StateListDrawable states = new StateListDrawable();

    states.addState(new int[] {android.R.attr.state_pressed, 
    android.R.attr.state_enabled}, 
    context.getResources().getDrawable(R.drawable.textview_pressed_color));
    states.addState(StateSet.WILD_CARD, shapeDrawable);


    if (item instanceof RelativeLayoutWithContextMenuInfo) {

        RelativeLayoutWithContextMenuInfo item2= (RelativeLayoutWithContextMenuInfo)item;
        if (android.os.Build.VERSION.SDK_INT < 16) {
            item2.setBackgroundDrawable(states);
        } else {
            item2.setBackground(states);
        }

    } else if (item instanceof LinearLayout) {

        LinearLayout item2= (LinearLayout)item;
        if (android.os.Build.VERSION.SDK_INT < 16) {
            item2.setBackgroundDrawable(states);
        } else {
            item2.setBackground(states);
        }

    }




}

我真的不喜欢在条件下重复代码。有什么建议可以让它更清楚吗？谢谢，J。

Answer 1

除了雅各布连字符答案:

您不需要通用方法，因为您只需要传递 ViewGroup 类型或其子类的参数:

private static void setBackgroundOutlined(Context context, 

 /* you can pass any layout as item -> */ ViewGroup item, 
                                          String backgroundColor, 
                                          String outlineColor,
                                          int outlineThickness,
                                          Boolean setStatesPressed) {

    // apply you logic on a item based on OS runtime API
}