Question

我一直在努力让这一天全天工作，并最终通过设置一些边距（见代码）让它工作，但我不知道它为什么会起作用

    //should this be a try/catch?
    Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/Kefa.ttc");

    LinearLayout sampleLinearLayout = new LinearLayout(this);
    LinearLayout.LayoutParams layout = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,  LayoutParams.MATCH_PARENT);
    sampleLinearLayout.setOrientation(LinearLayout.VERTICAL);
    sampleLinearLayout.setBackgroundColor(Color.WHITE);
    sampleLinearLayout.setLayoutParams(layout);

    TextView menuItemTitle = new TextView(this);
    menuItemTitle.setId(2);
    menuItemTitle.setText("All You Can Eat\t\t   $13.99");
    menuItemTitle.setTextSize(35);
    menuItemTitle.setBackgroundColor(Color.TRANSPARENT);
    menuItemTitle.setTypeface(tf);
    menuItemTitle.setTextColor(Color.argb(255, 77, 30, 16));

    RelativeLayout.LayoutParams menuItemTitleParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    menuItemTitleParams.addRule(RelativeLayout.CENTER_HORIZONTAL);

    //****why does setting the TOP margin work??****
    menuItemTitleParams.setMargins(0, 50, 0, 0);
    menuItemTitle.setLayoutParams(menuItemTitleParams);

    TextView menuItemDesc = new TextView(this);
    menuItemDesc.setText("All you can ribs, chicken, pork and sides you can stomach to eat\n\tAlso includes dessert!");
    menuItemDesc.setTextSize(15);
    menuItemDesc.setBackgroundColor(Color.TRANSPARENT);
    menuItemDesc.setTextColor(Color.argb(255, 77, 30, 16));
    menuItemDesc.setLayoutParams(menuItemTitleParams);

    RelativeLayout.LayoutParams menuItemDescParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    menuItemDescParams.addRule(RelativeLayout.CENTER_HORIZONTAL);

    //If i comment out the line of code below, the margin above still places the text
    //below the title.
    menuItemDescParams.addRule(RelativeLayout.BELOW, menuItemTitle.getId());

    //##menuItemTitle.setLayoutParams(menuItemDescParams);
    menuItemDesc.setLayoutParams(menuItemDescParams);


    RelativeLayout relativeLayout = new RelativeLayout(this);
    relativeLayout.setBackgroundColor(Color.TRANSPARENT);
    RelativeLayout.LayoutParams subMenuLayoutParams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,  LayoutParams.WRAP_CONTENT);
    subMenuLayoutParams.setMargins(400, 0, 400, 0);
    relativeLayout.setLayoutParams(subMenuLayoutParams);

    relativeLayout.addView(menuItemTitle);
    relativeLayout.addView(menuItemDesc);

    sampleLinearLayout.addView(relativeLayout);

    setContentView(sampleLinearLayout);

如果我没有为menuItemTitle TextView的TOP设置边距，则menuItemDesc Textview文本位于屏幕上menuTitle文本的顶部。

为什么我的menuItemDescParams规则不足以支持BELW
如果我们不关心＃1（我这样做），为什么扩展menuItemTitle边缘的TOP移动menuItemTitle textview下面的menuItemDesc？如果我注释掉BELOW的代码行，设置边距仍然有效。想想看，我认为＃1非常重要

Answer 1

我自己解决了这个问题，如评论中所述

线性布局内部的相对布局（里面有2个文本视图）可以工作 - 但我不知道为什么

1 个答案: