以编程方式将项目添加到一个相对布局 [英] Programmatically adding items to a relative layout

问题描述

我一直在到处寻找一个答案。我是新来的Andr​​oid，并试图以编程方式通过Java而不是XML为项目添加到一个相对布局。我创建了一个测试类尝试一下，但项目一直堆放正确的格式，而不是。我只是希望对方在一个TextView的，现在（最终我将使用的参数的左侧和右侧，但我开始很简单。我缺少什么？

 公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    滚动型SV =新的滚动型（本）;
    RelativeLayout的LL =新的RelativeLayout（本）;
    ll.setId（99）;
    sv.addView（Ⅱ）;
    TextView的电视=新的TextView（本）;
    tv.setText（TXT1）;
    tv.setId（1）;
    TextView中TV2 =新的TextView（本）;
    tv2.setText（TXT2）;
    tv2.setId（2）;
    RelativeLayout.LayoutParams奠定=新RelativeLayout.LayoutParams（RelativeLayout.LayoutParams.WRAP_CONTENT，RelativeLayout.LayoutParams.WRAP_CONTENT）;
    lay.addRule（RelativeLayout.ALIGN_PARENT_TOP）;
    ll.addView（电视打好）;
    RelativeLayout.LayoutParams P =新RelativeLayout.LayoutParams（RelativeLayout.LayoutParams.WRAP_CONTENT，RelativeLayout.LayoutParams.WRAP_CONTENT）;
    p.addRule（RelativeLayout.ALIGN_BOTTOM，tv.getId（））;
    ll.addView（TV2，p）的; this.setContentView（SV）;};
 

解决方案

  p.addRule（RelativeLayout.ALIGN_BOTTOM，tv.getId（））;
 

此线意味着TV2的底部与电视的换句话说底部对齐，它们将互相覆盖起来。你想要的属性是presumably RelativeLayout.BELOW 。然而，我强烈建议使用XML这个代替。

I have been searching everywhere for an answer to this question. I'm new to Android and attempting to add items to a relative layout programmatically through java instead of xml. I have created a test class to try it out but the items keep stacking instead of formatting correctly. I simply want one TextView under the other for now (eventually I will use the left of and right of parameters but I am starting simple. What am I missing?

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ScrollView sv = new ScrollView(this);
    RelativeLayout ll = new RelativeLayout(this);
    ll.setId(99);
    sv.addView(ll);
    TextView tv = new TextView(this);
    tv.setText("txt1");
    tv.setId(1);
    TextView tv2 = new TextView(this);
    tv2.setText("txt2");
    tv2.setId(2);
    RelativeLayout.LayoutParams lay = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    lay.addRule(RelativeLayout.ALIGN_PARENT_TOP);
    ll.addView(tv, lay);
    RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    p.addRule(RelativeLayout.ALIGN_BOTTOM, tv.getId());
    ll.addView(tv2, p);  this.setContentView(sv);};

解决方案

    p.addRule(RelativeLayout.ALIGN_BOTTOM, tv.getId());

This line means that the the bottom of tv2 is aligned with the bottom of tv- in other words, they will cover each other up. The property you want is presumably RelativeLayout.BELOW . However, I strongly recommend using xml for this instead.

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