[英]addRule(RelativeLayout.BELOW, id) doesn't work
I try to create 5 buttons below each other, but they appear on each other 我尝试在彼此下方创建5个按钮,但它们彼此显示
ArrayList<Button> btn = new ArrayList<>();
for (int i=0; i<10; i++) {
Log.d("TEST", Integer.toString(i));
btn.add(new Button(this));
btn.get(i).setText(Integer.toString(i));
if (i == 0) {
btn.get(i).setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
} else {
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.BELOW, btn.get(i-1).getId());
btn.get(i).setLayoutParams(lp);
}
ll.addView(btn.get(i));
What is wrong with my code? 我的代码有什么问题?
Solved by adding btn.get(i).setId(View.generateViewId()). 通过添加btn.get(i).setId(View.generateViewId())解决。 All id of buttons was -1 before using setId().
使用setId()之前,按钮的所有ID均为-1。
From how you've named your layout, "ll", it seems you're adding those buttons to a LinearLayout. 从您将布局命名为“ ll”的方式来看,您似乎正在将这些按钮添加到LinearLayout中。 If that's the case, try changing that container layout to a RelativeLayout.
如果是这种情况,请尝试将该容器布局更改为RelativeLayout。
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