如何以编程方式为视图设置背景？

Question

I added a View to layout programmatically to draw a horizontal line.

Below is java code.

  // I want to add a view to ll
  LinearLayout ll = (LinearLayout)findViewById(R.id.main);

  LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
  View view = new View(this);
  ll.addView(view);
  view.setLayoutParams(params);

  // this method does not work.
  view.setBackgroundDrawable(getResources().getDrawable(R.drawable.division_line));

my division_line.xml in /drawable is:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke android:color="#800400"
            android:width="2dp"/>
</shape>

I tried to apply division_line.xml to View but it doesn't work. What method should I use?

Answer 1

view.setBackground(getResources().getDrawable(R.drawable.division_line)) instead of view.setBackgroundDrawable(...)

and keep in mind that first 2dp isn't much and you are adding a view with no layout properties so its size is 0px x 0px

you can do so in code: view.setLayoutParams(new AbsListView.LayoutParams(300, 300));