how to set width which is equal to another widget on android

Question

I need to draw a horizontal line below a text field such that the width of the line equals the text width (not the width of the full screen).

In my app I have a textview

Answer 1

If you're using a Layout other than a RelativeLayout, you can match the widths of your widgets programmatically, such as in this example:

layout.xml:

Notice that both text fields are both set to wrap_content.

Main.java:

TextView tv1 = (TextView) findViewById(R.id.text1);
TextView tv2 = (TextView) findViewById(R.id.text2);

if(tv1.getWidth() < tv2.getWidth())
    tv1.setWidth(tv2.getWidth());
else
    tv2.setWidth(tv1.getWidth());

If you have multiple widgets that you want to have a uniform width, just repeat the above code for the new element. For example, let's say there was a button I wanted to adjust the width to, to match the other elements:

if(tv2.getWidth() < button)
    tv2.setWidth(button.getWidth());
else
    button.setWidth(tv2.getWidth());