Why isn't the button stretched to edges of the screen?-CodePudding

XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="qwerqwerqwerqweqwerqqwerqwerqwerqweqwerqwerqwerqwerqwerwerrqwerqwerqwerqwerqwerqwerqweqwerqwerqwerqwerqwerwerrqwerqwerqwerwerqwerqwerqwerwerrqwerqwerqwer"/>

    <Button
        android:id="@ id/true_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="qwerqwerqwerqweqwerqqwerqwerqwerqweqwerqwerqwerqwerqwerwerrqwerqwerqwerqwerqwerqwerqweqwerqwerqwerqwerqwerwerrqwerqwerqwerwerqwerqwerqwerwerrqwerqwerqwer"/>

</LinearLayout>

Output:

Why isn't the button stretched to edges of the screen whereas TextView is?

CodePudding user response：

As you can see in the properties, the default width set for the button is 320dp, so if you don't mention any width, it will be maxed at 320dp. If you want to increase it, you need to enter it manually.

For the TextView, there is no default width set.

Hence, the Button has that view.

If you want to open those properties, you can get them from here:

select your widget -> Attributes Tab -> All Attributes -> maxWidth

CodePudding user response：

if you want the button stretcged to screen edge you can write

android:layout_width="match_parent"