Set the width of a Textview by the maximum number of characters

Question

I’m creating a layout_item for my Listview, but I want all elements to be aligned, but some Textview can have size variation (they take the value of a numeral that can vary from 0 to 1000) so I’m assigning fixed values to their width.

The problem is that I do not know if the value I am assigning is enough for every type of screen and I would like to know if there is an ideal shape or dimension to use in this case.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginVertical="5dp"
android:orientation="horizontal">


<ImageView
    android:id="@+id/imagem"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_centerVertical="true"
    android:src="@drawable/bebidas_s_alcool" />

<TextView
    android:id="@+id/amigo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_toStartOf="@id/lista"
    android:layout_toLeftOf="@id/lista"
    android:layout_toEndOf="@id/imagem"
    android:layout_toRightOf="@id/imagem"
    android:paddingLeft="10dp"
    android:text="Nome do Item"
    android:textColor="@color/Texto" />

<LinearLayout
    android:id="@+id/lista"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_toLeftOf="@id/rs"
    android:gravity="center">

    <ImageButton
        android:id="@+id/botaomenos"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:onClick="menos"
        android:src="@drawable/menos" />

    <TextView
        android:id="@+id/quantidade"
        android:layout_width="50sp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:padding="5dp"
        android:text="5.55"
        android:textColor="@color/Texto" />

    <ImageButton
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginRight="5dp"
        android:onClick="mais"
        android:src="@drawable/mais" />

</LinearLayout>

<TextView
    android:id="@+id/rs"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_toLeftOf="@id/valor"
    android:padding="3dp"
    android:text="R$"
    android:textColor="@color/Texto" />

<TextView
    android:id="@+id/valor"
    android:layout_width="60sp"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:gravity="end"
    android:text="5000,00"
    android:textColor="@color/Texto" />


  </RelativeLayout>

As can be seen in the layout above the Textview and nescessario specify the size are the ids quantidade e valor and the dimension I’m using is sp

Answer 1

Specifying the property "layout_width" as "wrap_content" in the two Textview will solve your problem because the attribute "wrap_content" serves precisely for this, occupy the space necessary for full display of a certain content.