Background Edittext Alpha (transparency)

Question

I would like to know how to make the Edittext fund transparent, in this way:

I tried in the following ways, but without success:

edt.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <corners android:radius="5dp" />
    <padding
        android:bottom="4dp"
        android:left="4dp"
        android:right="4dp"
        android:top="4dp" />
    <solid android:color="@color/editText_alpha" />
</shape>

And I tried to set it straight onCreate:

mEmailView.setAlpha(0.7f);

Answer 1

I tested it here, and the transparence seems to work properly like this

<EditText      
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"//coloquei padding para criar espaçamento entre as extremidades e a letra
android:background="#6affffff" //Transaparencia pode ser adiciona aqui
android:hint="Texto da descrição" />

can be used tbm @android:color/transparent to get value 100% transaparente

Answer 2

The only way it worked was to replace the shape by a gradient

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <corners android:radius="5dp" />
    <padding
        android:bottom="4dp"
        android:left="4dp"
        android:right="4dp"
        android:top="4dp" />
    <gradient
        android:centerColor="#9CE9E9E9"
        android:endColor="#9CE9E9E9"
        android:startColor="#9CE9E9E9" />
</shape>