How to create EditText with cross(x) button at end of it?

Use the following layout:

<FrameLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="9dp"
    android:padding="5dp">

    <EditText
        android:id="@+id/calc_txt_Prise"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"  
        android:layout_marginTop="20dp"
        android:textSize="25dp"
        android:textColor="@color/gray"
        android:textStyle="bold"
        android:hint="@string/calc_txt_Prise"
        android:singleLine="true" />

    <Button
        android:id="@+id/calc_clear_txt_Prise"      
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp"
        android:layout_gravity="right|center_vertical"
        android:background="@drawable/delete" />

</FrameLayout>

You can also use the button's id and perform whatever action you want on its onClickListener method.

2020 solution via Material Design Components for Android:

Add Material Components to your gradle setup:

Look for latest version from here: https://maven.google.com/

implementation 'com.google.android.material:material:1.3.0'

or if you havent updated to using AndroidX libs, you can add it this way:

implementation 'com.android.support:design:28.0.0'

Then

<com.google.android.material.textfield.TextInputLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/hint_text"
    app:endIconMode="clear_text">

  <com.google.android.material.textfield.TextInputEditText
      android:layout_width="match_parent"
      android:layout_height="wrap_content"/>

</com.google.android.material.textfield.TextInputLayout>

Pay attention to: app:endIconMode="clear_text"

As discussed here Material design docs

If you happen to use DroidParts, I've just added ClearableEditText.

Here's what it looks like with a custom background & clear icon set to abs__ic_clear_holo_light from ActionBarSherlock: