open-keychain/OpenPGP-Keychain-API-Demo/res/layout/aidl_demo2.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <Button
            android:id="@+id/aidl_demo_select_encryption_key"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="selectEncryptionKeysOnClick"
            android:text="Select encryption key(s)" />

        <EditText
            android:id="@+id/aidl_demo_keyrings"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="keyrings output"
            android:textAppearance="@android:style/TextAppearance.Small" />

        <Button
            android:id="@+id/aidl_demo_get_keyrings_strings"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="getKeyringsStringsOnClick"
            android:text="getKeyrings as Strings" />

        <Button
            android:id="@+id/aidl_demo_get_keyrings_bytes"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="getKeyringsBytesOnClick"
            android:text="getKeyringsBytes" />
    </LinearLayout>

</ScrollView>