I added two floating action buttons on a fragment but I always get following error:

**Invalid drawable added to LayerDrawable! Drawable already belongs to another owner but does not expose a constant state**

```
<RelativeLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_margin="30dp"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <ScrollView
        android:layout_weight="1"
        android:id="@+id/scrollView"
        android:layout_marginRight="30dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/layout_main_account">

            <TextView
                android:text="Name"
                android:textStyle="bold"
                android:layout_marginTop="30dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/tv_activity_main_account_name_label"/>

            <EditText
                android:enabled="false"
                android:inputType="none"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/et_activity_main_account_name_label_value"/>
        </LinearLayout>
    </ScrollView>

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

        <View
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="0dp"/>

        <android.support.design.widget.FloatingActionButton
            android:backgroundTint="#000"
            android:layout_marginBottom="5dp"
            android:layout_marginRight="10dp"
            app:layout_anchorGravity="bottom"
            android:layout_width="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_edit_account"
            android:id="@+id/fbtn_activity_main_account_edit_account"/>

        <android.support.design.widget.FloatingActionButton
            android:backgroundTint="#000"
            android:layout_marginBottom="5dp"
            app:layout_anchorGravity="bottom"
            android:layout_width="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_home_account"
            android:id="@+id/fbtn_activity_main_account_manage_addresses"
            app:layout_anchor="@id/fbtn_activity_main_account_edit_account"/>

    </LinearLayout>
</RelativeLayout>

```

**drawable -> ic\_edit\_account.xml**

```
<vector android:height="24dp" android:viewportHeight="60.017"
android:viewportWidth="60.017" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
<path android:fillColor="#FFFFFF" android:pathData="M59.144,3.731l-2.85,-2.851c-1.164,-1.161 -3.057,-1.162 -4.221,0.001l-3.126,3.126H0v56h56V11.097l0.305,-0.305l0,0l2.839,-2.839C60.308,6.789 60.308,4.895 59.144,3.731zM20.047,36.759l3.22,3.22l-4.428,1.208L20.047,36.759zM52.062,12.206L47.82,7.964l1.414,-1.414l4.243,4.242L52.062,12.206zM50.648,13.62L25.192,39.076l-4.242,-4.242L46.406,9.378L50.648,13.62zM54,13.097v44.91H2v-52h44.947L18.829,34.127l-0.188,0.188l-2.121,7.779l-1.226,1.226c-0.391,0.391 -0.391,1.023 0,1.414c0.195,0.195 0.451,0.293 0.707,0.293s0.512,-0.098 0.707,-0.293l1.226,-1.226l7.779,-2.123l26.351,-26.35h0l0.447,-0.447L54,13.097zM57.73,6.539l-2.839,2.839l-4.243,-4.243l2.839,-2.839c0.384,-0.384 1.009,-0.383 1.393,0l2.85,2.85C58.114,5.529 58.114,6.155 57.73,6.539z"/>
</vector>

```

**drawable -> ic\_home\_account.xml**

```
<vector android:height="24dp" android:viewportHeight="512"
android:viewportWidth="512" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
<path android:fillColor="#FFFFFFFF" android:pathData="M506.555,208.064L263.859,30.367c-4.68,-3.426 -11.038,-3.426 -15.716,0L5.445,208.064c-5.928,4.341 -7.216,12.665 -2.875,18.593s12.666,7.214 18.593,2.875L256,57.588l234.837,171.943c2.368,1.735 5.12,2.57 7.848,2.57c4.096,0 8.138,-1.885 10.744,-5.445C513.771,220.729 512.483,212.405 506.555,208.064z"/>
<path android:fillColor="#FFFFFFFF" android:pathData="M442.246,232.543c-7.346,0 -13.303,5.956 -13.303,13.303v211.749H322.521V342.009c0,-36.68 -29.842,-66.52 -66.52,-66.52s-66.52,29.842 -66.52,66.52v115.587H83.058V245.847c0,-7.347 -5.957,-13.303 -13.303,-13.303s-13.303,5.956 -13.303,13.303v225.053c0,7.347 5.957,13.303 13.303,13.303h133.029c6.996,0 12.721,-5.405 13.251,-12.267c0.032,-0.311 0.052,-0.651 0.052,-1.036v-128.89c0,-22.009 17.905,-39.914 39.914,-39.914s39.914,17.906 39.914,39.914v128.89c0,0.383 0.02,0.717 0.052,1.024c0.524,6.867 6.251,12.279 13.251,12.279h133.029c7.347,0 13.303,-5.956 13.303,-13.303V245.847C455.549,238.499 449.593,232.543 442.246,232.543z"/>
</vector>

```

**build.gradle**

```
apply plugin: 'com.android.application'

android {
compileSdkVersion 26
defaultConfig {
    applicationId "com.atta"
    minSdkVersion 23
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:design:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

// retrofit, gson
implementation 'com.google.code.gson:gson:2.6.2'
implementation 'com.squareup.okhttp3:okhttp:3.8.0'
implementation 'com.squareup.retrofit2:retrofit:2.0.2'
implementation 'com.basgeekball:awesome-validation:4.1'
implementation 'com.squareup.retrofit2:converter-gson:2.0.2'
implementation 'com.squareup.okhttp3:logging-interceptor:3.8.0'
}

```

**Note: Each drawable is used only once.**

The following thread does not solve my problem:

[Drawable already belongs to another owner but does not expose a constant state](https://stackoverflow.com/questions/49620810/drawable-already-belongs-to-another-owner-but-does-not-expose-a-constant-state)

**Problem found: The following attribute is causing the exception:**

android:backgroundTint="#000"

If I don't use it, there is a pink background on the FAB :(