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public class MainActivity extends AppCompatActivity {

    AnimationDrawable animationDrawable;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ImageView imageView = (ImageView)findViewById(R.id.image_wifi);
        imageView.setBackgroundResource(R.drawable.animation);
        animationDrawable =(AnimationDrawable)imageView.getBackground();


    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        animationDrawable.start();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
    android:drawable="@drawable/ic_signal_wifi_1"
    android:duration="400"/>
    <item
        android:drawable="@drawable/ic_signal_wifi_2"
        android:duration="400"/>
    <item
        android:drawable="@drawable/ic_signal_wifi_3"
        android:duration="400"/>
    <item
        android:drawable="@drawable/ic_signal_wifi_4"
        android:duration="400"/>
    <item
        android:drawable="@drawable/ic_signal_wifi_5"
        android:duration="400"/>


</animation-list>

<!--
Add five wifi Vector same below 
-->

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M12.01,21.49L23.64,7c-0.45,-0.34 -4.93,-4 -11.64,-4C5.28,3 0.81,6.66 0.36,7l11.63,14.49 0.01,0.01 0.01,-0.01z"
        android:fillAlpha=".3"/>
</vector>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/image_wifi"
        android:layout_width="50dp"
        android:layout_height="50dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>