1-) Android RMOS - basit olan

// cancel yapamasın pd.setCancelable(false);

ProgressDialog pd ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    pd = new ProgressDialog(MainActivity.this) ;

}

public void progresCalistir() {
    if (!pd.isShowing()) {
        pd.setMessage("Yükleniyor...");
        pd.show();
    }
}
public void progresDurdur() {
    if (pd != null && pd.isShowing()) {
        pd.dismiss();
    }
}

...

...

public void depoEkle() {
    progresCalistir();
    depoInterface = ServiceGenerator.createService(depoInterface.class);
    depoListCall = depoInterface.GetDepoList(); // buraya cins adi gelecek
    depoListCall.enqueue(depoCallback);
}

Callback<List<depoRoot>> depoCallback = new Callback<List<depoRoot>>() {

public void onResponse(Call<List<depoRoot>> call, Response<List<depoRoot>> response) {

   progresDurdur();
}

@Override
public void onFailure(Call<List<depoRoot>> call, Throwable t) {
    Toast.makeText(MainActivity.this, "hata " + t.getMessage(), Toast.LENGTH_SHORT).show();
    progresDurdur();
}

2-) bu başka -> loading  ProgressBar yapma

kaynak : https://github.com/ybq/Android-SpinKit

ProgressBar progressBar;
Sprite Circles = new Circle();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    progressBar = findViewById(R.id.spin_kit);
    progressBar.setIndeterminateDrawable(Circles);

}

public void progres_ac() {
    progressBar.setVisibility(View.VISIBLE);

}

public void progres_kapat() {
    progressBar.setVisibility(View.GONE);
}

3-) style

4-) xml

<RelativeLayout
    android:id="@+id/loadingPanel"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <com.github.ybq.android.spinkit.SpinKitView xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/spin_kit"
        style="@style/SpinKitView.Large.Circle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        app:SpinKit_Color="@color/colorAccent" />
</RelativeLayout>