package com.reactnativenavigation; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.view.View; import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler; public class NavigationActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler { private View contentView; @Override public void setContentView(View contentView) { super.setContentView(contentView); this.contentView = contentView; } @Nullable public View getContentView() { return contentView; } @Override public void invokeDefaultOnBackPressed() { onBackPressed(); } }