탭호스트 버튼 구현 로그캣 오류 없는 오류 문제

Question

public class HostActivity extends AppCompatActivity {
    Intent intent;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tab_activity);
        intent = getIntent();

        TabHost tabHost = findViewById(R.id.tabHost);

        tabHost.getTabWidget();
        tabHost.setup();

        TabHost.TabSpec tabSpec1=tabHost.newTabSpec("tab1").setIndicator("PC_VR").setContent(R.id.btn3);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn4);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn5);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn6);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn7);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn8);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn9);
        tabHost.newTabSpec("tab1").setIndicator("PC VR").setContent(R.id.btn10);
        tabHost.addTab(tabSpec1);

        TabHost.TabSpec tabSpec2= tabHost.newTabSpec("tab2").setIndicator("Mobile_VR").setContent(R.id.btn11);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn12);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn13);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn14);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn15);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn16);
        tabHost.newTabSpec("tab2").setIndicator("Mobile VR").setContent(R.id.btn17);
        tabHost.addTab(tabSpec2);

        tabHost.setCurrentTab(0);
    }
}

로그캣 오류는 없고 실행은 잘 되는데 탭은 보이고 버튼들만 안보이네요 뭐가 잘못된거죠?