tabHost.setup() gives null pointer exception (Android studio)

Question

I have a very simple app which is just an activity with a tab view on it.

I have initialised and casted everything to as it should be but am continually getting a nu

Answer 1

This my code to use TabHost,but now I use fragment instead.

public class MainActivity extends TabActivity {
private TabHost tabHost;
private TabHost.TabSpec spec;
@SuppressWarnings("unused")
private Resources res;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.main_new);
    //Test Button
    Button testBtn = (Button)findViewById(R.id.title_imagebtn);
    testBtn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            dialog();
        }
    });


    this.res = getResources();
    this.tabHost = getTabHost();

    Intent intent = new Intent().setClass(this, LearnResActivity.class);
    this.spec = this.tabHost
            .newTabSpec(getString(R.string.res_learn))
            .setIndicator(
                    getString(R.string.res_learn),
                    getResources().getDrawable(
                            android.R.drawable.ic_media_play))
            .setContent(intent);
    this.tabHost.addTab(this.spec);

    this.tabHost = getTabHost();

    intent = new Intent().setClass(this, MyLearnActivity.class);
    this.spec = this.tabHost
            .newTabSpec(getResources().getString(R.string.my_learn))
            .setIndicator(
                    getString(R.string.my_learn),
                    getResources().getDrawable(
                            android.R.drawable.ic_menu_recent_history))
            .setContent(intent);
    this.tabHost.addTab(this.spec);
    this.tabHost = getTabHost();

    intent = new Intent().setClass(this, MyTestActivity.class);
    this.spec = this.tabHost
            .newTabSpec(getString(R.string.my_test))
            .setIndicator(
                    getString(R.string.my_test),
                    getResources().getDrawable(
                            android.R.drawable.ic_menu_edit))
            .setContent(intent);
    this.tabHost.addTab(this.spec);
}}