Tab example with progress bar

Layout file:

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <FrameLayout android:id="@android:id/tabcontent"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <ProgressBar
                android:id="@+id/progressBar"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
            <Button android:id="@+id/button"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:text="Click me button"
                />
        </FrameLayout>
    </LinearLayout>

</TabHost>

Activity class

public class MainActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle state) {
        super.onCreate(state);
        setContentView(R.layout.activity_main);

        TabHost tabs=(TabHost)findViewById(R.id.tabhost);

        tabs.setup();

        TabHost.TabSpec spec=tabs.newTabSpec("tag1");

        spec.setContent(R.id.progressBar);
        spec.setIndicator("Tab1");
        tabs.addTab(spec);

        ProgressBar bar = findViewById(R.id.progressBar);
        bar.setProgress(25);

        spec=tabs.newTabSpec("tag2");
        spec.setContent(R.id.button);
        spec.setIndicator("Tab2");
        tabs.addTab(spec);
    }
}