Use Scrollview and tabhost to realize vertical scrollbars and tabs

1 Scroll bar

Scroll view ScrollView yes FrameLayout Subclasses of . By default, the scroll bar is not displayed , Show after dragging , The scroll bar disappears after you stop dragging .
Vertical scroll bar ：ScrollView
Horizontal scroll bar ：HorizontalScrollView
Add a scrolling view in two ways ：
1 xml Layout file

<ScrollView
    android:id="@id/scrollView"
    android:layout_width="match_parent"
  android:layout_height="wrap_parent" >
    <!--  Components to add scroll bars  -->
</ScrollView>

2 Code
(1)new ScrollView()
(2) Pass the components that need to add scroll bars addView() Add to scroll view
(3) Add a scrolling view to the layout manager

ScrollView： Realize vertical scroll bar
MainActivity.java

public class MainActivity extends AppCompatActivity {
    LinearLayout linearLayout, linearLayout2;
    ScrollView scrollView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        linearLayout = (LinearLayout) findViewById(R.id.ll);
        linearLayout2 = new LinearLayout(MainActivity.this);
        //  Set to portrait 
        linearLayout2.setOrientation(LinearLayout.VERTICAL);
        scrollView = new ScrollView(MainActivity.this);
        //  Add a scrolling view component to the default layout 
        linearLayout.addView(scrollView);
        //  Add a new layout to the scroll view component 
        scrollView.addView(linearLayout2);
        TextView textView = new TextView(MainActivity.this);
        textView.setText(R.string.cidian);
        //  Add... To the new layout TextView Components 
        linearLayout2.addView(textView);
    }
}

https://github.com/hanyuhang-hz/android-demos

2 tab

Tabs are used to implement a multi tab user interface . Use the tabs , Follow the following steps to achieve ：
(1) Add the required to implement the tab in the layout file TabHost,LinearLayout,TabWidget and FrameLayout.
(2) Write the for each tab xml Layout file .
(3) initialization TabHost Components .
(4) by TabHost Add tabs .

TabHost： Implementation tab
MainActivity.java

public class MainActivity extends AppCompatActivity {
    private TabHost tabHost;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tabHost = (TabHost) findViewById(android.R.id.tabhost);
        tabHost.setup();
        LayoutInflater inflater = LayoutInflater.from(this);
        inflater.inflate(R.layout.tab1, tabHost.getTabContentView());
        inflater.inflate(R.layout.tab2,tabHost.getTabContentView());
        //  Add the first tab 
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1")
                .setContent(R.id.linearlayout1));
        //  Add a second tab 
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2")
                .setContent(R.id.linearlayout2));
    }
}

GitHub - hanyuhang-hz/android-demos