ProgramaticFragment

Programatically Creating a custom Fragment and added in Custom View Pager.

ArrayList<String> al = new ArrayList<String>();
private SectionsStatePagerAdapter mSectionStatePAgeAdapter;
private CustomViewPager mViewPager;
    
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mSectionStatePAgeAdapter = new SectionsStatePagerAdapter(getSupportFragmentManager());
    mViewPager =  findViewById(R.id.viewpager);


    addInList();
    containerTabs();





}


public void addInList(){
    al = new ArrayList<String>();
    al.add("TAB 1");
    al.add("TAB 2");
    al.add("TAB 3");
    al.add("TAB 4");
    al.add("TAB 5");
    al.add("TAB 6");
    al.add("TAB 7");

}


public void containerTabs(){
    SectionsStatePagerAdapter adapter = new SectionsStatePagerAdapter(getSupportFragmentManager());
    for (int i = 0; i < al.size(); i++) {

        LinearLayout ln = (LinearLayout) this.findViewById(R.id.buttonPanel);
        final Button btn = new Button(this);
        btn.setId(i);
        final int id_ = btn.getId();
        LinearLayout.LayoutParams btnParams = new LinearLayout.LayoutParams( 235 , 120);
        btnParams.setMargins(10, 0, 10, 0);
        btnParams.gravity = Gravity.CENTER;
        btn.setText(al.get(i).toString());
        btn.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
        btn.setGravity(Gravity.CENTER);
        btn.setTextColor(getResources().getColor(R.color.white));
        btn.setBackgroundResource(R.drawable.tab_button);

        if(i==0){
            btn.setTextColor(getResources().getColor(R.color.colorPrimaryDark));
            btn.setBackgroundResource(R.drawable.tab_button_selected);
        }else{
            btn.setTextColor(getResources().getColor(R.color.white));
            btn.setBackgroundResource(R.drawable.tab_button);
        }
        String fragmentTitle = al.get(i).toString();
        final int f = i;

        adapter.addFragment(new CustomFragment(), fragmentTitle);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Button b;
                for(int a=0; a<al.size(); a++ ){
                    b = findViewById(a);
                    b.setTextColor(getResources().getColor(R.color.white));
                    b.setBackgroundResource(R.drawable.tab_button);
                }
                btn.setTextColor(getResources().getColor(R.color.colorPrimaryDark));
                btn.setBackgroundResource(R.drawable.tab_button_selected);
                mViewPager.setCurrentItem(f, true);
            }
        });

        ln.addView(btn, btnParams);

    }
    mViewPager.setAdapter(adapter);
    mViewPager.setPagingEnabled(false);
}