Question

我想从空活动切换到选项卡式布局活动。我使用了意图，但它不起作用，应用程序不断崩溃。我在我的主要活动中使用了一个按钮，我想跳转到名为选项卡式活动的LeaderBoards。怎么做？

主要活动中的此按钮：

submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            Intent intent=new Intent(game4x4.this, LeaderBoards.class);//game4x4 is the main activity
                startActivity(intent);
            }
        });

选项卡式活动类：

public class LeaderBoards extends AppCompatActivity {

    TabLayout tabLayout;
    ViewPager viewPager;
    int page=1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_leader_boards);

        viewPager=(ViewPager)findViewById(R.id.viewpager);
        viewPager.setAdapter(new CustomAdapter(getSupportFragmentManager(),getApplicationContext()));
        viewPager.setCurrentItem(page);

        tabLayout=(TabLayout)findViewById(R.id.tablayout);
        tabLayout.setupWithViewPager(viewPager);



        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener()
        {
            @Override
            public void onTabSelected(TabLayout.Tab Tab)
            {
            viewPager.setCurrentItem(Tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab Tab)
            {
                viewPager.setCurrentItem(Tab.getPosition());
            }

            @Override
            public void onTabReselected(TabLayout.Tab Tab)
            {
                viewPager.setCurrentItem(Tab.getPosition());
            }
        });
    }

    private class CustomAdapter extends FragmentPagerAdapter
    {
        private String fragments[]= {"MyScore","TopScores"};
        public CustomAdapter(FragmentManager supportFragmentManager, Context applicationContext)
        {
            super(supportFragmentManager);

        }

        @Override
        public Fragment getItem(int position) {
            switch (position)
            {
                case 0:
                    return new Fragment1();
                case 1:
                    return new Fragment2();
                default:
                    return null;

            }
        }

        @Override
        public int getCount() {
            return fragments.length;
        }

        @Override
        public CharSequence getPageTitle(int position)
        {
            return fragments[position];

        }


    }

}

Fragemt1和Fragment2是不同标签的类。

Answer 1

尝试这种方式

  viewPager=(ViewPager)findViewById(R.id.viewpager);

  tabLayout=(TabLayout)findViewById(R.id.tablayout);

  tabLayout.setupWithViewPager(viewPager);

  viewPager.setAdapter(new CustomAdapter(getSupportFragmentManager(),getApplicationContext()));
  viewPager.setCurrentItem(page);

Answer 2

检查＆＃34; LeaderBoards＆＃34;是否在清单中提及。

从另一个活动访问Tab布局

2 个答案: