java - 安卓开发 : Directing to specific tabs in fragment

Question

这就是 Main Activity 的方式好像。通过单击主要 Activity 中的每个卡片 View ，我将转到 Activity two它包含带有滑动选项卡布局和 recyclerview 的 fragment 。我遇到的问题是试图将每个 cardview 定向到第二个 Activity 中它自己的特定选项卡，而不是第一个默认选项卡。我尝试在网上查看解决方案，但没有太大帮助。任何形式的帮助将不胜感激，提前致谢。

澄清一下，从第一个主要 Activity 到第二个 Activity 的 Intent 调用是通过适配器完成的。

这是主要 Activity

public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private CoverAdapter adapter;
private List<Covers>    coversList;

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    initCollapsingToolbar();

    recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

    coversList = new ArrayList<>();
    adapter = new CoverAdapter(this, coversList);

    RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2);
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.addItemDecoration(new GridSpacingItemDecoration(2, dpToPx(10), true));
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.setAdapter(adapter);

    prepareCovers();

    try {
        Glide.with(this).load(R.drawable.cover).into((ImageView) findViewById(R.id.backdrop));
    } catch (Exception e) {
        e.printStackTrace();
    }


}

private void prepareCovers() {
    int[] covers = new int[]{
            R.drawable.school};
    Covers academiaCover = new Covers("Universities",covers[0]);
    coversList.add(academiaCover);

    academiaCover = new Covers("Colleges", covers[0]);
    coversList.add(academiaCover);

    academiaCover = new Covers("School", covers[0]);
    coversList.add(academiaCover);

    academiaCover = new Covers("Others", covers[0]);
    coversList.add(academiaCover);

    adapter.notifyDataSetChanged();


}

private void initCollapsingToolbar() {
    final CollapsingToolbarLayout collapsingToolbar =
            (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
    collapsingToolbar.setTitle(" ");
    AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.appbar);
    appBarLayout.setExpanded(true);

    // hiding & showing the title when toolbar expanded & collapsed
    appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
        boolean isShow = false;
        int scrollRange = -1;

        @Override
        public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
            if (scrollRange == -1) {
                scrollRange = appBarLayout.getTotalScrollRange();
            }
            if (scrollRange + verticalOffset == 0) {
                collapsingToolbar.setTitle(getString(R.string.app_name));
                isShow = true;
            } else if (isShow) {
                collapsingToolbar.setTitle(" ");
                isShow = false;
            }
        }
    });
}

这是第二个 Activity

public class ActivityTwo extends AppCompatActivity {

private Toolbar toolbar;
private ViewPager mPager;
private SlidingTabLayout mTabs;
private static  final int UNIVERSITES   = 0;
private static  final int COLLEGES      = 1;
private static  final int SCHOOLS       = 2;
private static  final int OTHERS        = 3;
public static ProgressBar       spinner;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_two);
    toolbar = (Toolbar) findViewById(R.id.tool_bar);
    setSupportActionBar(toolbar);                 // Setting toolbar as the ActionBar with setSupportActionBar() call
    getSupportActionBar().setHomeButtonEnabled(true);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    toolbar.setTitleTextColor(Color.WHITE);
    mPager = (ViewPager) findViewById(R.id.pager);
    mPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
    mTabs = (SlidingTabLayout) findViewById(R.id.tabs);
    mTabs.setViewPager(mPager);

    spinner = (ProgressBar)findViewById(R.id.progress_bar);
    spinner.setVisibility(View.GONE);


}

class MyPagerAdapter extends FragmentPagerAdapter {
    String[] tabs;
    public MyPagerAdapter(FragmentManager fm) {
        super(fm);
        tabs=getResources().getStringArray(R.array.tabs);
    }

    @Override
    public Fragment getItem(int position) {
        Fragment myFragment = null;

        switch (position){
            case UNIVERSITES:
                myFragment = FragmentUniversities.newInstance("","");
                break;

            case COLLEGES:
                myFragment = FragmentColleges.newInstance("","");
                break;

            case SCHOOLS:
                myFragment = FragmentSchool.newInstance("","");
                break;
            case OTHERS:
                myFragment = FragmentOthers.newInstance("","");
                break;

        }

        return myFragment;

    }

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

    @Override
    public int getCount() {
        return 4;
    }
}

Answer 1

在您的 Intent 中手动发送数据，您希望在哪个选项卡位置显示如下:

   Intent intent=new Intent(YOUR_ACTIVITY_CONTEXT,ActivityTwo.class);
   //give whichever position you want to set for ex: 0 for clicking universities or 1 for clicking colleges and so on.
   intent.putExtra("position",1);
   YOUR_ACTIVITY_CONTEXT.startActivity(intent);

在你的 ActivityTwo 中:

   mPager.setCurrentItem(getIntent().getIntExtra("position",0));

添加以下行以获取各个选项卡的页面:

  mTabs.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            mPager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });