java - 将显式 Intent 从 ViewPagerAdapter 传递给 fragment

Question

我有一个带有两个选项卡的viewpager，每个选项卡都有一个 fragment 。我如何发送额外的 Intent 字符串来表示 FragmentMathematics()？这并不像使用 putExtra 创建 Intent 然后调用 strartActivity() 那样简单。

这是我的简单类(class)。

public class StartActivity extends AppCompatActivity {

private TabLayout tabLayout;
private ViewPager viewPager;
private String check;
private PagerAdapter adapter;

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

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

    tabLayout = (TabLayout) findViewById(R.id.tab_layout404);
    tabLayout.addTab(tabLayout.newTab().setText("Mathematics"));
    tabLayout.addTab(tabLayout.newTab().setText("Physics"));
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

    Intent intent = getIntent();
    check = intent.getStringExtra("SELECTVALUE");


    if("Mathematics".equalsIgnoreCase(check)){
        selectPage(1);
    } else {
        viewPager = (ViewPager) findViewById(R.id.pager);
        adapter = new PagerAdapter
                (getSupportFragmentManager(), tabLayout.getTabCount());
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    }

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

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

        }

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

        }
    });
}

void selectPage(int pageIndex){
    viewPager = (ViewPager) findViewById(R.id.pager);
    adapter = new PagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.setScrollPosition(pageIndex,0f,true);
    viewPager.setCurrentItem(pageIndex);
}

谢谢!

Answer 1

使用Bundle将数据传递给fragment。

Bundle bundle = new Bundle();
bundle.putString("edttext", "Your Value");
// set Fragmentclass Arguments
FragmentMathematics fragobj = new FragmentMathematics();
fragobj.setArguments(bundle);

并在 fragment OnCreate()中

@Override
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    String strtext = getArguments().getString("edttext");    

}