Question

我正在开发一个应用程序，我从服务器获取数据并在 MainActivity 中的 AsyncTask 中解析它然后我调用另一个名为 DetailsPage 的活动，其中包含片段。这是我如何调用并将参数传递给DetailsPage。这在AsyncTask中调用。

Intent myIntent = new Intent(MainActivity.this, DetailsPage.class);
                    myIntent.putExtra("adminId",adminId);
                    startActivity(myIntent);
                }

然后在DetailPage中我得到这些参数并将它放在包中，以便由DetailsPage运行片段。

public class DetailsPage extends FragmentActivity implements
        ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = {"Payments", "Goods" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details_page);
        /*Get Extra Values from the mainActivity*/
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String value = extras.getString("adminId");
            Bundle bundle=new Bundle();
            bundle.putString("adminId", value);
            PaymentsFragment payment_frag=new PaymentsFragment();
            payment_frag.setArguments(bundle);
        }
        // Initilization
        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        //actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);        

        // Adding Tabs
        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name)
                    .setTabListener(this));
        }

        /**
         * on swiping the viewpager make respective tab selected
         * */
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }

}

在PaymentsFragment中我试图从 oncreateView

中的字符串中获取字符串

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
/*Get Extras Passed by MainActivity*/
        adminId=getArguments().getString(adminId);
        View rootView = inflater.inflate(R.layout.fragment_payments, container, false);
        CustomListView = this;
        String serverURL = "http://ott.edgeaccounts.com/Webservices/GetPaymentService.php";
        new GetPayments().execute(serverURL);
        Resources res =getResources(); 
        list=(ListView)rootView.findViewById(R.id.list_payments);
        adapter=new CustomAdapter(CustomListView, CustomListViewValuesArr,res);
        list.setAdapter(adapter);

        return rootView;
    }

但它在此行中给出了空指针异常的 adminId = getArguments（）的getString（adminId）; 提前感谢您的帮助。

Answer 1

更改此

adminId=getArguments().getString(adminId);

到

adminId=getArguments().getString("adminId");

因为密钥是＆＃34; adminId＆＃34;

bundle.putString("adminId", value); // in quotes adminId

您可以参考

Send data from activity to fragment in android

将参数传递给ASyncTask中的片段

1 个答案: