Java Android-searchview中出现空指针异常

我在片段内部使用了一个searchview，得到了一个nullpointerexception

我不明白为什么，我只是想问一下

我使用了一个3个标签片段，启动时应用程序崩溃

MainActivity.java

 public class MainActivity extends FragmentActivity implements
        ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = { "Search", "Top", "Download", "Library" };

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

        // 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) {
    }
 }

SearchFragment.java

 public class SearchFragment extends Fragment {

    private SearchView searchView1;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_search, container, false);

        searchView1 = (SearchView) getActivity().findViewById(R.id.searchView1);

        final SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextChange(String newText) {
                // Do something
                return true;
            }

            @Override
            public boolean onQueryTextSubmit(String query) {
                // Do something
                performSearch();
                return true;
            }
        };

        searchView1.setOnQueryTextListener(queryTextListener);

        return rootView;
    }

    public void performSearch(){
        Toast.makeText(getActivity(), "search performer", Toast.LENGTH_SHORT).show();
    }
 }

fragment_search.xml

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你能告诉我我做错了什么，我怎样才能成功吗？

你应该在片段视图中查找搜索视图，而不是在活动视图中

改变

searchView1 = (SearchView) getActivity().findViewById(R.id.searchView1);

到

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请在你的logcat中发布带有错误的logcat，它应该告诉你是哪一行导致了错误，然后告诉我们是哪一行。你知道如果你把它作为一个菜单项，为什么它会在一个片段中显示为空错误吗这是一个问题的链接

searchView1 = (SearchView) rootView.findViewById(R.id.searchView1);