Android getActivity()未定义

Question

我的班级MainActivity中有错误.

错误: The method getActivity() is undefined for the type MainActivity

public class MainActivity extends SherlockFragmentActivity{
    PlaceSlidesFragmentAdapter mAdapter;
    ViewPager mPager;
    PageIndicator mIndicator;

    public static final String TAG = "detailsFragment";

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.main,
                container, false);

        mAdapter = new PlaceSlidesFragmentAdapter(getActivity()
                .getSupportFragmentManager());

        mPager = (ViewPager) view.findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        mIndicator = (CirclePageIndicator) view.findViewById(R.id.indicator);
        mIndicator.setViewPager(mPager);
        ((CirclePageIndicator) mIndicator).setSnap(true);

        mIndicator
                .setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                    @Override
                    public void onPageSelected(int position) {
                        Toast.makeText(MainActivity.this.getActivity(),
                                "Changed to page " + position,
                                Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onPageScrolled(int position,
                            float positionOffset, int positionOffsetPixels) {
                    }

                    @Override
                    public void onPageScrollStateChanged(int state) {
                    }
                });
        return view;
    }
}

Answer 1

这是因为你在getActivity()内部类中使用.尝试使用:

SherlockFragmentActivity.this.getActivity()

相反,虽然这getActivity()部分真的没有必要.在你的情况下, SherlockFragmentActivity .this应该足够了.

Answer 2

如果您想呼叫您的活动,请使用此功能.当您在片段内时,可以使用getActivity方法.

Answer 3

你想要getActivity()在课堂上.最好使用

yourclassname.this.getActivity()

试试这个.它对你有帮助.