安卓getActivity（）是未定义 [英] Android getActivity() is undefined

问题描述

我在我的课MainActivity存在错误。

错误： 的方法getActivity（）是未定义的类型MainActivity

 公共类MainActivity扩展SherlockFragmentActivity {
    PlaceSlidesFragmentAdapter mAdapter;
    ViewPager mPager;
    PageIndicator mIndicator;

    公共静态最终字符串变量=detailsFragment;

    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，
            捆绑savedInstanceState）{
        查看查看= inflater.inflate（R.layout.main，
                集装箱，假）;

        mAdapter =新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（真正的）;

        mIndicator
                .setOnPageChangeListener（新ViewPager.OnPageChangeListener（）{
                    @覆盖
                    公共无效onPageSelected（INT位置）{
                        Toast.makeText（MainActivity.this.getActivity（），
                                更改为网页+位置，
                                Toast.LENGTH_SHORT）.show（）;
                    }

                    @覆盖
                    公共无效onPageScrolled（INT位置，
                            浮positionOffset，INT positionOffsetPixels）{
                    }

                    @覆盖
                    公共无效onPageScrollStateChanged（INT状态）{
                    }
                }）;
        返回查看;
    }
}
 

解决方案

这是因为你使用 getActivity（）内部类中。请尝试使用：

SherlockFragmentActivity.this.getActivity（）

来代替，但真的没有必要在 getActivity（）部分。在你的情况， SherlockFragmentActivity。这就足够了。

I have errors in my class MainActivity.

The error: 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;
    }
}

解决方案

This is because you're using getActivity() inside an inner class. Try using:

SherlockFragmentActivity.this.getActivity()

instead, though there's really no need for the getActivity() part. In your case, SherlockFragmentActivity .this should suffice.

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