Question

我有MainActivity和HomeTabs有三个标签（A B C），我在tab C上设置了刷新。

我的结构是当我在标签C上触发onRefresh时，我会切换到MainActivity 并再次加载数据以显示HomeTabs。

我的问题是当我点击finish();时，布局会显示tab C。

我尝试完成Fragment使用，如： getActivity().getSupportFragmentManager().beginTransaction().remove(this).commit(); 要么 ((MainActivity)getActivity()).removeFragment(getActivity());

这两个都没有用，当我点击回来时，我仍然无法立即完成应用。

有人可以告诉我我错过了哪一步，我将不胜感激。

我的HomeTabs扩展Fragment使用ViewPager和TabLayout添加三个标签

MainActivity：

public class MainActivity extends AppCompatActivity {

    private FrameLayout frameLayout;
    private Toolbar toolBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
frameLayout = (FrameLayout) findViewById(R.id.frameLayout);
        // Load the main Fragment
        if (savedInstanceState == null) {
            switchFragment(HomeTabs.newInstance());
        }
        //take the onRefresh data，send data to HomeTabs and open tab C
        if (getIntent().hasExtra("refresh")) {
            boolean isRefresh = getIntent().getExtras().getBoolean("refresh");
            if (isRefresh) {

                Bundle bundle = new Bundle();
                bundle.putBoolean("refresh", isRefresh);
                HomeTabs homeTabs = new HomeTabs();
                homeTabs.setArguments(bundle);
                switchFragment(homeTabs);
            }
        }
    }

    public void switchFragment(Fragment fragment) {
        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction transaction = manager.beginTransaction();
        transaction.replace(R.id.frameLayout, fragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }
    // I try to finsh my tab C , it's no working
    public void removeFragment(Activity activity) {
        activity.onBackPressed();
    }
@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            new DialogHandler(this).quickDialog(
                    getResources().getString(R.string.quick),
                    getResources().getString(R.string.confirm),
                    getResources().getString(R.string.cancel),
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // If i onRefrsh three times , i will finsh three times... here is my issue.
                            finish();
                        }
                    }, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });
        }
        return super.onKeyDown(keyCode, event);
    }
}

这是我的标签C片段刷新回调方法：

public class MyLineChart extends Fragment implements SwipeRefreshLayout.OnRefreshListener{

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

        //.....................

        return view;
    }
       @Override
        public void onRefresh() {
            refreshLayout.setRefreshing(false);
            // Both of them are no working.
            //((MainActivity)getActivity()).removeFragment(getActivity());
            //getActivity().getSupportFragmentManager().beginTransaction().remove(this).commit();
            Intent intent = new Intent(getActivity(),MainActivity.class);
            intent.putExtra("refresh", true);
            startActivity(intent);
        }

最后，我的HomeTabs片段采用日期并显示标签C：

Bundle bundle = getArguments();
    if (bundle != null) {
        boolean isRefresh = bundle.getBoolean("refresh");
        if (isRefresh) {
            //tab C position is 2
            tabLayout.getTabAt(2).select();
        }
    }

Answer 1

您可以在片段中添加一个可以触发父活动中的函数的侦听器这意味着你需要在fragmentC代码中添加一个接口

public class MyLineChart extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
    private MyLineChartListener fragmentListener;

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

        //.....................

        return view;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        if (context instanceof MyLineChartListener) {
            fragmentListener = (MyLineChartListener) context;
        } else {
            // throw an error
        }

    }

    @Override
    public void onRefresh() {
        refreshLayout.setRefreshing(false);
        // Both of them are no working.
        //((MainActivity)getActivity()).removeFragment(getActivity());
        //getActivity().getSupportFragmentManager().beginTransaction().remove(this).commit();
        fragmentListener.onSettingRefresh();
    }

    public interface MyLineChartListener {
        void onSettingRefresh();
    }
}

然后你需要在MainActivity代码中实现如下的监听器

public class MainActivity extends AppCompatActivity implements MyLineChart.MyLineChartListener {

    private FrameLayout frameLayout;
    private Toolbar toolBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        frameLayout = (FrameLayout) findViewById(R.id.frameLayout);
        // Load the main Fragment
        if (savedInstanceState == null) {
            switchFragment(HomeTabs.newInstance());
        }

    }

    public void switchFragment(Fragment fragment) {
        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction transaction = manager.beginTransaction();
        transaction.replace(R.id.frameLayout, fragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }

    // I try to finsh my tab C , it's no working
    public void removeFragment(Activity activity) {
        activity.onBackPressed();
    }

    // this function will be called when the fragment is refreshed
    @Override
    public void onSettingRefresh() {
        Bundle bundle = new Bundle();
        bundle.putBoolean("refresh", true);
        HomeTabs homeTabs = new HomeTabs();
        homeTabs.setArguments(bundle);
        switchFragment(homeTabs);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            new DialogHandler(this).quickDialog(
                    getResources().getString(R.string.quick),
                    getResources().getString(R.string.confirm),
                    getResources().getString(R.string.cancel),
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // If i onRefrsh three times , i will finsh three times... here is my issue.
                            finish();
                        }
                    }, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });
        }
        return super.onKeyDown(keyCode, event);
    }
}

Answer 2

尝试此解决方案，在Refresh点击时再次启动活动时添加以下代码： -

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);

或

更新您的MainActivity.java

1）在MainActivity中添加功能

public void refreshFragment() { Bundle bundle = new Bundle(); bundle.putBoolean("refresh", isRefresh); HomeTabs homeTabs = new HomeTabs(); homeTabs.setArguments(bundle); switchFragment(homeTabs); }

现在从Fragment Tab C调用，只需替换startActivity（refresh）代码：

MainActivity mainActivity = (MainActivity) getActivity(); mainActivity.refreshFragment();

我怎样才能完成TabLayout的片段？

2 个答案: