当按下返回按钮时重新启动碎片类

Question

当按下返回按钮时重新启动碎片类

8

我有一个片段是选项卡视图的一部分。我想在按下返回按钮时重新启动此片段，但我不知道如何刷新它。我尝试了一些类似这样的代码： Restart fragment inside activity 但它没有起作用。

这里是检测后退按钮的代码：

    @Override
public void onResume() {

    super.onResume();

    getView().setFocusableInTouchMode(true);
    getView().requestFocus();
    getView().setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {

            if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK){

                // handle back button




                return true;

            }

            return false;
        }
    });
}

这里有一个碎片类（Fragment Class）的按钮：

public class MoviesFragment extends Fragment {

  static ListView list;


static String[] numbers_text = new String[] { "one", "two", "three", "four",
        "five", "six", "seven", "eight", "nine", "ten", "eleven",
        "twelve", "thirteen", "fourteen", "fifteen" };
String[] songs = new String[] { "1", "2", "3", "4", "5", "6", "7",
        "8", "9", "10", "11", "12", "13", "14", "15" };



MainCustomList adapter;




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



    View view = inflater.inflate(R.layout.fragment_movies, container, false);

    adapter = new MainCustomList(this.getActivity(), numbers_text);
         list=(ListView) view.findViewById(R.id.list);
         list.setAdapter(adapter);


         return view;
}

主函数：

public class MainActivity extends FragmentActivity implements
    ActionBar.TabListener {

private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "Top Rated", "Games", "Movies" };

@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) {
}

 }

- user5508330

你的TabLayout有多少个片段，你试图刷新的片段位置是什么？ - Mohammed Aouf Zouag

1

我有三个标签页，它是第三个。 - user5508330

检查一下我的解决方案，看看它是否适用于你。（你是否正在使用支持库？） - Mohammed Aouf Zouag

对于 Android SDK >= 21，您可以查看我的答案：如何从活动重新启动片段 - Emir Vildanov

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Mohammed Aouf Zouag · Accepted Answer

使用此代码：

YourFragmentClass fragment = (YourFragmentClass) 
getFragmentManager().findFragmentById(R.id.your_fragment_container_id)

getFragmentManager().beginTransaction()
                    .detach(fragment)
                    .attach(fragment)
                    .commit();

& 这将导致您的片段的OnCreateView方法再次被调用并刷新其布局。

更新：

使用Support Library时，您可以通过以下方式访问您的片段：

int YOUR_FRAGMENT_POSITION = 2; // in your case you wanna access the 3rd fragment, 0 indexed

YourFragmentClass fragment = (YourFragmentClass) getSupportFragmentManager().getFragments().get(YOUR_FRAGMENT_POSITION);

使用上面相同的代码片段：

getSupportFragmentManager().beginTransaction()
                        .detach(fragment)
                        .attach(fragment)
                        .commit();

如果您尝试通过PagerAdapter访问fragment，可能会遇到IllegalStateException，告诉您该fragment未能保存其state。