当我转到另一个片段时片段重复

Question

实际上，这是我的主要问题。 我有一个NavigationDrawer并且正在对其进行很多更改。 因为我已经在其中添加了TabHostFragment 。 问题是当我在一个Fragment ，我有一个ActionBar图标转到另一个Fragment 。 当时这样做很完美。 但是当我转到另一个Fragment ，它仍然在新Fragment的背面。 我试图为每个Fragment设置BackGround颜色，但它不可见。

问题在于事务正常。 但是当我在另一个Fragment ，当我按BlankSpace （例如）时，在旧Fragment有一个带有Toast的按钮，它仍在新Fragment上显示此Toast 。

以下是一些有关图像可能发生的例子，您可以更好地理解我的问题：

当我通过毫无意义的“ Fragment （在MainActivity上称其为“ Fragment ）时，就会出现主要问题。 因为我想在特定Fragment上调用它; 但这是我可以称呼的唯一Fragment ...

这是MainActivity ，我称之为FragmentTransaction ：

case R.id.newOffer:
    android.app.FragmentManager fm = getFragmentManager();
    android.app.FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.frame_container, new TipusNouProducte());
    ft.commit();
    return true;

顺便说一句，我在这里将NavigationDrawer的代码留给您，这些代码总是在我遍历Fragment时说： “创建Fragment时出错” ：

private void displayView(int position) {
    mDrawerList.setItemChecked(position, true);
    mDrawerList.setSelection(position);
    setTitle(navMenuTitles[position]);
    mDrawerLayout.closeDrawer(mDrawerList);
    Fragment fragment = null;

    switch (position) {
        case 0:
            fragment = new TabHostFragment();
            break;
        case 1:
            fragment = new LocalizacionFragment();
            break;
        case 2:
            fragment = new ListaProductosFragment();
            break;
        case 3:
            fragment = new ConfiguracionFragment(this);
            break;
        case 4:
            fragment = new AyudaSugerenciasFragment();
            break;
        case 5:
            fragment = new AyudaSugerencias();
            break;
        case 6:
            finish();
            break;
        default:
            break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
            .replace(R.id.frame_container, fragment).commit(); 

        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    } else {
        // error in creating fragment
        Log.e("MainActivity", "Error in creating fragment");
    }
}

如果您需要更多代码，可能会导致此问题，请随时问我； 然后我将尽快更新。

TabHostFragment.xml

<android.support.v4.app.FragmentTabHost xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" />

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0" />

        <FrameLayout
            android:id="@+id/realtabcontent"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1" />
    </LinearLayout>

</android.support.v4.app.FragmentTabHost>

MainActivity代码如下所示：

public class MainActivity extends FragmentActivity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;
    // saber si esta abierto
    public boolean mDrawerOpened;
    // nav drawer title
    private CharSequence mDrawerTitle;
    private FragmentTabHost mTabHost;
    // used to store app title
    private CharSequence mTitle;

    //para ponerlo visible
    public MenuItem mi;

    // slide menu items
    private String[] navMenuTitles;
    private TypedArray navMenuIcons;

    private ArrayList<NavDrawerItem> navDrawerItems;
    private NavDrawerListAdapter adapter;

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

        mTitle = mDrawerTitle = getTitle();

        // load slide menu items
        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

        // nav drawer icons from resources
        navMenuIcons = getResources()
            .obtainTypedArray(R.array.nav_drawer_icons);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

        navDrawerItems = new ArrayList<NavDrawerItem>();

        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
        // Find People
        //navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
        // Photos
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
        // What's hot, We  will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
        //AyudaSugerencias
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));

        // Recycle the typed array
        navMenuIcons.recycle();

        mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

        // setting the nav drawer list adapter
        adapter = new NavDrawerListAdapter(getApplicationContext(),
            navDrawerItems);
        mDrawerList.setAdapter(adapter);

        // enabling action bar app icon and behaving it as toggle button
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setBackgroundDrawable(new ColorDrawable(0xff1d97dd));
        getActionBar().setHomeButtonEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer, //nav menu toggle icon
            R.string.app_name, // nav drawer open - description for accessibility
            R.string.app_name // nav drawer close - description for accessibility
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(
                    Html.fromHtml("<font color='ffffff'>"
                        + mTitle + "</font>"));

                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
                mDrawerOpened = false;
                syncState();

            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(
                    Html.fromHtml("<font color='ffffff'>"
                        + mDrawerTitle + "</font>"));

                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
                mDrawerOpened = true;
                syncState();
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            // on first time display view for first nav item
            displayView(0);
        }
    }

    /**
     * Slide menu item click listener
     */
    private class SlideMenuClickListener implements
        ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
            // display view for selected nav drawer item
            displayView(position);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Fragment fragment = null;
        // toggle nav drawer on selecting action bar app icon/title
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action bar actions click
        switch (item.getItemId()) {
            case R.id.action_settings:
                return true;
            case R.id.ofertasRefresh:
                return true;
            case R.id.menu_search:
                return true;
            case R.id.newOffer:
                android.app.FragmentManager fm = getFragmentManager();
                android.app.FragmentTransaction ft = fm.beginTransaction();
                ft.replace(R.id.frame_container, new TipusNouProducte());
                ft.commit();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    /* *
     * Called when invalidateOptionsMenu() is triggered
     */

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // if nav drawer is opened, hide the action items
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        if (mDrawerOpened) {
            menu.removeItem(R.id.ofertasRefresh);
            menu.removeItem(R.id.menu_search);
            menu.removeItem(R.id.newOffer);
        }
        if (!mDrawerOpened) {
            menu.add(Menu.NONE, R.id.ofertasRefresh, Menu.NONE, mTitle);
        }
        return super.onPrepareOptionsMenu(menu);
    }

    /**
     * Diplaying fragment view for selected nav drawer list item
     */
    private void displayView(int position) {
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
        Fragment fragment = null;

        switch (position) {
            case 0:
                fragment = new TabHostFragment();
                break;
            case 1:
                fragment = new LocalizacionFragment();
                break;
            case 2:
                fragment = new ListaProductosFragment();
                break;
            case 3:
                fragment = new ConfiguracionFragment(this);
                break;
            case 4:
                fragment = new AyudaSugerenciasFragment();
                break;
            case 5:
                fragment = new AyudaSugerencias();
                break;
            case 6:
                finish();
                break;
            default:
                break;
        }

        if (fragment != null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction()
                .replace(R.id.frame_container, fragment).commit();

            // update selected item and title, then close the drawer
            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(navMenuTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);
        } else {
            // error in creating fragment
            Log.e("MainActivity", "Error in creating fragment");
        }
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }
}

TabHostFragment看起来像：

public class TabHostFragment extends Fragment {
    // Declaring our tabs and the corresponding fragments.
    public TabHostFragment(){

    }
    private FragmentTabHost mTabHost;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tab_host_test2, container, false);
        mTabHost = (FragmentTabHost)rootView.findViewById(android.R.id.tabhost);
        mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.realtabcontent);

        mTabHost.addTab(mTabHost.newTabSpec("Mis ofertas").setIndicator("Mis ofertas"),
            MisOfertasFragment.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("Mis recomendaciones").setIndicator("Mis recomendaciones"),
            RecomendacionesFragment.class, null);

        return rootView;
    }
}

Answer 1

我不确定这是造成您问题的原因，但绝对有问题的一件事是使用本机 FragmentManager而不是支持库中的那个。

在您的代码中，替换

case R.id.newOffer:
    android.app.FragmentManager fm = getFragmentManager();
    android.app.FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.frame_container, new TipusNouProducte());
    ft.commit();
    return true;

同

case R.id.newOffer:
    android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
    android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.frame_container, new TipusNouProducte());
    ft.commit();
    return true;

您已经在代码的其他地方使用了支持库的 FragmentManager ，因此您应该继续在各处使用它。

另外， TipusNouProducte应该扩展android.support.v4.app.Fragment而不是 android.app.Fragment 。

如果发现更多问题，我将更新此答案。