android - fragment 中带有选项卡的抽屉导航

Question

我正在制作一个安卓应用程序。我正在使用抽屉导航，我使用抽屉导航膨胀的一些 fragment 包含选项卡布局，有些是带有 textview 的普通 fragment 。

我面临 2 个问题，当

1. 我正在打开带有选项卡的抽屉导航项目，之后它会自动将这些选项卡保留在 View 中，即使对于没有选项卡的 fragment 也是如此。

2. 当我第二次或多次打开带有标签的 fragment 时。它复制了标签。我的意思是，如果第一次没有标签是 3 那么下次我打开 fragment 时没有。标签数量翻倍。

带抽屉导航的 Activity

public class MainFeedActivity extends FragmentActivity {

public DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mDrawertitles;
LinearLayout drawerll;
String username;
TextView t;

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

    username = getIntent().getExtras().getString("username").toString();

    t = (TextView) findViewById(R.id.drawer_uname_tv);
    t.setText(username);

    mTitle = mDrawerTitle = getTitle();
    mDrawertitles = getResources().getStringArray(R.array.array);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);
    drawerll = (LinearLayout) findViewById(R.id.drawerll);

    // set a custom shadow that overlays the main content when the drawer
    // opens
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
            GravityCompat.START);
    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
            R.layout.drawer_list_item, mDrawertitles));
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    getActionBar().setDisplayHomeAsUpEnabled(true);

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer, R.string.drawer_open,
            R.string.drawer_close) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu(); // creates call to
                                        // onPrepareOptionsMenu()
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu(); // creates call to
                                        // onPrepareOptionsMenu()
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        selectItem(2);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // The action bar home/up action should open or close the drawer.
    // ActionBarDrawerToggle will take care of this.
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return true;

}

private class DrawerItemClickListener implements
        ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {

        selectItem(position);
    }
}

private void selectItem(int position) {

    if (position == 0) {

        Fragment fragment = new Home();

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.content_frame, fragment).commit();
        mDrawerList.setItemChecked(position, true);
        mDrawerLayout.closeDrawer(drawerll);
    }

    else if (position == 1) {

        Fragment fragment = new Statistics();

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.content_frame, fragment).commit();

        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerLayout.closeDrawer(drawerll);

    } else {
        Fragment fragment = new Help();

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.content_frame, fragment).commit();

        // update selected item and title, then close the drawer
        mDrawerLayout.closeDrawer(drawerll);

    }
}

/*
 * 
 * protected boolean isOnline() { ConnectivityManager cm =
 * (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
 * NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null &&
 * netInfo.isConnectedOrConnecting()) { return true; } else { return false;
 * } }
 */

@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);
    mDrawerToggle.onConfigurationChanged(newConfig);
}

/**
 * Fragment that appears in the "content_frame", shows a planet
 */

fragment

  public class Home extends Fragment {

ActionBar.Tab Tab1, Tab2, Tab3;
Fragment fragmentTab1 = new Connected();
Fragment fragmentTab2 = new Disconnected();
Fragment fragmentTab3 = new AllDevices();

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

    View view = inflater.inflate(R.layout.fragment_tabs, container, false);
    ActionBar actionBar = getActivity().getActionBar();

    actionBar.setDisplayShowHomeEnabled(true);

    // Hide Actionbar Title
    actionBar.setDisplayShowTitleEnabled(true);

    // Create Actionbar Tabs
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    Tab1 = actionBar.newTab().setText("Tab1");
    Tab2 = actionBar.newTab().setText("Tab2");
    Tab3 = actionBar.newTab().setText("Tab3");

    Tab1.setTabListener(new TabListener(fragmentTab1));
    Tab2.setTabListener(new TabListener(fragmentTab2));
    Tab3.setTabListener(new TabListener(fragmentTab3));

    actionBar.addTab(Tab1);
    actionBar.addTab(Tab2);
    actionBar.addTab(Tab3);

    return view;
}

fragment :

public class Help  extends Fragment {


Button b;

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

    setHasOptionsMenu(false);
        return rootView;
}

Answer 1

我得到了我的问题的解决方案:

1. 在 denvercoder9 的帮助下解决了第一个问题

当 position!= 1 时，您需要更改 actionBar 导航模式.... Android ActionBar: show/hide tabs dynamically? – denvercoder9

1. 第二个问题的解决方案是我需要用这个

ActionBar actionBar = getActivity().getActionBar();

    actionBar.removeAllTabs();

    actionBar.setDisplayShowHomeEnabled(true);

    actionBar.setDisplayShowTitleEnabled(true);

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

在 Home.java 类中

这解决了选项卡重复的问题。

感谢 Stackoverflow 帮助我 :)