android – Slider Menu片段中的可交换选项卡

我已经通过引用 this tutorial实现了导航抽屉,现在我想要做的是在片段内显示滑动标签.即当我点击导航抽屉中的一个项目时,让我们说第一个项目,它应显示该项目的滑动标签.(我的列表视图中有6个片段.(同样： – A,B,C,D,E,F).我在A Fragment上需要3个可交换的标签.)

如果item1是Events,当我点击它时,它应该显示滑动标签.

但我面临以下问题： –

>如何在片段内实现视图寻呼机？
>片段可能会扩展片段.
>当一个片段正在扩展FragmentActivity时,那么在我的主要活动中,代码显示错误,说“类型不匹配”,无法从A Fragment转换为片段.

这是我的Deep.java文件

package com.amar.demo;

import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;

import java.util.ArrayList;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

public class Deep extends Activity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    // nav drawer title
    private CharSequence mDrawerTitle;

    // used to store app title
    private CharSequence mTitle;

    // 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.deep);

        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[2],navMenuIcons
                .getResourceId(2,-1)));
        // Communities,Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3],navMenuIcons
                .getResourceId(3,-1),true,"22"));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4],navMenuIcons
                .getResourceId(4,-1)));
        // What's hot,We will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5],navMenuIcons
                .getResourceId(5,"50+"));

        // 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().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(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
            }
        };
        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.testmenu,menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // 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.a_More:
            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.a_More).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    /**
     * Diplaying fragment view for selected nav drawer list item
     * */
    private void displayView(int position) {
        // update the main content by replacing fragments
        Fragment fragment = null;
        switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment = new FindPeopleFragment();
            break;
        case 2:
            fragment = new PhotosFragment();
            break;
        case 3:
            fragment = new CommunityFragment();
            break;
        case 4:
            fragment = new PagesFragment();
            break;
        case 5:
            fragment = new WhatsHotFragment();
            break;

        default:
            break;
        }

        if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            // 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);
    }

}

在这段代码中,我遇到了案例0中的问题.

这是我的HomeFragment代码： –
包com.amar.demo;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.amar.demo.adapter.TabsPagerAdapter;

public class HomeFragment extends FragmentActivity implements
        ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = { "My Restaurant","Offers","Search & Book","News & Updates" };

    public HomeFragment() {
    }

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

        View rootView = inflater.inflate(R.layout.fragment_home,container,false);
        // code of tabes
        viewPager = (ViewPager) rootView.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) {
            }
        });
        return rootView;
    }

    @Override
    public void onTabSelected(Tab tab,FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabUnselected(Tab tab,FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabReselected(Tab tab,FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }
}

这是我的deep.xml代码： –

<!-- Framelayout to display Fragments -->

    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->

    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/list_background"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector" />

</android.support.v4.widget.DrawerLayout>

这是我的homefragment.xml代码： –

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>

解决方法

您必须使用包含ViewPager的自定义布局创建片段.

按照以下步骤操作,它将指导整个过程.

1.创建表示ViewPager的布局,将其命名为fragment_main.xml

<TabHost
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

        <TabWidget
            android:id="@android:id/tabs"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"/>

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

        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>

    </LinearLayout>
</TabHost>

2.创建一个片段来保存在上面的XML上声明的ViewPager,将其命名为MyFragment.java

如您所见,我们声明TabHost是ViewPager以及上面XML中声明的其他元素.同样在这个片段中,我们膨胀之前创建的布局,以及TabAdapter来处理所有选项卡.

import android.content.Context;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabWidget;

import java.util.ArrayList;

public static class MyFragment extends Fragment
{

    private TabHost mTabHost;
    private ViewPager mViewPager;
    private TabsAdapter mTabsAdapter;

    public MyFragment() {
    }

    @Override
    public void onCreate(Bundle instance)
    {
        super.onCreate(instance);

    }

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_main,false);

        mTabHost = (TabHost) v.findViewById(android.R.id.tabhost);
        mTabHost.setup();

        mViewPager = (ViewPager) v.findViewById(R.id.pager);
        mTabsAdapter = new TabsAdapter(getActivity(),mTabHost,mViewPager);

        // Here we load the content for each tab. 
        mTabsAdapter.addTab(mTabHost.newTabSpec("one").setIndicator("One"),PageOneFragment.class,null);
        mTabsAdapter.addTab(mTabHost.newTabSpec("two").setIndicator("Two"),PageTwoFragment.class,null);

        return v;
    }

    public static class TabsAdapter extends FragmentPagerAdapter implements TabHost.OnTabChangeListener,ViewPager.OnPageChangeListener
    {
        private final Context mContext;
        private final TabHost mTabHost;
        private final ViewPager mViewPager;
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

        static final class TabInfo
        {
            private final String tag;
            private final Class<?> clss;
            private final Bundle args;

            TabInfo(String _tag,Class<?> _class,Bundle _args)
            {
                tag = _tag;
                clss = _class;
                args = _args;
            }
        }

        static class DummyTabFactory implements TabHost.TabContentFactory
        {
            private final Context mContext;

            public DummyTabFactory(Context context)
            {
                mContext = context;
            }

            public View createTabContent(String tag)
            {
                View v = new View(mContext);
                v.setMinimumWidth(0);
                v.setMinimumHeight(0);
                return v;
            }
        }

        public TabsAdapter(FragmentActivity activity,TabHost tabHost,ViewPager pager)
        {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mTabHost = tabHost;
            mViewPager = pager;
            mTabHost.setOnTabChangedListener(this);
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);
        }

        public void addTab(TabHost.TabSpec tabSpec,Class<?> clss,Bundle args)
        {
            tabSpec.setContent(new DummyTabFactory(mContext));
            String tag = tabSpec.getTag();

            TabInfo info = new TabInfo(tag,clss,args);
            mTabs.add(info);
            mTabHost.addTab(tabSpec);
            notifyDataSetChanged();
        }

        @Override
        public int getCount()
        {
            return mTabs.size();
        }

        @Override
        public Fragment getItem(int position)
        {
            TabInfo info = mTabs.get(position);

            return Fragment.instantiate(mContext,info.clss.getName(),info.args);

        }

        public void onTabChanged(String tabId)
        {
            int position = mTabHost.getCurrentTab();
            mViewPager.setCurrentItem(position);
        }

        public void onPageScrolled(int position,float positionOffset,int positionOffsetPixels)
        {
        }

        public void onPageSelected(int position)
        {
            // Unfortunately when TabHost changes the current tab,it kindly
            // also takes care of putting focus on it when not in touch mode.
            // The jerk.
            // This hack tries to prevent this from pulling focus out of our
            // ViewPager.
            TabWidget widget = mTabHost.getTabWidget();
            int oldFocusability = widget.getDescendantFocusability();
            widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
            mTabHost.setCurrentTab(position);
            widget.setDescendantFocusability(oldFocusability);
        }

        public void onPageScrollStateChanged(int state)
        {
        }
    }
}

如您所见,每个选项卡都调用一个特定的片段.这些片段代表每个选项卡的内容.所以让我们创建它们,它们非常简单,并且只包含TextView.

3.为第一个选项卡内容创建一个片段,将其命名为PageOneFragment.java

该片段将保存第一个选项卡的内容.您可以在此片段中放置任何内容,它将与其他片段和其他标签分开.

这里我们在onCreateView方法中扩展xml布局pageone_fragment.xml.我们将在下一步中创建此xml布局.

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PageOneFragment extends Fragment
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.pageone_fragment,false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState)
    {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onAttach(Activity activity)
    {
        super.onAttach(activity);
    }

    @Override
    public void onStart()
    {
        super.onStart();
    }

    @Override
    public void onResume()
    {
        super.onResume();
    }
}

我们必须像前面提到的那样为这个片段创建布局.

4.为PageOneFragment创建布局,将其命名为pageone_fragment.xml

这只是一个简单的布局,使用TextView来表示选项卡的内容.您可以在此布局中构建任何所需的内容,它将与其他片段和选项卡分开.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/first_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:background="#ff4063ff">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="First Page"
        android:textColor="#FFFFFF"
        android:textStyle="bold"
        android:id="@+id/firstFragmentTextView"
        android:layout_gravity="center_horizontal|top" />

</LinearLayout>

由于我们有两个选项卡,因此我们有两个片段,每个片段一个.因此,让我们为第二个标签内容创建第二个片段.

5.为第二个选项卡内容创建片段,将其命名为PageTwoFragment.java

如您所见,我们在onCreateView方法上扩展了一个不同的布局,它被称为pagetwo_fragment.xml.我们将在下一步创建它.

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PageTwoFragment extends Fragment
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.pagetwo_fragment,false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState)
    {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onAttach(Activity activity)
    {
        super.onAttach(activity);
    }

    @Override
    public void onStart()
    {
        super.onStart();
    }

    @Override
    public void onResume()
    {
        super.onResume();
    }
}

正如我们之前为PageOneFragment所做的那样,让我们为第二个片段创建布局,如前所述.

6.为PageTwoFragment创建布局,将其命名为pagetwo_fragment.xml

这是一个简单的布局,只有一个TextView,只是为了表示内容.你可以在这里构建你想要的任何东西,它将与其他片段和标签分开.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/first_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:background="#ff4063ff">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Second Page"
        android:textColor="#FFFFFF"
        android:textStyle="bold"
        android:id="@+id/firstFragmentTextView"
        android:layout_gravity="center_horizontal|top" />

</LinearLayout>

7.从NavigationDrawer中调用此片段

如果要在您的activity的displayView(int position)方法的switch语句中调用NavigationDrawer中的这个片段,您应该在一个case语句中执行此操作,例如.

case 0:
    fragment = new MyFragment();
    break;

这是最终结果

在片段上运行的ViewPager,带有两个选项卡,每个选项卡包含一个具有唯一内容的唯一片段.

而已.

希望这对你有所帮助.

原文链接：https://www.f2er.com/android/318433.html

android – Slider Menu片段中的可交换选项卡

解决方法

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