Question

我决定创建一个小型库，使用ViewPager，Tabhost和FragmentActivity创建出色的菜单。所以我有3个小班：

绘制菜单（绘制所有xml内容）

public class DrawAMKMenu extends FragmentActivity {

protected LinearLayout mLinearLayout;
protected static TabHost mTabHost;
protected static Context mContext;
protected ViewPager mViewPager;
protected RelativeLayout mMenuBar;
protected Resources res;
protected int screenwidth;

protected Drawable ThumbResource = null;
protected Drawable menuBg = null;
protected TabWidget tw;



/**
 * constructor
 * @param c
 * @param main_layout
 */
protected DrawAMKMenu(FragmentActivity fa, LinearLayout main_layout){
    mContext = fa.getApplicationContext();
    mLinearLayout = main_layout;
    res = fa.getResources();
    Display display = fa.getWindowManager().getDefaultDisplay(); 
    screenwidth = display.getWidth();

}

/**
 *Draw main LinearLayout 
 */
protected void DrawMenu()
{
    mLinearLayout.removeAllViews();
    mLinearLayout.setBaselineAligned(true);
    mLinearLayout.setOrientation(LinearLayout.VERTICAL);
    mLinearLayout.addView(createTabHost());
}
/**
 * @return TabHost
 * draw the TabHost view
 */
protected TabHost createTabHost(){

    mTabHost = new TabHost(mContext);
    mTabHost.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));


    mTabHost.addView(createTabContentLayout());
    mTabHost.addView(createViewPager());
    mTabHost.addView(createMenuBar());  

    mTabHost.setTag("TabHost");
    SetupTabs(mTabHost);



    return mTabHost;
}
/**
 * Create FrameLayout for Content
 * @return FrameLayout
 */
protected FrameLayout createTabContentLayout(){
    /*Frame layout for Content*/
    FrameLayout fl = new FrameLayout(mContext); 
    fl.setLayoutParams(new LinearLayout.LayoutParams(0,0,1));
    fl.setId(android.R.id.tabcontent);
    /*------------------------*/
    return fl;
}

/**
 * @return ViewPager
 * draw ViewPager element
 */
protected ViewPager createViewPager(){
    mViewPager = new ViewPager(mContext);
    mViewPager.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT,1));
    mViewPager.setBackgroundColor(Color.WHITE);
    mViewPager.setTag("viewpager");
    return mViewPager;
}  

/**
 * @return RelativeLayout
 * draw Menu bar 
 */
protected RelativeLayout createMenuBar(){
    /* Layout for Menu Bar */
    mMenuBar = new RelativeLayout(mContext);
    mMenuBar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
    //mMenuBar.setGravity(Gravity.BOTTOM);

    /* ------------------ */

    /* Tab Widget*/
    tw =  new TabWidget(mContext);
    tw.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT,0));
    tw.setOrientation(LinearLayout.HORIZONTAL);

    tw.setId(android.R.id.tabs);
    if(menuBg != null)
        tw.setBackgroundDrawable(menuBg);
    /*-----------*/

    /* Scroll bar for menu */
    HorizontalScrollView hsv = new HorizontalScrollView(mContext);
    hsv.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT,0));
    hsv.setScrollBarStyle(View.GONE);
    hsv.setFillViewport(true);
    /* ----------------- */

    //add tabWidget to HorizontalScrollView
    hsv.addView(tw);

    /*Seek Bar*/
    SeekBar sb = new SeekBar(mContext);
    sb.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
    sb.setBackgroundColor(Color.TRANSPARENT);
    sb.setProgressDrawable(res.getDrawable(android.R.id.empty));

    if(ThumbResource!=null)
        sb.setThumb(ThumbResource);
    else
        sb.setThumb(res.getDrawable(android.R.id.empty));
    /*-------*/


    /*Frame layout for SeekBar*/
    FrameLayout fl = new FrameLayout(mContext);
    fl.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
    fl.addView(sb);
    /*------------------------*/


    mMenuBar.addView(hsv);
    mMenuBar.addView(fl);
    return mMenuBar;

}

/**
 * Delete bottom strip from tabhost
 * @param tabHost
 */
protected void SetupTabs(TabHost tabHost) {

    Field mBottomLeftStrip;
    Field mBottomRightStrip;

    try {
        mBottomLeftStrip = tw.getClass().getDeclaredField("mBottomLeftStrip");
        mBottomRightStrip = tw.getClass().getDeclaredField("mBottomRightStrip");

        if (!mBottomLeftStrip.isAccessible()) {
            mBottomLeftStrip.setAccessible(true);
        }

        if (!mBottomRightStrip.isAccessible()) {
            mBottomRightStrip.setAccessible(true);
        }

        mBottomLeftStrip.set(tw,  res.getDrawable(Color.TRANSPARENT));
        mBottomRightStrip.set(tw, res.getDrawable(Color.TRANSPARENT));

    } 
    catch (java.lang.NoSuchFieldException e) {
        // possibly 2.2
        try {
            Method stripEnabled = tw.getClass().getDeclaredMethod("setStripEnabled", boolean.class);
            stripEnabled.invoke(tw, false);
        } 
        catch (Exception e1) {
            e1.printStackTrace();
        }
    } 
    catch (Exception e) {}
}



}

PagerAdapter类

public class PagerAdapter extends FragmentPagerAdapter 

private List<Fragment> pFragments;

/**
 * @param fm
 * @param fragments
 */
public PagerAdapter(FragmentManager fm, List<Fragment> fr) {
    super(fm);
    this.pFragments = fr;
}

/* (non-Javadoc)
 * @see android.support.v4.app.FragmentPagerAdapter#getItem(int)
 */
@Override
public Fragment getItem(int position) {
    return this.pFragments.get(position);
}

/* (non-Javadoc)
 * @see android.support.v4.view.PagerAdapter#getCount()
 */
@Override
public int getCount() {
    return this.pFragments.size();
}
}

创建菜单类。

公共类AMKMenu扩展DrawAMKMenu实现TabHost.OnTabChangeListener，ViewPager.OnPageChangeListener {

private PagerAdapter mPagerAdapter;
private Vector<Fragment> fragments;
private FragmentManager mFragmentManager;
private FragmentActivity mFragmentActivity;
private static HashMap<Integer, Class<?>> TabsClass;
private static HashMap<Integer, String> TabsTabName;
private static HashMap<Integer, Drawable> TabsIcon;


/**
 * CONSTRUCTOR
 * Create AMKMenu object to setup settings and 
 * also initialize menu 
 * @param c
 * @param main_layout
 * @param fm 
 * @param screenWidth
 */
public AMKMenu(FragmentActivity fa, LinearLayout main_layout) {
    super(fa, main_layout);
    mFragmentActivity = fa;
    mFragmentManager = fa.getSupportFragmentManager();
    TabsClass = new HashMap<Integer, Class<?>>();
    TabsTabName = new HashMap<Integer, String>();
    TabsIcon = new HashMap<Integer, Drawable>();

}


/**
 * Final method to create menu
 * Use it after you setup all settings
 */
public void createMenu(){
    super.DrawMenu();
    initializeTabHost();
    intializeViewPager();

}
/**
 * A simple factory that returns dummy views to the Tabhost
 * @author Gavryschuk Anatoliy V.
 */
public class TabFactory implements TabContentFactory {

    private final Context fContext;

    /**
     * @param context
     */
    public TabFactory(Context context) {
        fContext = context;
    }

    /** (non-Javadoc)
     * @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String)
     */
    public View createTabContent(String tag) {
        View v = new View(fContext);
        v.setMinimumWidth(0);
        v.setMinimumHeight(0);
        return v;
    }

}
/**
 * Initialize ViewPager
 */
protected void intializeViewPager() {
    fragments = new Vector<Fragment>();
    if(getTabsClass().size()>0)
    {
        for(int i=0;i<getTabsClass().size();i++)
        {
            fragments.add(Fragment.instantiate(mFragmentActivity, getTabsClass(i).getName()));
        }
    }

    setPagerAdapter(new PagerAdapter (mFragmentManager, fragments));
    mViewPager.setAdapter(getPagerAdapter());
    mViewPager.setOnPageChangeListener(this);
}
/**
 * Initialize the Tab Host
 */
protected void initializeTabHost() {
    if(getTabsClass().size()>0)
    {

        TabHost mTabHost = (TabHost) mLinearLayout.findViewWithTag("TabHost");
        mTabHost.setup();
        for(int i=0;i<getTabsClass().size();i++)
        {
            TabSpec tabSpec = mTabHost.newTabSpec(getTabsTabName(i));
            tabSpec.setIndicator(getTabsTabName(i), getTabsIcon(i));
            tabSpec.setContent(new TabFactory(mFragmentActivity));
            mTabHost.addTab(tabSpec);
        }

        mTabHost.setOnTabChangedListener(this);
        mTabHost.getTabWidget().setHorizontalScrollBarEnabled(false);

        for(int i=0;i<mTabHost.getTabWidget().getChildCount();i++)
        {
            //mTabHost.getTabWidget().getChildAt(i).setLayoutParams(new LinearLayout.LayoutParams(65,65));
            mTabHost.getTabWidget().getChildAt(i).setBackgroundResource(0);
        }


        //  mTabHost.setCurrentTab(0);
    }else
        return;
}...
}

以这种方式使用这个库之后

AMKMenu menu = new AMKMenu(this, (LinearLayout)findViewById(R.id.main_layout));

    menu.setMenuBg(getResources().getDrawable(R.drawable.menu_bg));
    menu.setCursor(getResources().getDrawable(R.drawable.new_cursor));

    menu.AddTab(Tab1Fragment.class, "tab1", getResources().getDrawable(R.drawable.f_icon));
    menu.AddTab(Tab2Fragment.class, "tab2", getResources().getDrawable(R.drawable.s_icon));
    menu.AddTab(Tab3Fragment.class, "tab3", getResources().getDrawable(R.drawable.t_icon)); 
    menu.createMenu();

我收到错误

java.lang.IllegalArgumentException：找不到片段
的id的新内容

问题在于AMKMenu类中的intializeViewPager（）方法。

请有人（Android大师）帮助我，我做错了什么？我希望我能清楚地解释一切。

Answer 1

听到我的解决方案（Tabs + Fragment + ViewPager）它对我来说很有用，希望对你有用

听到的是xml文件

<LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >

        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="0dip"
            android:layout_height="match_parent"
            android:layout_weight="5" />

        <FrameLayout
            android:id="@+id/fragment_details"
            android:layout_width="0px"
            android:layout_height="match_parent"
            android:layout_weight="4.3" />
    </LinearLayout>

听到是MainActivity.java的代码我只发布相关代码，所以你必须管理它

public class MainActivity extends FragmentActivity implements
        DialogInterface.OnDismissListener, TabDataResponder {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        artistTab = getSupportActionBar().newTab().setText(
                R.string.tab_name_artist);
        albumTab = getSupportActionBar().newTab().setText(
                R.string.tab_name_album);
        songTab = getSupportActionBar().newTab().setText(
                R.string.tab_name_songs);

        map = new HashMap<String, Integer>();
        mViewPager = (ViewPager) findViewById(R.id.pager);
        FrameLayout deatil = (FrameLayout) findViewById(R.id.fragment_details);
        mDualPane = (deatil != null) && (deatil.getVisibility() == View.VISIBLE);
        mTabsAdapter = new TabsAdapter(this, getSupportActionBar(), mViewPager);

        if (savedInstanceState != null) {
            flag = true;
            index = savedInstanceState.getInt("index");
        }

        setUpTabView();

    }


    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("index", getSupportActionBar()
                .getSelectedNavigationIndex());
    }

    private void setUpTabView() {
        mTabsAdapter.addTab(artistTab, ArtistFragment.class, null);
        mTabsAdapter.addTab(albumTab, AlbumFragment.class, null);
        mTabsAdapter.addTab(songTab, SongFragment.class, null);
        getSupportActionBar().setSelectedNavigationItem(index);
    }

    public static class TabsAdapter extends FragmentPagerAdapter implements
            ViewPager.OnPageChangeListener, ActionBar.TabListener {

        private FragmentActivity mContext;
        private ActionBar mActionBar;
        private final ViewPager mViewPager;

        private final ArrayList<String> mTabs = new ArrayList<String>();
        private TabDataResponder responder;

        public TabsAdapter(FragmentActivity activity, ActionBar actionBar,
                ViewPager pager) {

            super(activity.getSupportFragmentManager());
            mContext = activity;
            mActionBar = actionBar;
            mViewPager = pager;

            // TabDataResponder is an interface which is implemented in MainActivity
            // You can find implementation @ the last

            responder = (TabDataResponder) activity;
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);

            //I have used map to save state of the fragment
            map.put(SongFragment.TYPE_FRAGMENT.trim(), 0);
            map.put(AlbumFragment.TYPE_FRAGMENT.trim(), 0);
            map.put(ArtistFragment.TYPE_FRAGMENT.trim(), 0);
        }

        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
            mTabs.add(clss.getName());
            // mArgs.add(args);
            mActionBar.addTab(tab.setTabListener(this));
            notifyDataSetChanged();
        }

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

        @Override
        public Fragment getItem(int position) {
            return Fragment
                    .instantiate(mContext, mTabs.get(position), /*
                                                                 * mArgs.get(
                                                                 * position)
                                                                 */null);
        }

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

        @Override
        public void onPageSelected(int position) {
            Log.i(TAG, "PageSelected....");
            mActionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            Log.i(TAG, "ScrollSateChanged....");
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            mViewPager.setCurrentItem(tab.getPosition());
            String a = null;
            if (mDualPane) {
                a = mTabs.get(tab.getPosition());
                responder.loadData(a, map.get(a));
            }
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            Log.i(TAG, "Tab is released now....");
        }
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        setUpTabView();

    }
//This interface must be call from fragment class 
//@ the time of event you want to show detail 
// pass the class name in the type argument using class.getName() method
    @Override
    public void loadData(String type, int index) {
        DetailFragment viewer = (DetailFragment) getSupportFragmentManager()
                .findFragmentById(R.id.fragment_details);
        if (mDualPane) {
            if (viewer == null || viewer.getShownIndex() != index
                    || viewer.getTypeFragment() != type) {

                DetailFragment df = DetailFragment.newInstance(index, type);
                getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fragment_details, df)
                        .setTransition(
                                FragmentTransaction.TRANSIT_FRAGMENT_FADE)
                        .commit();
                map.put(type.trim(), index);

            }

        } else {
            Intent intent = new Intent();
            intent.setClass(MainActivity.this, DetailActivity.class);
            intent.putExtra("index", index);
            intent.putExtra("type", type);
            startActivity(intent);
        }
    }
}

并且听说我是如何处理细节片段效率不高但工作有点

public class DetailFragment extends Fragment{

    public static DetailFragment newInstance(int index, String  TYPE_FRAGMENT) {
        DetailFragment f = new DetailFragment();

        // Supply index input as an argument.
        Bundle args = new Bundle();
        args.putInt("index", index);
        args.putString("type", TYPE_FRAGMENT);
        f.setArguments(args);

        return f;
    }



    public int getShownIndex() {
        return getArguments().getInt("index", 0);
    }

    public String getTypeFragment(){
        String a = getArguments().getString("type");
        return a;
    }


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

        //template is blank layout
        View view =  inflater.inflate(R.layout.template, container, false);
        if(getTypeFragment().equals(ArtistFragment.TYPE_FRAGMENT)){
            view = null;
            view = inflater.inflate(R.layout.artist_details, container, false);
            //....

        }
        else if(getTypeFragment().equals(AlbumFragment.TYPE_FRAGMENT)){

            //do's for album fragment
        }
        else if(getTypeFragment().equals(SongFragment.TYPE_FRAGMENT)){
            //do's for song fragment
        }
        return view;
    }

}

不要将标签状态保存在各自的片段中会发生冲突，我们已经在听取了

希望它有助于

来自android.support.v4的ViewPager，TabHost和Fragments。一起工作并不起作用

1 个答案: