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我创建了一个应用程序，其中包含四个加载了特定 web 视图的选项卡。我计划在标签下方添加广告。在我的代码中，我将内容视图设置为创建为 TabHost 的 ViewGroup。如果我将此视图组添加到线性布局，则应用程序由于 TabHost.add(TabSpec) 获得 NullPointer 异常而崩溃。这是代码。

 public View addTabBarView(Context context)
{        
     m_vForm = _createTABForm(context);
     return m_vForm;
}     
private ViewGroup _createTABForm(Context context) {

    sTabHost = new TabHost(context,null);
    sTabHost.setLayoutParams(
            new LinearLayout.LayoutParams(
                    LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));        
    HorizontalScrollView sScrollView = new HorizontalScrollView(context);
    LinearLayout.LayoutParams sScrollViewParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
    sScrollView.setVerticalScrollBarEnabled(false);
    sScrollView.setHorizontalScrollBarEnabled(false);
    sScrollView.setScrollBarStyle(TRIM_MEMORY_UI_HIDDEN);
    sScrollView.setFillViewport(true);

    TabWidget tabWidget = new TabWidget(context); 
    LinearLayout.LayoutParams sTabWidgetParams = new LinearLayout.LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
    tabWidget.setId(android.R.id.tabs);
    sScrollView.addView(tabWidget, sTabWidgetParams);          
    sTabHost.addView(sScrollView, sScrollViewParams);         
    FrameLayout frameLayout = new FrameLayout(context);
    frameLayout.setId(android.R.id.tabcontent);
    final float scale = context.getResources().getDisplayMetrics().density;
    int paddingtop = (int) (64 * scale + 0.5f);
    frameLayout.setPadding(0, paddingtop, 0, 0);
    sTabHost.addView(frameLayout, new LinearLayout.LayoutParams(
              LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));         

    sTabHost.setup();        
    return sTabHost;
}

 public addTabItem(final String url, String tabTitle, Drawable tabIcon)
 {
  TabSpec ts1 = sTabHost.newTabSpec(tabTitle); 
        if(tabIcon==null)
            ts1.setIndicator(tabTitle);
        else
            ts1.setIndicator(tabTitle,tabIcon);        
        ts1.setContent(new TabHost.TabContentFactory(){
             @SuppressWarnings("deprecation")
            public View createTabContent(String tag)
             {               
                //Creating webview inside a layout   
             }  
        }); 
        sTabHost.addTab(ts1); //Here throws NullPointer exception.
        sTabHost.setOnTabChangedListener(this);
 }

我怎样才能达到我的要求。？

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1 回答 1

0

Are you not using an XML layout? It's much more efficient and tidy than what you have above...

You haven't included any logcat so there isnt much to go on but it seems to me that the issue is your addTabItem tries to make something arbitrary and use it as the content when really you want to be using the frameLayout as the content so try passing that into the method and setting it as the content

于 2013-11-30T01:45:34.920 回答