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POHow to run the example of ViewPager on Android developer site?
 

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  1. POHow to run the example of ViewPager on Android developer site?
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    <p>When I try to run the example with <a href="https://developer.android.com/reference/android/support/v4/view/ViewPager.html" rel="nofollow noreferrer">https://developer.android.com/reference/android/support/v4/view/ViewPager.html</a> on Eclipse,the emulator was display a error dialog . <br>Here is the LogCat:<br> <img src="https://i.stack.imgur.com/WreUj.png" alt="enter image description here"></p> <p>I just don't know why it can't run.I build the project and copy the example code in Eclipse,I also set the Android API level with 11.And it seem all is ok. <br><br> When I double click the last but one line of the LogCat:<br></p> <pre><code>at com.lanz.xbp2v4.ActionBarTabsPage.onCreate.java:37 </code></pre> <p>it redirect to the code which included in onCreate method :<br></p> <pre><code>bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); </code></pre> <p><br>So I think it may something wrong in this part of code,hope that someone can help me!XD</p> <p>the code in onCreate method:</p> <pre><code>protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mViewPager = new ViewPager(this); mViewPager.setId(R.id.pager); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(mViewPager); // Full Screen getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); final ActionBar bar = getActionBar(); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); mTabsAdapter = new TabsAdapter(this, mViewPager); mTabsAdapter.addTab(bar.newTab().setText("Simple").setTabListener((TabListener) this), IndexTab.class, null); mTabsAdapter.addTab(bar.newTab().setText("List").setTabListener((TabListener) this), Tab2.class, null); mTabsAdapter.addTab(bar.newTab().setText("Cursor").setTabListener((TabListener) this), Tab3.class, null); if (savedInstanceState != null) { bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0)); } } </code></pre> <hr> <p>I has fixed the problem above,but it still can't work.At this time I run the example app,the LogCat show:<br> <img src="https://i.stack.imgur.com/2CDGm.png" alt="enter image description here"></p> <p>it redirect to the code which included in <code>getItem()</code> method :<br></p> <pre><code> @Override public Fragment getItem(int position) { TabInfo info = mTabs.get(position); Fragment fragment=Fragment.instantiate(mContext, info.clss.getName(), info.args); return fragment; } </code></pre> <p>Is anyone can run the example code with <a href="http://developer.android.com/reference/android/support/v4/view/ViewPager.html" rel="nofollow noreferrer">Android developer ViewPager</a>?</p>
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    1. PTQuestion
    1. USVadim Kotov
    1. USLanz
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    1. PO
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    1. COSeems like your ActionBar object is null, are you sure it is being initialised?
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      1. POHow to run the example of ViewPager on Android developer site?
      1. USKent Hawkings
    2. COYour app extends and you call `this.getActionBar()`. Simply `Log()` the bar.toString() to see if its a null.
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      1. POHow to run the example of ViewPager on Android developer site?
      1. UScsikos.balint
    3. COI post the onCreate method code
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      1. POHow to run the example of ViewPager on Android developer site?
      1. USLanz
 

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