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POCreating a ListView inside an ActionBar Tab fragment
 

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  1. POCreating a ListView inside an ActionBar Tab fragment
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    <p>I'm trying to create a ListView inside an ActionBar tab and can't find a suitable tutorial that can help me create this.</p> <p>Any sugestions?</p> <p>Most of the code is already taken out of tutorials, but it results in the following error:</p> <pre><code>11-25 12:44:29.875: D/libEGL(20751): loaded /system/lib/egl/libEGL_mali.so 11-25 12:44:29.885: D/libEGL(20751): loaded /system/lib/egl/libGLESv1_CM_mali.so 11-25 12:44:29.890: D/libEGL(20751): loaded /system/lib/egl/libGLESv2_mali.so 11-25 12:44:29.895: D/(20751): Device driver API match 11-25 12:44:29.895: D/(20751): Device driver API version: 10 11-25 12:44:29.895: D/(20751): User space API version: 10 11-25 12:44:29.895: D/(20751): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 11-25 12:44:29.930: D/OpenGLRenderer(20751): Enabling debug mode 0 11-25 12:44:30.045: D/AndroidRuntime(20751): Shutting down VM 11-25 12:44:30.045: W/dalvikvm(20751): threadid=1: thread exiting with uncaught exception (group=0x414fe2a0) 11-25 12:44:51.650: D/libEGL(21151): loaded /system/lib/egl/libEGL_mali.so 11-25 12:44:51.660: D/libEGL(21151): loaded /system/lib/egl/libGLESv1_CM_mali.so 11-25 12:44:51.665: D/libEGL(21151): loaded /system/lib/egl/libGLESv2_mali.so 11-25 12:44:51.665: D/(21151): Device driver API match 11-25 12:44:51.665: D/(21151): Device driver API version: 10 11-25 12:44:51.665: D/(21151): User space API version: 10 11-25 12:44:51.665: D/(21151): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 11-25 12:44:51.695: D/OpenGLRenderer(21151): Enabling debug mode 0 11-25 12:44:51.865: D/AndroidRuntime(21151): Shutting down VM 11-25 12:44:51.865: W/dalvikvm(21151): threadid=1: thread exiting with uncaught exception (group=0x414fe2a0) 11-25 12:44:51.880: E/AndroidRuntime(21151): FATAL EXCEPTION: main 11-25 12:44:51.880: E/AndroidRuntime(21151): java.lang.RuntimeException: Unable to start activity ComponentInfo{rtd.nightoutin.stellenbosch/rtd.nightoutin.stellenbosch.MainActivity}: java.lang.NullPointerException 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread.access$600(ActivityThread.java:140) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.os.Handler.dispatchMessage(Handler.java:99) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.os.Looper.loop(Looper.java:137) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread.main(ActivityThread.java:4898) 11-25 12:44:51.880: E/AndroidRuntime(21151): at java.lang.reflect.Method.invokeNative(Native Method) 11-25 12:44:51.880: E/AndroidRuntime(21151): at java.lang.reflect.Method.invoke(Method.java:511) 11-25 12:44:51.880: E/AndroidRuntime(21151): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 11-25 12:44:51.880: E/AndroidRuntime(21151): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 11-25 12:44:51.880: E/AndroidRuntime(21151): at dalvik.system.NativeStart.main(Native Method) 11-25 12:44:51.880: E/AndroidRuntime(21151): Caused by: java.lang.NullPointerException 11-25 12:44:51.880: E/AndroidRuntime(21151): at rtd.nightoutin.stellenbosch.MainActivity.onCreate(MainActivity.java:79) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.Activity.performCreate(Activity.java:5206) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083) 11-25 12:44:51.880: E/AndroidRuntime(21151): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) 11-25 12:44:51.880: E/AndroidRuntime(21151): ... 11 more 11-25 12:44:51.905: D/dalvikvm(21151): GC_CONCURRENT freed 135K, 9% free 12408K/13511K, paused 3ms+2ms, total 23ms </code></pre> <p>I do have separate classes for the Tabs which extends Fragment.</p> <p>The tabs works 100%, it's only when I try to add the ArrayAdapter and the ListView when it gives me that error.</p> <p>This is what I have so far.</p> <pre><code>import java.util.ArrayList; import java.util.HashMap; import java.util.List; import android.app.ActionBar; import android.app.ActionBar.Tab; import android.app.ActionBar.TabListener; import android.app.FragmentTransaction; import android.content.Context; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.view.ViewPager; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends FragmentActivity implements TabListener{ private ViewPager viewPager; private ActionBar actionBar; private TabsPagerAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); viewPager = (ViewPager) findViewById(R.id.pager); actionBar = getActionBar(); mAdapter = new TabsPagerAdapter(getSupportFragmentManager()); viewPager.setAdapter(mAdapter); actionBar.setDisplayShowTitleEnabled(false); actionBar.setDisplayShowHomeEnabled(false); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.addTab(actionBar.newTab() .setTabListener(this).setIcon(R.drawable.ic_tab_calendar)); actionBar.addTab(actionBar.newTab() .setTabListener(this).setIcon(R.drawable.ic_tab_favourite)); actionBar.addTab(actionBar.newTab() .setTabListener(this).setIcon(R.drawable.ic_tab_venue)); 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) { } }); final ListView listview = (ListView) findViewById(R.id.listView_event_by_day); String[] values = new String[] { "Android", "iPhone", "WindowsMobile", "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2", "Android", "iPhone", "WindowsMobile" }; final ArrayList&lt;String&gt; list = new ArrayList&lt;String&gt;(); for (int i = 0; i &lt; values.length; ++i) { list.add(values[i]); } final StableArrayAdapter adapter = new StableArrayAdapter(this, android.R.layout.simple_list_item_1, list); listview.setAdapter(adapter); } @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub viewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } private class StableArrayAdapter extends ArrayAdapter&lt;String&gt; { HashMap&lt;String, Integer&gt; mIdMap = new HashMap&lt;String, Integer&gt;(); public StableArrayAdapter(Context context, int textViewResourceId, List&lt;String&gt; objects) { super(context, textViewResourceId, objects); for (int i = 0; i &lt; objects.size(); ++i) { mIdMap.put(objects.get(i), i); } } @Override public long getItemId(int position) { String item = getItem(position); return mIdMap.get(item); } @Override public boolean hasStableIds() { return true; } } } </code></pre> <p>Any recommendations or tutorials will be greatly appreciated.</p>
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    1. COwhat is the line number **79** in `MainActivity`.
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    2. COLine 79 is listview.setAdapter(adapter);
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    3. COis that `listView_event_by_day` listview in `activity_main`
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