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PONullPointerException wit Simple TabActivity
 

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    <p>I'm new to developing for Android and got really excited when I made my first app (and fully understand it or so I thought), but I just can't get it to run. It looks clean to me and I'm not sure what to look for based on the debug information. At least an explanation of what I should look for and why would be very much appreciated. I can provide any additional code you think would be helpful.</p> <p>Thank you.</p> <p>Here is my main Class:</p> <pre>package com.couchcode.realtime; import android.app.TabActivity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.widget.TabHost; import android.widget.TextView; public class Realtime extends TabActivity { TabHost tabHost = getTabHost(); TabHost.TabSpec spec; Intent intent; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tabHost.getTabWidget().setDividerDrawable(R.drawable.tab_divider); makeTab("test"); } private void makeTab(String tabTag) { intent = new Intent().setClass(this, SearchTab.class); View tabview = createTabView(tabHost.getContext(), tabTag); spec = tabHost.newTabSpec(tabTag).setIndicator(tabview).setContent(intent); tabHost.addTab(spec); tabHost.setCurrentTabByTag(tabTag); } private static View createTabView(final Context context, final String text) { View view = LayoutInflater.from(context).inflate(R.layout.tabs_bg, null); TextView tv = (TextView) view.findViewById(R.id.tabsText); tv.setText(text); return view; } } </pre> <p>And here is the output from logcat while running the debugger:</p> <pre>06-15 07:35:33.447: WARN/dalvikvm(25209): threadid=1: thread exiting with uncaught exception (group=0x401bd560) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): FATAL EXCEPTION: main 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.couchcode.realtime/com.couchcode.realtime.Realtime}: java.lang.NullPointerException 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1680) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread.access$1500(ActivityThread.java:123) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.os.Handler.dispatchMessage(Handler.java:99) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.os.Looper.loop(Looper.java:130) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread.main(ActivityThread.java:3835) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at java.lang.reflect.Method.invokeNative(Native Method) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at java.lang.reflect.Method.invoke(Method.java:507) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at dalvik.system.NativeStart.main(Native Method) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): Caused by: java.lang.NullPointerException 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.Activity.setContentView(Activity.java:1657) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.TabActivity.ensureTabHost(TabActivity.java:114) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.TabActivity.getTabHost(TabActivity.java:136) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at com.couchcode.realtime.Realtime.(Realtime.java:14) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at java.lang.Class.newInstanceImpl(Native Method) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at java.lang.Class.newInstance(Class.java:1409) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1672) 06-15 07:35:33.477: ERROR/AndroidRuntime(25209): ... 11 more </pre>
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    1. COHave you tried moving the call to getTabHost() into the body of the RealTime.onCreate() method?
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      1. PONullPointerException wit Simple TabActivity
      1. USBrandon E Taylor
 

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