android app connecting with dropbox and having problems passing to my 3rd activity from my 2nd activity
<p>hello I have built an app and I have 3 activities in it , I am new to android and this is why I am asking for help please. So I want to connect my app with dropboc app_folder , I have done than with success but now I have a problem when passing from my second activity to the 3rd.</p>

<p>I am inserting the log cat here :</p>

<pre><code>02-16 16:37:35.983: E/AndroidRuntime(1189): FATAL EXCEPTION: main
02-16 16:37:35.983: E/AndroidRuntime(1189): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.LG.lform/com.LG.lform.ListActivity}: java.lang.NullPointerException
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.os.Looper.loop(Looper.java:123)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at java.lang.reflect.Method.invokeNative(Native Method)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at java.lang.reflect.Method.invoke(Method.java:507)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at dalvik.system.NativeStart.main(Native Method)
02-16 16:37:35.983: E/AndroidRuntime(1189): Caused by: java.lang.NullPointerException
02-16 16:37:35.983: E/AndroidRuntime(1189):     at com.LG.lform.ListActivity.onCreate(ListActivity.java:163)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-16 16:37:35.983: E/AndroidRuntime(1189):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
02-16 16:37:35.983: E/AndroidRuntime(1189):     ... 11 more
</code></pre>

<p>if needed I can insert the code too, but I am not inserting it now because I don't know which part to insert , I mean the manifest.xml or the code of the 2nd activity or the 3rd one.</p>
