mybtn = (ImageButton)findViewById(R.id.mybtn);
        mybtn.setOnClickListener(new View.OnClickListener(){

            public void onClick(View view) {
            	Intent nextScreen = new Intent(getApplicationContext(), ListSample.class);
            	startActivity(nextScreen);
            }
        });


<ImageButton
       android:id="@+id/mybtn"
        android:layout_width="fill_parent"
        android:layout_height="278dp"
        android:scaleType="fitXY"
        android:src="@drawable/home_page"
        android:contentDescription="@string/desc"/>


error showing in console

03-31 12:24:01.835: I/ApplicationPackageManager(15512): cscCountry is not German : INU
03-31 12:24:02.148: D/dalvikvm(15512): GC_EXTERNAL_ALLOC freed 45K, 49% free 2776K/5379K, external 408K/517K, paused 189ms
03-31 12:24:03.039: D/AndroidRuntime(15512): Shutting down VM
03-31 12:24:03.039: W/dalvikvm(15512): threadid=1: thread exiting with uncaught exception (group=0x40018578)
03-31 12:24:03.054: E/AndroidRuntime(15512): FATAL EXCEPTION: main
03-31 12:24:03.054: E/AndroidRuntime(15512): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.me.array/com.me.array.ArraysActivity}: java.lang.NullPointerException
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.os.Handler.dispatchMessage(Handler.java:99)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.os.Looper.loop(Looper.java:130)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread.main(ActivityThread.java:3687)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at java.lang.reflect.Method.invokeNative(Native Method)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at java.lang.reflect.Method.invoke(Method.java:507)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at dalvik.system.NativeStart.main(Native Method)
03-31 12:24:03.054: E/AndroidRuntime(15512): Caused by: java.lang.NullPointerException
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at com.me.array.ArraysActivity.onCreate(ArraysActivity.java:36)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
03-31 12:24:03.054: E/AndroidRuntime(15512): 	... 11 more
03-31 12:24:46.406: I/ApplicationPackageManager(15612): cscCountry is not German : INU
03-31 12:24:46.539: D/dalvikvm(15612): GC_EXTERNAL_ALLOC freed 49K, 49% free 2776K/5379K, external 408K/517K, paused 86ms
03-31 12:26:33.515: I/ApplicationPackageManager(15925): cscCountry is not German : INU
03-31 12:26:33.835: D/dalvikvm(15925): GC_EXTERNAL_ALLOC freed 50K, 49% free 2776K/5379K, external 408K/517K, paused 117ms
03-31 12:26:34.335: D/AndroidRuntime(15925): Shutting down VM
03-31 12:26:34.335: W/dalvikvm(15925): threadid=1: thread exiting with uncaught exception (group=0x40018578)
03-31 12:26:34.375: E/AndroidRuntime(15925): FATAL EXCEPTION: main
03-31 12:26:34.375: E/AndroidRuntime(15925): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.me.array/com.me.array.ArraysActivity}: java.lang.NullPointerException
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.os.Handler.dispatchMessage(Handler.java:99)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.os.Looper.loop(Looper.java:130)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread.main(ActivityThread.java:3687)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at java.lang.reflect.Method.invokeNative(Native Method)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at java.lang.reflect.Method.invoke(Method.java:507)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at dalvik.system.NativeStart.main(Native Method)
03-31 12:26:34.375: E/AndroidRuntime(15925): Caused by: java.lang.NullPointerException
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at com.me.array.ArraysActivity.onCreate(ArraysActivity.java:36)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
03-31 12:26:34.375: E/AndroidRuntime(15925): 	... 11 more