I'm getting a fatal exception on the line final ViewPager mPager = (ViewPager) findViewById(R.id.view_pager);
however I cannot understand why this is happening. I have declated the viewPager in XML with the correct ID (shown below) however the app still crashes when attempting to istantiate it.
Any suggesions are greatly appreciated.
02-17 11:54:22.547: E/AndroidRuntime(13618): FATAL EXCEPTION: main
02-17 11:54:22.547: E/AndroidRuntime(13618): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.idg.omv/com.idg.omv.ui.phone.SAXParserAsyncTaskActivity}: java.lang.NullPointerException
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2232)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.ActivityThread.access$600(ActivityThread.java:156)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.os.Handler.dispatchMessage(Handler.java:99)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.os.Looper.loop(Looper.java:153)
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.ActivityThread.main(ActivityThread.java:5297)
02-17 11:54:22.547: E/AndroidRuntime(13618): at java.lang.reflect.Method.invokeNative(Native Method)
02-17 11:54:22.547: E/AndroidRuntime(13618): at java.lang.reflect.Method.invoke(Method.java:511)
02-17 11:54:22.547: E/AndroidRuntime(13618): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
02-17 11:54:22.547: E/AndroidRuntime(13618): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-17 11:54:22.547: E/AndroidRuntime(13618): at dalvik.system.NativeStart.main(Native Method)
02-17 11:54:22.547: E/AndroidRuntime(13618): Caused by: java.lang.NullPointerException
02-17 11:54:22.547: E/AndroidRuntime(13618): at android.app.Activity.findViewById(Activity.java:1852)
02-17 11:54:22.547: E/AndroidRuntime(13618): at com.idg.omv.ui.phone.SAXParserAsyncTaskActivity.<init>(SAXParserAsyncTaskActivity.java:67)
<?xml version="1.0" encoding="UTF-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/content_frame"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:focusable="true"
android:orientation="vertical" >
</LinearLayout>
<ListView
android:id="@+id/left_drawer"
android:layout_width="220dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@color/darkgrey"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:textStyle="bold" />
<ListView
android:id="@+id/videosListView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#AAFFFFFF" >
</RelativeLayout>
<RelativeLayout
android:id="@+id/footer"
android:layout_width="match_parent"
android:layout_height="50dip"
android:layout_alignParentBottom="true" >
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="wrap_content"
android:layout_height="match_parent" />
<ImageButton
android:layout_width="30dip"
android:layout_height="30dip"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="15dp"
android:focusable="false"
android:src="@drawable/scroll_lt_arrow" />
<ImageButton
android:layout_width="30dip"
android:layout_height="30dip"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="15dp"
android:focusable="false"
android:src="@drawable/scroll_rt_arrow" />
</RelativeLayout>
</android.support.v4.widget.DrawerLayout>
public class SAXParserAsyncTaskActivity extends Activity implements
OnClickListener, OnItemClickListener {
ListView listView;
List<Cmd> videos = new ArrayList<Cmd>();
CustomListViewAdapter listViewAdapter;
static final String URL = "http://exampleurl.com";
public static final String LIBRARY = "Library";
private ActionBarDrawerToggle actionBarDrawerToggle;
public static final String API_KEY = "AIzaSyC0Te2pyooXzuyLaE6_SsFlITKCwjj55fI";
public static final String VIDEO_ID = "o7VVHhK9zf0";
private int mCurrentTabPosition = NO_CURRENT_POSITION;
private static final int NO_CURRENT_POSITION = -1;
private DrawerLayout drawerLayout;
private ListView drawerListView;
private String[] drawerListViewItems;
ViewPager mPager = (ViewPager) findViewById(R.id.view_pager);
Declare the ViewPager
object before onCreate()
method and initialize that object inside the onCreate()
method as follows...
ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPager = (ViewPager) findViewById(R.id.view_pager);
}