Is it possible to create a array with views

Question

I try to make something like this:

public static ArrayList<View> rootView = new ArrayList<View>();

But when i try to add view to it I just get a null pointer exception which makes me wonder if i do something wrong or if it just isn't possible to do this?

Thanks.

Code :

 ArrayList<View> rootView = new ArrayList<View>();
View v=inflater.inflate(R.layout.activity_main, null);
rootView.add(v);

The rootView.add(v); just makes a null pointer exception

Logcat added:

  03-19 20:49:35.543: E/AndroidRuntime(8755): FATAL EXCEPTION: main
03-19 20:49:35.543: E/AndroidRuntime(8755): java.lang.NullPointerException
03-19 20:49:35.543: E/AndroidRuntime(8755):     at code94.message.TestFragment.onCreateView(TestFragment.java:113)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.View.measure(View.java:15517)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.View.measure(View.java:15517)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.View.measure(View.java:15517)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.View.measure(View.java:15517)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2313)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.View.measure(View.java:15517)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.Choreographer.doCallbacks(Choreographer.java:562)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.Choreographer.doFrame(Choreographer.java:532)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.os.Handler.handleCallback(Handler.java:725)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.os.Looper.loop(Looper.java:137)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at android.app.ActivityThread.main(ActivityThread.java:5228)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at java.lang.reflect.Method.invokeNative(Native Method)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at java.lang.reflect.Method.invoke(Method.java:511)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
03-19 20:49:35.543: E/AndroidRuntime(8755):     at dalvik.system.NativeStart.main(Native Method)

You haven't actually shown us the code where you add the Views. — Raghav Sood
– Raghav Sood, Commented Mar 19, 2013 at 19:36
@JoakimE If the view is not Null, then you add it, without any doubt.. — Pragnani Kinnera
– Pragnani Kinnera, Commented Mar 19, 2013 at 19:44

Terry · Accepted Answer · 2013-03-19 20:30:33Z

1

Your code is valid, you can definitely create an ArrayList<View>, and you can also inflate your layout like this. So your problem is somewhere else.

You should check which object is null: v or inflater. In the first case, something is wrong maybe with your layout or with the inflation method. If the second case, your instantiation of inflater is wrong or missing.

answered Mar 19, 2013 at 20:30

Terry

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Comments

Ashok Reddy M · Accepted Answer · 2019-05-06 11:39:28Z

1

You can add views in array list

ArrayList<View> viewsList =new ArrayList<>();
// adding views to array list
viewsList.add(view1);
viewList.add(view2);

You can get views from ArrayList like below

viewsList.get(0);  //to get view at first position
viewsList.get(1);  //to get view at second position

Keep coding :)

answered May 6, 2019 at 11:39

Ashok Reddy M

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1 Comment

Javanerd Over a year ago

What if you want to use a for loop to add the views: for (int i=0;i<10;i++) {

Pablo Martinez · Accepted Answer · 2013-03-19 19:47:08Z

0

You can try this code

View child = getLayoutInflater().inflate(R.layout.child);
rootView.add(child);

answered Mar 19, 2013 at 19:47

Pablo Martinez

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2 Comments

Sam Over a year ago

You ought to explain why you believe this will work, also double check your syntax inflate() requires atleast two parameters.

Joakim Ericsson Over a year ago

this code dont change anything, the view child get a value, then when .add java.lang.NullPointerException

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