Weird NullPointerException in Spinner

问题:

Since Android 4.4 KitKat, i have weird crashes in my applications. It seems that it has something to do with spinner. This stacktrace of bug i am receiving:

java.lang.NullPointerException     at android.widget.TextView.makeNewLayout(TextView.java:6124)     at android.widget.TextView.onMeasure(TextView.java:6400)     at android.view.View.measure(View.java:16458)     at android.widget.Spinner.setUpChild(Spinner.java:632)     at android.widget.Spinner.makeView(Spinner.java:595)     at android.widget.Spinner.getBaseline(Spinner.java:431)     at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1089)     at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)     at android.view.View.measure(View.java:16458)     at com.android.internal.widget.ActionBarView.onMeasure(ActionBarView.java:1011)     at android.view.View.measure(View.java:16458)     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)     at com.android.internal.widget.ActionBarContainer.onMeasure(ActionBarContainer.java:271)     at android.view.View.measure(View.java:16458)     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)     at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:254)     at android.view.View.measure(View.java:16458)     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2289)     at android.view.View.measure(View.java:16458)     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1914)     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1111)     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1293)     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5582)     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)     at android.view.Choreographer.doCallbacks(Choreographer.java:562)     at android.view.Choreographer.doFrame(Choreographer.java:532)     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)     at android.os.Handler.handleCallback(Handler.java:733)     at android.os.Handler.dispatchMessage(Handler.java:95)     at android.os.Looper.loop(Looper.java:137)     at android.app.ActivityThread.main(ActivityThread.java:4998)     at java.lang.reflect.Method.invokeNative(Native Method)     at java.lang.reflect.Method.invoke(Method.java:515)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)     at dalvik.system.NativeStart.main(Native Method) 

I have spinner navigation in actionbar and i think that it has something to do with it. I am using ABS.I have track down error to getView method of my spinner array adapter. Here is my getView method:

@Override     public View getView(int position, View convertView, ViewGroup parent) {         if (LoginUtils.isLogged()) {             items[Properties.NAVIG_ITEM_MY_PROFILE] = LoginUtils.getTextForAdapter();         } else {             items[Properties.NAVIG_ITEM_MY_PROFILE] = context.getString(R.string.userProfile);         }         View view = convertView;         if (view == null) {             LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);             view = vi.inflate(R.layout.ab_spinner_item, null);         }         String text = items[position];         TextView menu = (TextView) view.findViewById(android.R.id.text1);         if (title == null) {             menu.setText(text);         } else {             menu.setText(title);         }         return view;     } 

If i comment this lines:

//if (title == null) {       menu.setText(text); //    } else { //        menu.setText(title); //    } 

problem disappears. Does anyone have any idea?

回答1:

As Peterdk describe here . You dont need to remove

android:ellipsize="marquee"

He suggests using:

inflater.inflate(android.R.layout.simple_spinner_item, null);//WRONG inflater.inflate(android.R.layout.simple_spinner_item, parent, false);//GOOD

That fixed my issue. I guess Android 4.4 is trying to be strict about inflating layout

回答2:

So i check that line in TextView class in makeNewLayout method and found that this exception is happening on this line final int height = mLayoutParams.height; Layout params are probably null.. and this line is in block that handle ellipsizing long text .. so i removed that textView attribute in xml android:ellipsize="marquee" and then problem really disappears .. strange strange

回答3:

Thanks. I got away with the crash by removing android:ellipsize from all of my layouts.

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