是否有可能建立一個享有

Question

一個數組我儘量讓這樣的事情：

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

但是，當我嘗試添加視圖到它，我只是得到一個空指針異常這使我不知道如果我這樣做有什麼不對或如果它不可能做到這一點？

謝謝。

代碼：

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

的rootView.add（V）;只是讓一個空指針異常

logcat的補充道：

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) 

Answer 1

你可以試試這個代碼

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

Answer 2

你的代碼是有效的，你絕對可以創建一個ArrayList<View>，你也可以虛增您這樣的佈局。所以你的問題在別的地方。

您應該檢查哪個對象爲空：v或inflater。在第一種情況下，您的佈局或通脹方法可能會出現問題。如果第二種情況，您的例子inflater錯誤或丟失。