java.lang.NullPointerException：在 android.widget.Editor.updateFloatingToolbarVisibility [重复]

Question

java.lang.NullPointerException: 
  at android.widget.Editor.updateFloatingToolbarVisibility(Editor.java:1541)
  at android.widget.Editor.onTouchEvent(Editor.java:1491)
  at android.widget.TextView.onTouchEvent(TextView.java:10025)
  at android.view.View.dispatchTouchEvent(View.java:10723)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
  at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:559)
  at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1870)
  at android.app.Activity.dispatchTouchEvent(Activity.java:3236)
  at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:521)
  at android.view.View.dispatchPointerEvent(View.java:10952)
  at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5117)
  at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4969)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4500)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4553)
  at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4519)
  at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4652)
  at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4527)
  at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4709)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4500)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4553)
  at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4519)
  at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4527)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4500)
  at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7007)
  at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6936)
  at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6897)
  at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7117)
  at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
  at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method:0)
  at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
  at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:7081)
  at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:7144)
  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:927)
  at android.view.Choreographer.doCallbacks(Choreographer.java:702)
  at android.view.Choreographer.doFrame(Choreographer.java:632)
  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913)
  at android.os.Handler.handleCallback(Handler.java:751)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:154)
  at android.app.ActivityThread.main(ActivityThread.java:6682)
  at java.lang.reflect.Method.invoke(Native Method:0)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

这不是重复的帖子。

一位用户报告了这个问题，但我不知道如何重现和修复它。它发生在 Android N 三星设备中。

我猜它发生在 EditText 中。

任何建议。

Answer 1

空指针异常几乎总是因为一个元素在尝试引用它之前没有在代码中正确初始化。 例如。在尝试使用之前确保 TextView 对象存在：

TextView myTextView = new TextView();