InputConnection.finishComposedText（）NullPointerException

Question

我在crashlytics上收到此错误日志。我不知道是什么原因导致了崩溃。它发生在Android 4.x，5.x，6.x设备上。（三星，索尼，LGE等）

Fatal Exception: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.view.inputmethod.InputConnection.finishComposingText()' on a null object reference
   at android.view.inputmethod.InputConnectionWrapper.finishComposingText(InputConnectionWrapper.java:78)
   at android.view.inputmethod.InputMethodManager.checkFocusNoStartInput(InputMethodManager.java:1809)
   at android.view.inputmethod.InputMethodManager.checkFocus(InputMethodManager.java:1761)
   at android.view.inputmethod.InputMethodManager.isActive(InputMethodManager.java:883)
   at android.widget.Editor$CursorAnchorInfoNotifier.updatePosition(Editor.java:4095)
   at android.widget.Editor$PositionListener.onPreDraw(Editor.java:2564)
   at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1018)
   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2313)
   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1301)
   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7021)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
   at android.view.Choreographer.doCallbacks(Choreographer.java:590)
   at android.view.Choreographer.doFrame(Choreographer.java:560)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
   at android.os.Handler.handleCallback(Handler.java:739)
   at android.os.Handler.dispatchMessage(Handler.java:95)
   at android.os.Looper.loop(Looper.java:145)
   at android.app.ActivityThread.main(ActivityThread.java:6918)
   at java.lang.reflect.Method.invoke(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:372)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

Answer 1

确保onCreateInputConnection重写方法中的输入连接不为null。

@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
    InputConnection inputConnection = super.onCreateInputConnection(outAttrs);
    if (inputConnection == null)
    {
        return null;
    }
    return new MyInputConnectionWrapper(inputConnection,
            true);
}

其中MyInputConnectionWrapper是自InputConnectionWrapper扩展的自定义输入连接包装器。