我一直在尝试在我的应用程序中实现quickactions ui模式。我发现有几个库添加了quickaction，但它们都有一个共同点：quickaction弹出窗口总是在活动中实现的。
作为应用程序的一部分，我有一个可切换的视图，其中有两个listsfragments，这允许我在这两个视图之间动态切换。但是，每当我尝试实现这个ui模式时，当调用quickaction.show时，它都会导致nullpointerexceptions。到目前为止，我已经尝试了新的快速动作，以及Qberticus的likequickactions。两者都有同样的问题。
我的问题是，有没有一个基本的限制阻止popupWindow被锚定到片段中的列表项？或者我只是做错了什么。作为参考，这是我使用的代码。
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fridge_food_tab, container,false);
listView = (ListView) v.findViewById(R.id.fridge_food_list);
getActivity().getSupportLoaderManager().initLoader(FRIDGE_FOOD_LOADER, null, this);
adapter = new FridgeCursorAdapter(getActivity().getApplicationContext(),
R.layout.fridge_list_layout, null, uiBindFrom, uiBindTo,
CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
final QuickAction qa = new QuickAction(getActivity());
ActionItem item = new ActionItem(getResources()
.getDrawable(android.R.drawable.ic_input_add));
qa.addActionItem(item); //<-- Line 51
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
qa.show(arg1);
}
});
listView.setAdapter(adapter);
return v;
}
这里有一个例外
10-06 18:40:53.617: E/AndroidRuntime(17832): FATAL EXCEPTION: main
10-06 18:40:53.617: E/AndroidRuntime(17832): java.lang.NullPointerException
10-06 18:40:53.617: E/AndroidRuntime(17832): at net.londatiga.android.QuickAction.addActionItem(QuickAction.java:151)
10-06 18:40:53.617: E/AndroidRuntime(17832): at app.le.sauce.fridge.FoodTabFragment.onCreateView(FoodTabFragment.java:51)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:871)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:160)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.view.ViewPager.populate(ViewPager.java:895)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.view.ViewPager.populate(ViewPager.java:772)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1234)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.View.measure(View.java:15172)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.View.measure(View.java:15172)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.View.measure(View.java:15172)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.View.measure(View.java:15172)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-06 18:40:53.617: E/AndroidRuntime(17832): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2150)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.View.measure(View.java:15172)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.Choreographer.doFrame(Choreographer.java:525)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.os.Handler.handleCallback(Handler.java:615)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.os.Handler.dispatchMessage(Handler.java:92)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.os.Looper.loop(Looper.java:137)
10-06 18:40:53.617: E/AndroidRuntime(17832): at android.app.ActivityThread.main(ActivityThread.java:4931)
10-06 18:40:53.617: E/AndroidRuntime(17832): at java.lang.reflect.Method.invokeNative(Native Method)
10-06 18:40:53.617: E/AndroidRuntime(17832): at java.lang.reflect.Method.invoke(Method.java:511)
10-06 18:40:53.617: E/AndroidRuntime(17832): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
10-06 18:40:53.617: E/AndroidRuntime(17832): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
10-06 18:40:53.617: E/AndroidRuntime(17832): at dalvik.system.NativeStart.main(Native Method)
最佳答案
不幸的是，这可能不是你想要的答案，因为这更多的是一个解释而不是一个解决方案。
在51号线上，你可以拨打qa.addActionItem(item);。这会导致addActionItem(ActionItem action) of QuickAction.java。所以，我做了一些调查；你的崩溃发生在文件的151行，即：
public void addActionItem(ActionItem action) {
mActionItemList.add(action);
String title = action.getTitle();
Drawable icon = action.getIcon();
View container = (View) inflater.inflate(R.layout.action_item, null);
ImageView img = (ImageView) container.findViewById(R.id.iv_icon);
TextView text = (TextView) container.findViewById(R.id.tv_title);
if (icon != null) {
img.setImageDrawable(icon); // This line here.
} else {
img.setVisibility(View.GONE);
}
// ...
}
显然，在这条线上，
icon不能是null。所以，看起来img是。由此，我们可以得出结论container不包含idiv_icon的元素。但是，当我查看action_itemxml文件时，它确实存在。所以，我有一些建议：
确认没有第二个
action_item.xml文件可以读取（在库、ITS或任何其他文件中）。清理QuickAction项目，让它生成，然后清理您的项目，让它生成，然后运行它。
玩弄图书馆代码。（测试
nulls，试着找出什么是膨胀的，什么不是。）如果所有其他操作都失败，请与库创建者联系。他的电子邮件可以在the library homepage上找到。