我一直在尝试在我的应用程序中实现 QuickActions UI 模式。我发现了几个添加 QuickAction 的库,但它们都有一个共同点 - QuickAction 弹出窗口始终在 Activity 内实现。
作为我的应用程序的一部分,我有一个可滑动的 View ,其中有 2 个 ListFragments,这使我可以在两者之间动态切换。但是,每当我尝试实现此 UI 模式时,调用 QuickAction.show 时都会导致 NullPointerExceptions。到目前为止,我已经尝试过 NewQuickActions 以及 Qberticus 的 LikeQuickActions。两者都有完全相同的问题。 我的问题是,是否存在阻止 PopupWindow 锚定到 fragment 内的 ListItem 的基本限制?或者我只是做错了什么。作为引用,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;
}
这是发生的异常
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,这可能不是您正在寻找的答案,因为它更多的是一种解释而不是解决方案。
在第 51 行,您调用 qa.addActionItem(item);
。这导致 addActionItem(ActionItem action)
of QuickAction.java 。所以,我做了一些查找;您的崩溃发生在该文件的第 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);
}
// ...
}
现在,显然,在这一行中,icon
不能为 null
。所以,看起来 img
是。从这里,我们可以得出结论,container
不包含 ID 为 iv_icon
的元素。但是,当我查看 action_item
XML 文件时,它确实存在。
所以,我有一些建议:
- 验证是否没有可能正在读取的第二个
action_item.xml
文件(在您的库、其库或任何其他库中)。 - 清理 QuickAction 项目,让它构建,然后清理您的项目,让它构建,然后运行它。
- 尝试一下库代码。 (测试
null
,尝试找出哪些内容被夸大了,哪些没有。) - 如果所有其他方法都失败,请联系库创建者。他的电子邮件可以在 the library homepage 上找到。 .
关于android - 实现 QuickActions UI 模式,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12764542/