Android下拉菜单动态更改选项

Question

Android下拉菜单动态更改选项

9

我想在我的应用程序中使用Spinner。Spinner的上下文（项目）取决于应用程序设置中用户的偏好。

我创建了一个没有项目的Spinner。加载应用程序后，Spinner只有一个条目。要获取条目，用户必须转到菜单并加载图像。基于此，项目将被加载到字符串数组中。该字符串数组将被传递给适配器。参见代码：

List<String> als = new ArrayList<String>();
als = Arrays.asList(Data.getfloornames());
adapter = new ArrayAdapter<String>(this, R.array.flooritem, als);
adapter.notifyDataSetChanged();
floornum.setAdapter(adapter);

完成后，用户将返回到菜单设置。在菜单设置中点击设备的返回按钮会导致应用程序中止。

Error from Logcat is FATAL Exception: main.
05-16 15:12:43.193: E/AndroidRuntime(9128): android.content.res.Resources$NotFoundException: Resource ID #0x7f060002
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.content.res.Resources.getValue(Resources.java:1014)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.content.res.Resources.loadXmlResourceParser(Resources.java:2139)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.content.res.Resources.getLayout(Resources.java:853)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:371)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:193)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.Spinner.onMeasure(Spinner.java:439)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.View.measure(View.java:15518)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.Choreographer.doCallbacks(Choreographer.java:562)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.Choreographer.doFrame(Choreographer.java:532)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.os.Handler.handleCallback(Handler.java:725)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.os.Looper.loop(Looper.java:137)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at android.app.ActivityThread.main(ActivityThread.java:5041)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at java.lang.reflect.Method.invokeNative(Native Method)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at java.lang.reflect.Method.invoke(Method.java:511)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-16 15:12:43.193: E/AndroidRuntime(9128):     at dalvik.system.NativeStart.main(Native Method)

我做错了什么？在应用程序的菜单设置中无法设置下拉列表项吗？

- Irgendw Pointer

2个回答

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- vmathieu · Answer 1

尝试更改这个：

adapter.notifyDataSetChanged();
floornum.setAdapter(adapter);

转换成这个：

floornum.setAdapter(adapter);
adapter.notifyDataSetChanged();

- pskink · Answer 2

0

请查看ArrayAdapter javadoc。

textViewResourceId是一个布局文件的资源ID，其中包含一个TextView，用于在实例化视图时使用。

- pskink

Spinner没有textView。我使用String.xml中的Entries数组作为资源。我还尝试使用Spinner的布局id和id，结果始终相同。 - Irgendw Pointer

是的，将 R.array.flooritem 更改为 android.R.layout.simple_spinner_item，你会看到不同之处。 - pskink

抱歉，我刚看到你的答案。问题已经得到了Sandeep提供的答案的解决。 - Irgendw Pointer