Android Spinner 动态更改项目

Question

我想在我的应用中使用 Spinner。 Spinner 的上下文（项目）取决于应用程序设置中的用户偏好。

我创建了没有任何项目的 Spinner。加载应用程序后，微调器有一个条目。要获取条目，用户必须转到菜单并加载图像。基于此，项目被加载到字符串数组中。这个字符串数组将被移交给适配器。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。单击菜单设置中的设备返回按钮，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？是不是不能在应用的菜单设置中设置 Spinner Items？

Answer 1

您可以尝试以下代码在微调器中动态添加项目。

Spinner spinner = (Spinner)findViewById(R.id.mySpinner);
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, android.R.id.text1);
spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerAdapter);
spinnerAdapter.add("value");
spinnerAdapter.notifyDataSetChanged();

Answer 2

尝试改变这一点：

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

进入这个：

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

Answer 3

见ArrayAdapterjavadoc。

textViewResourceId 布局文件的资源 ID，包含 实例化视图时使用的 TextView。