Question

我在Activity上有这个代码，我再次回到这个活动并更新ArrayList数据。

{ArrayAdapter<String> adaptador =       
   new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, datos);

spinnerD = (Spinner)findViewById(R.id.spinner1);

adaptador.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerD.setAdapter(adaptador);

当我在“重新打开”活动后尝试打开微调器时，我得到以下错误：

11-08 04:13:14.313: ERROR/AndroidRuntime(272): FATAL EXCEPTION: main
11-08 04:13:14.313: ERROR/AndroidRuntime(272): java.lang.NullPointerException
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:376)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.Spinner$DropDownAdapter.getDropDownView(Spinner.java:329)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.Spinner$DropDownAdapter.getView(Spinner.java:325)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.AbsListView.obtainView(AbsListView.java:1294)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.ListView.measureHeightOfChildren(ListView.java:1198)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.ListView.onMeasure(ListView.java:1109)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.View.measure(View.java:8171)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.View.measure(View.java:8171)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.View.measure(View.java:8171)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.View.measure(View.java:8171)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.View.measure(View.java:8171)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.os.Looper.loop(Looper.java:123)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at android.app.ActivityThread.main(ActivityThread.java:4627)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at java.lang.reflect.Method.invokeNative(Native Method)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at java.lang.reflect.Method.invoke(Method.java:521)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-08 04:13:14.313: ERROR/AndroidRuntime(272):     at dalvik.system.NativeStart.main(Native Method)
11-08 04:13:16.052: ERROR/MetadataRetrieverClient(33): failed to extract an album art

Answer 1

spinnerD.setAdapter(adaptador1);

什么是adaptador1，你正在创建'adaptador'，然后你将adaptador1设置为spinnerD.setAdapter(adaptador1)。它是否正确？ 'adaptador1'可能为空/空..

更新微调器时出错

1 个答案: