Android 带动态列表的数字选择器

我一直在用动态列表实现numpicker，也就是说，在某些事件中会发生变化，比如说可能是单击按钮或其他。问题是，每当我将列表从较大的长度切换到较小的长度时，它就会工作，从较小的长度切换到较大的长度时，它不会改变，而我总是将第一项设置为选定项，它会崩溃

代码：

日志：

06-20 13:02:16.712: E/AndroidRuntime(16793): FATAL EXCEPTION: main
06-20 13:02:16.712: E/AndroidRuntime(16793): java.lang.IllegalStateException: Could not execute method of the activity
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$1.onClick(View.java:3606)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View.performClick(View.java:4211)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$PerformClick.run(View.java:17446)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Handler.handleCallback(Handler.java:725)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Looper.loop(Looper.java:153)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.app.ActivityThread.main(ActivityThread.java:5297)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at dalvik.system.NativeStart.main(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.reflect.InvocationTargetException
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$1.onClick(View.java:3601)
06-20 13:02:16.712: E/AndroidRuntime(16793):    ... 11 more
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=2; index=4
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1722)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1537)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.setMaxValue(NumberPicker.java:1345)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.example.numpicker.MainActivity.onClick(MainActivity.java:85)
06-20 13:02:16.712: E/AndroidRuntime(16793):    ... 14 more

---

在

onClick

中的

setMaxValue

之前调用

setDisplayedValues（null）

尝试设置numPicker.setMaxValue（0）；在每次更改新的maxValue之前，这可能会有所帮助。我知道我们必须重置！但不知道调用哪个函数：-）它工作了！！经过大量的搜索，终于找到了解决方案，它成功了，谢谢你这么多的兄弟，它真的很有帮助！

06-20 13:02:16.712: E/AndroidRuntime(16793): FATAL EXCEPTION: main
06-20 13:02:16.712: E/AndroidRuntime(16793): java.lang.IllegalStateException: Could not execute method of the activity
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$1.onClick(View.java:3606)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View.performClick(View.java:4211)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$PerformClick.run(View.java:17446)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Handler.handleCallback(Handler.java:725)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.os.Looper.loop(Looper.java:153)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.app.ActivityThread.main(ActivityThread.java:5297)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at dalvik.system.NativeStart.main(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.reflect.InvocationTargetException
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invokeNative(Native Method)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at java.lang.reflect.Method.invoke(Method.java:511)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.view.View$1.onClick(View.java:3601)
06-20 13:02:16.712: E/AndroidRuntime(16793):    ... 11 more
06-20 13:02:16.712: E/AndroidRuntime(16793): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=2; index=4
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1722)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1537)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at android.widget.NumberPicker.setMaxValue(NumberPicker.java:1345)
06-20 13:02:16.712: E/AndroidRuntime(16793):    at com.example.numpicker.MainActivity.onClick(MainActivity.java:85)
06-20 13:02:16.712: E/AndroidRuntime(16793):    ... 14 more