Question

嘿我有一个简单的NumberPicker，有15个值（100,200,300,400，...，1500）。当我滚动数字时，当我到达数字1400（位置13）时，numberpicker会抛出一个ArrayIndexOutOfBoundsException。见下面的日志。

但我真的不知道。这似乎是numberpicker类的一个bug。

这是我的代码：

 tv_radius.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog dialog = new Dialog(CostLogActivity2.this);
                dialog.setContentView(R.layout.radius_picker);
                dialog.setTitle("Radius");

                NumberPicker np_radius = (NumberPicker) dialog.findViewById(R.id.np_radius);

                 np_radius.setMaxValue(100); // max value 100
                 np_radius.setMinValue(1);   // min value 1
                 np_radius.setWrapSelectorWheel(false);

                String[] displayedValues = new String[15];
                int x=0;
                 for(int i=0; i<displayedValues.length; i++){
                     x = x+100;
                     displayedValues[i] = Integer.toString(x);

                 }

                 np_radius.setDisplayedValues(displayedValues);

                np_radius.setOnValueChangedListener(new OnValueChangeListener() {

                    @Override
                    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                        // TODO Auto-generated method stub

                    }
                });

                dialog.show();

            }               

        });

错误日志：

04-07 13:55:33.383: E/AndroidRuntime(20233): FATAL EXCEPTION: main
04-07 13:55:33.383: E/AndroidRuntime(20233): java.lang.ArrayIndexOutOfBoundsException: length=15; index=15
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1774)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.widget.NumberPicker.incrementSelectorIndices(NumberPicker.java:1739)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.widget.NumberPicker.scrollBy(NumberPicker.java:1008)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.widget.NumberPicker.computeScroll(NumberPicker.java:964)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.drawChild(ViewGroup.java:2729)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.getDisplayList(View.java:10475)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.getDisplayList(View.java:10475)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.getDisplayList(View.java:10475)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.getDisplayList(View.java:10475)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.draw(View.java:11041)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.widget.FrameLayout.draw(FrameLayout.java:450)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2151)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.View.getDisplayList(View.java:10477)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:873)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewRootImpl.draw(ViewRootImpl.java:1914)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1638)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2452)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.os.Looper.loop(Looper.java:137)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at android.app.ActivityThread.main(ActivityThread.java:4464)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at java.lang.reflect.Method.invokeNative(Native Method)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at java.lang.reflect.Method.invoke(Method.java:511)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:822)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:589)
04-07 13:55:33.383: E/AndroidRuntime(20233):    at dalvik.system.NativeStart.main(Native Method)

有谁知道如何修复它？

Answer 1

这不是一个错误。来自docs：

显示值数组的长度必须等于可选数字的范围，等于getMaxValue() - getMinValue() + 1。

maxValue为100，minValue为1.所以，请改用它：

numberPicker.setMaxValue(14);
numberPicker.setMinValue(0);

您还可以查看here

Answer 2

您的问题的Android文档是here。

问题在于这段代码np_radius.setMaxValue(100)。您应该将此行替换为np_radius.setMaxValue(14)。

在滚动值时，Numberpicker会抛出ArrayIndexOutOfBoundsException

2 个答案: