那些遇到过的问题

如何重置NumberPicker的数据

iSt*_*tar 4 android numberpicker

我使用两个NumberPicker来显示我的应用程序中的省(mProvincePicker)和城市(mCityPicker)数据.当用户更改省数据时,应相应地更改城市数据.我重置了mCityPicker数据NumberPicker.onValueChange(NumberPicker picker, int oldVal, int newVal).但它不能很好地运行java.lang.ArrayIndexOutOfBoundsException应用程序崩溃.

这是我的代码:

public class AreaPickerDialog extends Dialog implements OnValueChangeListener, OnClickListener {
    static final String TAG = "AreaPickerDialog";

    private NumberPicker mProvincePicker;
    private NumberPicker mCityPicker;
    private Button mCancelBtn;
    private Button mOKBtn;

    private AreaUtil mAreaUtil;
    private List<Area> mProvinces;
    private int mAreaId;
    private int mProvinceId;
    private Handler mHandler;

    public AreaPickerDialog(Context context, Handler handler, int areaId) {
        super(context);
        mAreaUtil = AreaUtil.getInstance();
        mProvinces = mAreaUtil.getProvinceList();
        mAreaId = areaId;
        mProvinceId = mAreaUtil.getProvinceIdByAreaId(areaId);
        mHandler = handler;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dialog_area_picker);
        mProvincePicker = (NumberPicker) findViewById(R.id.np_province);
        mCityPicker = (NumberPicker) findViewById(R.id.np_city);
        mCancelBtn = (Button) findViewById(R.id.btn_cancel);
        mOKBtn = (Button) findViewById(R.id.btn_ok);

        initProvinceData();

        mProvincePicker.setOnValueChangedListener(this);
        mCityPicker.setOnValueChangedListener(this);
        mCancelBtn.setOnClickListener(this);
        mOKBtn.setOnClickListener(this);
    }

    private void initProvinceData() {
        if (mProvinces != null && mProvinces.size() > 0) {
            String[] provinceNames = new String[mProvinces.size()];
            for (int i = 0; i < provinceNames.length; i++) {
                provinceNames[i] = mProvinces.get(i).getProvincename();
            }
            mProvincePicker.setDisplayedValues(provinceNames );
            mProvincePicker.setMinValue(1);
            mProvincePicker.setMaxValue(mProvinces.size());
        }
        mProvincePicker.setValue(mProvinceId);
        initCityData(mProvincePicker.getValue());
    }

    private void initCityData(int provinceId) {
        List<Arealist> cities = mAreaUtil.getCityListOfProvince(provinceId);
        if (cities != null && cities.size() > 0) {
            try {
                int min = Integer.parseInt(cities.get(0).getAreaid());
                int max = Integer.parseInt(cities.get(cities.size() -1).getAreaid());
                String[] cityNames = new String[cities.size()];
                for (int i = 0; i < cityNames.length; i++) {
                    cityNames[i] = cities.get(i).getName();
                }
                mCityPicker.setValue(0);
                mCityPicker.setDisplayedValues(cityNames);
                mCityPicker.setMinValue(min);
                mCityPicker.setMaxValue(max);
            } catch (NumberFormatException e) {
                ILog.e(TAG, e.getMessage(), e);
            }
        }
    }

    @Override
    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
        if (mProvincePicker.equals(picker)) {
            initCityData(mProvincePicker.getValue());
        } else if (mCityPicker.equals(picker)) {
            mAreaId = mCityPicker.getValue();
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_cancel:
            dismiss();
            break;

        case R.id.btn_ok:
            Message msg = mHandler.obtainMessage(MineActivity.MSG_UPDATE_AREA);
            msg.arg1 = mAreaId;
            msg.sendToTarget();
            dismiss();
            break;

        default:
            break;
        }
    }
}
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和logcat错误跟踪:

12-30 23:09:26.560: E/InputEventReceiver(5620): Exception dispatching input event.
12-30 23:09:26.560: W/dalvikvm(5620): threadid=1: thread exiting with uncaught exception (group=0x41ddf438)
12-30 23:09:26.580: E/AndroidRuntime(5620): FATAL EXCEPTION: main
12-30 23:09:26.580: E/AndroidRuntime(5620): java.lang.ArrayIndexOutOfBoundsException: length=14; index=15
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.updateInputTextView(NumberPicker.java:1840)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.setDisplayedValues(NumberPicker.java:1423)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at com.meishai.app.dialog.AreaPickerDialog.initCityData(AreaPickerDialog.java:88)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at com.meishai.app.dialog.AreaPickerDialog.onValueChange(AreaPickerDialog.java:100)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.notifyChange(NumberPicker.java:1855)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.setValueInternal(NumberPicker.java:1641)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.scrollBy(NumberPicker.java:1106)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.onTouchEvent(NumberPicker.java:886)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at android.view.View.dispatchTouchEvent(View.java:7127)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2170)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1905)
12-30 23:09:26.580: E/AndroidRuntime(5620):     at net.simonvt.numberpicker.NumberPicker.dispatchTouchEvent(NumberPicker.java:944)
    ....
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我正在minValue,maxValue and DisplayedValues重置以重置NumberPicker数据而不工作,那么正确的方法是什么？

CoD*_*oDe 17

在onClick setDisplayedValues(null)之前检查呼叫setMaxValue.

参考:https://stackoverflow.com/a/24322319/2624806

lu *_*uan 6

我有同样的问题,我修改它没有修改NumberPicker.java.以下是供您参考的代码.

private void initCityData(int provinceId) {
        List<Arealist> cities = mAreaUtil.getCityListOfProvince(provinceId);
        if (cities != null && cities.size() > 0) {
            try {
                int min = Integer.parseInt(cities.get(0).getAreaid());
                int max = Integer.parseInt(cities.get(cities.size() -1).getAreaid());
                String[] cityNames = new String[cities.size()];
                for (int i = 0; i < cityNames.length; i++) {
                    cityNames[i] = cities.get(i).getName();
                }
                int maxV = mCityPicker.getMaxValue();
                if (max> maxV){ 
                    mCityPicker.setMinValue(min);
                    mCityPicker.setValue(0);
                    mCityPicker.setDisplayedValues(cityNames);
                    mCityPicker.setMaxValue(max);
                }else{
                    mCityPicker.setMinValue(min);
                    mCityPicker.setValue(0);
                    mCityPicker.setMaxValue(max);
                    mCityPicker.setDisplayedValues(cityNames);
                }

            } catch (NumberFormatException e) {
                ILog.e(TAG, e.getMessage(), e);
            }
        }
    }
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iSt*_*tar 3

好吧，我查看了NumberPicker.java的源代码，发现它会重新计算数据并刷新setMinValue(int minValue)UIsetMaxValue(int minValue)中的 UI 。当设置新的minValue时，它将使用新的minValue和旧的maxValue进行计算，然后发生错误。

\n\n

因此，我修改了一些：仅在和中NumberPicker设置值，并更新 中的 UI 。当数据发生变化时，只需重置 minValue\xe3\x80\x81maxVaule 和 displayedValues 即可。注意setMinValue(int minValue)setMaxValue(int maxValue)setDisplayedValues(String[] displayedValues)NumberPickersetDisplayedValues(String[] displayedValues)必须最后调用。

\n\n

这是我修改的内容：

\n\n

NumberPicker.java:

\n\n
public void setMinValue(int minValue) {\n    if (mMinValue == minValue) {\n        return;\n    }\n    if (minValue < 0) {\n        throw new IllegalArgumentException("minValue must be >= 0");\n    }\n    mMinValue = minValue;\n    if (mMinValue > mValue) {\n        mValue = mMinValue;\n    }\n    //boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length;\n    //setWrapSelectorWheel(wrapSelectorWheel);\n    //initializeSelectorWheelIndices();\n    //updateInputTextView();\n    //tryComputeMaxWidth();\n    invalidate();\n}\n\npublic void setMaxValue(int maxValue) {\n    if (mMaxValue == maxValue) {\n        return;\n    }\n    if (maxValue < 0) {\n        throw new IllegalArgumentException("maxValue must be >= 0");\n    }\n    mMaxValue = maxValue;\n    if (mMaxValue < mValue) {\n        mValue = mMaxValue;\n    }\n    //boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length;\n    //setWrapSelectorWheel(wrapSelectorWheel);\n    //initializeSelectorWheelIndices();\n    //updateInputTextView();\n    //tryComputeMaxWidth();\n    invalidate();\n}\n\npublic void setDisplayedValues(String[] displayedValues) {\n    if (mDisplayedValues == displayedValues) {\n        return;\n    }\n    mDisplayedValues = displayedValues;\n    if (mDisplayedValues != null) {\n        // Allow text entry rather than strictly numeric entry.\n        mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT\n                | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);\n    } else {\n        mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER);\n    }\n    boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length;\n    setWrapSelectorWheel(wrapSelectorWheel);\n    updateInputTextView();\n    initializeSelectorWheelIndices();\n    tryComputeMaxWidth();\n}\n
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AreaPickerDialog.java:

\n\n
private void initCityData(int provinceId) {\n    List<Arealist> cities = mAreaUtil.getCityListOfProvince(provinceId);\n    if (cities != null && cities.size() > 0) {\n        try {\n            int min = Integer.parseInt(cities.get(0).getAreaid());\n            int max = Integer.parseInt(cities.get(cities.size() -1).getAreaid());\n            String[] cityNames = new String[cities.size()];\n            for (int i = 0; i < cityNames.length; i++) {\n                cityNames[i] = cities.get(i).getName();\n            }\n            mCityPicker.setMinValue(min);\n            mCityPicker.setMaxValue(max);\n            mCityPicker.setDisplayedValues(cityNames);\n        } catch (NumberFormatException e) {\n            ILog.e(TAG, e.getMessage(), e);\n        }\n    }\n}\n
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这是一个丑陋但有效的解决方案。

\n

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