Android中DatePicker只显示年月的方法

最近项目中有一个选择信用卡有效期的功能，只需要选择年月，但是Android原生的DatePicker默认是可以选择年月日的，所以我们要做下特殊的处理，

并且Android5.0以上和以下的版本的处理方式是不同的

关于5.0以上和以下版本为什么这么处理的原因，详见so：http://stackoverflow.com/questions/26460682/custom-date-picker-dialog-in-android-lollipop

贴上代码：

dialog_date_picker.xml

<?xml version="1.0" encoding="utf-8"?>

DatePickerDialog.java

import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.res.Resources;import android.os.Build;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import java.lang.reflect.Field;public class DatePickerDialog extends AlertDialog implements OnClickListener, OnDateChangedListener {    private static final String START_YEAR = "start_year";    private static final String START_MONTH = "start_month";    private static final String START_DAY = "start_day";    private final DatePicker mDatePickerStart;    private final OnDateSetListener mCallBack;    public interface OnDateSetListener {        void onDateSet(DatePicker startDatePicker, int startYear, int startMonthOfYear, int startDayOfMonth);    }    public DatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {        this(context, 0, callBack, year, monthOfYear, dayOfMonth);    }    public DatePickerDialog(Context context, int theme, OnDateSetListener callBack, int year, int monthOfYear,                            int dayOfMonth) {        super(context, theme);        mCallBack = callBack;        Context themeContext = getContext();        setButton(BUTTON_POSITIVE, "确 定", this);        setButton(BUTTON_NEGATIVE, "取 消", this);        setIcon(0);        LayoutInflater inflater = (LayoutInflater) themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        View view = inflater.inflate(R.layout.dialog_date_picker, null);        setView(view);        mDatePickerStart = (DatePicker) view.findViewById(R.id.datePickerStart);        mDatePickerStart.init(year, monthOfYear, dayOfMonth, this);        hideDay(mDatePickerStart);    }    private void hideDay(DatePicker mDatePicker) {        try {            /* 处理android5.0以上的特殊情况 */            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {                int daySpinnerId = Resources.getSystem().getIdentifier("day", "id", "android");                if (daySpinnerId != 0) {                    View daySpinner = mDatePicker.findViewById(daySpinnerId);                    if (daySpinner != null) {                        daySpinner.setVisibility(View.GONE);                    }                }            } else {                Field[] datePickerfFields = mDatePicker.getClass().getDeclaredFields();                for (Field datePickerField : datePickerfFields) {                    if ("mDaySpinner".equals(datePickerField.getName()) || ("mDayPicker").equals(datePickerField.getName())) {                        datePickerField.setAccessible(true);                        Object dayPicker = new Object();                        try {                            dayPicker = datePickerField.get(mDatePicker);                        } catch (IllegalAccessException e) {                            e.printStackTrace();                        } catch (IllegalArgumentException e) {                            e.printStackTrace();                        }                        ((View) dayPicker).setVisibility(View.GONE);                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }    }    public void onClick(DialogInterface dialog, int which) {        if (which == BUTTON_POSITIVE)            tryNotifyDateSet();    }    @Override    public void onDateChanged(DatePicker view, int year, int month, int day) {        if (view.getId() == R.id.datePickerStart)            mDatePickerStart.init(year, month, day, this);    }    public DatePicker getDatePickerStart() {        return mDatePickerStart;    }    public void updateStartDate(int year, int monthOfYear, int dayOfMonth) {        mDatePickerStart.updateDate(year, monthOfYear, dayOfMonth);    }    private void tryNotifyDateSet() {        if (mCallBack != null) {            mDatePickerStart.clearFocus();            mCallBack.onDateSet(mDatePickerStart, mDatePickerStart.getYear(), mDatePickerStart.getMonth(),                    mDatePickerStart.getDayOfMonth());        }    }    @Override    protected void onStop() {        super.onStop();    }    @Override    public Bundle onSaveInstanceState() {        Bundle state = super.onSaveInstanceState();        state.putInt(START_YEAR, mDatePickerStart.getYear());        state.putInt(START_MONTH, mDatePickerStart.getMonth());        state.putInt(START_DAY, mDatePickerStart.getDayOfMonth());        return state;    }    @Override    public void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);        int start_year = savedInstanceState.getInt(START_YEAR);        int start_month = savedInstanceState.getInt(START_MONTH);        int start_day = savedInstanceState.getInt(START_DAY);        mDatePickerStart.init(start_year, start_month, start_day, this);    }}

MainActivity.java

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.DatePicker;import android.widget.TextView;import java.util.Calendar;public class MainActivity extends Activity {    private Button mShowDateBTN;    private TextView mSelectDateTV;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mShowDateBTN = (Button) findViewById(R.id.btn_show_date);        mSelectDateTV = (TextView) findViewById(R.id.tv_select_date);        mShowDateBTN.setOnClickListener(new View.OnClickListener() {            Calendar c = Calendar.getInstance();            @Override            public void onClick(View v) {                new DatePickerDialog(MainActivity.this, 0, new DatePickerDialog.OnDateSetListener() {                    @Override                    public void onDateSet(DatePicker startDatePicker, int startYear, int startMonthOfYear,                                          int startDayOfMonth) {                        String textString = String.format("选择年月：%d-%d\n", startYear,                                startMonthOfYear + 1);                        mSelectDateTV.setText(textString);                    }                }, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE)).show();            }        });    }}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

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