日期选择器

第一步:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

//获取当前日期

Calendar ca = Calendar.getInstance();

mYear = ca.get(Calendar.YEAR);

mMonth = ca.get(Calendar.MONTH);

mDay = ca.get(Calendar.DAY_OF_MONTH);

//TODO 调用时间选择器
pickerDialog = new DatePickerDialog(CleanRecordActivity.this, onDateSetListener, mYear, mMonth, mDay);

}

第二步:

private DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        Log.i(TAG, "button----->");
        mYear = year;
        mMonth = monthOfYear;
        mDay = dayOfMonth;
        String days;
        if (mMonth + 1 < 10) {
            if (mDay < 10) {
                days = new StringBuffer().append(mYear).append("-").append("0").
                        append(mMonth + 1).append("-").append("0").append(mDay).toString();
            } else {
                days = new StringBuffer().append(mYear).append("-").append("0").
                        append(mMonth + 1).append("-").append(mDay).toString();
            }
        } else {
            if (mDay < 10) {
                days = new StringBuffer().append(mYear).append("-").
                        append(mMonth + 1).append("-").append("0").append(mDay).toString();
            } else {
                days = new StringBuffer().append(mYear).append("-").
                        append(mMonth + 1).append("-").append(mDay).toString();
            }
        }
        if (startOldTime) {
            etStartTime.setText(days);
        } else {
            etEndTime.setText(days);
        }
    }
};

第三步

<!-- Activity主题 -->
<style name="Transparent.holo" parent="@android:style/Theme.Holo.Light.NoActionBar">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:screenOrientation">portrait</item>
</style>

第四步:

在AndroidManifest.xmlx文件中对应的类里面添加下面这句

android:theme="@style/Transparent.holo"

如图: