Android的时间选择器

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说到时间选择器，其实就是用到NumberPicker控件。先上效果图，分别是年、月、日、时、分、秒。
这里写图片描述

1.首先看看布局代码，比较简单就不说了，直接上代码。

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="lovelder.lovcreate.com.dateapplication.MainActivity">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:paddingLeft="10dp"        android:paddingRight="10dp">        <NumberPicker            android:id="@+id/np_year"            android:layout_width="0dp"            android:layout_weight="1.3"            android:layout_marginLeft="10dp"            android:layout_marginRight="10dp"            android:layout_height="wrap_content">        </NumberPicker>        <NumberPicker            android:id="@+id/np_month"            android:layout_width="0dp"            android:layout_weight="0.8"            android:layout_marginLeft="10dp"            android:layout_marginRight="10dp"            android:layout_height="wrap_content">        </NumberPicker>        <NumberPicker            android:id="@+id/np_day"            android:layout_width="0dp"            android:layout_weight="0.8"            android:layout_marginLeft="10dp"            android:layout_marginRight="10dp"            android:layout_height="wrap_content">        </NumberPicker>        <NumberPicker            android:id="@+id/np_hour"            android:layout_width="0dp"            android:layout_weight="0.8"            android:layout_marginLeft="10dp"            android:layout_marginRight="10dp"            android:layout_height="wrap_content">        </NumberPicker>        <NumberPicker            android:id="@+id/np_minute"            android:layout_width="0dp"            android:layout_weight="0.8"            android:layout_marginLeft="10dp"            android:layout_marginRight="10dp"            android:layout_height="wrap_content">        </NumberPicker>    </LinearLayout>    <Button        android:id="@+id/btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="點擊"        /></LinearLayout>

2.然后点击“点击按钮”，加载MyCalendarDialog，传入对话框的宽、高、布局、属性。

  btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                final MyCalendarDialog dialog = new MyCalendarDialog(MainActivity.this,360,230,R.layout.activity_calendar,R.style.DialogTheme);                dialog.setSureClick(new MyCalendarDialog.MyCalendar() {                    @Override                    public void setCalendar(int year, int month, int day, int hour, int minute) {                    dialog.dismiss();                    Toast.makeText(MainActivity.this, year + "年" + month + "月"+ day+ "日" + hour+ "时" + minute + "分", Toast.LENGTH_SHORT).show();                }            });                dialog.show();            }        });

3.分析一下自定义的MyCalendarDialog，设置对话框弹出的宽和高、属性、布局等。

  public MyCalendarDialog(Context context, int width, int height, int layout,                            int style) {        super(context, style);        // 设置内容        view = LayoutInflater.from(context).inflate(layout,null);        setContentView(view);        this.context = context;        // 设置窗口属性        Window window = getWindow();        WindowManager.LayoutParams params = window.getAttributes();        // 设置宽度、高度、密度、对齐方式        float density = getDensity(context);        params.width = (int) (width * density);        params.height = (int) (height * density);        params.gravity = Gravity.CENTER;        window.setAttributes(params);        initData();        initView();    }

4.获取当前年、月、日、时、分的值。

 private void initData() {        Calendar calendar = Calendar.getInstance();        year = calendar.get(Calendar.YEAR);        month = calendar.get(Calendar.MONTH) + 1;        day = calendar.get(Calendar.DAY_OF_MONTH);        hour = calendar.get(Calendar.HOUR_OF_DAY);        minute = calendar.get(Calendar.MINUTE);    }

5.设置年的显示格式、最小值、最大值、滑动监听等

   /**         * 年份         */        MyFormatter formatter = new MyFormatter();        np_year.setFormatter(formatter); //显示格式        np_year.setMinValue(year); //最小值        np_year.setMaxValue(5000); //最大值        np_year.setWrapSelectorWheel(false);//当待显示的条目数大于3时，设置是否可以循环滚动，注意该行应该放在上面三行的下面        np_year.setOnValueChangedListener(listener);//当值发生改变的监听        changeValueByOne(np_year, true);//没有这个方法，值增加或者减少的时候会出现异常。

6.但是NumberPicker类的方法是私有，所有无法直接调用。只能通过反射拿到此方法。

  /**     * Changes the current value by one which is increment or     * decrement based on the passes argument.     * decrement the current value.     *     * @param increment True to increment, false to decrement.     */     private void changeValueByOne(boolean increment) {        if (mHasSelectorWheel) {            mInputText.setVisibility(View.INVISIBLE);            if (!moveToFinalScrollerPosition(mFlingScroller)) {                moveToFinalScrollerPosition(mAdjustScroller);            }            mPreviousScrollerY = 0;            if (increment) {                mFlingScroller.startScroll(0, 0, 0, -mSelectorElementHeight, SNAP_SCROLL_DURATION);            } else {                mFlingScroller.startScroll(0, 0, 0, mSelectorElementHeight, SNAP_SCROLL_DURATION);            }            invalidate();        } else {            if (increment) {                setValueInternal(mValue + 1, true);            } else {                setValueInternal(mValue - 1, true);            }        }    }

7.放射拿到changeValueByOne方法，并执行。

 /**     * using reflection to change the value because     * changeValueByOne is a private function and setValue     * doesn't call the onValueChange listener.     *     * @param higherPicker the higher picker     * @param increment    the increment     */    private void changeValueByOne(final NumberPicker higherPicker, final boolean increment) {        Method method;        try {            // refelction call for            // higherPicker.changeValueByOne(true);            method = higherPicker.getClass().getDeclaredMethod("changeValueByOne", boolean.class);            method.setAccessible(true);            method.invoke(higherPicker, increment);        } catch (final NoSuchMethodException e) {            e.printStackTrace();        } catch (final IllegalArgumentException e) {            e.printStackTrace();        } catch (final IllegalAccessException e) {            e.printStackTrace();        } catch (final InvocationTargetException e) {            e.printStackTrace();        }    }

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