android TimePicker 踩过的坑 颜色设置

一直好好的，突然某个版本，TimePicker的字看不见了。

布局长这样

    <TimePicker
        android:id="@+id/new_act_time_picker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

然后百度到如下代码：

   private void set_timepicker_text_colour(TimePicker time_picker){
        Resources system = Resources.getSystem();
        int hour_numberpicker_id = system.getIdentifier("hour", "id", "android");
        int minute_numberpicker_id = system.getIdentifier("minute", "id", "android");
        int ampm_numberpicker_id = system.getIdentifier("amPm", "id", "android");

        NumberPicker hour_numberpicker = (NumberPicker) time_picker.findViewById(hour_numberpicker_id);
        NumberPicker minute_numberpicker = (NumberPicker) time_picker.findViewById(minute_numberpicker_id);
        NumberPicker ampm_numberpicker = (NumberPicker) time_picker.findViewById(ampm_numberpicker_id);

        set_numberpicker_text_colour(hour_numberpicker);
        set_numberpicker_text_colour(minute_numberpicker);
        set_numberpicker_text_colour(ampm_numberpicker);
    }

    private void set_numberpicker_text_colour(NumberPicker number_picker){
        final int count = number_picker.getChildCount();
        //这里就是要设置的颜色，修改一下作为参数传入会更好
        final int color = getResources().getColor(R.color.color_5_5_5);

        for(int i = 0; i < count; i++){
            View child = number_picker.getChildAt(i);

            try{
                Field wheelpaint_field = number_picker.getClass().getDeclaredField("mSelectorWheelPaint");
                wheelpaint_field.setAccessible(true);

                ((Paint)wheelpaint_field.get(number_picker)).setColor(color);
                ((EditText)child).setTextColor(color);
                number_picker.invalidate();
            }
            catch(NoSuchFieldException e){
                Log.w("setColor", e.toString());
            }
            catch(IllegalAccessException e){
                Log.w("setColor", e.toString());
            }
            catch(IllegalArgumentException e){
                Log.w("setColor", e.toString());
            }
        }
    }

加入以后，奔溃，不知原因。

研究源码：

    public TimePicker(Context context) {
        this(context, null);
    }

    public TimePicker(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.timePickerStyle);
    }

    public TimePicker(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public TimePicker(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

        final TypedArray a = context.obtainStyledAttributes(
                attrs, R.styleable.TimePicker, defStyleAttr, defStyleRes);
        final int mode = a.getInt(R.styleable.TimePicker_timePickerMode, MODE_SPINNER);
        a.recycle();

        switch (mode) {
            case MODE_CLOCK:
                mDelegate = new TimePickerClockDelegate(
                        this, context, attrs, defStyleAttr, defStyleRes);
                break;
            case MODE_SPINNER:
            default:
                mDelegate = new TimePickerSpinnerDelegate(
                        this, context, attrs, defStyleAttr, defStyleRes);
                break;
        }
    }

怎么还有两个mode？我内心是奔溃的。

MODE_CLOCK 模式，是模拟手表盘，后加的模式。

MODE_SPINNER 经典模式，也是最早的模式。

突然解惑，为什么我的TimePicker在不同版本手机上长的不一样了。

简单修改一下布局：

    <TimePicker
        android:id="@+id/new_act_time_picker"
        android:timePickerMode="spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

为了照顾老版本，就用这种模式吧。

再套用上面的代码，字体颜色改掉。