Class.forName 访问 TimePickerDialog 的 NumberPicker 对象的替代方法

Question

我正在尝试创建一个自定义 TimePickerDialog 的自定义时间间隔，并使用 this question.

的答案成功解决了这个问题

问题是 Android Studio 显示以下警告：

Accessing internal APIs via reflection is not supported and may not work on all devices, or in the future. Using reflection to access hidden/private Android APIs is not safe; it will often not work on devices from other vendors, and it may suddenly stop working[...]

问题在第一行：

Class<?> classForid = Class.forName("com.android.internal.R$id");

Field timePickerField = classForid.getField("timePicker");
TimePicker mTimePicker = findViewById(timePickerField.getInt(null));
Field minuteField = classForid.getField("minute");
Field hourField = classForid.getField("hour");
NumberPicker minutePicker = mTimePicker.findViewById(minuteField.getInt(null));
NumberPicker hourPicker = mTimePicker.findViewById(hourField.getInt(null));

我需要一些替代方法来访问这两个 NumberPicker 对象。

Answer 1

我找到了使用 Resources.getSystem().getIdentifier() 的解决方案。

代码现在看起来像这样：

TimePicker timePicker = findViewById(Resources.getSystem().getIdentifier(
    "timePicker", 
    "id", 
    "android"
));

NumberPicker minutePicker = timePicker.findViewById(Resources.getSystem().getIdentifier(
    "minute", 
    "id", 
    "android"
));

NumberPicker hourPicker = timePicker.findViewById(Resources.getSystem().getIdentifier(
    "hour", 
    "id", 
    "android"
));

Class.forName 访问 TimePickerDialog 的 NumberPicker 对象的替代方法

Alternative way to access TimePickerDialog's NumberPicker objects than Class.forName

java

android

timepickerdialog