功能描述:android的原生物件擁有自己的屬性,例如在layout.xml中設定一個TextView,便有text、enable之類的屬性,若自己想要設定android沒有提供的屬性,就需要在attrs裡面設定。
res/values/attrs.xml
<declare-styleable name="CalendarPickerView"> <attr name="android:background"/> <attr name="dividerColor" format="color"/> <attr name="dayBackground" format="reference"/> <attr name="dayTextColor" format="color"/> <attr name="titleTextColor" format="color"/> <attr name="displayHeader" format="boolean"/> <attr name="headerTextColor" format="color"/> </declare-styleable> <declare-styleable name="calendar_cell"> <attr name="state_is_can_reserve" format="boolean" /> </declare-styleable>
format的類別很多color、reference、boolean…
這邊要講的是boolean的控制對應selector
建立一個CustomeView 繼承 TextView
public class CustomeView extends TextView { private static final int[] STATE_CAN_RESERVE = { R.attr.state_is_can_reserve }; private boolean isReserve = false; public void setReserve(boolean isReserve) { this.isReserve = isReserve; refreshDrawableState(); } @Override protected int[] onCreateDrawableState(int extraSpace) { final int[] drawableState = super.onCreateDrawableState(extraSpace + 1); if (isReserve) { mergeDrawableStates(drawableState, STATE_CAN_RESERVE); } } }
super.onCreateDrawableState(extraSpace + 1)
extraSpace是指android的屬性數量,因為有新增一項自定義的,所以加1
mergeDrawableStates(drawableState, STATE_CAN_RESERVE)將自定義的屬性merge進原本的
refreshDrawableState()在setReserve時就會做狀態及畫面的refresh
這樣便完成屬性的設定
再來是selector
public CalendarPickerView(Context context, AttributeSet attrs) { super(context, attrs); Resources res = context.getResources(); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CalendarPickerView); final int bg = a.getColor(R.styleable.CalendarPickerView_android_background, res.getColor(R.color.calendar_bg)); dividerColor = a.getColor(R.styleable.CalendarPickerView_dividerColor, res.getColor(R.color.calendar_divider)); dayBackgroundResId = a.getResourceId(R.styleable.CalendarPickerView_dayBackground, R.drawable.calendar_bg_selector); dayTextColorResId = a.getResourceId(R.styleable.CalendarPickerView_dayTextColor, R.color.calendar_text_selector); titleTextColor = a.getColor(R.styleable.CalendarPickerView_titleTextColor, res.getColor(R.color.calendar_text_active)); displayHeader = a.getBoolean(R.styleable.CalendarPickerView_displayHeader, true); headerTextColor = a.getColor(R.styleable.CalendarPickerView_headerTextColor, res.getColor(R.color.calendar_text_active)); a.recycle(); }
context.objainStyledAttributes(attrs, R.styleable.CalendarPickerView)
將attrs用TypeArray帶入程式,R.styleable.CalendarPickerView和attrs中的name要相同
dayTextColorResId = a.getResourceId(R.styleable.CalendarPickerView_dayTextColor,
R.color.calendar_text_selector);
將calendar_text_selector帶入
再來是selector
<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <item android:state_selected="true" android:color="@color/custom_text_selected"/> <item android:state_pressed="true" android:color="@color/custom_text_selected"/> <item app:state_current_month="false" android:color="@color/custom_text_inactive"/> <item app:state_today="true" android:color="@color/custom_text_selected"/> <item app:state_selectable="false" android:color="@color/custom_text_inactive" /> <item app:state_current_month="true" app:state_is_can_reserve="true" android:color="@color/custom_background_today" /> <item app:state_current_month="true" app:state_is_can_reserve="false" android:color="@color/custom_text_inactive" /> <item android:color="@color/custom_background_today"/> </selector>
此時,須先加入一行
xmlns:app="http://schemas.android.com/apk/res-auto"
這樣才能找到自定義的屬性
item 中的判斷很像if else 的判斷,如上,當兩個都true時才設定color