PagerSlidingTabStrip從頭到腳解析

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2、依賴dependencies compile com.astuetz:pagerslidingtabstrip:1.0.1 定義布局文件vcom.astuet z. PagerSlidingTabStrip android:id=+id/psts_i ndicatorandroid:layout_width=match_parent android:layout_height=40dp/關聯(lián) ViewPagerpublic class MainActivity extends AppCompatActivity BindView(R.id.psts_indicator)PagerSliding

3、TabStrip從頭到腳fl N% M 28QRflLU*H4RR災吉障挾菁襲201$年竄可確醴獎Android方便的憐移 MtWJ 序詞帶諜記置到遠用岡？UTi#琨非*1 的 D59er2 入門 It 畀,miicSjH瑕陰上蛉藝劃發(fā)趣鞍戰(zhàn)謀力吐權 節(jié)才沒底毎事冰冰過壘渤曬全窩福殊域舷外Jake Wharton 奔 Jff 笊 fif 的 Rx !訂 1 苻:. I - :.：OHFTWOTHIWrvdeclare-styleable name=PagerSlidingTabStripvattr name=pstsIndicatorColor format=color /vattr name

4、=pstsUnderlineColor format=color /vattr name=pstsDividerColor format=color /vattr name=pstslndicatorHeight format=dimension /v!-底部區(qū)域的咼度-vattr name=pstsUnderlineHeight format=dimension /v!-分割線與上下的間距-vattr name=pstsDividerPadding format=dimension /v!-每個 Tab 的左右邊距-vattr name=pstsTabPaddingLeftRight for

5、mat=dimension /v!-選中 tab 的滾動偏移量，個人基本沒有用到過-vattr name=pstsScrollOffset format=dimension /v!-每個 Tab 的背景圖，StateListDrawable-vattr name=pstsTabBackground format=reference /v!-是否根據(jù) tab 均為位置，true 的時候均分，默認為 false,一般都是使用默認值-vattr name=pstsShouldExpand format=boolean /v!-標題文本是否大寫，默認為true-vattr name=pstsTextA

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10、Zi孫野的兩亍麗性，文本字體大小和字體顏色pageLi stener內(nèi)部使用SJOnf agerChangeLi stener,通過set% ewFager實現(xiàn)和i ewfager的聯(lián)動delegat eFageLi stener暴壽給開炭者的接口， 類本身使用到了兩個OnPageChgeLiztener,一個用來實現(xiàn)自己的邏 輯而遠平則是留緒開水者實現(xiàn)自己需要針對“我連鈦的頁面孌化的倉輯t&bsCont&in 電 f內(nèi)部客器，用尸所見文本指示盞和國標指示爲的父書點所以，如果需要軒對文本指示器或 者是圖標指示器做卄么操作，邇過這催找孩子節(jié)點即可bttA曲呂甘aM&tiT

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13、d updatevodIconTabProvider類中比較關鍵的一些內(nèi)容，接口IconTabProvider, ViewPager 對應的 Adapter 實現(xiàn)該方法并返回每個ViewPager 對應的圖標即可實現(xiàn)圖標指示器。PageListener private class PageListener implements OnPageChangeListener Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) /存儲當前位置信息currentP

14、osition = position;currentPositionOffset = positionOffset;/滑動到子視圖scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth();invalidate。;/ 觸發(fā)重繪/用戶自定義的 OnPagerChangeListener 事件之 onPagerScrolledif (delegatePageListener != ull) delegatePageListener.onPageScrolled(posit

15、ion,positionOffset, positionOffsetPixels);Overridepublic void onPageScrollStateChanged(int state) /已經(jīng)滑動完成，offset 歸 0if (state = ViewPager.SCROLL_STATE_IDLE) scrollToChild(pager.getCurrentItem(), 0);/用戶自定義的 OnPagerChangeListener 事件之 onPageScrollStateChanged if(delegatePageListener != null) delegatePa

16、geListener.onPageScrollStateChanged(state);Overridepublic void onPageSelected(int position) 這里類內(nèi)部沒有做什么處理，只處理用戶自定義的OnPagerSelected 方法if (delegatePageListener != null) delegatePageListener.onPageSelected(position);/*滑動指定子視圖*/private void scrollToChild(int position, int offset) if (tabCount = 0) return

17、;int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;if (position 0 | offset 0) newScrollX -= scrollOffset;if (newScrollX != lastScrollX) lastScrollX = newScrollX;scrollTo(newScrollX, 0);PagerSlidingTabStrip 構造方法 構造方法的內(nèi)容不多，基本上全是基本屬性的獲取，自定義View 中常用的TypedArray ，記得回收recycle。，這里關注一下Ty

18、pedValue.applyDimension 方法的使用，全部轉(zhuǎn)換成 px。public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) super(context, attrs, defStyle);setFillViewport(true);setWillNotDraw(false);tabsContainer = new LinearLayout(context);tabsContainer.setOrientation(LinearLayout.HORIZONTAL);tabsContai

19、ner.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MA TCH_PARENT);addView(tabsContainer);DisplayMetrics dm = getResources().getDisplayMetrics();scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset,dividerPadding, dm);tabPadding = (int) Typ

20、edValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding,dm);dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth,dm);tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize,dm);/ get system attrs (android:textSize and android:t

21、extColor)TypedArray a = context.obtainStyledAttributes(attrs, A TTRS); tabTextSize =a.getDimensionPixelSize(0, tabTextSize);tabTextColor = a.getColor(1, tabTextColor);a.recycle();/ get custom attrsa = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip);indicatorColor = a.getColor

22、(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor,dm);indicatorHeight = (int)indicatorHeight, dm);underlineHeight = (int)underlineHeight, dm);dividerPadding = (int)TypedValue.applyDimension(TypedValue

23、.COMPLEX_UNIT_DIP,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,underlineColor);dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingT

24、abStrip_pstsIndicatorHeight, indicatorHeight);underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight,underlineHeight);dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding,dividerPadding);tabPadding = a.getDimensionPixelS

25、ize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight,tabPadding);tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground,tabBackgroundResId);shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);scrollOffset = a.getDimens

26、ionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset,scrollOffset);textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);a.recycle();/* 初始化矩形 Paint */rectPaint = new Paint();rectPaint.setAntiAlias(true); rectPaint.setStyle(Style.FILL);/* 初始化分割線 Paint */

27、dividerPaint = new Paint(); dividerPaint.setAntiAlias(true);dividerPaint.setStrokeWidth(dividerWidth);/* 是否延伸，默認 WRAP_CONTENT, 這種比較合理 */ defaultTabLayoutParams = newLinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MA TCH_PARENT);expandedTabLayoutParams = new LinearLayout.LayoutParam

28、s(0, LayoutParams.MA TCH_PARENT,1.0f);if (locale = null) locale = getResources().getConfiguration().locale;onDrawOverrideprotected void onDraw(Canvas canvas) super.onDraw(canvas);if (isInEditMode() | tabCount = 0) return;final int height = getHeight();/ 設置 Indicator 顏色 rectPaint.setColor(indicatorCo

29、lor);/ 獲取當前選中 TabView currentTab = tabsContainer.getChildAt(currentPosition);/獲取 Left,Right 值float lineLeft = currentTab.getLeft();float lineRight = currentTab.getRight();/ if there is an offset, start interpolating left and right coordinates between current and next tabif (currentPositionOffset 0f

30、& currentPosition tabCount - 1) /結(jié)合下一個 Tab 獲取當前要繪制的 indicator 的位置 , 這里的 currentPositionOffset 比較關 鍵，可以看到這個值是與 ViewPager 相關的，在 onPagerScrolled 方法中，這個值在不斷的更新View nextTab = tabsContainer.getChildAt(currentPosition + 1);final float nextTabLeft = nextTab.getLeft();final float nextTabRight = nextTab.g

31、etRight();lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft); lineRight =(currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight);/ 繪制 Indicator canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, rectPaint);/ 繪制 Und

32、erLine rectPaint.setColor(underlineColor);canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), height, rectPaint);/ 繪制分割線 dividerPaint.setColor(dividerColor);for (int i = 0; i tabCount - 1; i+) View tab = tabsContainer.getChildAt(i);canvas.drawLine(tab.getRight(), dividerPadding, t

33、ab.getRight(), height - dividerPadding,dividerPaint);setViewPager， setOnPageChangeListener 一個用來與 ViewPager 聯(lián)動，一個用來處理自定義的OnPagerListener 邏輯public void setViewPager(ViewPager pager) this.pager = ager;if (pager.getAdapter() = null) throw new lllegalStateException(ViewPager does not have adapter instanc

34、e.);pager.setOnPageChangeListener(pageListener); notifyDataSetChanged(); public void setOnPageChangeListener(OnPageChangeListener listener) this.delegatePageListener = listener;3. PagerS 1 i dingTabStrip環(huán)口關鍵點在于實現(xiàn)自己的OnPagerListenerOverrideprotected void onCreate(Bundle savedInstanceState) super.onCre

35、ate(savedInstanceState);setContentView(R.layout.activity_main);文本指示器選中后文本大小和酸色變化IndicaforDmoButterKnife.bind(this);MainPagerAdapter mainPagerAdapter = new MainPagerAdapter(getSupportFragmentManager();vpContent.setAdapter(mainPagerAdapter);pstsIndicator.setViewPager(vpContent); vpContent.addOnPageChangeListener(newViewPager.OnPageChangeListener() Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixel