修复viewpager绑定指示器滑动不到指定位置的问题

CrazyLifeCrazyFun · CrazyLifeCrazyFun · commit 825b34e99b92 · 2017-06-19T20:31:17.000+08:00
该问题是因为viewpager回调onpagerscroll次数缺少一些中间变化过程导致
diff --git a/tagindicatordemo/src/main/java/com/xujun/administrator/tagindicatordemo/PagerIndicatorActivity.java b/tagindicatordemo/src/main/java/com/xujun/administrator/tagindicatordemo/PagerIndicatorActivity.java
@@ -46,6 +46,12 @@ protected void initView() {
         mBtnStyle = (Button) findViewById(R.id.btn_style);
 //        tv_all.setTextSize(TypedValue.COMPLEX_UNIT_PX,14);
         tv_all.setTypeface(null, Typeface.BOLD);
+        tv_all.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mViewPager.setCurrentItem(0);
+            }
+        });
     }
 
     @Override
diff --git a/viewpagertabindicator/src/main/java/com/xujun/viewpagertabindicator/TabPagerIndicator.java b/viewpagertabindicator/src/main/java/com/xujun/viewpagertabindicator/TabPagerIndicator.java
@@ -166,6 +166,7 @@ public TabPagerIndicator(Context context, AttributeSet attrs, int defStyle) {
         }
     }
 
+
     public void setIndicatorMode(IndicatorMode indicatorMode) {
         this.setIndicatorMode(indicatorMode, false);
     }
@@ -252,7 +253,6 @@ private void obtainAttrs(Context context, AttributeSet attrs) {
 
     public void setViewPager(ViewPager pager) {
         this.pager = pager;
-
         if (pager.getAdapter() == null) {
             throw new IllegalStateException("ViewPager does not have adapter instance.");
         }
@@ -390,6 +390,8 @@ private void scrollToChild(int position, int offset) {
         if (tabCount == 0) {
             return;
         }
+        int newScrollInstance;
+
         int newScrollX;
         View child = tabsContainer.getChildAt(position);
         int left = child.getLeft();
@@ -473,6 +475,7 @@ private class PageListener implements OnPageChangeListener {
 
         @Override
         public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+            Log.d("onPageScrolled--","position--"+position+"-----positionOffset-----"+positionOffset);
                 currentPosition = position-startOffet;
                 currentPositionOffset = positionOffset;
             if(currentPosition>=0){
@@ -486,6 +489,17 @@ public void onPageScrolled(int position, float positionOffset, int positionOffse
                 Log.i(TAG, "onPageScrolled:width=" + width);
                 scrollToChild(currentPosition, (int) (positionOffset * width));
                 //调用这个方法重新绘制
+            }else{
+                if(pager.getCurrentItem()<startOffet){
+                    View child = tabsContainer.getChildAt(0);
+                    int width = child.getWidth();
+
+                    if (!isSame) {
+                        width += horizontalPadding * 2;
+                    }
+                    Log.i(TAG, "onPageScrolled:width=" + width);
+                    scrollToChild(0, (int) (positionOffset * width));
+                }
             }
             invalidate();
             if (delegatePageListener != null) {
@@ -509,8 +523,9 @@ public void onPageSelected(int position) {
 
             lastSelectPosition =selectCurPotition;
             selectCurPotition =position-startOffet;
-            Log.i("xujun", "lastSelectPosition:=" + lastSelectPosition);
-            Log.i("xujun", "selectCurPotition:=" +selectCurPotition);
+            Log.i("xujunonPageSelected", "position:=" + position);
+            Log.i("xujunonPageSelected", "lastSelectPosition:=" + lastSelectPosition);
+            Log.i("xujunonPageSelected", "selectCurPotition:=" +selectCurPotition);
 
             if(selectCurPotition>=0){
                 View currentTab = tabsContainer.getChildAt(selectCurPotition);
