处理ConsecutiveViewPager

Author: teach

app/src/main/java/com/donkingliang/consecutivescrollerdemo/ViewPagerActivity.java

@@ -3,17 +3,21 @@
 import android.os.Bundle;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
-import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
 import android.widget.TextView;
 
+import com.donkingliang.consecutivescroller.ConsecutiveViewPager;
 import com.donkingliang.consecutivescrollerdemo.adapter.TabPagerAdapter;
 
 import java.util.ArrayList;
 import java.util.List;
 
+
 public class ViewPagerActivity extends AppCompatActivity {
 
+    private ConsecutiveViewPager viewPager;
+    private TabLayout tabLayout;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -24,10 +28,17 @@ protected void onCreate(Bundle savedInstanceState) {
                 "下面的例子中，通过自定义ViewPager，实现IConsecutiveScroller接口，ConsecutiveScrollerLayout能正确的处理ViewPager里" +
                 "的子布局。如果ViewPager的内容是可以垂直滑动的，请使用ConsecutiveScrollerLayout或者RecyclerView等可滑动布局作为它内容的根布局。\n" +
                 "下面的列子中使用ViewPager承载多个Fragment，Fragment的根布局为ConsecutiveScrollerLayout。");
-        ViewPager viewPager = findViewById(R.id.viewPager);
-        TabLayout tabLayout = findViewById(R.id.tabLayout);
+        viewPager = findViewById(R.id.viewPager);
+        tabLayout = findViewById(R.id.tabLayout);
         viewPager.setAdapter(new TabPagerAdapter(getSupportFragmentManager(), getTabs(), getFragments()));
         tabLayout.setupWithViewPager(viewPager);
+
+        tabLayout.post(new Runnable() {
+            @Override
+            public void run() {
+                viewPager.setAdjustHeight(tabLayout.getHeight());
+            }
+        });
     }
 
     private List<String> getTabs() {

consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveScrollerLayout.java

@@ -827,9 +827,15 @@ private void scrollUp(int offset) {
             }
 
             scrollOffset = 0;
+
             if (!isScrollBottom()) {
                 // 找到当前显示的第一个View
-                View firstVisibleView = findFirstVisibleView();
+                View firstVisibleView = null;
+                if (getScrollY() < mScrollRange) {
+                    firstVisibleView = findFirstVisibleView();
+                } else {
+                    firstVisibleView = getBottomView();
+                }
                 if (firstVisibleView != null) {
                     awakenScrollBars();
                     int bottomOffset = ScrollUtils.getScrollBottomOffset(firstVisibleView);
@@ -990,10 +996,8 @@ public void checkLayoutChange(boolean changed, boolean isForce) {
         mAdjust = 0;
         checkTargetsScroll(true, isForce);
 
-//        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
         resetChildren();
         resetSticky();
-//        }
     }
 
     /**
@@ -1043,6 +1047,9 @@ private void checkTargetsScroll(boolean isLayoutChange, boolean isForce) {
         for (int i = index + 1; i < getChildCount(); i++) {
             final View child = getChildAt(i);
             if (ScrollUtils.isConsecutiveScrollerChild(child)) {
+                if (i == getChildCount() - 1 && child instanceof ConsecutiveViewPager && getScrollY() >= mScrollRange) {
+                    continue;
+                }
                 if (child instanceof IConsecutiveScroller) {
                     List<View> views = ((IConsecutiveScroller) child).getScrolledViews();
                     if (views != null && !views.isEmpty()) {
@@ -1051,7 +1058,6 @@ private void checkTargetsScroll(boolean isLayoutChange, boolean isForce) {
                             scrollChildContentToTop(views.get(c));
                         }
                     }
-
                 } else {
                     scrollChildContentToTop(child);
                 }
@@ -1191,6 +1197,13 @@ private void stopScroll() {
         stopNestedScroll(ViewCompat.TYPE_NON_TOUCH);
     }
 
+    private View getBottomView() {
+        if (getChildCount() > 0) {
+            return getChildAt(getChildCount() - 1);
+        }
+        return null;
+    }
+
     /**
      * 返回所有的非GONE子View
      *

consecutivescroller/src/main/java/com/donkingliang/consecutivescroller/ConsecutiveViewPager.java

@@ -6,6 +6,7 @@
 import android.support.v4.view.ViewPager;
 import android.util.AttributeSet;
 import android.view.View;
+import android.view.ViewParent;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -17,6 +18,8 @@
  */
 public class ConsecutiveViewPager extends ViewPager implements IConsecutiveScroller {
 
+    private int mAdjustHeight;
+
     public ConsecutiveViewPager(@NonNull Context context) {
         super(context);
     }
@@ -25,6 +28,39 @@ public ConsecutiveViewPager(@NonNull Context context, @Nullable AttributeSet att
         super(context, attrs);
     }
 
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        if (isConsecutiveParent() && mAdjustHeight > 0) {
+            ConsecutiveScrollerLayout layout = (ConsecutiveScrollerLayout) getParent();
+            int parentHeight = layout.getMeasuredHeight();
+            int height = Math.min(parentHeight - mAdjustHeight, getDefaultSize(0, heightMeasureSpec));
+            super.onMeasure(widthMeasureSpec,
+                    View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.getMode(heightMeasureSpec)));
+        } else {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+    }
+
+    private boolean isConsecutiveParent() {
+        ViewParent parent = getParent();
+        if (parent instanceof ConsecutiveScrollerLayout) {
+            ConsecutiveScrollerLayout layout = (ConsecutiveScrollerLayout) parent;
+            return layout.indexOfChild(this) == layout.getChildCount() - 1;
+        }
+        return false;
+    }
+
+    public int getAdjustHeight() {
+        return mAdjustHeight;
+    }
+
+    public void setAdjustHeight(int adjustHeight) {
+        if (mAdjustHeight != adjustHeight) {
+            mAdjustHeight = adjustHeight;
+            requestLayout();
+        }
+    }
+
     /**
      * 返回当前需要滑动的view。
      *
@@ -55,8 +91,6 @@ public List<View> getScrolledViews() {
             for (int i = 0; i < count; i++) {
                 views.add(getChildAt(i));
             }
-        } else {
-            views.add(this);
         }
         return views;
     }