优化细节 提供 scrollTop方法

Author: haoxikang

app/src/main/java/com/example/administrator/webviewlist/MainActivity.java

@@ -27,7 +27,7 @@ protected void onCreate(Bundle savedInstanceState) {
         recyclerView = (RecyclerView) findViewById(R.id.recycler);
         recyclerView.setLayoutManager(new LinearLayoutManager(this));
         final ScrollWebView scrollWebView = new ScrollWebView(this);
-        scrollWebView.loadUrl("https://app.4c.cn/web/details?nid=244&systemType=android&phoneName=E6683&phoneCode=33e129936a25fb1ac94f351e2fea6076");
+        scrollWebView.loadUrl("http://wap.4c.cn");
         WebViewAdapter webViewAdapter = new WebViewAdapter(new MyAdapter(), scrollWebView);
         webScrollLayout.setRecyclerviewScrollBottomListener(new WebScrollLayout.RecyclerviewScrollBottom() {
             @Override
@@ -40,11 +40,8 @@ public void onScrollBottom() {
         button.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
-                    recyclerView.scrollToPosition(0);
-                    scrollWebView.scrollTo(0, 0);
+                webScrollLayout.scrollTop();
 
-
-                //    recyclerView.smoothScrollToPosition(20);
             }
         });
     }

webviewscroll/src/main/java/com/example/webviewscroll/WebScrollLayout.java

@@ -6,6 +6,7 @@
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.MotionEvent;
+import android.view.ViewConfiguration;
 import android.webkit.WebView;
 import android.widget.LinearLayout;
 
@@ -90,10 +91,6 @@ public void onSChanged(int l, int t, int oldl, int oldt) {
 
                     }else {
                         System.out.println("WebView滑动到了不是底端");
-                        if (isScrollUp && mDispatchWebView.isScroll()) {
-                            mDispatchWebView.ignoreTouchCancel(true);
-                            isIntercept = true;
-                        }
                     }
                 }
             });
@@ -144,11 +141,12 @@ public boolean dispatchTouchEvent(MotionEvent ev) {
             case MotionEvent.ACTION_MOVE:
 
                 y2 = ev.getY();
-                if (y1 - y2 > 50) {
-                    isScrollUp = true;
+                if (y1 - y2 >ViewConfiguration.get(getContext()).getScaledTouchSlop()) {
+                        isScrollUp = true;
 
                 }
-                if (y2 - y1 > 50) {
+                if (y2 - y1 > ViewConfiguration.get(getContext()).getScaledTouchSlop()) {
+
                     isScrollUp = false;
 
                 }
@@ -201,4 +199,24 @@ public interface RecyclerviewScrollBottom {
          void onScrollBottom();
 
     }
+    public void scrollTop(){
+        if (recyclerView!=null&&mDispatchWebView!=null){
+            recyclerView.scrollToPosition(0);
+            mDispatchWebView.scrollTo(0, 0);
+            if (mDispatchWebView.isScroll()){
+                mDispatchWebView.ignoreTouchCancel(true);
+                isIntercept = true;
+            }
+        }
+
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        Log.d("销毁","销毁");
+        super.onDetachedFromWindow();
+        mDispatchWebView.destroy();
+        mDispatchWebView=null;
+        recyclerView=null;
+    }
 }