新增滑动改变监听

Author: wkp111

StickLayout2.gif

@@ -16,6 +16,7 @@ public class MainActivity extends AppCompatActivity {
     private View mTv3;
     private View mTv7;
     private View mTv4;
+    private int currentPosition = -1;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -26,24 +27,32 @@ protected void onCreate(Bundle savedInstanceState) {
         mTv3 = findViewById(R.id.tv3);
         mTv4 = findViewById(R.id.tv4);
         mTv7 = findViewById(R.id.tv7);
-//        mSl.setStickView(findViewById(R.id.tv2));
+//        mSl.setStickView(findViewById(R.id.tv2)); //设置粘性控件
 //        mSl.setStickView(findViewById(R.id.tv3));
-//        mSl.canScrollToEndViewTop(true);
+//        mSl.canScrollToEndViewTop(true);      //设置是否开启最后控件滑动到顶部
+        //设置滑动改变监听（一滑动就会有回调）
+        mSl.setOnScrollChangeListener(new StickLayout.OnScrollChangeListener() {
+            @Override
+            public void onScrollChange(StickLayout v, View currentView, int position, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
+                //直到当前控件改变在做事情
+                if (currentPosition != position) {
+                    Toast.makeText(v.getContext(), ((TextView) currentView).getText().toString(), Toast.LENGTH_SHORT).show();
+                    currentPosition = position;
+                }
+            }
+        });
     }
 
     public void addView(View view) {
         TextView textView = new TextView(view.getContext());
         textView.setGravity(Gravity.CENTER);
-        textView.setPadding(10,10,10,10);
+        textView.setPadding(10, 10, 10, 10);
         textView.setText("新条目");
-        mSl.addView(textView,0);
+        mSl.addView(textView, 0);
     }
 
-    public void click(View view) {
-        Toast.makeText(this, "第1行", Toast.LENGTH_SHORT).show();
-    }
-
-    public void scrollTo(View view) {
+    public void scrollTo2(View view) {
+        //滑动到指定子控件
         mSl.scrollToView(mTv2);
     }
 

app/src/main/java/com/wkp/sticklayout/MainActivity.java

@@ -16,14 +16,13 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
 
-        <!--app:wkp_canScrollToEndViewTop="true"-->
     <com.wkp.sticklayout_lib.widget.StickLayout
+        app:wkp_canScrollToEndViewTop="true"
         android:id="@+id/sl"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
 
         <TextView
-            android:onClick="click"
             android:id="@+id/tv1"
             android:text="第1行"
             android:gravity="center"
@@ -37,7 +36,7 @@
             android:layout_height="40dp">
 
             <TextView
-                android:onClick="scrollTo"
+                android:onClick="scrollTo2"
                 android:background="@android:color/holo_blue_light"
                 android:text="NUM2"
                 android:gravity="center"

app/src/main/res/layout/activity_main.xml

@@ -11,8 +11,8 @@ android {
 //        applicationId "com.wkp.sticklayout_lib"
         minSdkVersion 15
         targetSdkVersion 26
-        versionCode 3
-        versionName "1.0.3"
+        versionCode 4
+        versionName "1.0.4"
 
     }
 
@@ -35,7 +35,7 @@ publish {
     userOrg = 'wkp'
     groupId = 'com.wkp'
     artifactId = 'StickLayout'
-    publishVersion = '1.0.3'
+    publishVersion = '1.0.4'
     desc = 'a library to create a stickable layout'
     website = 'https://github.com/wkp111/StickLayout'
 }

sticklayout-lib/build.gradle

@@ -87,13 +87,14 @@ public interface OnScrollChangeListener {
          * Called when the scroll position of a view changes.
          *
          * @param v          The view whose scroll position has changed.
+         * @param currentView 当前子控件
+         * @param position    当前子控件索引
          * @param scrollX    Current horizontal scroll origin.
          * @param scrollY    Current vertical scroll origin.
          * @param oldScrollX Previous horizontal scroll origin.
          * @param oldScrollY Previous vertical scroll origin.
          */
-        void onScrollChange(StickLayout v, int scrollX, int scrollY,
-                            int oldScrollX, int oldScrollY);
+        void onScrollChange(StickLayout v, View currentView, int position, int scrollX, int scrollY, int oldScrollX, int oldScrollY);
     }
 
     private long mLastScroll;
@@ -667,7 +668,50 @@ protected void onScrollChanged(int l, int t, int oldl, int oldt) {
             }
         }
         if (mOnScrollChangeListener != null) {
-            mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt);
+            View currentView = null;
+            int position = -1;
+            if (mViewPair == null) {
+                for (int i = 0; i < getChildCounter(); i++) {
+                    View view = getChildIndex(i);
+                    int top = view.getTop();
+                    int bottom = view.getBottom();
+                    if (t >= top && t < bottom) {
+                        currentView = view;
+                        position = i;
+                        break;
+                    }
+                }
+            }else {
+                if (t < mCrisisHeight) {
+                    for (int i = 0; i < getChildCounter(); i++) {
+                        View view = getChildIndex(i);
+                        int top = view.getTop();
+                        int bottom = view.getBottom();
+                        if (t >= top && t < bottom) {
+                            currentView = view;
+                            position = i;
+                            break;
+                        }
+                    }
+                }else {
+                    View first = mViewPair.first;
+                    int index = indexOfChild(first);
+                    for (int i = 0; i < getChildCounter(); i++) {
+                        if (i == index) {
+                            continue;
+                        }
+                        View view = getChildIndex(i);
+                        int top = view.getTop() - first.getHeight();
+                        int bottom = view.getBottom() - first.getHeight();
+                        if (t >= top && t < bottom) {
+                            currentView = view;
+                            position = i;
+                            break;
+                        }
+                    }
+                }
+            }
+            mOnScrollChangeListener.onScrollChange(this,currentView,position, l, t, oldl, oldt);
         }
     }