增加滑动阻尼系数&头像缩放效果

ScrollableLayout/app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "com.scrollablelayout.simple"

ScrollableLayout/app/src/main/java/com/scrollablelayout/simple/MainActivity.java

@@ -9,6 +9,7 @@
 import android.support.v4.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
@@ -75,9 +76,12 @@ private void initView() {
 
         iv_spit.setVisibility(View.GONE);
         tv_title.setTranslationY(-1000);
+        sl_root.setDamping(true);
+        sl_root.computeScroll();
         sl_root.setOnScrollListener(new ScrollableLayout.OnScrollListener() {
             @Override
             public void onScroll(int translationY, int maxY) {
+                Log.d("onScroll",translationY+"/"+maxY);
                 translationY = -translationY;
                 if (titleMaxScrollHeight == 0) {
                     titleMaxScrollHeight = ((View) tv_title.getParent()).getBottom() - tv_title.getTop();
@@ -99,13 +103,18 @@ public void onScroll(int translationY, int maxY) {
                 } else {
                     iv_spit.setVisibility(View.GONE);
                 }
+                if (-translationY < hearderMaxHeight) {
+                    iv_avatar.setScaleX((hearderMaxHeight+translationY)/hearderMaxHeight);
+                    iv_avatar.setScaleY((hearderMaxHeight+translationY)/hearderMaxHeight);
+                }
 
                 iv_spit.getBackground().setAlpha(alpha);
 
                 tv_title.setTranslationY(Math.max(0, maxScrollHeight + translationY));
             }
         });
 
+        pfl_root.setPullToRefresh(false);
         pfl_root.setEnabledNextPtrAtOnce(true);
         pfl_root.setLastUpdateTimeRelateObject(this);
         pfl_root.setPtrHandler(this);

ScrollableLayout/app/src/main/res/layout/view_userinfo_header.xml

@@ -15,6 +15,7 @@
         android:id="@+id/iv_avatar_alpha"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:visibility="gone"
         android:layout_alignBottom="@+id/iv_avatar"
         android:layout_alignLeft="@+id/iv_avatar"
         android:layout_alignRight="@+id/iv_avatar"

ScrollableLayout/build.gradle

@@ -5,8 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.0.0'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
+        classpath 'com.android.tools.build:gradle:2.3.0-beta4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

ScrollableLayout/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Apr 11 12:52:13 CST 2016
+#Sat Feb 18 02:24:10 CST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

ScrollableLayout/library/build.gradle

@@ -1,11 +1,10 @@
 apply plugin: 'com.android.library'
-apply plugin: 'com.github.dcendents.android-maven'
 
 group='com.github.w446108264'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         minSdkVersion 11
@@ -22,5 +21,5 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:recyclerview-v7:22.1.1'
+    compile 'com.android.support:recyclerview-v7:23.1.1'
 }

ScrollableLayout/library/src/main/java/com/scrollablelayout/ScrollableLayout.java

@@ -53,6 +53,7 @@ public class ScrollableLayout extends LinearLayout {
 
     private int mCurY;
     private boolean isClickHead;
+    private boolean isDamping;
     private int mScrollMinY = 10;
 
     enum DIRECTION {
@@ -76,7 +77,9 @@ public ScrollableHelper getHelper() {
         return mHelper;
     }
 
-    public ScrollableLayout(Context context) { this(context, null); }
+    public ScrollableLayout(Context context) {
+        this(context, null);
+    }
 
     public ScrollableLayout(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
@@ -98,7 +101,7 @@ public ScrollableLayout(Context context, AttributeSet attrs, int defStyleAttr) {
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         mHeadView = getChildAt(0);
-        if(mHeadView != null){
+        if (mHeadView != null) {
             measureChildWithMargins(mHeadView, widthMeasureSpec, 0, MeasureSpec.UNSPECIFIED, 0);
             maxY = mHeadView.getMeasuredHeight();
             mHeadHeight = mHeadView.getMeasuredHeight();
@@ -184,6 +187,7 @@ public boolean dispatchTouchEvent(MotionEvent ev) {
                 }
                 break;
             case MotionEvent.ACTION_UP:
+                checkDamping();
                 if (flag2 && shiftY > shiftX && shiftY > mTouchSlop) {
                     mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
                     float yVelocity = -mVelocityTracker.getYVelocity();
@@ -249,9 +253,10 @@ public void computeScroll() {
                 }
             } else {
                 if (mHelper.isTop()) {
-                    int deltaY = (currY - mLastScrollerY);
+/*                    int deltaY = (currY - mLastScrollerY);
                     int toY = getScrollY() + deltaY;
-                    scrollTo(0, toY);
+                    scrollTo(0, toY);*/
+                    checkDamping();
                     if (mCurY <= minY) {
                         mScroller.forceFinished(true);
                         return;
@@ -311,6 +316,27 @@ private void recycleVelocityTracker() {
         }
     }
 
+
+    private void checkDamping() {
+        if(isDamping){
+            if (isClickHead || !isSticked()) {
+                if (maxY / 2 < mCurY) {
+                    scrollTo(0, mHeadHeight);
+                } else {
+                    scrollTo(0, 0);
+                }
+            }
+        }
+    }
+
+    public boolean isDamping() {
+        return isDamping;
+    }
+
+    public void setDamping(boolean damping) {
+        isDamping = damping;
+    }
+
     private void checkIsClickHead(int downY, int headHeight, int scrollY) {
         isClickHead = downY + scrollY <= headHeight;
     }