AppBarLayout與片段

Question

那麼，情況是這樣的：

我需要實現我的主要活動AppBar滾動行爲，但是，我已經有CoordinatorLayout和AppBarLayout我用相同的滾動行爲片段。

這裏是從兩個佈局的XML：

activity_main：

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:background="#EBEDEC"> 

<android.support.v7.widget.Toolbar 
    android:id="@+id/toolbar" 
    android:layout_width="match_parent" 
    android:layout_height="?attr/actionBarSize" 
    android:background="?attr/colorPrimary" 
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <ImageView 
      android:id="@+id/toolbar_open_nav" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_centerVertical="true" 
      android:src="@drawable/filter_icon" /> 

     <RelativeLayout 
      android:id="@+id/main_activity_images_relative" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <ImageView 
       android:id="@+id/toolbar_fencity_image" 
       android:layout_width="200dp" 
       android:layout_height="match_parent" 
       android:layout_centerInParent="true" 
       android:layout_margin="@dimen/layout_padding" 
       android:src="@drawable/toolbarimg" 
       android:visibility="gone" /> 


     </RelativeLayout> 


    </RelativeLayout> 


</android.support.v7.widget.Toolbar> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical"> 

     <FrameLayout 
      android:id="@+id/main_content" 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_weight="1" 
      android:background="@android:color/transparent" /> 

     <com.bitage.carlo.fencity.ui.view.BottomMenuView 
      android:id="@+id/bottom_menu" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" /> 


    </LinearLayout> 


</RelativeLayout> 

和片段的xml：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginTop="?attr/actionBarSize" 
    android:orientation="vertical"> 

    <android.support.design.widget.AppBarLayout 
     android:id="@+id/novita_app_bar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 

     <RelativeLayout 
      android:id="@+id/novita_search_layout" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@color/background" 
      app:layout_scrollFlags="scroll|enterAlways|snap"> 

      <EditText 
       android:id="@+id/search_edit" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_margin="@dimen/layout_padding" 
       android:background="@null" 
       android:hint="@string/search" 
       android:imeOptions="actionDone" 
       android:paddingEnd="@dimen/layout_padding" 
       android:paddingLeft="@dimen/padding_start" 
       android:paddingRight="@dimen/layout_padding" 
       android:paddingStart="@dimen/padding_start" 
       android:singleLine="true" /> 

      <ImageView 
       android:id="@+id/search_image" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/layout_padding" 
       android:layout_marginStart="@dimen/layout_padding" 
       android:src="@drawable/ic_search" /> 

     </RelativeLayout> 

    </android.support.design.widget.AppBarLayout> 


    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior"> 


     <android.support.v7.widget.RecyclerView 
      android:id="@+id/places_recycler_view" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" /> 

     <ImageView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_alignParentBottom="true" 
      android:background="@android:color/transparent" 
      android:src="@drawable/nav_shadow" /> 

    </RelativeLayout> 


</android.support.design.widget.CoordinatorLayout> 

現在，我需要這個留同樣如果可能的話，只是以某種方式在t上添加滾動行爲app:layout_scrollFlags="scroll|enterAlways|snap" oolbar只在這個片段中，而來自片段的搜索仍然具有相同的行爲。

我該如何做到這一點？

Answer 1

所以，你可以做下一個：在你的片段類

，你有recyclerview。現在，你想要做的是把recyclerView.addOnScrollListener(new YourScrollListenerClass(context, toolbar, coordinatorLayout));

協調員佈局是片段之一，請記住這一點。

現在，創建一個新的類YourScrollListenerClass：

public class YourScrollListenerClass extends RecyclerView.OnScrollListener { 

     private Context mContext; 
     private Toolbar mToolbar; 
     private CoordinatorLayout mCoordinatorLayout; 
     private int mToolbarHeight; 
     private int mCoordinatorLayoutTopMargin; 

    public YourScrollListenerClass(Context context, @Nullable Toolbar toolbar, @Nullable final CoordinatorLayout mCoordinatorLayout) { 
      this.mContext = context; 
      mToolbar = toolbar; 
      this.mCoordinatorLayout = mCoordinatorLayout; 
      if (mToolbar != null && mCoordinatorLayout != null) { 
       mToolbar.post(new Runnable() { 
        @Override 
        public void run() { 
         mToolbarHeight = mToolbar.getHeight(); 
        } 
       }); 

       mCoordinatorLayout.post(new Runnable() { 
        @Override 
        public void run() { 
         mCoordinatorLayoutTopMargin = ((FrameLayout.LayoutParams) mCoordinatorLayout.getLayoutParams()).topMargin; 
        } 
       }); 
      } 
     } 

    @Override 
     public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
      if (recyclerView != null) { 
    if (mToolbar != null) { 
       float offset = mToolbar.getTranslationY() - dy; 
       if (offset <= 0 && offset >= -(mToolbar.getHeight())) { 
        mToolbar.setTranslationY(mToolbar.getTranslationY() - dy); 
        FrameLayout.LayoutParams params1 = (FrameLayout.LayoutParams) mCoordinatorLayout.getLayoutParams(); 
        params1.setMargins(0, params1.topMargin - dy, 0, 0); 
        mCoordinatorLayout.setLayoutParams(params1);     
       } 
      } 
    } 
    } 

@Override 
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) { 
     super.onScrollStateChanged(recyclerView, newState); 
     if (RecyclerView.SCROLL_STATE_IDLE == newState) {   
      if(mToolbar != null) { 
       if (Math.abs(mToolbar.getTranslationY()) <= mToolbar.getHeight()/2) { 
        ObjectAnimator animator = ObjectAnimator.ofFloat(mToolbar, View.TRANSLATION_Y, mToolbar.getTranslationY(), 0); 
        animator.setDuration(300); 
        animator.start(); 
        MarginAnimation animation = new MarginAnimation(mCoordinatorLayout, ((FrameLayout.LayoutParams) mCoordinatorLayout.getLayoutParams()).topMargin, mCoordinatorLayoutTopMargin); 
        mCoordinatorLayout.startAnimation(animation); 
       } else { 
        ObjectAnimator animator = ObjectAnimator.ofFloat(mToolbar, View.TRANSLATION_Y, mToolbar.getTranslationY(), -mToolbarHeight); 
        animator.setDuration(300); 
        animator.start(); 
        MarginAnimation animation = new MarginAnimation(mCoordinatorLayout, ((FrameLayout.LayoutParams) mCoordinatorLayout.getLayoutParams()).topMargin, 0); 
        mCoordinatorLayout.startAnimation(animation); 
       } 
      } 
     } 
    } 

    } 

而對於保證金的動畫，創建新類

public class MarginAnimation extends Animation { 

    private View mView; 
    private float mToMargin; 
    private float mFromMargin; 
    private Context mContext; 

    public MarginAnimation(View v, float fromTop, float toTop) { 
     mFromMargin = fromTop; 
     mToMargin = toTop; 
     mView = v; 
     setDuration(300); 
    } 

    @Override 
    protected void applyTransformation(float interpolatedTime, Transformation t) { 
     float topMargin = (mToMargin - mFromMargin) * interpolatedTime + mFromMargin; 
     Log.d("TopMargin", String.valueOf(topMargin)); 
     FrameLayout.LayoutParams p = (FrameLayout.LayoutParams) mView.getLayoutParams(); 
     p.setMargins(0, (int) topMargin, 0, 0); 
     mView.setLayoutParams(p); 
     mView.requestLayout(); 
    } 

    @Override 
    public void initialize(int width, int height, int parentWidth, int parentHeight) { 
     super.initialize(width, height, parentWidth, parentHeight); 
    } 

    @Override 
    public boolean willChangeBounds() { 
     return true; 
    } 
} 

希望這有助於...