Nicht gezeigt TextView nach der Einstellung VISIBLE von GONE in der Animation

Question

versucht, LinarLayout von GONE-Zustand zu VISIBLE mit "Roll-down" -Animation zu zeigen. Auf diesem Layout existiert TextView. Scheint alles gut zu funktionieren, aber ein TextView wird nach der Animation nicht angezeigt. Was mache ich falsch?

 <LinearLayout 
      android:orientation="vertical" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:visibility="gone" 
      android:id="@+id/ll_info"> 
      <TextView 
       android:id="@+id/bayer_note" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="20dp" 
       android:layout_marginRight="20dp" 
       android:layout_marginTop="10dp" 
       android:layout_marginBottom="10dp" 
       android:text="@string/buyer_note"/> 
      <RelativeLayout 
       android:id="@+id/button_continue" 
       android:layout_width="match_parent" 
       android:layout_height="54dp" 
       android:layout_centerHorizontal="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:background="@drawable/button_register" 
       android:drawableEnd="@drawable/ic_arrow_forward_white_24dp"> 

       <TextView 
        android:id="@+id/btn_cont_caption" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_vertical" 
        android:text="Войти" 
        android:textColor="@android:color/white" 
        android:textSize="20sp" 
        android:fontFamily="fonts/SF-UI-Display-Regular.ttf" 
        android:layout_centerInParent="true" /> 

       <ImageView 
        android:layout_width="25dp" 
        android:layout_height="25dp" 
        android:id="@+id/imageView" 
        android:layout_centerVertical="true" 
        android:layout_alignParentEnd="false" 
        android:src="@drawable/ic_door" 
        android:layout_toRightOf="@+id/btn_cont_caption" 
        android:layout_marginLeft="10dp" 
        android:scaleType="fitCenter" /> 
      </RelativeLayout> 
     </LinearLayout> 

und Animationscode:

final LinearLayout ll_info = (LinearLayout)findViewById(R.id.ll_info); 

     class scaleAnimation extends Animation { 
        public LinearLayout ll; 
        public int newHeight; 

        public void scaleTopHeight(int height) 
        { 
         newHeight = height; 
        } 

        public void setLayout(LinearLayout layout) { 
         ll = layout; 
        } 
       } 

       final LinearLayout ll_info = (LinearLayout)findViewById(R.id.ll_info); 

       scaleAnimation h = new scaleAnimation() { 
        @Override 
        protected void applyTransformation(float interpolatedTime, Transformation t) { 
         ll.getLayoutParams().height = interpolatedTime == 1 
           ? LinearLayout.LayoutParams.WRAP_CONTENT 
           : (int)(newHeight * interpolatedTime); 
         ll.requestLayout(); 
        } 
       }; 
       h.setDuration(300); 
       h.setLayout(ll_info); 
     ll_info.setVisibility(View.VISIBLE); 
       ll_info.measure(View.MeasureSpec.makeMeasureSpec(((LinearLayout)ll_info.getParent()).getWidth(), View.MeasureSpec.AT_MOST), View.MeasureSpec.makeMeasureSpec(((LinearLayout)ll_info.getParent()).getHeight(), View.MeasureSpec.AT_MOST)); 
       h.scaleTopHeight(ll_info.getMeasuredHeight()); 
     ll_info.getLayoutParams().height=1; 
       ll_info.startAnimation(h); 

Answer 1

<RelativeLayout 
      android:id="@+id/button_continue" 
      android:layout_width="match_parent" 
      android:layout_height="54dp" 

      **android:layout_centerHorizontal="true"** ///// 

entfernen diesem

  android:layout_marginLeft="@dimen/activity_horizontal_margin" 
      android:layout_marginRight="@dimen/activity_horizontal_margin" 
      android:background="@drawable/button_register" 
      android:drawableEnd="@drawable/ic_arrow_forward_white_24dp"> 

      <TextView 
       android:id="@+id/btn_cont_caption" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center_vertical" 
       android:text="Войти" 
       android:textColor="@android:color/white" 
       android:textSize="20sp" 
       android:fontFamily="fonts/SF-UI-Display-Regular.ttf" 
       android:layout_centerInParent="true" /> 

      <ImageView 
       android:layout_width="25dp" 
       android:layout_height="25dp" 
       android:id="@+id/imageView" 
       android:layout_centerVertical="true" 
       android:layout_alignParentEnd="false" 
       android:src="@drawable/ic_door" 
       android:layout_toRightOf="@+id/btn_cont_caption" 
       android:layout_marginLeft="10dp" 
       android:scaleType="fitCenter" /> 
     </RelativeLayout> 

i t Dies ist das Problem Ihrer XML-Datei, Ihr relativer Layout in center_horizontal und alle Childs sind in der Mitte in parent.so Textansicht verbirgt sich über Bildansicht. Probieren Sie es aus und lassen Sie es mich wissen.