布局展开动画

Question

我用下面的代码完成了布局展开动画。当我们通过单击文本视图来调用动画时，它可以正常工作，但是当我尝试通过单击布局来尝试这样做时，情况并未发生。任何人都可以帮我解决这个问题吗？

LinearLayout hello= (LinearLayout)findViewById(R.id.lin_hello); 
final RelativeLayout rel=(RelativeLayout)findViewById(R.id.rel_nah_hide); 
hello.setOnClickListener(new OnClickListener() {   
    @Override 
    public void onClick(View v) { 
     expand=!expand; 
     Animation a=expand(rel, expand); 
     rel.setAnimation(a); 
     a.start(); 
    } 
}); 

public static Animation expand(final View v, final boolean expand) { 
    try { 
     Method m = v.getClass().getDeclaredMethod("onMeasure", int.class, int.class); 
     m.setAccessible(true); 
     m.invoke(v, 
       MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 
       MeasureSpec.makeMeasureSpec(((View)v.getParent()).getMeasuredWidth(), MeasureSpec.AT_MOST) 
     ); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    final int initialHeight = v.getMeasuredHeight(); 

    if (expand) { 
     v.getLayoutParams().height = 0; 
    } else { 
     v.getLayoutParams().height = initialHeight; 
    } 
    v.setVisibility(View.VISIBLE); 

    Animation a = new Animation() { 
     @Override 
     protected void applyTransformation(float interpolatedTime, Transformation t) { 
      int newHeight = 0; 
      if (expand) { 
       newHeight = (int) (initialHeight * interpolatedTime); 
      } else { 
       newHeight = (int) (initialHeight * (1 - interpolatedTime)); 
      } 
      v.getLayoutParams().height = newHeight; 
      v.requestLayout(); 

      if (interpolatedTime == 1 && !expand) 
       v.setVisibility(View.GONE); 
     } 

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

    a.setDuration(SPEED_ANIMATION_TRANSITION); 
    a.setAnimationListener(new AnimationListener(){ 
     @Override 
     public void onAnimationEnd(Animation arg0) { 
      animWorkingFlag=false; 
     } 

     @Override 
     public void onAnimationRepeat(Animation animation) { 
      // TODO Auto-generated method stub 
     } 

     @Override 
     public void onAnimationStart(Animation animation) { 
      animWorkingFlag=true; 
     } 
    }); 

    return a; 
} 

和以下是XML布局，

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 
    <LinearLayout 
     android:id="@+id/lin_hello" 
     android:layout_height="50dp" 
     android:layout_width="fill_parent" 
     android:orientation="vertical"> 
     <TextView 
      android:id="@+id/hello" 
      android:layout_height="50dp" 
      android:layout_width="fill_parent" 
      android:text="Nah" 
      android:gravity="center" 
      android:background="#F03535"/> 
    </LinearLayout> 

    <RelativeLayout 
     android:id="@+id/rel_nah_hide" 
     android:layout_height="wrap_content" 
     android:layout_width="fill_parent"> 
     <TextView 
      android:id="@+id/txt_nah_hide1" 
      android:layout_height="50dp" 
      android:layout_width="fill_parent" 
      android:text="Incorrect Name/Address" 
      android:gravity="center" 
      android:textColor="@color/white"/> 
     <TextView 
      android:id="@+id/txt_nah_hide2" 
      android:layout_height="50dp" 
      android:layout_width="fill_parent" 
      android:text="Venue is closed" 
      android:gravity="center" 
      android:textColor="@color/white" 
      android:layout_below="@id/txt_nah_hide1"/> 
     <TextView 
      android:id="@+id/txt_nah_hide3" 
      android:layout_height="50dp" 
      android:layout_width="fill_parent" 
      android:text="Venue is duplicate" 
      android:gravity="center" 
      android:textColor="@color/white" 
      android:layout_below="@id/txt_nah_hide2"/> 
    </RelativeLayout> 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:textSize="28dp" 
     android:text="heelo2222"/> 
</LinearLayout> 

Answer 1

使用下一部分代码： - >

View hello= findViewById(R.id.lin_hello); 
final RelativeLayout rel=(RelativeLayout)findViewById(R.id.rel_nah_hide); 
hello.setOnClickListener(new OnClickListener() {   
    @Override 
    public void onClick(View v) { 
     expand=!expand; 
     Animation a=expand(rel, expand); 
     rel.setAnimation(a); 
     a.start(); 
    } 
});