Resizing layouts programmatically (as animation)

Question

I want to resize some layouts in my Activity.

Here is the code of the main XML:

<LinearLayout     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:layout_weight="1"     android:orientation="vertical" >      <LinearLayout         android:id="@+id/top"         android:layout_width="fill_parent"         android:layout_height="0dip"         android:layout_weight="1"         android:background="#3ee3e3" >     </LinearLayout>      <LinearLayout         android:id="@+id/middle"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:layout_weight="1">     </LinearLayout>      <LinearLayout         android:id="@+id/bottom"         android:layout_width="fill_parent"         android:layout_height="0dip"         android:layout_weight="1"         android:background="#fe51e6" >     </LinearLayout> </LinearLayout> 

As you can see, the top and bottom layouts height's is 0, and the middle layout covers all the place.

I want to programmatically decrease the middle layout size, while increase both the top and the bottom layout sizes, till all the layouts have the same height.

I want it to be look like an animation.

How should I do that?

Thanks

Answer 1

I wrote a ResizeAnimation for a similar purpose. It's simple but costly.

Java

    /**      * an animation for resizing the view.      */     public class ResizeAnimation extends Animation {         private View mView;         private float mToHeight;         private float mFromHeight;          private float mToWidth;         private float mFromWidth;          public ResizeAnimation(View v, float fromWidth, float fromHeight, float toWidth, float toHeight) {             mToHeight = toHeight;             mToWidth = toWidth;             mFromHeight = fromHeight;             mFromWidth = fromWidth;             mView = v;             setDuration(300);         }          @Override         protected void applyTransformation(float interpolatedTime, Transformation t) {             float height =                     (mToHeight - mFromHeight) * interpolatedTime + mFromHeight;             float width = (mToWidth - mFromWidth) * interpolatedTime + mFromWidth;             LayoutParams p = mView.getLayoutParams();             p.height = (int) height;             p.width = (int) width;             mView.requestLayout();         }     } 

Kotlin

class ResizeAnimation(     private val view: View,     private val toHeight: Float,     private val fromHeight: Float,     private val toWidth: Float,     private val fromWidth: Float,     duration: Long ) : Animation() {      init {         this.duration = duration     }      override fun applyTransformation(         interpolatedTime: Float,         t: Transformation?     ) {         val height = (toHeight - fromHeight) * interpolatedTime + fromHeight         val width = (toWidth - fromWidth) * interpolatedTime + fromWidth         val layoutParams = view.layoutParams         layoutParams.height = height.toInt()         layoutParams.width = width.toInt()         view.requestLayout()     } }