1 //        sa = new ScaleAnimation(0, 1, 0, 1,100,50); 2 //        sa = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f) 3 //        sa.setDuration(1000); 4          5         findViewById(R.id.btnScaleMe).setOnClickListener(new View.OnClickListener() { 6             @Override 7             public void onClick(View arg0) { 8                 arg0.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.sa)); 9             }10         });

 1 <?xml version="1.0" encoding="utf-8"?> 2 <scale xmlns:android="http://schemas.android.com/apk/res/android" 3     android:fromXScale="0" 4     android:toXScale="1" 5     android:fromYScale="0" 6     android:toYScale="1" 7     android:duration="1000" 8     android:pivotX="50%" 9     android:pivotY="50%" >10 11 </scale>