似乎没有一种简单的方法通过API来做到这一点，因为动画只是改变视图的渲染矩阵，而不是实际的大小。但是我们可以设置一个负边距来愚弄LinearLayout，认为视图越来越小。
所以我建议创建你自己的Animation类，基于ScaleAnimation，并重写“applyTransformation”方法来设置新的边距和更新布局。喜欢这个…
public class Q2634073 extends Activity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.q2634073);
findViewById(R.id.item1).setOnClickListener(this);
}
@Override
public void onClick(View view) {
view.startAnimation(new MyScaler(1.0f, 1.0f, 1.0f, 0.0f, 500, view, true));
}
public class MyScaler extends ScaleAnimation {
private View mView;
private LayoutParams mLayoutParams;
private int mMarginBottomFromY, mMarginBottomToY;
private boolean mVanishAfter = false;
public MyScaler(float fromX, float toX, float fromY, float toY, int duration, View view,
boolean vanishAfter) {
super(fromX, toX, fromY, toY);
setDuration(duration);
mView = view;
mVanishAfter = vanishAfter;
mLayoutParams = (LayoutParams) view.getLayoutParams();
int height = mView.getHeight();
mMarginBottomFromY = (int) (height * fromY) + mLayoutParams.bottomMargin - height;
mMarginBottomToY = (int) (0 - ((height * toY) + mLayoutParams.bottomMargin)) - height;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
int newMarginBottom = mMarginBottomFromY
+ (int) ((mMarginBottomToY - mMarginBottomFromY) * interpolatedTime);
mLayoutParams.setMargins(mLayoutParams.leftMargin, mLayoutParams.topMargin,
mLayoutParams.rightMargin, newMarginBottom);
mView.getParent().requestLayout();
} else if (mVanishAfter) {
mView.setVisibility(View.GONE);
}
}
}
}
通常的警告适用：因为我们覆盖一个受保护的方法(applyTransformation)，这不能保证在未来的Android版本中工作。
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