超简单实现Google+列表特效-CFANZ编程社区

相信用过Google+的人都感到其应用的特效相当棒，本文将以超简单的形式来实现类似Google+列表的特效。仅仅写几行代码就可以实现奥。

特效真面目

由于众所周知的原因，很多人无法使用Google+应用。所以有必要让大家先看一看真面目。

P.S.找了很多的屏目录制软件都不行，并且没有4.4的机器，所以只能用最笨的方法录制了，请见谅哈。

特效动画

from_bottom_to_top.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/decelerate_interpolator" android:shareInterpolator="true"> <translate android:fromXDelta="0%" android:toXDelta="0%" android:fromYDelta="100%" android:toYDelta="0%" android:duration="400" /> </set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator"
    android:shareInterpolator="true">
    <translate
        android:fromXDelta="0%" android:toXDelta="0%"
        android:fromYDelta="100%" android:toYDelta="0%"
        android:duration="400" />
</set>

from_top_to_bottom.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/decelerate_interpolator" android:shareInterpolator="true"> <translate android:fromXDelta="0%" android:toXDelta="0%" android:fromYDelta="-100%" android:toYDelta="0%" android:duration="400" /> </set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator"
    android:shareInterpolator="true">
    <translate
        android:fromXDelta="0%" android:toXDelta="0%"
        android:fromYDelta="-100%" android:toYDelta="0%"
        android:duration="400" />
</set>

加入动画

private int mLastPosition = -1; @Override public View getView(int position, View convertView, ViewGroup parent) { View view = super.getView(position, convertView, parent); int animResId; if (position > mLastPosition) { animResId = R.anim.from_bottom_to_top; } else { animResId = R.anim.from_top_to_bottom; } Animation animation = AnimationUtils.loadAnimation(getContext(), animResId); view.startAnimation(animation); mLastPosition = position; return view; }

private int mLastPosition = -1;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
  View view = super.getView(position, convertView, parent);
  int animResId;
  if (position > mLastPosition) {
      animResId = R.anim.from_bottom_to_top;
  } else {
      animResId = R.anim.from_top_to_bottom;
  }
          
  Animation animation = AnimationUtils.loadAnimation(getContext(), animResId);
  view.startAnimation(animation);
  mLastPosition = position;
  return view;
}

其他

精彩绝伦的Android UI设计
精通Android 3