Android中Fragment之间切换我们是可以对其进行添加动画，而且进行设置也是非常简单，但是在设置动画的过程中有一些需要注意的地方后面会慢慢说出来

• 这里我直接贴出Fragment切换的方法上面有注释

public static void showFragment(int index, int state) {
        // 想要显示fragment,先隐藏所有fragment，防止重叠
        mineChangestate = state;
        marketChangestate = state;
        FragmentTransaction ft = manager.beginTransaction();
    //fragment的切换动画
        if(index ==0 && last_index ==0){
            ft.setCustomAnimations(R.anim.fragmen_left, 0);
        }
        if(index != last_index) {
            if (index - last_index > 0) {
                ft.setCustomAnimations(R.anim.fragmen_left, 0);
            } else if (index - last_index < 0) {
                ft.setCustomAnimations(R.anim.fragment_right, 0);
            }
        }
        hideFragments(ft);
        switch (index) {
            case 1:
                //判断是否点击推荐按钮
                // 如果fragment1已经存在则将其显示出
                last_index =1;
                if (fragment1 != null) {
                    if (marketChangestate == 1) {
                        ft.remove(fragment1);
                        fragment1 = new RecommendFragment();
                        ft.add(R.id.main_framelayout, fragment1);
                        marketChangestate = 0;
                    }
                    ft.show(fragment1);
                    // 否则是切换则添加fragment1，注意添加后是会显示出来的，replace方法也是先remove后add
                } else {
                    fragment1 = new RecommendFragment();
                    ft.add(R.id.main_framelayout, fragment1);
                }
                break;
            case 2:
                //是否点击理财按钮
                last_index =2;
                if (fragment2 != null) {
                    if (marketChangestate == 1) {
                        ft.remove(fragment2);
                        fragment2 = new MarketFragment();
                        ft.add(R.id.main_framelayout, fragment2);
                        marketChangestate = 0;
                    }
                    ft.show(fragment2);

                } else {
                    fragment2 = new MarketFragment();
                    ft.add(R.id.main_framelayout, fragment2);
                }
                break;
            case 3:
                //是否点击我的按钮
                last_index =3;
                if (fragment3 != null) {
                    if (mineChangestate == 1) {
                        ft.remove(fragment3);
                        fragment3 = new MineFragment();
                        ft.add(R.id.main_framelayout, fragment3);
                        mineChangestate = 0;
                    }
                    ft.show(fragment3);

                } else {
                    fragment3 = new MineFragment();
                    ft.add(R.id.main_framelayout, fragment3);
                }
                break;

        }

        ft.commitAllowingStateLoss();
    }

上面那么多代码，其实设置Fragment切换动画的只有一句代码，下面就是设置Fragment的动画

ft.setCustomAnimations(R.anim.fragmen_left, 0);

但是需要注意的是在设置动画的时候一定要在Fragment show之前进行设置否则该动画就不会起作用

下面在贴出动画代码，我设置的动画是平移动画

代码路径res/anim/fragmen_left.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

    <translate android:fromXDelta="-100%p"
        android:toXDelta="0"
        android:duration="400"/>
</set>