Android 多个Fragment切换动画

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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>

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