动画抽屉图标变成箭头setDisplayHomeAsUpEnabled？ [英] Animate drawer icon into arrow on setDisplayHomeAsUpEnabled?

问题描述

我使用setDisplayHomeAsUpEnabled为了显示箭头，而不是抽屉汉堡包的图标，但它没有得到动画或任何东西。相反，它显示了箭头绘制瞬间。

I'm using setDisplayHomeAsUpEnabled in order to show the arrow instead of the drawer "burger" icon but it's not getting animated or anything. Instead it shows the arrow drawable instantaneously.

主屏幕：（相册1）

当你点击一个电影：（相册2）

关键是，该图标也动画就好了，当我将抽屉，这让我觉得，也许我不应该使用setDisplayHomeAsUpEnabled此：（相册3）

The thing is, the icon does the animation just fine when I slide the drawer, which makes me think that maybe I'm not supposed to use setDisplayHomeAsUpEnabled for this: (Album 3)

专辑： http://imgur.com/a/LkXbh

下面是我的抽屉里拨动code：

Here's my drawer toggle code:

    Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
    setSupportActionBar(toolbar);

    drawerAdapter = new DrawerAdapter(this, App.getNavItems(), getSupportFragmentManager());
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawerList = (ExpandableListView) findViewById(R.id.left_drawer);

    // Set onGroupClick and onChildClick
    drawerAdapter.setClickEvents(MainActivity.this, drawerLayout, drawerList);
    drawerList.setAdapter(drawerAdapter);

    ActionBarDrawerToggle toolbarDrawerToggle = new ActionBarDrawerToggle(
            this,                 
            drawerLayout,        
            toolbar,             
            R.string.drawer_open, 
            R.string.drawer_close 
    ) {

        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            invalidateOptionsMenu();
        }

        public void onDrawerOpened(View view) {
            super.onDrawerOpened(view);
            invalidateOptionsMenu();
        }
    };
    drawerLayout.setDrawerListener(toolbarDrawerToggle);
    toolbarDrawerToggle.syncState();

编辑：我希望动画没有打开抽屉时，该工作了。 我想手动触发动画，当我打开一个特定的片段。我可能没有正确地解释自己。

I want the animation not when opening the drawer, that works already. I would like to manually trigger the animation when I load a specific fragment. I may not have explained myself correctly.

推荐答案

我没有测试过这一点，但你可以通过在0动画花车来实现这一（抽屉关闭）和1（抽屉打开），然后值传递到 ActionBarDrawerToggle.onDrawerSlide（查看和float）。我相信这是如何切换决定了国家的动画切换应该是

I haven't tested this, but you may be able to achieve this by animating a float between 0 (drawer closed) and 1 (drawer open) and then passing the value into ActionBarDrawerToggle.onDrawerSlide(View, float). I believe that's how the toggle determines what state the animated toggle should be in.

这样的事情应该工作。

ValueAnimator anim = ValueAnimator.ofFloat(start, end);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator valueAnimator) {
        float slideOffset = (Float) valueAnimator.getAnimatedValue();
        toolbarDrawerToggle.onDrawerSlide(drawerLayout, slideOffset);
    }
});
anim.setInterpolator(new DecelerateInterpolator());
// You can change this duration to more closely match that of the default animation.
anim.setDuration(500);
anim.start();

这篇关于动画抽屉图标变成箭头setDisplayHomeAsUpEnabled？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！