NavigationDrawer：设置抽屉监听器时，抽屉图标上不再有动画

Question

如果你用android studio创建一个带有导航抽屉的项目，当你打开/关闭抽屉时，抽屉图标会有一个流畅的动画。

如果我在抽屉布局中添加抽屉监听器，则抽屉图标不再变化：

DrawerLayout dl = (DrawerLayout) findViewById(R.id.drawer_layout);
    dl.setDrawerListener(new ActionBarDrawerToggle(this, dl,R.drawable.ic_drawer,R.string.navigation_drawer_open,R.string.navigation_drawer_close));

我试图重写 ActionBarDrawerToggle 的方法来添加对 syncState() 的调用。

   DrawerLayout dl = (DrawerLayout)findViewById(R.id.drawer_layout);

    mDrawerToggle = new ActionBarDrawerToggle(this, dl,
            R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {

        @Override
        public void onDrawerSlide(View drawerView, float slideOffset) {
            super.onDrawerSlide(drawerView, slideOffset);
            mDrawerToggle.syncState();
        }

        @Override
        public void onDrawerStateChanged(int newState) {
            super.onDrawerStateChanged(newState);
            mDrawerToggle.syncState();
        }

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

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            mDrawerToggle.syncState();
        }
    };
    dl.setDrawerListener(mDrawerToggle);

现在，当抽屉打开时，我有一个小图标，然后在抽屉关闭时切换为大图标，但我没有流畅的动画。

有人知道如何获得流畅的动画吗？

Answer 1

尝试将最后两个侦听器缺少的@Override 注释放入并删除所有syncState() 调用。从 Activity 的 onPostCreate 调用 syncState()：

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    mDrawerToggle.syncState();
}

Answer 2

我也遇到了同样的问题。这个问题已经很久没有问过了，如果你还有兴趣，这里是我的回答。

放

invalidateOptionsMenu(); 

而不是

syncstate();

for onDrawerClosed(), onDrawerOpened(), onDrawerSlide(), onDrawerStateChanged()

还有，放

@Override

protected void onPostCreate(Bundle savedInstanceState){

        super.onPostCreate(savedInstanceState);

        mDrawerToggle.syncState();
}

@Override

public void onConfigurationChanged(Configuration newConfig) {

        super.onConfigurationChanged(newConfig);

        mDrawerToggle.onConfigurationChanged(newConfig);
}

Answer 3

将布尔值设置为 false..private boolean isDrawerOpen = false;

public void onDrawerSlide(View drawerView, float slideOffset) {
            if(slideOffset > .55 && !isDrawerOpen){
                super.onDrawerSlide(drawerView, 1);
                onDrawerOpened(drawerView);
                isDrawerOpen = true;
            } else if(slideOffset < .45 && isDrawerOpen) {
                super.onDrawerSlide(drawerView,slideOffset);
                onDrawerClosed(drawerView);
                isDrawerOpen = false;
            }
        }

        public void onDrawerClosed(View view) {
            getActionBar().setTitle("Your title");
            invalidateOptionsMenu();
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle("your title");
            invalidateOptionsMenu();
        }
    };