android - 为什么单击我的导航图标时我的 NavDrawer 没有打开？

Question

我使用自定义导航图标，所以我需要 drawerToggle.setDrawerIndicatorEnabled(false);。但是现在，单击我的自定义图标时，我的 Navdrawer 不会打开。

有什么想法可以实现吗？我还需要 ActionBarDrawerToggle 吗？

public void setUpActionBar() {
    actionBar = (Toolbar) findViewById(R.id.custom_screen_toolbar);
    setSupportActionBar(actionBar);

    actionBar.setBackgroundResource(R.drawable.divider_action_bar);
    actionBar.setNavigationIcon(R.drawable.action_bar_menu);

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

    drawerToggle = new ActionBarDrawerToggle(this, /* host Activity */
    drawerLayout, /* DrawerLayout object */
    actionBar, /* custom action bar */
    R.string.drawer_open, /* "open drawer" description */
    R.string.drawer_close /* "close drawer" description */
    ) {

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
        }

        @Override
        public void onDrawerSlide(View drawerView, float slideOffset) {
            super.onDrawerSlide(drawerView, 0);
        }

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

    drawerLayout.setDrawerListener(drawerToggle);
    drawerToggle.setDrawerIndicatorEnabled(false);
    drawerToggle.syncState();
}

我还尝试使用 drawerToggle.setHomeAsUpIndicator(R.drawable.icon); 这样我就可以在不使用操作栏中的 setNavigationIcon 的情况下更改图标，但是它不会更改图标。

Answer 1

如果您调用 drawerToggle.setHomeAsUpIndicator(R.drawable.icon); 和 drawerToggle.setDrawerIndicatorEnabled(false); 然后它会运行

public void setHomeAsUpIndicator(Drawable indicator) {
        if(indicator == null) {
            this.mHomeAsUpIndicator = this.getThemeUpIndicator();
            this.mHasCustomUpIndicator = false;
        } else {
            this.mHomeAsUpIndicator = indicator;
            this.mHasCustomUpIndicator = true;
        }

        if(!this.mDrawerIndicatorEnabled) {
            this.setActionBarUpIndicator(this.mHomeAsUpIndicator, 0);
        }

和

public void setDrawerIndicatorEnabled(boolean enable) {
        if(enable != this.mDrawerIndicatorEnabled) {//if you set enable be "false", below sentences do not run, because the default value of mDrawerIndicatorEnabled is false 
            if(enable) {
                this.setActionBarUpIndicator((Drawable)this.mSlider, this.mDrawerLayout.isDrawerOpen(8388611)?this.mCloseDrawerContentDescRes:this.mOpenDrawerContentDescRes);
            } else {
                this.setActionBarUpIndicator(this.mHomeAsUpIndicator, 0);
            }

            this.mDrawerIndicatorEnabled = enable;
        }

    }

虽然你调用了setHomeAsUpIndicator(Drawable indicator)，但是因为mDrawerIndicatorEnabled为false，所以它不会改变图标。(但是如果你先调用setDrawerIndicatorEnabled再调用setHomeAsUpIndicator 你也可以改变图标)。

如果你调用toolbar.setNavigationIcon(R.mipmap.ic_launcher);，图标会改变，因为它会调用ActionBarDrawerToggle.java中的setActionBarUpIndicator 。您将看到工具栏将为其导航图标设置此可绘制对象。

public void setActionBarUpIndicator(Drawable upDrawable, int contentDescRes) {
            this.mToolbar.setNavigationIcon(upDrawable);
            this.mToolbar.setNavigationContentDescription(contentDescRes);
        }

如果你想通过点击打开抽屉菜单，你应该为这个'navigationIcon'设置一个点击监听器，因为在你调用这个之后，系统不会帮你做这个。