抽屉式导航栏图标（ic_drawer）不显示 [英] Navigation Drawer Icon (ic_drawer) not showing

问题描述

我在执行导航抽屉我的应用程序。现在它完美，除了一个小故障。当我设置的抽屉式导航图标（ic_drawer）来代替普通的HomeAsUp插入符号图标，我仍然得到箭头。资产净值抽屉图标不显示。我已经实现每一个是在Android开发者网站的方法。但它似乎并没有工作。

下面是我的code：

  DrawerLayout mDrawerLayout;
的FrameLayout leftDrawer，rightDrawer，contentFrame;
ActionBarDrawerToggle mDrawerToggle;

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_home）;
    initializeViews（）;
}

私人无效initializeViews（）{
    // TODO自动生成方法存根
    mDrawerLayout =（DrawerLayout）findViewById（R.id.mDrawerLayout）;
    mDrawerToggle =新ActionBarDrawerToggle（这一点，
            mDrawerLayout，R.drawable.ic_drawer，
            R.string.drawer_open_content_desc，
            R.string.drawer_close_content_desc）;

    getActionBar（）setHomeButtonEnabled（真）。
    getActionBar（）setDisplayHomeAsUpEnabled（真）。

    mDrawerLayout.setDrawerListener（mDrawerToggle）;

    leftDrawer =（的FrameLayout）findViewById（R.id.drawerLeft_frame）;
    rightDrawer =（的FrameLayout）findViewById（R.id.drawerRight_frame）;
    contentFrame =（的FrameLayout）findViewById（R.id.content_frame）;
}


@覆盖
保护无效onPostCreate（包savedInstanceState）{
    // TODO自动生成方法存根
    super.onPostCreate（savedInstanceState）;
    mDrawerToggle.syncState（）;
}

@覆盖
公共无效onConfigurationChanged（配置NEWCONFIG）{
    // TODO自动生成方法存根
    super.onConfigurationChanged（NEWCONFIG）;
    mDrawerToggle.onConfigurationChanged（NEWCONFIG）;
}

@覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
    //充气菜单;这增加了项目操作栏，如果它是present。
    。getMenuInflater（）膨胀（R.menu.home，菜单）;
    返回true;
}

@覆盖
公共布尔onOptionsItemSelected（菜单项项）{
    // TODO自动生成方法存根
    如果（mDrawerToggle.onOptionsItemSelected（项目））{
        返回true;
    }
    返回super.onOptionsItemSelected（项目）;
}
 

解决方案

我知道这是相当晚来回答这个但这将帮助别人ATLEAST。

您也许应该补充的code这些行表明，导航图标。

  @覆盖
保护无效onPostCreate（包savedInstanceState）{
    super.onPostCreate（savedInstanceState）;
    //同步发生onRestoreInstanceState后切换状态。
    mDrawerToggle.syncState（）;
}

@覆盖
公共无效onConfigurationChanged（配置NEWCONFIG）{
    super.onConfigurationChanged（NEWCONFIG）;
    mDrawerToggle.onConfigurationChanged（NEWCONFIG）;
}
 

I am implementing a navigation drawer for my app. Now it works perfectly except for one small glitch. When I set the Navigation Drawer Icon (ic_drawer) to replace the regular "HomeAsUp" caret icon, I still get the arrow. The Nav Drawer icon does not show. I have implemented every method that was on the android developers website. But it doesn't seem to work.

Below is my code:

DrawerLayout mDrawerLayout;
FrameLayout leftDrawer, rightDrawer, contentFrame;
ActionBarDrawerToggle mDrawerToggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    initializeViews();
}

private void initializeViews() {
    // TODO Auto-generated method stub
    mDrawerLayout = (DrawerLayout) findViewById(R.id.mDrawerLayout);
    mDrawerToggle = new ActionBarDrawerToggle(this,
            mDrawerLayout, R.drawable.ic_drawer,
            R.string.drawer_open_content_desc,
            R.string.drawer_close_content_desc);

    getActionBar().setHomeButtonEnabled(true);
    getActionBar().setDisplayHomeAsUpEnabled(true);

    mDrawerLayout.setDrawerListener(mDrawerToggle);

    leftDrawer = (FrameLayout) findViewById(R.id.drawerLeft_frame);
    rightDrawer = (FrameLayout) findViewById(R.id.drawerRight_frame);
    contentFrame = (FrameLayout) findViewById(R.id.content_frame);
}


@Override
protected void onPostCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onPostCreate(savedInstanceState);
    mDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    // TODO Auto-generated method stub
    super.onConfigurationChanged(newConfig);
    mDrawerToggle.onConfigurationChanged(newConfig);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.home, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

解决方案

I know it is quite late to answer this but this would help someone atleast.

You should probably add these lines of code to show that navigation icon.

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

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    mDrawerToggle.onConfigurationChanged(newConfig);
}

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