导航抽屉图标(ic_drawer)未显示

我正在为我的应用实现导航抽屉.现在除了一个小故障外它完美无缺.当我设置导航抽屉图标(ic_drawer)来替换常规的"HomeAsUp"插入符号图标时,我仍然得到箭头.导航抽屉图标不显示.我已经实现了android开发者网站上的每个方法.但它似乎没有用.

以下是我的代码:

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);
}

Naveen Kumar.. 45

我知道现在回答这个问题已经很晚了,但这对任何人都有帮助.

您应该添加这些代码行来显示导航图标.

@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);
}

在我的情况下,这就是我所缺少的.谢谢.AndroidManifest中不需要元数据.接受的答案是不正确的. (2认同)

Filipe Brito.. 20

只需将此代码放在styles.xml文件中:

@drawable/ic_drawer
@drawable/ic_drawer

我有同样的问题,这对我有用.

编辑

以编程方式,您可以设置: getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_drawer);