小编Emm*_*nce的帖子

我尝试更改项目导航视图菜单的颜色:

styles.xml

<item name="android:activatedBackgroundIndicator">@drawable/activated_background</item>

activated_background.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/White" />
    <item android:state_focused="true" android:drawable="@color/White" />
    <item android:state_activated="true" android:drawable="@color/White" />
    <item android:drawable="@android:color/transparent" />
</selector>

drawer.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android">

<group
    android:id="@+id/group_1">
    <item
        android:id="@+id/drawer_menu_account"
        android:checked="false"
        android:title="@string/menu_account"
        android:icon="@drawable/ic_account_grey600_24dp" />
    <item
        android:id="@+id/drawer_menu_my_post"
        android:checked="false"
        android:title="@string/menu_my_post"
        android:icon="@drawable/ic_pin_grey600_24dp" />
</group>
[...]

背景颜色不改变..我做错了什么？

如何将Elevation设置为0或为我的特定片段禁用它NavigationDrawer？可能以编程方式或主题？

toolbar.setElevation(0) 似乎不起作用.

这不是我的onNavigationItemSelected工作,海拔不会改变:

if (item.getItemId() == R.id.drawer_menu_account) {
    if (getSupportActionBar() != null) {
        getSupportActionBar().setElevation(0);
    }
} else {
    if (getSupportActionBar() != null) {
        getSupportActionBar().setElevation(8);
    }
}

我的协调员布局有工具栏

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".activity.MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<FrameLayout
    android:id="@+id/content_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="?attr/actionBarSize" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@drawable/ic_add_24dp" />

</android.support.design.widget.CoordinatorLayout>

已解决 - 感谢Amir!在我的工作中使用它onNavigationItemSelected

if (android.os.Build.VERSION.SDK_INT >= 21) {
    if …

当我在活动B中的回调完成时,如何在活动A(coordinatorLayout在这里)中显示snackbar ？Snackbar需要我的coordinatorLayout,但我无法从Activity B中提供它.

活动B:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if(id == android.R.id.home) {
        this.finish();
        return true;
    } else if(id == R.id.action_add) {
        callAddObject();
        this.finish();
        return true;
    }

    return super.onOptionsItemSelected(item);
}

public void callAddObject() {
    [...]
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Request request, IOException e) {
            Log.d(TAG, "onFailure: " + e.getMessage());
            // show snackbar in Activity A
        }

        @Override
        public void onResponse(Response response) throws IOException {
            Log.d(TAG, "onResponse: " + response.body().string()); …