RelativeLayout无法强制转换为android.support.v7.widget.Toolbar [英] RelativeLayout cannot be cast to android.support.v7.widget.Toolbar
本文介绍了RelativeLayout无法强制转换为android.support.v7.widget.Toolbar的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在ToolBar中添加阴影,并使用以下链接:
ToolBar Shadow
I want to add shadow to ToolBar and I use the following link: ToolBar Shadow
但正在运行的应用程序在LogCat中显示此错误:
but running app show me this error in LogCat :
java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.support.v7.widget.Toolbar
工具栏代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="200dp">
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="200dp"
app:popupTheme="@style/ThemeOverlay.AppCompat.Dark"
app:theme="@style/MyCustomToolbarTheme"
android:background="@drawable/main_header">
</android.support.v7.widget.Toolbar>
MainActivity XML:
MainActivity XML :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar_main"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/app_bar"
android:text="ytkbhjk"/>
MainActivity Java:
MainActivity Java :
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
请帮帮我
推荐答案
您将需要再创建一个包含工具栏的xml文件:
此xml的名称是工具栏
You are going to need to make one more xml file which contains your toolbar: Name of this xml is toolbar
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"/>
现在更改您的相对布局的 include 标签
Now change your relative layout's include tag like this
<include
layout="@layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
在您的活动中,请执行以下操作:
And in your activity, do something like this:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
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