Java android抽屉的强制转换异常
阿维 我正在学习Android抽屉: 我遇到了一个奇怪的问题。应用程序启动时抛出:Java android抽屉的强制转换异常,java,android,classcastexception,Java,Android,Classcastexception,阿维 我正在学习Android抽屉: 我遇到了一个奇怪的问题。应用程序启动时抛出: 05-13 12:50:08.325 2030-2030/? E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.lanceit.haito.lanceit, PID: 2030 java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot
05-13 12:50:08.325 2030-2030/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.lanceit.haito.lanceit, PID: 2030
java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams
at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:1100)
at android.support.v4.widget.DrawerLayout.isDrawerOpen(DrawerLayout.java:1350)
at com.lanceit.haito.lanceit.activities.HubActivity.onPrepareOptionsMenu(HubActivity.java:183)
at android.app.Activity.onPreparePanel(Activity.java:2838)
at android.support.v4.app.FragmentActivity.onPrepareOptionsPanel(FragmentActivity.java:469)
at android.support.v7.app.ActionBarActivity.superOnPrepareOptionsPanel(ActionBarActivity.java:284)
at android.support.v7.app.ActionBarActivityDelegate.onPrepareOptionsPanel(ActionBarActivityDelegate.java:204)
at android.support.v7.app.ActionBarActivity.onPrepareOptionsPanel(ActionBarActivity.java:256)
at android.support.v4.app.FragmentActivity.onPreparePanel(FragmentActivity.java:458)
at android.support.v7.app.ActionBarActivity.superOnPreparePanel(ActionBarActivity.java:280)
at android.support.v7.app.ActionBarActivityDelegate$1.onPreparePanel(ActionBarActivityDelegate.java:84)
at android.support.v7.app.ActionBarActivityDelegateBase.preparePanel(ActionBarActivityDelegateBase.java:1006)
at android.support.v7.app.ActionBarActivityDelegateBase.doInvalidatePanelMenu(ActionBarActivityDelegateBase.java:1182)
at android.support.v7.app.ActionBarActivityDelegateBase.access$100(ActionBarActivityDelegateBase.java:79)
at android.support.v7.app.ActionBarActivityDelegateBase$1.run(ActionBarActivityDelegateBase.java:118)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
实际投掷部分:
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
thrown -->boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
代码:
和相关的XML文件:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg1"
tools:context="com.lanceit.haito.lanceit.activities.HubActivity">
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pager_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/primary_material_dark"
android:paddingBottom="10dp"
android:paddingTop="10dp" />
</android.support.v4.view.ViewPager>
<!-- The navigation drawer -->
<RelativeLayout
android:layout_width="280dp"
android:layout_height="match_parent"
android:id="@+id/drawerPane"
android:layout_gravity="start">
<!-- Profile Box -->
<RelativeLayout
android:id="@+id/profileBox"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="@color/material_blue_grey_800"
android:padding="8dp" >
<ImageView
android:id="@+id/avatar"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/ic_launcher"
android:layout_marginTop="15dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="42dp"
android:layout_centerVertical="true"
android:layout_marginLeft="15dp"
android:layout_toRightOf="@+id/avatar"
android:orientation="vertical" >
<TextView
android:id="@+id/userName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rishabh"
android:textColor="#fff"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="@+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_marginTop="4dp"
android:text="View Profile"
android:textColor="#fff"
android:textSize="12sp" />
</LinearLayout>
</RelativeLayout>
<!-- List of Actions (pages) -->
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/holo_red_light"
android:choiceMode="singleChoice"
android:divider="@android:color/black"
android:dividerHeight="5dp"/>
</RelativeLayout>
</android.support.v4.widget.DrawerLayout>
我认为您的mDrawerList应该直接位于抽屉布局中,这就是为什么它告诉您布局参数不能强制转换的原因。在您发布的示例中,您的xml应该如下所示,您使用的示例如下:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg1"
tools:context="com.lanceit.haito.lanceit.activities.HubActivity">
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pager_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/primary_material_dark"
android:paddingBottom="10dp"
android:paddingTop="10dp" />
</android.support.v4.view.ViewPager>
<CheckedTextView
android:id="@+id/home_drawer_cv_banks"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="@android:color/holo_red_light"
android:focusable="true"
android:text="Some Dummy Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#FFF" />
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/holo_red_light"
android:choiceMode="singleChoice"
android:divider="@android:color/black"
android:dividerHeight="5dp" >
</ListView>
再看看你举的例子
另一种方法是,在不更改xml的情况下,将LinearLayout传递给isDrawerOpen方法,其中是ListView,但它直接进入DrawerLayout,因此这是一个包含RelativeLayout的方法。看这个问题你能写下哪一行是活动。java:183。从错误中我了解到您的layoutParams的类型是错误的,但是我在code@GabriellaAngelova我更新了帖子并标记了有问题的部分。它位于onPrepareOptionsMenu->boolean-DrawerLayout=mDrawerLayout.isDrawerOpenmDrawerList中@anil我没有导入任何东西:>你的教程是2 yo。更喜欢这个:@hugogress我现在还不想用v21的东西。。。我的应用程序必须兼容v18+:Ok。。我应用了它,但我不能让它正常工作。。。我已经更新了我的XML,我正在尝试这样做:但是带有当前配置文件的部分根本没有显示。。Thx的帮助,这粉碎,但你能帮我也让这个抽屉完全工作吗?什么是不正确显示在当前的个人资料部分?
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg1"
tools:context="com.lanceit.haito.lanceit.activities.HubActivity">
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pager_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/primary_material_dark"
android:paddingBottom="10dp"
android:paddingTop="10dp" />
</android.support.v4.view.ViewPager>
<CheckedTextView
android:id="@+id/home_drawer_cv_banks"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="@android:color/holo_red_light"
android:focusable="true"
android:text="Some Dummy Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#FFF" />
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/holo_red_light"
android:choiceMode="singleChoice"
android:divider="@android:color/black"
android:dividerHeight="5dp" >
</ListView>