的LinearLayout $的LayoutParams不能转换为android.support.v4.widget.DrawerLayout $的LayoutParams [英] LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams

问题描述

我想要做的抽屉式导航选项。

下面是我的xml：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; android.support.v4.widget.DrawerLayout
    的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：ID =@ + ID / drawer_layout
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent＆GT;
    ＆LT;的LinearLayout
        机器人：layout_width =match_parent
        机器人：layout_height =WRAP_CONTENT
        机器人：方向=垂直＆GT;
        ＆LT;按钮
             机器人：ID =@ + ID / sendnewmessages
             机器人：layout_width =WRAP_CONTENT
             机器人：layout_height =30dp
             机器人：背景=@可绘制/ nothere
             机器人：重力=center_horizo​​ntal
             机器人：则shadowColor =@机器人：彩色/黑白
             机器人：shadowDx =1
             机器人：shadowDy =1
             机器人：shadowRadius =1
             机器人：文=发送新邮件
             机器人：textAlignment =中心
             机器人：文字颜色=@机器人：彩色/黑白/＆GT;
        ＆LT;的EditText
             机器人：ID =@ + ID / searchmessage
             机器人：layout_height =40dp
             机器人：layout_width =200dp
             机器人：重力=中心
             机器人：提示=搜索信息/＆GT;
        ＆LT;的ListView
            机器人：ID =@ + ID /列表视图
            机器人：layout_width =match_parent
            机器人：layout_height =WRAP_CONTENT＆GT;
        ＆LT; / ListView控件＆GT;
        ＆LT; ListView的机器人：ID =@ + ID / left_drawer
            机器人：layout_width =240dp
            机器人：layout_height =match_parent
            机器人：layout_gravity =开始
            机器人：choiceMode =singleChoice
            机器人：分隔=@机器人：彩色/透明
            机器人：dividerHeight =0dp
            机器人：后台=＃111/＆GT;
    ＆LT; / LinearLayout中＆GT;
＆LT; /android.support.v4.widget.DrawerLayout>
 

如果我删除的LinearLayout 没有错误。此按钮出现的背后列表视图，的EditText 出现在屏幕中央。的问题是，对象未对准。有没有办法在 DrawerLayout 对齐视图对象？

如果我不删除的LinearLayout 我得到这个错误：

 的LinearLayout $的LayoutParams不能转换为android.support.v4.widget.DrawerLayout $的LayoutParams
 

堆栈跟踪：

  

    

E / AndroidRuntime（3454）：致命异常：主要流程：com.brilliant.bridge，PID：3454 java.lang.ClassCastException：     android.widget.LinearLayout $的LayoutParams不能转换到     android.support.v4.widget.DrawerLayout $的LayoutParams在     android.support.v4.widget.DrawerLayout.isDrawerView（DrawerLayout.java:910）     在     android.support.v4.widget.DrawerLayout.isDrawerOpen（DrawerLayout.java:1156）     在     com.brilliant.bridge.AdminMessages.on prepareOptionsMenu（AdminMessages.java:220）     在android.app.Activity.on $ P $在pparePanel（Activity.java:2556）     com.android.internal.policy.impl.PhoneWindow。preparePanel（PhoneWindow.java:464）     在     com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu（PhoneWindow.java:800）     在     com.android.internal.policy.impl.PhoneWindow $ 1.运行（PhoneWindow.java:221）     在     android.view.Choreographer $ CallbackRecord.run（Choreographer.java:761）     在android.view.Choreographer.doCallbacks（Choreographer.java:574）在     android.view.Choreographer.doFrame（Choreographer.java:543）在     android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:747）     在android.os.Handler.handleCallback（Handler.java:733）在     android.os.Handler.dispatchMessage（Handler.java:95）在     android.os.Looper.loop（Looper.java:136）在     android.app.ActivityThread.main（ActivityThread.java:5017）在     java.lang.reflect.Method.invokeNative（本机方法）在     java.lang.reflect.Method.invoke（Method.java:515）在     com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:779）     在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）在     dalvik.system.NativeStart.main（本机方法）

  

  prepareOptionsMenu（功能菜单）公共布尔{

    布尔drawerOpen = mDrawerLayout.isDrawerOpen（mDrawerList）;
    menu.findItem（R.id.action_websearch）.setVisible（drawerOpen！）;
    返回super.on prepareOptionsMenu（菜单）;
}
 

解决方案

分配一个ID在XML文件中的LinearLayout中：

 ＆LT;的LinearLayout
        机器人：ID =@ + ID / DrawerLinear
        机器人：layout_width =match_parent
        机器人：layout_height =WRAP_CONTENT
        机器人：方向=垂直＆GT;

        ＆LT;！ - 你LISTVIEW IS HERE  - ＆GT;
＆LT; / LinearLayout中＆GT;
 

然后，在你的java类，施放此的LinearLayout：

 私人的LinearLayout DrawerLinear;
 

在OnCreate中，你应该这样做：

  DrawerLinear =（的LinearLayout）findViewbyid（R.id.DrawerLinear）;
 

而在你的prepareOptionMenu，把这样的：

  prepareOptionsMenu（功能菜单）公共布尔{

    布尔drawerOpen = mDrawerLayout.isDrawerOpen（DrawerLinear）;
    menu.findItem（R.id.action_websearch）.setVisible（drawerOpen！）;
    返回super.on prepareOptionsMenu（菜单）;
}
 

它应该解决您的问题。

I'm trying to do Navigation drawer options.

Here is my xml:

<?xml version="1.0" encoding="utf-8"?>
<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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <Button
             android:id="@+id/sendnewmessages"
             android:layout_width="wrap_content"
             android:layout_height="30dp"
             android:background="@drawable/nothere"
             android:gravity="center_horizontal"
             android:shadowColor="@android:color/black"
             android:shadowDx="1"
             android:shadowDy="1"
             android:shadowRadius="1"
             android:text="Send New Messages"
             android:textAlignment="center"
             android:textColor="@android:color/black" />
        <EditText
             android:id="@+id/searchmessage"
             android:layout_height="40dp"
             android:layout_width="200dp"
             android:gravity="center"
             android:hint="Search Messages"/>
        <ListView
            android:id="@+id/listview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </ListView>
        <ListView android:id="@+id/left_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:choiceMode="singleChoice"
            android:divider="@android:color/transparent"
            android:dividerHeight="0dp"
            android:background="#111"/>
    </LinearLayout>
</android.support.v4.widget.DrawerLayout>

If I remove Linearlayout there is no error. This button appears behind listview, edittext appears in the middle of screen. The problem is that the objects are not aligned. Is there a way align view objects in DrawerLayout?

If I don't remove linearlayout I get this error:

LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams

stacktrace:

E/AndroidRuntime(3454): FATAL EXCEPTION: main Process: com.brilliant.bridge, PID: 3454 java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:910) at android.support.v4.widget.DrawerLayout.isDrawerOpen(DrawerLayout.java:1156) at com.brilliant.bridge.AdminMessages.onPrepareOptionsMenu(AdminMessages.java:220) at android.app.Activity.onPreparePanel(Activity.java:2556) at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:464) at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:800) at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:221) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) at android.view.Choreographer.doCallbacks(Choreographer.java:574) at android.view.Choreographer.doFrame(Choreographer.java:543) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5017) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) at dalvik.system.NativeStart.main(Native Method)

public boolean onPrepareOptionsMenu(Menu menu) {

    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
    menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}

解决方案

Assign an ID to your LinearLayout in xml file:

<LinearLayout
        android:id="@+id/DrawerLinear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <!-- YOUR LISTVIEW IS HERE -->
</LinearLayout>

Then in you java class, Cast this LinearLayout:

private LinearLayout    DrawerLinear;

In OnCreate you should do this:

DrawerLinear = (LinearLayout) findViewbyid(R.id.DrawerLinear);

And in your onPrepareOptionMenu, put this:

public boolean onPrepareOptionsMenu(Menu menu) {

    boolean drawerOpen = mDrawerLayout.isDrawerOpen(DrawerLinear);
    menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}

it should solve your problem.

这篇关于的LinearLayout $的LayoutParams不能转换为android.support.v4.widget.DrawerLayout $的LayoutParams的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！