我试图做导航抽屉选项。
这是我的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>
如果我删除Linearlayout
则没有错误。此按钮显示在listview
后面,edittext
出现在屏幕中间。问题是对象没有对齐。有没有办法在DrawerLayout
中对齐视图对象?
如果我不删除linearlayout
,我会收到此错误:
LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams
堆栈跟踪:
E / AndroidRuntime(3454):FATAL EXCEPTION:main进程:com.brilliant.bridge,PID:3454 java.lang.ClassCastException: android.widget.LinearLayout $ LayoutParams无法强制转换为 android.support.v4.widget.DrawerLayout $ LayoutParams at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:910) 在 android.support.v4.widget.DrawerLayout.isDrawerOpen(DrawerLayout.java:1156) 在 com.brilliant.bridge.AdminMessages.onPrepareOptionsMenu(AdminMessages.java:220) 在android.app.Activity.onPreparePanel(Activity.java:2556)at 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.run(PhoneWindow.java:221) 在 android.view.Choreographer $ CallbackRecord.run(Choreographer.java:761) 在android.view.Choreographer.doCallbacks(Choreographer.java:574)at android.view.Choreographer.doFrame(Choreographer.java:543)at android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:747) 在android.os.Handler.handleCallback(Handler.java:733)处 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) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)at dalvik.system.NativeStart.main(原生方法)
public boolean onPrepareOptionsMenu(Menu menu) {
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
答案 0 :(得分:10)
在xml文件中为您的LinearLayout分配ID:
<LinearLayout
android:id="@+id/DrawerLinear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!-- YOUR LISTVIEW IS HERE -->
</LinearLayout>
然后在你的java类中,抛出这个LinearLayout:
private LinearLayout DrawerLinear;
在OnCreate中你应该这样做:
DrawerLinear = (LinearLayout) findViewById(R.id.DrawerLinear);
在你的onPrepareOptionMenu中,把它放在:
public boolean onPrepareOptionsMenu(Menu menu) {
boolean drawerOpen = mDrawerLayout.isDrawerOpen(DrawerLinear);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
它可以解决你的问题。