我正在尝试做抽屉导航选项。
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。此按钮出现在 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 View 对象?
如果我不删除 linearlayout
我会得到这个错误:
LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams
堆栈跟踪:
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);
}
最佳答案
在 xml 文件中为您的 LinearLayout 分配一个 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,转换这个 LinearLayout:
private LinearLayout DrawerLinear;
在 OnCreate 中你应该这样做:
DrawerLinear = (LinearLayout) findViewById(R.id.DrawerLinear);
在你的 onPrepareOptionMenu 中,把这个:
public boolean onPrepareOptionsMenu(Menu menu) {
boolean drawerOpen = mDrawerLayout.isDrawerOpen(DrawerLinear);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
它应该可以解决您的问题。
关于android - LinearLayout$LayoutParams 无法转换为 android.support.v4.widget.DrawerLayout$LayoutParams,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23955603/