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中对齐视图对象?
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); }
解决方法
<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); }
它应该解决你的问题.