每当我想使用导航抽屉使用滑动菜单时，请给我Error ClassCast Exception。
我不知道我的错误是什么？ 实际上解决问题试图找出谷歌和改变代码相关它。但我无法解决错误。请参阅我的代码并指导我代码中的错误内容和位置。 请建议我。 在此先感谢。
我附上代码。
Java文件
public class MainActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private LinearLayout llDrawerLauyout;
private ListView slidermenu = null;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
slidermenu = (ListView) findViewById(R.id.slidermenu);
llDrawerLauyout=(LinearLayout)findViewById(R.id.llDrawerLauyout);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons
.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons
.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons
.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons
.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons
.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons
.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_launcher, // nav menu toggle icon
R.string.app_name, // nav drawer open - description for
// accessibility
R.string.app_name // nav drawer close - description for
// accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(llDrawerLauyout);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
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" >
<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/llDrawerLauyout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="100" >
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="0dp"
android:layout_height="500dp"
android:layout_gravity="start"
android:layout_weight="50"
android:background="#6A57A9"
android:choiceMode="singleChoice"
android:divider="#4D1212"
android:dividerHeight="1dp" />
<ListView
android:id="@+id/slidermenu"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="50"
android:background="#FF00FF"
android:choiceMode="singleChoice"
android:divider="#FF0000"
android:dividerHeight="1dp" />
</LinearLayout>
</FrameLayout>
</android.support.v4.widget.DrawerLayout>
错误LogCat
05-04 15:38:03.694: E/AndroidRuntime(19205): FATAL EXCEPTION: main
05-04 15:38:03.694: E/AndroidRuntime(19205): Process: com.example.slidingmenu, PID: 19205
05-04 15:38:03.694: E/AndroidRuntime(19205): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.slidingmenu/com.example.slidingmenu.MainActivity}: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2359)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2411)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread.access$800(ActivityThread.java:151)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.os.Handler.dispatchMessage(Handler.java:110)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.os.Looper.loop(Looper.java:193)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread.main(ActivityThread.java:5323)
05-04 15:38:03.694: E/AndroidRuntime(19205): at java.lang.reflect.Method.invokeNative(Native Method)
05-04 15:38:03.694: E/AndroidRuntime(19205): at java.lang.reflect.Method.invoke(Method.java:515)
05-04 15:38:03.694: E/AndroidRuntime(19205): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
05-04 15:38:03.694: E/AndroidRuntime(19205): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
05-04 15:38:03.694: E/AndroidRuntime(19205): at dalvik.system.NativeStart.main(Native Method)
05-04 15:38:03.694: E/AndroidRuntime(19205): Caused by: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:1100)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.support.v4.widget.DrawerLayout.closeDrawer(DrawerLayout.java:1305)
05-04 15:38:03.694: E/AndroidRuntime(19205): at com.example.slidingmenu.MainActivity.displayView(MainActivity.java:188)
05-04 15:38:03.694: E/AndroidRuntime(19205): at com.example.slidingmenu.MainActivity.onCreate(MainActivity.java:115)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.Activity.performCreate(Activity.java:5343)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
05-04 15:38:03.694: E/AndroidRuntime(19205): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2323)
05-04 15:38:03.694: E/AndroidRuntime(19205): ... 11 more
答案 0 :(得分：0)
检查项目的libs文件夹中是否有“android-support-v4.jar”文件，如果它没有从sdk路径“sdk \ extras \ android \ support \ v4”复制.jar文件，那么清理项目和运行
答案 1 :(得分：0)
使用这些代码行......
android.support.v4.widget.DrawerLayout mDrawerLayout = (android.support.v4.widget.DrawerLayout) findViewById(R.id.drawer_layout);