android.widget.FrameLayout不能轉換爲android.support.v4.widget.DrawerLayout

Question

我的應用程序工作正常，但是當我嘗試在我的主類左側添加一個側菜單時，我得到了第75行的錯誤，而且我不明白，請幫助我。

line 75: mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 

MainDrawer.java

package com.android.moyenne.activity; 

import android.content.Intent; 
import android.content.res.Configuration; 
import android.graphics.Shader.TileMode; 
import android.graphics.drawable.BitmapDrawable; 
import android.os.Build; 
import android.os.Bundle; 
import android.support.v4.app.ActionBarDrawerToggle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.Toast; 

import com.actionbarsherlock.app.SherlockFragmentActivity; 
import com.actionbarsherlock.view.Menu; 
import com.actionbarsherlock.view.MenuItem; 
import com.actionbarsherlock.view.MenuItem.OnMenuItemClickListener; 
import com.android.activity.R; 
import com.android.moyenne.ansco.ListAnSco; 

public class MainDrawer extends SherlockFragmentActivity { 

    // Declare Variables 
    DrawerLayout mDrawerLayout; 
    ListView mDrawerList; 
    ActionBarDrawerToggle mDrawerToggle; 
    MenuListAdapter mMenuAdapter; 
    String[] title; 
    String[] subtitle; 
    int[] icon; 
    Fragment aide = new Aide(); 
    Fragment about = new About(); 
    Fragment moyenne = new MoyenneMain(); 
    private CharSequence mDrawerTitle; 
    private CharSequence mTitle; 
    private static String aideTitle, aboutTitle,studentTitle; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     // Get the view from drawer_main.xml 
     setContentView(R.layout.drawer_main); 

     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 
       BitmapDrawable bg = (BitmapDrawable)getResources().getDrawable(R.drawable.bg_striped); 
       bg.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT); 
       getSupportActionBar().setBackgroundDrawable(bg); 

       BitmapDrawable bgSplit = (BitmapDrawable)getResources().getDrawable(R.drawable.bg_striped_split_img); 
       bgSplit.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT); 
       getSupportActionBar().setSplitBackgroundDrawable(bgSplit); 
      } 

     // Get the Title 
     mTitle = mDrawerTitle = getTitle(); 

     // Generate title 
     aideTitle = getResources().getString(R.string.aide); 
     aboutTitle = getResources().getString(R.string.about); 
     studentTitle = getResources().getString(R.string.app_title); 
     title = new String[] { studentTitle, aideTitle, aboutTitle }; 

     // Generate subtitle 
     subtitle = new String[] { "Menu principal", "Aide sur l'application", 
       "A propos de l'application" }; 

     // Generate icon 
     icon = new int[] { R.drawable.home, android.R.drawable.ic_menu_help, android.R.drawable.ic_menu_info_details}; 
     // Locate DrawerLayout in drawer_main.xml 
     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 

     // Locate ListView in drawer_main.xml 
     mDrawerList = (ListView) findViewById(R.id.listview_drawer); 

     // Set a custom shadow that overlays the main content when the drawer 
     // opens 
     mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, 
       GravityCompat.START); 

     // Pass string arrays to MenuListAdapter 
     mMenuAdapter = new MenuListAdapter(MainDrawer.this, title, subtitle, 
       icon); 

     // Set the MenuListAdapter to the ListView 
     mDrawerList.setAdapter(mMenuAdapter); 

     // Capture listview menu item click 
     mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 

     // Enable ActionBar app icon to behave as action to toggle nav drawer 
     getSupportActionBar().setHomeButtonEnabled(true); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

     // ActionBarDrawerToggle ties together the the proper interactions 
     // between the sliding drawer and the action bar app icon 
     mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, 
       R.drawable.ic_drawer, R.string.drawer_open, 
       R.string.drawer_close) { 

      @Override 
      public void onDrawerClosed(View view) { 
       // TODO Auto-generated method stub 
       super.onDrawerClosed(view); 
      } 

      @Override 
      public void onDrawerOpened(View drawerView) { 
       // TODO Auto-generated method stub 
       // Set the title on the action when drawer open 
       getSupportActionBar().setTitle(mDrawerTitle); 
       super.onDrawerOpened(drawerView); 
      } 
     }; 

     mDrawerLayout.setDrawerListener(mDrawerToggle); 

     if (savedInstanceState == null) { 
      selectItem(0); 
     } 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     if (item.getItemId() == android.R.id.home) { 

      if (mDrawerLayout.isDrawerOpen(mDrawerList)) { 
       mDrawerLayout.closeDrawer(mDrawerList); 
      } else { 
       mDrawerLayout.openDrawer(mDrawerList); 
      } 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    // ListView click listener in the navigation drawer 
    private class DrawerItemClickListener implements 
      ListView.OnItemClickListener { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, 
       long id) { 
      selectItem(position); 
     } 
    } 

    private void selectItem(int position) { 

     FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
     // Locate Position 
     switch (position) { 
     case 0: 
      ft.replace(R.id.content_frame, moyenne); 
      break; 
     case 1: 
      ft.replace(R.id.content_frame, aide); 
      break; 
     case 2: 
      ft.replace(R.id.content_frame, about); 
      break; 
     } 
     ft.commit(); 
     mDrawerList.setItemChecked(position, true); 

     // Get the title followed by the position 
     setTitle(title[position]); 
     // Close drawer 
     mDrawerLayout.closeDrawer(mDrawerList); 
     title = new String[] { studentTitle, aideTitle, aboutTitle}; 

     // Generate subtitle 
     subtitle = new String[] { "Menu principal", "Aide sur l'application", 
       "A propos de l'application", "Permet de prendre des notes" }; 
    } 

    @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 toggles 
     mDrawerToggle.onConfigurationChanged(newConfig); 
    } 

    @Override 
    public void setTitle(CharSequence title) { 
     mTitle = title; 
     getSupportActionBar().setTitle(mTitle); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Get the options menu view from menu.xml in menu folder 
     getSupportMenuInflater().inflate(R.menu.menu, menu); 
     // Show the settings menu item in menu.xml 
     MenuItem menuSettings = menu.findItem(R.id.menu_settings); 

     // Capture menu item clicks 
     menuSettings.setOnMenuItemClickListener(new OnMenuItemClickListener() { 

      @Override 
      public boolean onMenuItemClick(MenuItem item) { 
       // TODO Auto-generated method stub 
       // Do something here 
       Intent intent = new Intent(getApplicationContext(), 
         ListAnSco.class); 
       startActivity(intent); 
       finish(); 
       return false; 
      } 

     }); 

     return true; 
     } 

     // Capture first menu button click 
     OnMenuItemClickListener setButtonClickListener = new OnMenuItemClickListener() { 

      @Override 
      public boolean onMenuItemClick(MenuItem item) { 
       // Create a simple toast message 
       Toast.makeText(MainDrawer.this, "Set Button", Toast.LENGTH_SHORT) 
         .show(); 
       // Do something else 
       return false; 
      } 
     }; 

} 

drawer_main.xml

<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 
     android:id="@+id/content_frame" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <ListView 
     android:id="@+id/listview_drawer" 
     android:layout_width="240dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:background="@drawable/bg_striped" 
     android:choiceMode="singleChoice" 
     android:dividerHeight="2dip" 
     android:divider="@drawable/list_divider_bl" /> 

</android.support.v4.widget.DrawerLayout> 

登錄：

10-29 00:28:31.773: E/AndroidRuntime(1241): FATAL EXCEPTION: main 
10-29 00:28:31.773: E/AndroidRuntime(1241): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.activity/com.android.moyenne.activity.MainDrawer}: java.lang.ClassCastException: android.widget.FrameLayout cannot be cast to android.support.v4.widget.DrawerLayout 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.os.Looper.loop(Looper.java:137) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at java.lang.reflect.Method.invoke(Method.java:525) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at dalvik.system.NativeStart.main(Native Method) 
10-29 00:28:31.773: E/AndroidRuntime(1241): Caused by: java.lang.ClassCastException: android.widget.FrameLayout cannot be cast to android.support.v4.widget.DrawerLayout 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at com.android.moyenne.activity.MainDrawer.onCreate(MainDrawer.java:75) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.Activity.performCreate(Activity.java:5133) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
10-29 00:28:31.773: E/AndroidRuntime(1241):  ... 11 more 

Answer 1

我不能找到任何問題，在你的代碼。只需嘗試Project--> Clean並在uninstalling Previous Build可能會解決您的問題後再次運行它。

Answer 2

嘗試捕捉異常。

public boolean onPrepareOptionsMenu(Menu menu) { 
    try { 
     DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_Layout); 

     boolean drawerOpen = mDrawerLayout.isDrawerOpen(GravityCompat.START); 
     menu.findItem(R.id.action_settings).setVisible(!drawerOpen); 
    } 
    catch (Exception e) { 

    } 
    return super.onPrepareOptionsMenu(menu); 
}