无法将LinearLayout强制转换为DrawerLayout

Question

我试图在导航抽屉顶部添加图像，但是每次运行它时，应用程序都会崩溃； logcat给我这个错误： java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.v4.widget.DrawerLayout$LayoutParams

这是我想要做的：

MainActivity.java

public class MainActivity extends Activity {

    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    @SuppressWarnings("deprecation")
    private ActionBarDrawerToggle mDrawerToggle;

    private Menu mymenu;

    // nav drawer title
    private CharSequence mDrawerTitle;

    // used to store app title
    private CharSequence mTitle;

    // slide menu items
    private String[] navMenuTitles;

    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);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

        navDrawerItems = new ArrayList<NavDrawerItem>();

        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0]));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1]));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2]));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3]));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4]));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5]));

        // 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_drawer, //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(1);
        }

        mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
    }

    /***
     * Called when invalidateOptionsMenu() is triggered
     */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // if nav drawer is opened, hide the action items
        //boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        //menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    @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();
    }

    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    /**
     * 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);
        }
    }

     /**
     * Diplaying fragment view for selected nav drawer list item
     * */
    private void displayView(int position) {
        // update the main content by replacing fragments
        Fragment fragment = null;
        Bundle args = new Bundle();
        switch (position) {
        case 0:
            break;
        case 1:
            fragment = new HomeFragment();
            break;
        case 2:
            fragment = new PoliticaFragment();
            break;
        case 3:
            fragment = new GiustiziaFragment();
            break;
        case 4:
            fragment = new MediaFragment();
            break;
        case 5:
            fragment = new EconomiaFragment();
            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");
        }*/

        fragment.setArguments(args);
        FragmentManager frgManager = getFragmentManager();
        FragmentTransaction ft = frgManager.beginTransaction();
        ft.replace(R.id.frame_container, fragment).commit();
        mDrawerList.setItemChecked(position, true);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

    @Override
    public void onBackPressed() {

        if(mDrawerLayout.isDrawerOpen(Gravity.LEFT)){
            mDrawerLayout.closeDrawer(Gravity.LEFT);
        }else{
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Add our menu
        getMenuInflater().inflate(R.menu.main, menu);

        // We should save our menu so we can use it to reset our updater.
        mymenu = menu;

        //
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Pass the event to ActionBarDrawerToggle, if it returns
        // true, then it has handled the app icon touch event
        if (mDrawerToggle.onOptionsItemSelected(item)) {
          return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }
}

activity_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 to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->

      <LinearLayout
       android:id="@+id/drawer"
       android:layout_width="240dp"
       android:layout_height="match_parent"
       android:orientation="vertical"
       android:layout_gravity="start" >

          <ImageView
              android:id="@+id/image_view"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:background="@drawable/logo_il_fatto_quotidiano" />

    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"       
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"/>

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

NavDrawerItem.java

public class NavDrawerItem {
    private String title;

    public NavDrawerItem(){}

    public NavDrawerItem(String title){
        this.title = title;
    }

    public String getTitle(){
        return this.title;
    }

    public void setTitle(String title){
        this.title = title;
    }
}

NavDrawerListAdapter.java

public class NavDrawerListAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<NavDrawerItem> navDrawerItems;

    public NavDrawerListAdapter(Context context, ArrayList<NavDrawerItem> navDrawerItems){
        this.context = context;
        this.navDrawerItems = navDrawerItems;
    }

    public int getCount() {
        return navDrawerItems.size();
    }

    public Object getItem(int position) {       
        return navDrawerItems.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater)
                    context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.drawer_list_item, null);
        }

        TextView txtTitle = (TextView) convertView.findViewById(R.id.title);

        txtTitle.setText(navDrawerItems.get(position).getTitle());

        return convertView;
    }
}

string.xml

    <!-- Nav Drawer Menu Items -->
    <string-array name="nav_drawer_items">
        <item>Item 1</item>
        <item>Item 2</item>
        <item>Item 3</item>
        <item>Item 4/item>
        <item>Item 5</item>
        <item>Item 6</item>
    </string-array>

你知道我在哪里做错了吗？ 谢谢！

Answer 1

在您的适配器中，而不是：

convertView = mInflater.inflate(R.layout.drawer_list_item, null);

尝试

convertView = mInflater.inflate(R.layout.drawer_list_item, parent, false);

否则，膨胀视图的布局参数将是行xml中定义的布局参数。 这可能与基本容器不匹配。 通过传递也将添加视图的ViewGroup，LayoutInflater可以创建正确的LayoutParams类型以匹配层次结构。 最后传入的错误是确保LayoutInflater仅创建视图，但不通过addView将其附加到父视图（这在适配器内部是必需的，因为AdapterView不实现addView（））