InflateException auf inflater.inflate() Methodenaufruf

Question

Ich bekomme immer eine InflateException beim Versuch, eine Ansicht in meiner MenuAdapter Klasse aufzublasen. Ich habe den lästigen Code in einem Try-Catch-Block umgeben und die Fehlermeldung:

Link auf das gesamte Projekt:

https://docs.google.com/file/d/0B2Iwl4UysxOMa3E5a1l2SHZwOG8/edit?usp=sharing

Binary XML-Datei Zeile # 1: Fehler aufblähenden Klasse

Hier ist der Code:

package com.example.sidemenututorial; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class MenuListAdapter extends BaseAdapter { 

    // Fields ----------------------------------------------------------------- 
    private Context context; 
    private String[] titles; 
    private String[] subtitles; 
    private int[] icons; 
    private LayoutInflater inflater; 

    // Constructor ------------------------------------------------------------ 
    public MenuListAdapter(
      Context context, 
      String[] titles, 
      String[] subtitles, 
      int[] icons){ 
     this.context = context; 
     this.titles = titles; 
     this.subtitles = subtitles; 
     this.icons = icons; 
     inflater = (LayoutInflater)context.getSystemService(
       Context.LAYOUT_INFLATER_SERVICE); 
    } 

    // Accessors -------------------------------------------------------------- 
    @Override 
    public int getCount(){ 
     return titles.length; 
    } 
    @Override 
    public Object getItem(int position){ 
     return titles[position]; 
    } 
    @Override 
    public long getItemId(int position){ 
     return position; 
    } 

    // Methods ---------------------------------------------------------------- 
    public View getView(int position, View convertView, ViewGroup parent){ 

     ViewHolder viewHolder; 

     // Only inflate the view if convertView is null 
     if (convertView == null){ 
      viewHolder = new ViewHolder(); 
      convertView = inflater.inflate(
        R.layout.drawer_list_item, parent, false); 
      viewHolder.txtTitle = (TextView)convertView.findViewById(
        R.id.title); 
      viewHolder.txtSubtitle = (TextView)convertView.findViewById(
        R.id.subtitle); 
      viewHolder.imgIcon = (ImageView)convertView.findViewById(
        R.id.icon); 

      // This is the first time this view has been inflated, 
      // so store the view holder in its tag fields 
      convertView.setTag(viewHolder); 
     } else { 
      viewHolder = (ViewHolder)convertView.getTag(); 
     } 

     // Set the views fields as needed 
     viewHolder.txtTitle.setText(titles[position]); 
     viewHolder.txtSubtitle.setText(subtitles[position]); 
     viewHolder.imgIcon.setImageResource(icons[position]); 

     return convertView; 
    } 

    // Classes ---------------------------------------------------------------- 
    static class ViewHolder { 
     TextView txtTitle; 
     TextView txtSubtitle; 
     ImageView imgIcon; 
    } 

} 

And here is the view it is trying to inflate, the drawer_list_item.xml: 

     <LinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:background="?android:color/darker_gray" 
      android:orientation="horizontal" 
      style="?attr/dropdownListPreferredItemHeight" > 

     <ImageView 
      android:id="@+id/icon" 
      android:layout_width="wrap_content" 
      android:layout_height="match_parent" 
      android:adjustViewBounds="true"/> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="match_parent" 
      android:gravity="center_vertical|left" 
      android:orientation="vertical"> 

      <TextView 
       android:id="@+id/title" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:ellipsize="end" 
       android:singleLine="true" 
       style="?attr/spinnerDropDownItemStyle"/> 
      <TextView 
       android:id="@+id/subtitle" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:ellipsize="end" 
       android:singleLine="true" 
       android:textAppearance="?attr/textAppearanceSmall" 
       style="?attr/spinnerDropDownItemStyle"/> 

     </LinearLayout>  

    </LinearLayout> 

Und hier ist der Client-Code, der das Menü Adapter ruft:

 package com.example.sidemenututorial; 

    import android.content.res.Configuration; 
    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 com.actionbarsherlock.app.SherlockFragmentActivity; 
    import com.actionbarsherlock.view.MenuItem; 

    public class MainActivity extends SherlockFragmentActivity { 

     // Fields ----------------------------------------------------------------- 
     private DrawerLayout drawerLayout; 
     private ListView drawerList; 
     private ActionBarDrawerToggle drawerToggle; 
     private MenuListAdapter menuAdapter; 
     private int[] icons; 
     private Fragment fragment1; 
     private Fragment fragment2; 
     private Fragment fragment3; 
     private CharSequence drawerTitle; 
     private CharSequence title; 
     private final String[] titles = new String[]{ 
       "Title Fragment #1", 
       "Title Fragment #2", 
       "Title Fragment #3" 
     }; 
     private final String[] subtitles = new String[]{ 
       "Subtitle Fragment #1", 
       "Subtitle Fragment #2", 
       "Subtitle Fragment #3" 
     }; 

     // Lifecycle Callbacks ---------------------------------------------------- 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 

      // Base implemenation 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      // Instantiate the fragments 
      fragment1 = new Fragment1(); 
      fragment2 = new Fragment2(); 
      fragment3 = new Fragment3(); 

      // Get the title from this activity 
      title = drawerTitle = getTitle(); 

      // Get the icons from the drawables folder 
      icons = new int[]{ 
        R.drawable.action_about, 
        R.drawable.action_settings, 
        R.drawable.collections_cloud 
      }; 

      // Get the drawer layout from the XML file and the ListView inside it 
      drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout); 
      drawerList = (ListView)findViewById(R.id.listview_drawer); 

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

      // Pass the string arrays to the MenuListAdapter, set the drawer 
      // list adapter to it and set up its click listener 
      menuAdapter = new MenuListAdapter(
        MainActivity.this, titles, subtitles, icons); 
      drawerList.setAdapter(menuAdapter); 
      drawerList.setOnItemClickListener(new DrawerItemClickListener()); 

      // Enable the action bar to have up navigation 
      getSupportActionBar().setHomeButtonEnabled(true); 
      getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

      // Allow the the action bar to toggle the drawer 
      drawerToggle = new ActionBarDrawerToggle(
        this, 
        drawerLayout, 
        R.drawable.ic_drawer, 
        R.string.drawer_open, 
        R.string.drawer_close){ 

       public void onDrawerClosed(View view){ 
        super.onDrawerClosed(view); 
       } 
       public void onDrawerOpened(View view){ 
        getSupportActionBar().setTitle(drawerTitle); 
        super.onDrawerOpened(view); 
       } 
      }; 
      drawerLayout.setDrawerListener(drawerToggle); 

      // If this is the first time opening this activity, 
      // start with loading fragment #1 
      if (savedInstanceState == null){ 
       selectItem(0); 
      }  

     } 

     // Methods ---------------------------------------------------------------- 
     @Override 
     public boolean onOptionsItemSelected(MenuItem item){ 

      // If the user has pressed the action bar icon 
      if (item.getItemId() == android.R.id.home){ 

       // If the drawer is open, close it; vice versa 
       if (drawerLayout.isDrawerOpen(drawerList)){ 
        drawerLayout.closeDrawer(drawerList); 
       } else { 
        drawerLayout.openDrawer(drawerList); 
       } 
      } 

      // Finish by letting the super class do the rest 
      return super.onOptionsItemSelected(item); 

     } 
     @Override 
     protected void onPostCreate(Bundle savedInstanceState){ 

      // Call the super implementation and synchronize the drawer 
      super.onPostCreate(savedInstanceState); 
      drawerToggle.syncState(); 

     } 
     @Override 
     public void onConfigurationChanged(Configuration newConfig){ 

      // Call the super implemenation on this activity 
      // and the drawer toggle object 
      super.onConfigurationChanged(newConfig); 
      drawerToggle.onConfigurationChanged(newConfig); 

     } 
     private void selectItem(int position){ 

      // Create a new fragment transaction and start it 
      FragmentTransaction fragTran = getSupportFragmentManager() 
              .beginTransaction(); 

      // Locate the position selected replace the content view 
      // with the fragment of the number selected 
      switch (position){ 
       case 0:{ 
        fragTran.replace(R.id.content_frame, fragment1); 
        break; 
       } 
       case 1:{ 
        fragTran.replace(R.id.content_frame, fragment2); 
        break; 
       } 
       case 2:{ 
        fragTran.replace(R.id.content_frame, fragment3); 
        break; 
       } 
      } 

      // Commit the transaction and close the drawer 
      fragTran.commit(); 
      drawerList.setItemChecked(position, true); 
      drawerLayout.closeDrawer(drawerList); 

     } 
     public void setTitle(CharSequence title){ 

      // Save the passed in title and set the action bar title 
      this.title = title; 
      getSupportActionBar().setTitle(title); 

     } 

     // Classes ---------------------------------------------------------------- 
     private class DrawerItemClickListener 
     implements ListView.OnItemClickListener{ 

      @Override 
      public void onItemClick(
        AdapterView<?> parent, 
        View view, 
        int position, 
        long id) { 

       // When clicked, select open the appropriate fragment 
       selectItem(position); 

      } 

     } 

    } 

Und ein Protokoll des Absturzes:

09-26 16:45:43.081: D/AndroidRuntime(1121): Shutting down VM 
09-26 16:45:43.081: W/dalvikvm(1121): threadid=1: thread exiting with uncaught exception (group=0x409961f8) 
09-26 16:45:45.561: E/AndroidRuntime(1121): FATAL EXCEPTION: main 
09-26 16:45:45.561: E/AndroidRuntime(1121): java.lang.NullPointerException 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at com.example.sidemenututorial.MenuListAdapter.getView(MenuListAdapter.java:73) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.AbsListView.obtainView(AbsListView.java:2033) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.ListView.makeAndAddView(ListView.java:1772) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.ListView.fillDown(ListView.java:672) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.ListView.fillFromTop(ListView.java:732) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.ListView.layoutChildren(ListView.java:1625) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.AbsListView.onLayout(AbsListView.java:1863) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.View.layout(View.java:11180) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewGroup.layout(ViewGroup.java:4203) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:672) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.View.layout(View.java:11180) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewGroup.layout(ViewGroup.java:4203) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.View.layout(View.java:11180) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewGroup.layout(ViewGroup.java:4203) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.View.layout(View.java:11180) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewGroup.layout(ViewGroup.java:4203) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.View.layout(View.java:11180) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewGroup.layout(ViewGroup.java:4203) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1468) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.os.Handler.dispatchMessage(Handler.java:99) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.os.Looper.loop(Looper.java:137) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at android.app.ActivityThread.main(ActivityThread.java:4340) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
09-26 16:45:45.561: E/AndroidRuntime(1121):  at dalvik.system.NativeStart.main(Native Method) 
09-26 16:45:45.593: D/dalvikvm(1121): GC_CONCURRENT freed 191K, 3% free 14296K/14599K, paused 12ms+8ms 

Answer 1

Verwenden einer ViewHolder

http://developer.android.com/training/improving-layouts/smooth-scrolling.html

ändern getView zu

public View getView(int position, View convertView, ViewGroup parent){ 

    ViewHolder vh; 
    if(convertView==null) 
    { 
     vh = new ViewHolder(); 
     convertView = inflater.inflate(
       R.layout.drawer_list_item, parent, false); 
     vh.txtTitle = (TextView) convertView.findViewById(R.id.title); 
     vh.txtSubtitle = (TextView) convertView.findViewById(R.id.subtitle); 
     vh.imgIcon = (ImageView) convertView.findViewById(R.id.icon); 

     convertView.setTag(vh); 
    } else { 
    vh = (ViewHolder) convertView.getTag(); 
    } 
    vh.txtTitle.setText(titles[position]); 
    vh.txtSubtitle.setText(subtitles[position]); 
    vh.imgIcon.setImageResource(icons[position]); 

    return convertView; 
    } 
static class ViewHolder 
{ 
TextView txtTitle,txtSubtitle; 
ImageView imgIcon; 
} 

Auch die unten an Konstruktor bewegen. Deklarieren Sie diese als Klassenmitglied LayoutInflater inflater

In Ihrem Konstruktor

inflater = (LayoutInflater)context.getSystemService(
       Context.LAYOUT_INFLATER_SERVICE); 

Edit:

In drawer_list_item.xml

ändern

android:background="?android:color/darker_gray" 

zu

android:background="@android:color/darker_gray" 

Answer 2

Wenn Sie Fehler beim Aufblasen Ihrer Klasse bekommen, müssen Sie zuerst in Ihrem XML nach dem Problem suchen.

In Ihrem Fall ist das Problem in Ihrem drawer_list_item Layout. In Ihrem linearLayout-Wurzel das "?" Zeichen verursacht es mit android: background = "? Android: color/darker_gray" Zeile.