菜單圖標永遠不會顯示

Question

我想在我的操作欄中顯示一個圖標。它從未被顯示。 我的應用程序工作正常。即使操作欄按鈕的功能也適用。我錯過了什麼？

到目前爲止。我加了一個動作欄按鈕，如下：

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    tools:context=".MyActivity" > 
    <item android:id="@+id/Refresh" 
    android:title="@string/Refresh" 
    android:icon="@drawable/refresh_icon" 
    android:orderInCategory="100" 
    app:showAsAction ="always"/> 

    <item android:id="@+id/action_settings" 
    android:title="@string/action_settings" 
    android:orderInCategory="100" 
    app:showAsAction="never" /> 

</menu> 

我的主類：

import android.app.Activity; 
    import android.app.Fragment; 
    import android.app.FragmentManager; 
    import android.app.ProgressDialog; 
    import android.content.Intent; 
    import android.content.res.Configuration; 
    import android.content.res.TypedArray; 
    import android.os.AsyncTask; 
    import android.os.Bundle; 
    import android.support.v4.app.ActionBarDrawerToggle; 
    import android.support.v4.widget.DrawerLayout; 
    import android.util.Log; 
    import android.view.Menu; 
    import android.view.MenuItem; 
    import android.view.View; 
    import android.widget.AdapterView; 
    import android.widget.ListView; 
    import android.widget.Toast; 



    import java.util.ArrayList; 


    public class MyActivity extends Activity { 
private DrawerLayout mDrawerLayout; 
private ListView mDrawerList; 
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 ListView mListView; 
private ListViewNewsAdapter listViewNewsAdapter; 
private ArrayList<ListViewNewsItem> listViewNewsItems; 


private ArrayList<ListViewNewsItem> mData; 
private JSONParser jsonParser = new JSONParser(); 


private ArrayList<NavDrawerItem> navDrawerItems; 
private NavDrawerListAdapter adapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_my); 
    mListView = (ListView) findViewById(R.id.news_list_view); 

    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); 

    navDrawerItems = new ArrayList<NavDrawerItem>(); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1))); 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1))); 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1), true, "Estrenos")); 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1))); 

    // 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_drawer, 
      R.string.app_name, 
      R.string.app_name 
    ) { 
     public void onDrawerClosed(View view) { 
      getActionBar().setTitle(mTitle); 

      invalidateOptionsMenu(); 
     } 

     public void onDrawerOpened(View drawerView) { 
      getActionBar().setTitle(mDrawerTitle); 

      invalidateOptionsMenu(); 
     } 
    }; 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 

    if (savedInstanceState == null) { 

     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.my, 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; 
     case R.id.Refresh: 
      new GetNewsTask().execute(); 
      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(mDrawerList); 
    menu.findItem(R.id.action_settings).setVisible(!drawerOpen); 
    menu.findItem(R.id.Refresh).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 Seccion1(); 

      break; 
     case 1: 
      fragment = new Seccion2(); 
      break; 
     case 2: 
      fragment = new Seccion3(); 
      break; 
     case 3: 
      fragment = new Seccion4(); 
      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("Ramiro", "MainActivity - Error cuando se creo el 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); 
} 

}

Answer 1

我嘗試了很多代碼。 我想通了，我不得不做出這個代碼

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
     xmlns:tools="http://schemas.android.com/tools" 
     tools:context=".MyActivity" > 

這一個

<menu xmlns:android="http://schemas.android.com/apk/res/android" > 

即使它給我的menu.xml文件一個奇怪的錯誤，但它工作得很好