Question

我正在阅读谷歌的教程，无法弄清楚如何在行动栏上放置搜索图标。

这是main_activity_actions.xml代码： -

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
   <!-- Search, should appear as action button -->
   <item android:id="@+id/action_search"
         android:orderInCategory="100"
         android:icon="@drawable/ic_action_search"
         android:title="@string/action_search"
         android:showAsAction="always" />


   <!-- Settings, should always be in the overflow -->
   <item android:id="@+id/action_settings"
         android:title="@string/action_settings"
         android:showAsAction="never" />
</menu>

这是MainActivity.java： -

public class MainActivity extends ActionBarActivity
{
   public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";

   @Override
   protected void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_display_message);

      getSupportActionBar().setDisplayHomeAsUpEnabled(true);

      if (savedInstanceState == null)
      {
         getSupportFragmentManager().beginTransaction()
               .add(R.id.container, new PlaceholderFragment()).commit();
      }
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu)
   {
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.main_activity_actions, menu);
      return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle presses on the action bar items
       switch (item.getItemId()) {
           case R.id.action_search:
               openSearch();
               return true;
           case R.id.action_settings:
               openSettings();
               return true;
           default:
               return super.onOptionsItemSelected(item);
       }
   }

   /**
    * A placeholder fragment containing a simple view.
    */
   public static class PlaceholderFragment extends Fragment
   {

      public PlaceholderFragment()
      {
      }

       @Override
       public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState)
       {
              View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
              return rootView;
       }
    }

   public void sendMessage(View view) {
      Intent intent = new Intent(this, DisplayMessageActivity.class);
      EditText editText = (EditText) findViewById(R.id.edit_message);
      String message = editText.getText().toString();
      intent.putExtra(EXTRA_MESSAGE, message);
      startActivity(intent);
   }

   public void openSearch()
   {

   }

   public void openSettings()
   {

   }

}

Manifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myfirstapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:theme="@style/Theme.AppCompat.Light"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="com.example.myfirstapp.MainActivity" 
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.myfirstapp.DisplayMessageActivity"
            android:label="@string/title_activity_display_message"
            android:parentActivityName="com.example.myfirstapp.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.example.myfirstapp.MainActivity" />
        </activity>
    </application>

</manifest>

我已经看到了很少的答案并发布了堆栈溢出并尝试了它们仍然无效当我尝试运行它时，搜索图标永远不会显示出来有人可以建议做什么吗？

Answer 1

在activity_action.xml

中

  <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:(YOUR_PROJECT_NAME)="http://schemas.android.com/apk/res-auto" 
    >


     <!-- Search, should appear as action button -->
   <item android:id="@+id/action_search"
         android:orderInCategory="100"
         android:icon="@drawable/ic_action_search"
         android:title="@string/action_search"
        YOUR_PROJECT_NAME:showAsAction="always" />

图标未显示在操作栏上

1 个答案: