<meta-data/> 标签的作用

标签应用示例： 
<activity
        android:name="Settings$SimSettingsActivity"
        android:label="@string/sim_settings_title"
        android:icon="@drawable/ic_settings_sim"
        android:exported="false"
        android:configChanges="orientation|screenSize|smallestScreenSize|screenLayout|keyboardHidden|mcc|mnc"
        android:parentActivityName="Settings">
        <intent-filter android:priority="1">
            <action android:name="com.android.settings.sim.SIM_SUB_INFO_SETTINGS" />
            <category android:name="android.intent.category.DEFAULT" />
         </intent-filter>
         <intent-filter>
             <action android:name="com.android.settings.action.SETTINGS" />
         </intent-filter>
         <meta-data android:name="com.android.settings.order" android:value="-2"/>
         <meta-data android:name="com.android.settings.category"
             android:value="com.android.settings.category.ia.wireless" />
         <meta-data android:name="com.android.settings.summary"
             android:resource="@string/summary_empty"/>
         <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
             android:value="com.mediatek.settings.sim.SimSettings" />
          <meta-data android:name="com.android.settings.icon"
                     android:resource="@drawable/ic_settings_sim" /><!-- [CS22][BUG NULL]sim icon no display, tony 2023.01.10-->
     </activity>  

标签作用详解：