问什么时候在Android中使用ComponentName的构造函数？

EN

ComponentName cn = new ComponentName("de.zordid.sampleapp",
    "de.zordid.sampleapp.widget.WidgetProvider");

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="net.twisterrob.app.android">
    <!--
    `package` above defines the base package for .Names
    to simplify reading/writing the manifest.
    Notice that it's different than the `applicationId` in build.gradle
    and can be independently changed in case you want to refactor your packages.
    This way you can still publish the same app with the same name.
    -->

    <!-- Will be expanded to net.twisterrob.app.android.App in the manifest merging phase. -->
    <application android:name=".App">
        <!-- meta-data needs FQCNs because the merger can't know if you want to expand them or not.
             Also notice that name and value both can contain class names, depending on what you use. -->
        <meta-data android:name="net.twisterrob.app.android.GlideSetup" android:value="GlideModule" />
        <meta-data android:name="android.app.default_searchable" android:value="net.twisterrob.app.android.subpackage.SearchResultsActivity" />
        <!-- Will be expanded to net.twisterrob.app.android.subpackage.Activity in the manifest merging phase. -->
        <activity android:name=".subpackage.Activity" />
        <!-- Needs full qualification because it's not under the package defined on manifest element. -->
        <activity android:name="net.twisterrob.android.activity.AboutActivity" />
        <!-- Will be expanded to net.twisterrob.app.android.content.AppProvider in the manifest merging phase. -->
        <provider android:name=".content.AppProvider" android:authorities="${applicationId}" />
        <!-- Needs full qualification because it's not under the package defined on manifest element. -->
        <provider android:name="android.support.v4.content.FileProvider" android:authorities="${applicationId}.share" />
    </application>
    <!-- ${applicationId} will be replaced with what's defined in `build.gradle` -->
</manifest>

android {
    defaultConfig {
        // this is what will be used when you upload it to the Play Store
        applicationId 'net.twisterrob.app'
    }
    buildTypes {
        debug {
            // The neatest trick ever!
            // Released application: net.twisterrob.app
            // IDE built debug application: net.twisterrob.app.debug
            // This will allow you to have your installed released version
            // and sideloaded debug application at the same time working independently.
            // All the ContentProvider authorities within a system must have a unique name 
            // so using ${applicationId} as authority will result in having two different content providers.
            applicationIdSuffix '.debug'
        }
    }
}

ComponentName smsReceiver = new ComponentName(this, SMSReceiver.class);