Android activity-alias Guide

The activity-alias attribute is used in the AndroidManifest.xml file to specify an alias for an existing activity component. It can be used in various situations such as:

1. Change the attributes of an existing activity: Use activity-alias to modify the properties of an existing activity, such as changing the label, icon, or theme of the activity.

Original: Je suis vraiment désolé pour ce malentendu.
Paraphrase: I sincerely apologize for this misunderstanding.

<activity-alias
    android:name=".MainActivityAlias"
    android:targetActivity=".MainActivity" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity-alias>

1. Create an alias for an activity: Using activity-aliases allows you to create a nickname for an existing activity, allowing components using that nickname to access the activity.

He is always complaining about his job.

He constantly gripes about his job.

<activity
    android:name=".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-alias
    android:name=".MainActivityAlias"
    android:targetActivity=".MainActivity" >
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="http" />
    </intent-filter>
</activity-alias>

In the example above, when an HTTP link is opened through a browser, the system will match to MainActivityAlias and start MainActivity.

It is important to note that an activity-alias is simply an alias and not an actual activity component. It does not have its own lifecycle and cannot receive its own Intent. It acts as a delegate, forwarding intents to the targetActivity specified activity component.