Android：使用Intent或intent-filter启动活动

Question

I always start activities with Intents, but in the book which I'm reading an activity is started with an action parameter: Not in this classical way

Intent intent = new Intent(this,ActivityResult.class);

But in this way:

String PICK_BUS_ACTION = "com.example.utente.decompilare" + ".action.PICK_BUS_ACTION";
Intent intent = new Intent(PICK_BUS_ACTION);

And in the manifest there is an intent-filter:

<activity android:name=".ActivityResult">
        <intent-filter>
            <action android:name="com.example.utente.decompilare.action.PICK_BUS_ACTION" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

I tried both the ways but I didn't find differences. What is better? What is the difference?

Answer 1

第二个用于启动另一个应用程序。