Android Studio v3.0.1中<intent-filter>未知元素错误求助

Hey there, let's get this sorted out quickly! That error pops up because your <intent-filter> tag is sitting in an invalid spot within your AndroidManifest.xml file—this element can only exist as a direct child of specific Android components. Here's how to fix it:

• First, jump straight to line 104 in your AndroidManifest.xml and check what parent tag your problematic <intent-filter> is nested under.
• Keep in mind: <intent-filter> is only allowed as a direct child of these components:
  • <activity>
  • <activity-alias>
  • <service>
  • <receiver>
  • <provider>

Example of Wrong vs. Correct Placement #

❌ Incorrect (causes the error):

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher">
    <!-- Intent filter directly under <application> is invalid! -->
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</application>

✅ Correct (places intent filter inside an activity):

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher">
    <activity android:name=".MainActivity">
        <!-- Intent filter is now a valid child of <activity> -->
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

• Double-check for typos too (like forgetting the hyphen in <intent-filter>), but the most common culprit here is definitely incorrect placement.
• After fixing the tag's location, click Sync Project with Gradle Files in Android Studio, then rebuild your project—the error should vanish.

内容的提问来源于stack exchange，提问作者Ghufran