我在啓動我的應用程序時遇到問題,因爲它向我提供了「未找到默認活動」錯誤。我已閱讀其他線程,並嘗試添加/更改以下代碼的位置:未找到默認活動錯誤Android Studio
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name = "android.intent.category.LAUNCHER" />
</intent-filter>
但它仍然不起作用。我也試過
File -> Invalidate Caches/Restart...
仍然不起作用。以下是我的Android Manifest.xml文件。我想用名爲「.Main2Activity」的活動啓動我的應用程序。另外請注意,出於某種原因,設計模式下的.xml文件顯示爲黑色背景,並且有些奇怪。
<?xml version="1.0" encoding="utf-8"?>
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature
android:name="android.hardware.camera"
android:required="true" />
<activity android:name=".MainActivity" />
</activity>
<activity android:name=".Dining" />
<activity android:name=".SignUp" />
<provider
android:name="android.s
upport.v4.content.FileProvider"
android:authorities="com.example.android.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@layout/file_paths" />
</provider>
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="AIzaSyD37TQWZ02Re5_3lTH-kL17cOOVQw1B8dY" />
<activity>
android:name=".MapsActivity"
android:label="@string/title_activity_maps" />
<activity android:name=".Main2Activity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name = "android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MapsMain"></activity>
</application>