我在启动我的应用程序时遇到问题,因为它向我提供了“未找到默认活动”错误。我已阅读其他线程,并尝试添加/更改以下代码的位置:未找到默认活动错误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。我也试过
File -> Invalidate Caches/Restart...
仍然不起作用。以下是我的Android Manifest.xml文件。我想用名为“.Main2Activity”的活动启动我的应用程序。另外请注意,出于某种原因,设计模式下的.xml文件显示为黑色背景,并且有些奇怪。
<?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>