无法找到显式活动 class {}; 你有没有在你的 AndroidManifest.xml 地图中声明这个活动 API 不工作g；（Java ZE846DZDBC9AB870

Question

I have developed a simple app that allows users to login to a maps API and navigate around town. I do not know why it is not working like this is the error,

    android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.vumaps/com.example.vu.MapActivity}; have you declared this activity in your AndroidManifest.xml?

then in mainactivity I have this and nothing is wrong. The app launches, allows me to use log in screen then crashes after login. Do u know why it does not work? there are zero errors in code except for this one:

<?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:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.vumaps" >

    <!--
         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="Just pretent the API key is here" />

    <activity
        android:name=".MapActivity"
        android:exported="true"
        android:label="@string/title_activity_maps" />
    <activity
        android:name=".MainActivity"
        android:exported="true" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

//villanova university app dev

More codes

if(username.getText().toString().equals("Student") && password.getText().toString().equals("Student")){ //correct Intent intent = new Intent(MainActivity.this, idkWhatToPutHere.MapActivity.class); startActivity(intent);

Answer 1

Your package name in the manifest is com.example.vumaps. Your fully qualified class name is com.example.vu.MapActivity. Using.MapActivity tells it to look for a class relative to the package name. Since this doesn't match, it can't find the activity in the manifest. To fix this, either rename the package of.MapActivity, or use the fully qualified name instead of.MapActivity.