Android Studio is showing an error when I press the run button

Question

I have been following a YouTube tutorial on 2D Game development and when I pressed the run button to check, it shows:

Error runing "app": Default Activity not found

Also it shows an error on AndroidMainfest.xml if I use landscape instead of fullsensor:

<activity android:name=".GameActivity"
   android:screenOrientation="landscape"
   android:theme="@style/AppTheme.noActionBar"></activity>
<activity
   android:name=".MainActivity"
   android:screenOrientation="landscape"
   android:theme="@style/AppTheme.noActionBar"></activity>

@CoolMind it says Expecting android : screenOrientation= "unspecified" or "fullsensor" for this activity so the user can use the application in any orientation and provide a great experience Chorme OS devices — Mashfiq Abu, Mar 31 '20 at 12:51
You can remove `android:screenOrientation="landscape"` at all. — CoolMind, Mar 31 '20 at 15:19
I mean that `screenOrientation` is an optional attribute. You can delete a whole string `android:screenOrientation="landscape"` or retain it, if you wish. I suppose, that was not an error, but a warning. — CoolMind, Mar 31 '20 at 16:49

score 2 · Answer 1 · answered Mar 31 '20 at 11:47

Use intent-filter:

<activity
    android:name=".MainActivity"
    android:screenOrientation="landscape"
    android:theme="@style/AppTheme.NoActionBar"
    >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

And why @style/AppTheme.noActionBar? Use @style/AppTheme.NoActionBar.

See also "Default Activity Not Found" on Android Studio upgrade.

Android Studio is showing an error when I press the run button

1 Answers1