Develop Reference

"Error running app: Default Activity not Found"

I'm programming an app with sqlite+JSON, but suddenly I couldn't Run it anymore, and it popped this message, here's my AndroidManifest.xml , Idk if there's something wrong with it, my main activity is called DatosActivity, I wish you could help me.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hitan.practica2_u3">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name="com.example.hitan.practica2_u3.DatosActivity"
android:theme="#style/AppTheme.NoActionBar"></activity>
</application>
</manifest>

You should add category.LAUNCHER & action.MAIN .
<activity
android:name="com.example.hitan.practica2_u3.DatosActivity"
android:theme="#style/AppTheme.NoActionBar"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

This error is coming because you have not added the default screen which should execute first. So try adding following code snippet, and your problem will be solved:
<activity
android:name="com.example.hitan.practica2_u3.DatosActivity"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Hope it helps.

Please Add Intent Filter Tag in Manifest To Make It Default while Launching.

Add this intent filter inside your activity tag
<activity
android:name="com.example.hitan.practica2_u3.DatosActivity"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Android manifest merging: removing LAUNCHER intent-filter doesn't take effect

In my android app I use a library project and I use one of it's activities. However in the library project that activity has MAIN action and LAUNCHER category intent-filter. So I added that activity to my manifest and removed the intent-filter. The manifests seem to be correctly merged into build/intermediates/manifests/full/debug/AndroidManifest.xml, and the activity looks as expected (without the intent-filter):
<activity
android:name="com.michaelrnovak.util.logger.Logger"
android:configChanges="orientation"
android:label="#string/show_log" >
</activity>
However when I start the app from AndroidStudio in the emulator, then instead of my AlertsActivity, the library's Logger activity is launched. What am I doing wrong?
This is the manifest of the library:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.michaelrnovak.util.logger"
android:versionCode="8"
android:versionName="1.5">
<uses-permission android:name="android.permission.READ_LOGS" />
<application
android:icon="#drawable/icon"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity android:name=".Logger"
android:label="#string/app_name"
android:configChanges="orientation">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
and my app's manifest has the following relevant activity definitions:
<activity
android:name=".AlertsActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /> </intent-filter>
</activity>
<activity android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
>
<intent-filter tools:node="removeAll" />
</activity>

Have you tried tools:node="remove" on the category node only? From my experience, it seems to work.
Something like this:
<activity android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
>
<intent-filter>
<category tools:node="remove" android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>

I tried many ways on similar situation like you. I figured out that I must add tools:node="replace" in the Activity node to remove intent-filter's specific action and category. Try this :)
<activity
android:name="com.michaelrnovak.util.logger.Logger"
android:label="#string/show_log"
android:configChanges="orientation"
tools:replace="android:label"
tools:node="replace">
<!-- Rewrite the intent-filter you want -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

No Launcher activity found! - Android

I am getting a No Launcher activity found! error while launching my Andoid Application. My AndroidManifest.xml file has a LAUNCHER tag defined. I am not clear why I am getting this error though.
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.test.Menu"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.test.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.test.Class1"
android:label="#string/app_name">
</activity>
<activity
android:name="com.example.test.Class2"
android:label="#string/app_name">
</activity>
</application>
Can anyone advise the cause for this error ?

Replace
<action android:name="com.example.test.MAIN" />
with
<action android:name="android.intent.action.MAIN" />

android: No Launcher activity found

My AndroidManifest.xml is like the followings:
<application android:label="droid VNC server" android:icon="#drawable/icon"
android:name="MainApplication" android:debuggable="true">
<activity android:name=".MainActivity" android:launchMode="singleInstance"
android:label="#string/app_name" android:icon="#drawable/icon">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="org.onaips.vnc.ACTIVITY_UPDATE" />
</intent-filter>
</activity>
</application>
I already set the following two lines:
Why I still get the errors
No Launcher activity found
The launch will only sync the application package on the device
Thanks

Your intent-filter tag in xml file should exactly be like this:
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
Place it inside <activity> tag and you should be ok

Remove the line
<action android:name="org.onaips.vnc.ACTIVITY_UPDATE" />
Because there are 2 similar lines, the 2nd line is usually considered. (Ambiguity). So just remove that line, and you will see the app in the launcher!

Android: No Launcher activity found! was working before

I have the same problem everyone reports but this began happening suddenly. My app was working as expected, automatically launching the MAIN activity.
But all of the sudden it stopped working and I started seeing the No Launcher activity found! message.
This is my Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xitrica.android">
<uses-permission android:name="android.permission.INTERNET" />
<uses-sdk android:minSdkVersion="8" />
<application android:icon="#drawable/icon" android:label="#string/app_name"
android:theme="#style/Theme.Transparent">
<uses-library android:name="com.google.android.maps" android:required="true" />
<activity android:name="ElBusetonActivity" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="andoid.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="RouteInfoActivity"></activity>
<activity android:theme="#android:style/Theme.Translucent.NoTitleBar"
android:name="GetDirectionsActivity"></activity>
<activity android:theme="#android:style/Theme.Dialog"
android:name="PointProviderList"></activity>
</application>
</manifest>
Sorry if I'm not posting this snippet correctly. It's the first time I ever post a question.
Thanks in advance.

<activity android:name=".ElBusetonActivity" android:label="#string/app_name">
try this, prefix (".") on activity name
here (.) refer to package path

Remove
category android:name="android.intent.category.DEFAULT"
as it is not required.

Say if you have the Activity names TestActivity
If you want the TestActivity to be the first to launch when you hit "run", simply add two lines:
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
To the position like below in your AndroidManifest.xml:
<activity
android:name="TestActivity"
android:label="#string/name"
android:screenOrientation="portrait" >
<intent-filter android:label="#string/app_name" >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

use the dot before the activities in your manifest to declare it. or you can write the package name dot your activity name.
like this.........
<activity android:name=".ElBusetonActivity" android:label="#string/app_name">
if you not using package name then it decide the default one.