Default activity not found android studio ошибка

I just experienced the same error in Android Studio 1.5.1. and just found the source of the problem. I am not sure whether the cause was a human error or some strange glitch in the behaviour of the IDE, but none of the existing StackOverflow questions about this subject seemed to show anything about this so I figured I post it as an answer anyway.

For me, either one of my team members or the IDE itself, had changed the launcher activities manifest entry, causing it to look like this:

        <activity
            android:name="com.rhaebus.ui.activities.ActivitySplash"
            android:launchMode="singleInstance"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <id android:name="android.intent.id.LAUNCHER" />
            </intent-filter>
        </activity>

While it should, in fact, look like this:

        <activity android:name="com.rhaebus.ui.activities.ActivitySplash"
            android:launchMode="singleInstance"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" /> <!-- Change Here -->
            </intent-filter>
        </activity>

So please double, triple, quadruple check the format of your launcher activity in the manifest and you might be able to save yourself some time.

Hope this helps.

EDIT:
I strongly suggest people not to go with the answers that suggest to manually select a launcher activity inside the configuration options of your module, as this caused the application to no longer be shown in the list of installed apps on both the Samsung Galaxy S5 Neo and the Samsung Galaxy S6 (at least for me).

This is the most common issue faced by so many developers when creating a new Android Studio Project. This issue occurs because Android Studio was not able to detect the default MainActivity in your Android Studio Project. In this article, we will take a look at four different ways with which we can fix this error in your Android Project. 

Pre Requisites: You should be having your Android Studio project build which is showing this type of error as Default Activity not found.

Method 1: Cleaning your project

In this method, we will be cleaning our whole project and sync all the Gradle files because Android Studio sometimes doesn’t detect the Activity. So we will be cleaning the tour project in this method. For cleaning our Android Studio project. Navigate to the Build option in the top bar and then click on it and after that, you will get to see an option to Clean your Project. Click on that option to clean your project. The option is shown below screenshot. 

Method 2: Cleaning and Rebuilding your Project

In this method, we will be cleaning as well as rebuilding our project. After cleaning our project sometimes our files in the Android Studio project are rearranged. So to arrange these files in a proper manner we have to rebuild our project. In this project first of all we have to clean our project as shown in Method 1 and then after Rebuild your project. For Rebuilding your project click on the Build option in the top bar and then click on the Rebuild Project option to rebuild your project. The screenshot is shown below for these options. 

Method 3: Restarting your project using Invalidate Caches and Restart option

In this method, we will be restarting our project using Invalidate Caches and Restart option. For using this option navigate to the File option and then click on Invalidate Caches and Restart option you will get to see this option in the below screenshot. 

After clicking on this option you will get to see the below screenshot. In this click on Invalidate Caches and Restart option to Restart your Android Studio project. 

Method 4: Check the Manifest file for your launcher Activity

In this method, we will verify if our Activity name is declared in our Manifest file or not. For checking this we simply have to Navigate to the Manifest file and check your Manifest file if your Activity name is mentioned in that file or not. The code for a sample Manifest file is given below. Comments are added in the code to get to know in detail. 

 After updating the code for your AndroidManifest.xml file. Now run your app and it will work properly. 

Assuming your AndroidManifest.xml is setup properly.

<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
    <application ...>
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <action android:name="android.intent.action.VIEW" />

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

You can try changing Android Studio -> Run -> Edit Configurations, at Android App -> app -> General -> Launch Options, changed from Default Activity to Specific Activity then pick and activity. If the problem still persist, then this is a Android Studio problem and not a configuration issue.

NOTE: You can also try opening other Android projects.

Solutions

You might need to try one or more of the following solutions.

1. Android Studio -> File -> Invalidate Caches / Restart ...
2. Android Studio -> Build -> Clean Project / Rebuild Project
3. Android Studio -> File -> Sync Project with Gradle files
4. Close Android Studio, goto C:Users[USER].AndroidStudio3.3system and delete caches directory.

NOTE: Solution 4 work for my case.

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✨ By Desmond Lua

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⚠️ Error: Default Activity not found

If you are trying to run an Android Application on a Device or Emulator and you get the above error message (this can occur on both Android Studio and Eclipse IDE) then the most probable reason for this is the missing launcher activity in AndroidManifest.xml file.

Every Android Application must one application tag in the Manifest file and within it, there must be an Activity with <intent-filter> tag with action and category sub-tags. Whichever activity has these tags within it is the Launcher/Default activity which gets loaded when the App is run on a device.

Note you can have more than once activity with <intent-filter> tags in it, in such a scenario you would find App launcher icons when the App is installed on the device.

File : AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.code2care.tools.jsonwithandroid" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Note that the Activity tag should be inside the <application> </application> tag.

Android Studio Error — Default Activity not found