Could not identify launch Activity: Default Activity not found

Question

I'm new to android and I have encounterded a problem. The console said that "Could not identify launch activity: Default Activity not found". I have add

<intent-filter>             <action android:name="android.intent.action.MAIN"/>             <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> 

in manifests. And I have tried Invalidate caches/Restart,still not worked. And the class file which contains the main activity turn green in android studio. I don't know what that means. This is my manifests file.

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.mrrobot.mycoolweather" > <uses-permission android:name="android.permission.INTERNET"/>  <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.mrrobot.mycoolweather.activity.ChooseAreaActivity"         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> 

The chooseAreaActivity is the one I want to use as launcher activity.

Answer 1

For main activity in your manifest you have to add this with category LAUNCHER (First Activity on launch app):

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

For other activity you have to change category to DEFAULT:

<activity     android:name=".OtherActivity"     android:theme="@style/AppTheme.NoActionBar" >     <intent-filter>             <action android:name="package.OtherActivity" />              <category android:name="android.intent.category.DEFAULT" />     </intent-filter> </activity> 

Check this Activity and this Start Another Activity

So your code is:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.mrrobot.mycoolweather" > <uses-permission android:name="android.permission.INTERNET"/>  <application     android:allowBackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:supportsRtl="true"     android:theme="@style/AppTheme" >      <activity         android:name=".activity.ChooseAreaActivity"         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> 

Answer 2

Sometimes it is solved just restarting Android Studio

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I had the "Default Activity not found" problem a couple of times and I could solved restarting my android Studio.