Error type 3 ,i have already declared launcher activity and also done gradle

Question

Error while executing: am start -n

"com.example.myapplication/com.example.myapplication.Detail" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.myapplication/.Detail } Error type 3 Error: Activity class {com.example.myapplication/com.example.myapplication.Detail} does not exist.

Error while Launching activity

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">

<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/AppTheme">

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

    </activity>
    <activity android:name=".Detail"
        android:label="SQLite Example - Details"></activity>
</application>

</manifest>

Ehsan Hasin Ehsan Hasin · Accepted Answer · 2019-10-04T02:32:03

It is a easy problem which is happened when you migrate to androidX (at least it happened for me by this reason). An easy solution is:

making a new project (same package name as the current one)
go to app\src\main and delete all files in main directory (for this new project)
go to app\src\main and copy all files in main directory (for the old project)
past the files in app\src\main directory (the new project)
run the new project

Error type 3 ,i have already declared launcher activity and also done gradle

1 Answers