Error when using activities in a child package

Question

I have a problem in my Android project on Eclipse. After implementing the functionalities, I reached a total of 10 activities and 8 other classes. From there I realized the need to structure the code and created child packages within the project package:

Remembering that in order for Eclipse to display packages in this way I changed the view mode of packages to display by hierarchy.

Inside the activities package I put all the activities of the project. When saving everything and running I get the following error:

01-03 19:59:59.630: E/AndroidRuntime(361): FATAL EXCEPTION: main
01-03 19:59:59.630: E/AndroidRuntime(361): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.meu_projeto/com.example.meu_projeto.MainActivity}: java.lang.ClassNotFoundException: com.example.meu_projeto.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.meu_projeto-1.apk]
01-03 19:59:59.630: E/AndroidRuntime(361):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)

I’ve tried to make that change in Androidmanifest.xml:

Before:

   <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

Then I changed this line:

android:name=".activities.MainActivity"

But it didn’t help, someone can help?

Answer 1

Your Mainactivity class package is wrong. Change the "name" attribute of your Mainactivity class on your Androidmanifest.xml by going as follows:

Before:

<activity
    android:name=".MainActivity"
    android:label="@string/title_activity_main" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

Then just change this line:

android:name="com.example.meu_projeto.activities.MainActivity"

You should apply this change to Androidmanifest.xml for all activities in the child package.