Android ClassNotFoundException: Why Does My Activity Fail to Launch Despite a Correct Manifest?

Android Activity ClassNotFoundException: A Comprehensive Analysis

Problem Description:

When attempting to launch an application after extracting it into a framework library, an 'Unable to instantiate activity' error occurs, accompanied by 'ClassNotFoundException' for the intended activity class. The manifest file, however, appears correct.

Possible Cause:

This issue stems from an SDK tools update. The crux of the problem lies in how the main Android project references the Android library project.

Wrong Approach:

Adding the Android library project as a dependency in the build path of the main project (via Properties -> Java Build Path -> Projects) may not resolve the issue.

Correct Approach:

To rectify the situation, add the Android library project through the 'Library' section in the 'Android' tab of the main project's Properties dialog box. Utilize a relative path to reference the library project.

Additional Information:

• The specified class file is present in the generated APK's 'classes.dex' file.
• Cleaning and building the project, utilizing a new device image, and switching between library and regular Java projects have not yielded positive results.
• Adding the abstract superclass to the manifest has no impact.
• Attempting to make all dependencies Android library projects has proven ineffective.

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