Android: Unable to find explicit activity class… startActivity from a PreferenceActivity

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I had this problem too. If you read carefully the error on the logcat, you will know what to do.

You have to declare the activity in the AndroidManifest.xml

    <activity
        android:name=".TheNameOfMyActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

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