adt20 建立Android工程的时候报错 No Launcher activity found

Question

adt20 建立Android工程的时候报错 No Launcher activity found<application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.qqqq.Abc"
            android:label="@string/title_activity_main" 
            android:exported="false">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.HOME"/>
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            
        </activity>
    </application>

Answer 1

android:exported="false"
这里要是true..
谁能解释下这个属性么？？？

Answer 2

android:name="com.example.qqqq.Abc"改成android:name=".Abc"看看