<activity android:name=".SecondActivity"
            android:launchMode="singleInstance">
            <intent-filter>
                <action android:name="cn.edu.xjau.activitytest1.ACTION_START" />
                
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="cn.edu.xjau.activitytest1.OK" />
            </intent-filter>
        </activity>