Android : No Launcher activity found!

[2011-12-09 15:02:58 - HQTDvr] Android Launch!
[2011-12-09 15:02:58 - HQTDvr] adb is running normally.
[2011-12-09 15:02:58 - HQTDvr] No Launcher activity found!
[2011-12-09 15:02:58 - HQTDvr] The launch will only sync the application package on the device!
[2011-12-09 15:02:58 - HQTDvr] Performing sync
[2011-12-09 15:02:58 - HQTDvr] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'Android-2.2'

突然调试不了了，开始以为是模拟器出错了。用手机也还是一样。重启了系统也不行，很郁闷着。

后来再仔细一看 no activity found ，应该是没有找到启动的Activity，再查看应用程序配置文件，原来是两个 </activity> 跑到一块了，一不小心引起的。。

        <activity
            android:label="@string/app_name"
            android:name=".demo.FormMain" >

这个地方的被我不小心移到后面去了。
        <activity android:name=".demo.FormVideo">
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

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