android程序安装后在模拟器上不显示，并且控制台显示The launch will only sync the application package on the device!

<application 
        android:allowBackup="true" 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" 
        android:theme="@style/AppTheme"> 

        <activity 
            android:name="com.lovemu.textview.MainActivity" 
            android:label="@string/app_name"> 

            <intent-filter> 
                <!--标识Activity为一个程序的开始--> 
                <actionandroid:name="android.intent.action.MAIN"/> 

                <!--决定应用程序是否显示在程序列表里--> 
                <categoryandroid:name="android.intent.category.LAUNCHER"/> 

            </intent-filter> 
        </activity> 
    </application>

@Override 
    protectedvoid
onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.linearlayout); 
    }