如何定义android 启动的activity,AndroidManifest.xml里面定义的Activity是根据哪一个信息来确定是应用默认启动的啊？...

package="com.ucloud.uvod.example"

android:installLocation="internalOnly" >

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:theme="@style/BlueTheme" >

android:name="com.ucloud.uvod.example.MainActivity"

android:label="@string/app_name"

android:launchMode="singleTask"

android:theme="@style/BlueTheme"

android:screenOrientation="sensor" >

android:name="com.ucloud.uvod.example.impl.UEasyPlayerActivity"

android:configChanges="keyboardHidden|orientation|screenSize"

android:label="@string/app_name"

android:launchMode="singleTask"

android:screenOrientation="sensor"

android:theme="@style/FullscreenTheme" >

android:name="com.ucloud.uvod.example.impl.UVideoViewActivity"

android:configChanges="keyboardHidden|orientation|screenSize"

android:label="@string/app_name"

android:launchMode="singleTask"

android:screenOrientation="sensor"

android:theme="@style/FullscreenTheme" >

android:name="com.ucloud.uvod.example.permission.PermissionsActivity"

android:screenOrientation="portrait"

android:launchMode="singleTask"

android:theme="@style/BlueTheme"/>

如果Activity里面配置了

就是程序的入口吗？