Android 安卓应用赢得'；t加载设备（三星Galaxy S3手机）或Eclipse'；s AVD仿真器

正在尝试从EclipseJuno中加载示例我的第一个应用程序（HelloWorld）应用程序。Eclipse显示我的设备处于联机状态。手机正在运行Kit Kat 4.4.2。开发人员模式已打开。USB调试已启用

以下是控制台输出：

   [2014-07-02 03:32:15 - MyFirstApp] Android Launch!
    [2014-07-02 03:32:15 - MyFirstApp] adb is running normally.
    [2014-07-02 03:32:15 - MyFirstApp] No Launcher activity found!
    [2014-07-02 03:32:15 - MyFirstApp] The launch will only sync the application package on the device!
    [2014-07-02 03:32:15 - MyFirstApp] Performing sync
    [2014-07-02 03:32:15 - MyFirstApp] Uploading MyFirstApp.apk onto device 'bc176a2b'
    [2014-07-02 03:32:16 - MyFirstApp] Installing MyFirstApp.apk...
    [2014-07-02 03:32:21 - MyFirstApp] Success!
    [2014-07-02 03:32:21 - MyFirstApp] \MyFirstApp\bin\MyFirstApp.apk installed on device
    [2014-07-02 03:32:21 - MyFirstApp] Done!

Absolutely nothing from the hello world app shows up on the phone.  It just continues to display the home screen.

When I try to use Eclipse's AVD to run the app, I get the following Console output:
    [2014-07-02 03:34:48 - MyFirstApp] ------------------------------
    [2014-07-02 03:34:48 - MyFirstApp] Android Launch!
    [2014-07-02 03:34:48 - MyFirstApp] adb is running normally.
    [2014-07-02 03:34:48 - MyFirstApp] No Launcher activity found!
    [2014-07-02 03:34:48 - MyFirstApp] The launch will only sync the application package on the device!
    [2014-07-02 03:34:48 - MyFirstApp] Performing sync
    [2014-07-02 03:34:49 - MyFirstApp] Application already deployed. No need to reinstall.
    [2014-07-02 03:34:49 - MyFirstApp] \MyFirstApp\bin\MyFirstApp.apk installed on device
    [2014-07-02 03:34:49 - MyFirstApp] Done!

虽然emulator对话框（屏幕）已加载，但应用程序未加载。因此emulator对话框停留在主屏幕上

请告知

以下是AndroidManifest.xml：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />

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

</manifest>

---

在android清单中使用此选项

<activity
            android:name="youractivityname"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

编辑您的android清单，并在Activity中添加意图过滤器请提供您的AndroidMAnifest.xml源代码