一个APK里启动外部APK或者外部APK的一个服务

	private static final String apkPack = "com.example.demo";
	private static final String apkActivity = "com.example.activity.MainActivity";
	private static final String apkService = "com.example.service.test";

	private void runExActivity(){
		Intent intent = new Intent();
		ComponentName cn = new ComponentName(apkPack, apkActivity);
		intent.setComponent(cn);
		intent.setAction("android.intent.action.MAIN");
		startActivity(intent);
	}

	private void runExService(){
		Intent intent = new Intent();
		ComponentName cn = new ComponentName(apkPack, apkService);
		intent.setComponent(cn);
		startService(intent);
	}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.demo"   <!-- package -->
    android:versionCode="3"
    android:versionName="1.2" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:name="com.example.utils.App"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.activity.MainActivity"   <!-- activity -->
            android:label="@string/app_name"
            android:launchMode="singleTask"
            android:theme="@android:style/Theme.NoTitleBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" /> <!-- 去掉则该apk不显示图标 -->
            </intent-filter>
        </activity>

        <service
            android:name="com.example.service.test"  <!-- 服务名称 -->
            android:enabled="true"
            android:exported="true" >
        </service>
    </application>

</manifest>