ComponentName

ComponentName（组件名称）是用来打开其他应用程序中的Activity或服务的。

Identifier for a specific application component (Activity, Service, BroadcastReceiver, or ContentProvider) that is available. Two pieces of information, encapsulated here, are required to identify a component: the package (a String) it exists in, and the class (a String) name inside of that package.

用法：

    ComponentName cn=new ComponentName("com.example.myapp", "com.example.myapp.MainActivity");  
    Intent intent = new Intent();  
    intent.setComponent(cn); 
    startActivityForResult(intent,1);