启动各种 App Android

intent = new Intent( );

ComponentName comp = new ComponentName("com.android.mms", "com.android.mms.ui.ConversationList");

intent.setComponent(comp);

intent.setAction("android.intent.action.VIEW");

startActivity(intent); ---启动系统发信息软件，

Intent it = new Intent(Intent.ACTION_VIEW);

it.putExtra("sms_body", "The SMS text");

it.setType("vnd.android-dir/mms-sms");

startActivity(it); --启动系统发信息软件并直接到发信窗口