Activity转换为View

FrameLayout container = (FrameLayout) findViewById(R.id.Container);
ActivityGroup atGroup;
Intent intent = new Intent(atGroup, aa.class);
// Activity 转为 View
Window subActivity = atGroup.getLocalActivityManager().startActivity(aa.getName(), intent);

// 容器添加View
View view = subActivity.getDecorView();

container.addView(view);