Activity跳转到Fragment实现

在想要跳转的那个activity中写

private void switchFragment(Fragment f) {

    FragmentManager fragmentM = getSupportFragmentManager();//管理对象
    FragmentTransaction trans = fragmentM.beginTransaction();//切换碎片
    trans.replace(R.id.activity_pai_she, f);
    trans.commit();
}

在点击跳转的地方写 switchFragment(new FristFragment());