android中从activity跳转到指定fragment

先跳转到fragement所在的activity,在根据情况判断该显示哪个fragment

Intent intent = new Intent( this,MainActivity. class);

intent.putExtra( "id", 1);

startActivity(intent);

//singleInstance模式,返回时选择fragment的显示

protected void onRestart() { Log. e( "zz", "onRestart");

int id= getIntent().getIntExtra("id",  0);

if（id==1）{

addFragment( my_f );       showFragment( my_f ); } super.onRestart(); }