android fragment动态显示隐藏

public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private FrameLayout frameLayout;    private Button btnLogin;    private Button btnZhuCe;    private LoginFragment f1;    private ZhuCeFragment f2;    @Override        protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        frameLayout = (FrameLayout) findViewById(R.id.fl);        btnLogin = (Button) findViewById(R.id.btn_login);        btnZhuCe = (Button) findViewById(R.id.btn_zhuce);        btnLogin.setOnClickListener(this);        btnZhuCe.setOnClickListener(this);        initFragment1();    }    private void initFragment1(){        //开启事务，fragment的控制是由事务来实现的        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();        //第一种方式（add），初始化fragment并添加到事务中，如果为null就new一个        if(f1 == null){            f1 = new LoginFragment();            transaction.add(R.id.fl, f1);        }        //隐藏所有fragment        hideFragment(transaction);        //显示需要显示的fragment        transaction.show(f1);        //第二种方式(replace)，初始化fragment//        if(f1 == null){//            f1 = new MyFragment("消息");//        }//        transaction.replace(R.id.main_frame_layout, f1);        //提交事务        transaction.commit();    }    //显示第二个fragment    private void initFragment2(){        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();        if(f2 == null){            f2 = new ZhuCeFragment();            transaction.add(R.id.fl,f2);        }        hideFragment(transaction);        transaction.show(f2);//        if(f2 == null) {//            f2 = new MyFragment("联系人");//        }//        transaction.replace(R.id.main_frame_layout, f2);        transaction.commit();    }    //隐藏所有的fragment    private void hideFragment(FragmentTransaction transaction){        if(f1 != null){            transaction.hide(f1);        }        if(f2 != null){            transaction.hide(f2);        }    }    @Override    public void onClick(View view) {            if(view == btnLogin){                initFragment1();            }else if(view== btnZhuCe){                initFragment2();            }    }}
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