简单使用Fragment实现页面切换

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1.在activity_main的布局文件中添加

<FrameLayout    android:id="@+id/frag"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_weight="1"></FrameLayout><LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical"    android:layout_alignParentBottom="true">    <RadioGroup        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <RadioButton            style="@style/AppBottom"            android:id="@+id/shou"            android:drawableTop="@drawable/selector_bar_1"            android:checked="true"            android:text="首页"            android:textColor="@drawable/selector_bar_text"            />        <RadioButton            style="@style/AppBottom"            android:id="@+id/fenclass"            android:drawableTop="@drawable/selector_bar_2"            android:text="分类"            android:textColor="@drawable/selector_bar_text"            />        <RadioButton            style="@style/AppBottom"            android:id="@+id/car"            android:drawableTop="@drawable/selector_bar_3"            android:text="购物车"            android:textColor="@drawable/selector_bar_text"            />        <RadioButton            style="@style/AppBottom"            android:id="@+id/user"            android:drawableTop="@drawable/selector_bar_4"            android:text="我的"            android:textColor="@drawable/selector_bar_text"            />    </RadioGroup></LinearLayout>

2.MainAcitivity：

//定义方法在onCreate中调用

private void init() {        fm = getSupportFragmentManager();        f1 = new Home();        f2 = new FenClass();        f3 = new Car();        f4 = new User();        //开启事务        beginTransaction = fm.beginTransaction();//        beginTransaction.replace(R.id.frag,f1);        beginTransaction.add(R.id.frag,f1);        beginTransaction.add(R.id.frag,f2);        beginTransaction.add(R.id.frag,f3);        beginTransaction.add(R.id.frag,f4);        beginTransaction.show(f1);        beginTransaction.hide(f2);        beginTransaction.hide(f3);        beginTransaction.hide(f4);        beginTransaction.commit();    }    @OnClick({R.id.shou, R.id.fenclass, R.id.car, R.id.user})    public void onViewClicked(View view) {        switch (view.getId()) {            case R.id.shou:                               beginTransaction = fm.beginTransaction();                beginTransaction.show(f1);                beginTransaction.hide(f2);                beginTransaction.hide(f3);                beginTransaction.hide(f4);                beginTransaction.commit();                break;            case R.id.fenclass:                beginTransaction = fm.beginTransaction();                beginTransaction.show(f2);                beginTransaction.hide(f1);                beginTransaction.hide(f3);                beginTransaction.hide(f4);                beginTransaction.commit();                break;            case R.id.car:                beginTransaction = fm.beginTransaction();                beginTransaction.show(f3);                beginTransaction.hide(f2);                beginTransaction.hide(f1);                beginTransaction.hide(f4);                beginTransaction.commit();                break;            case R.id.user:                beginTransaction = fm.beginTransaction();                beginTransaction.show(f4);                beginTransaction.hide(f2);                beginTransaction.hide(f3);                beginTransaction.hide(f1);                beginTransaction.commit();                if (isLogin==false){                    Intent intent = new Intent(this, LoginAcitivity.class);                    startActivity(intent);                }        }    }    /*去除（隐藏）所有的Fragment的方法*/    private void hideFragment(FragmentTransaction transaction) {        if (f1 != null) {            //transaction.hide(f1);隐藏方法也可以实现同样的效果，一般使用去除            transaction.remove(f1);        }        if (f2 != null) {            //transaction.hide(f2);            transaction.remove(f2);        }        if (f3 != null) {            //transaction.hide(f3);            transaction.remove(f3);        }        if (f4 != null) {            //transaction.hide(f3);            transaction.remove(f4);        }    }

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