不使用ViewPager实现Fragment切换

见到一种不依赖viewpager实现多个fragment来回切换的实现，潜意识里认为能减少不少出问题的因素。在这里做下记录。

布局文件：

<!--activity_sleep_data.xml-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tl="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    tools:context="com.meddo.zzh.bed.SleepDataActivity">

    <include layout="@layout/title_bar_bg_white" />

    <com.flyco.tablayout.SegmentTabLayout
        android:id="@+id/segment_tab_layout"
        android:layout_width="match_parent"
        android:layout_height="35dp"
        android:layout_gravity="center_horizontal"
        tl:tl_indicator_color="@color/colorPrimary"
        tl:tl_indicator_corner_radius="0dp"
        tl:tl_tab_padding="20dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="horizontal">

        <fragment
            android:id="@+id/fragment_heart"
            class="com.meddo.zzh.bed.HeartFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></fragment>

        <fragment
            android:id="@+id/fragment_breath"
            class="com.meddo.zzh.bed.BreathFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></fragment>

        <fragment
            android:id="@+id/fragment_off_bed"
            class="com.meddo.zzh.bed.OffBedFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></fragment>

        <fragment
            android:id="@+id/fragment_turn_over"
            class="com.meddo.zzh.bed.TurnOverFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></fragment>
    </LinearLayout>

</LinearLayout>

代码：

public class SleepDataActivity extends BaseActivity {
    private SegmentTabLayout mSegmentTabLayout;
    private FragmentManager mFragmentManager;
    private Fragment[] fragments;
    private int[] mFragmentIds = new int[]{R.id.fragment_heart, R.id.fragment_breath,
            R.id.fragment_off_bed, R.id.fragment_turn_over};

    @Override
    public void initView() {
        setContentView(R.layout.activity_sleep_data);
        mSegmentTabLayout = (SegmentTabLayout) findViewById(R.id.segment_tab_layout);
        mSegmentTabLayout.setTabData(new String[]{"心率", "呼吸", "离床", "体动"});
        mFragmentManager = getSupportFragmentManager();
        fragments = new Fragment[]{mFragmentManager.findFragmentById(mFragmentIds[0]),
                mFragmentManager.findFragmentById(mFragmentIds[1]),
                mFragmentManager.findFragmentById(mFragmentIds[2]),
                mFragmentManager.findFragmentById(mFragmentIds[3]),};
        mSegmentTabLayout.setOnTabSelectListener(new OnTabSelectListener() {
            @Override
            public void onTabSelect(int position) {
                for (int i = 0; i < fragments.length; i++) {
                    mFragmentManager.beginTransaction().hide(fragments[i]).commit();
                }
                FragmentTransaction transaction = mFragmentManager.beginTransaction();
                transaction.show(fragments[position]);
                transaction.commit();
            }

            @Override
            public void onTabReselect(int position) {
            }
        });
    }
}

直接从项目中复制的代码。(SegmentTabLayout是tabar控件，点击切换fragment。详见FlycoTabLayout)