添加片段后,BottomNavigationView不在底部

概述我是android的初学者,今天我创建了一个BottomNavigationView活动,我想显示3个带有导航按钮的选项卡,所以我创建了3个片段,问题是添加片段后,BottomNavigationView在顶部side中显示了什么我应该怎么做,如果我想像添加片段之前一样将BottomNavigationView放在底部 这是我的主要活动

我是android的初学者,今天我创建了一个BottomNavigationVIEw活动,我想显示3个带有导航按钮的选项卡,所以我创建了3个片段,问题是添加片段后,BottomNavigationVIEw在顶部sIDe

中显示了什么我应该怎么做,如果我想像添加片段之前一样将BottomNavigationVIEw放在底部
 这是我的主要活动代码

package com.HackerinsIDe.jaisonjoseph.polysocial;import androID.os.Bundle;import androID.support.annotation.NonNull;import androID.support.design.Widget.BottomNavigationVIEw;import androID.support.design.Widget.TabLayout;import androID.support.v7.app.AppCompatActivity;import androID.vIEw.MenuItem;import androID.Widget.TextVIEw;public class MainActivity extends AppCompatActivity {private TextVIEw mTextMessage;public BottomNavigationVIEw.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener        = new BottomNavigationVIEw.OnNavigationItemSelectedListener() {    @OverrIDe    public boolean onNavigationItemSelected(@NonNull MenuItem item) {        switch (item.getItemID()) {            case R.ID.navigation_home:                tab1 radio = new tab1();                androID.support.v4.app.FragmentManager manager = getSupportFragmentManager();                manager.beginTransaction().replace(R.ID.container, radio, radio.getTag()).commit();            case R.ID.navigation_dashboard:                tab2 radio1 = new tab2();                androID.support.v4.app.FragmentManager manager1 = getSupportFragmentManager();                manager1.beginTransaction().replace(R.ID.container, radio1, radio1.getTag()).commit();            case R.ID.navigation_notifications:                tab3 radio2 = new tab3();                androID.support.v4.app.FragmentManager manager2 = getSupportFragmentManager();                manager2.beginTransaction().replace(R.ID.container, radio2, radio2.getTag()).commit();        }        return false;    }};@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    tab1 radio = new tab1();    androID.support.v4.app.FragmentManager manager = getSupportFragmentManager();    manager.beginTransaction().replace(R.ID.container, radio, radio.getTag()).commit();    BottomNavigationVIEw navigation = (BottomNavigationVIEw) findVIEwByID(R.ID.navigation);    navigation.setonNavigationItemSelectedListener(mOnNavigationItemSelectedListener);} }

这是activity_main.xml

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:app="http://schemas.androID.com/apk/res-auto"xmlns:tools="http://schemas.androID.com/tools"androID:ID="@+ID/container"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:orIEntation="vertical"tools:context="com.HackerinsIDe.jaisonjoseph.polysocial.MainActivity"><FrameLayout    androID:ID="@+ID/content"    androID:layout_wIDth="match_parent"    androID:layout_height="0dp"    androID:layout_weight="1"    androID:background="@androID:color/holo_blue_dark">    <TextVIEw        androID:ID="@+ID/message"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content"        androID:layout_marginBottom="@dimen/activity_vertical_margin"        androID:layout_marginleft="@dimen/activity_horizontal_margin"        androID:layout_marginRight="@dimen/activity_horizontal_margin"        androID:layout_margintop="@dimen/activity_vertical_margin"        androID:text="@string/Title_home" /></FrameLayout><androID.support.design.Widget.BottomNavigationVIEw    androID:ID="@+ID/navigation"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:layout_gravity="bottom"    androID:background="?androID:attr/windowBackground"    app:menu="@menu/navigation" />

这是我的第一个片段tab1

<FrameLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"xmlns:app="http://schemas.androID.com/apk/res-auto"tools:context="com.HackerinsIDe.jaisonjoseph.polysocial.tab1"><!-- Todo: Update blank fragment layout --><TextVIEw    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:text="@string/hello_blank_fragment" /><button    androID:ID="@+ID/button"    androID:layout_wIDth="wrap_content"    androID:layout_height="wrap_content"    androID:text="button" />

解决方法:

BottomNavigationVIEw不会自动显示在视图底部.您必须手动放置它们.
您可以为此使用relativeLayout.

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:app="http://schemas.androID.com/apk/res-auto"  xmlns:tools="http://schemas.androID.com/tools"  androID:ID="@+ID/container"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  tools:context="com.HackerinsIDe.jaisonjoseph.polysocial.MainActivity">  <FrameLayout      androID:ID="@+ID/content"      androID:layout_wIDth="match_parent"      androID:layout_height="0dp"      androID:layout_weight="1"      androID:background="@androID:color/holo_blue_dark">      <TextVIEw          androID:ID="@+ID/message"          androID:layout_wIDth="match_parent"          androID:layout_height="wrap_content"          androID:layout_marginBottom="@dimen/activity_vertical_margin"          androID:layout_marginleft="@dimen/activity_horizontal_margin"          androID:layout_marginRight="@dimen/activity_horizontal_margin"          androID:layout_margintop="@dimen/activity_vertical_margin"          androID:text="@string/Title_home" />  </FrameLayout>  <androID.support.design.Widget.BottomNavigationVIEw      androID:ID="@+ID/navigation"      androID:layout_wIDth="match_parent"      androID:layout_height="wrap_content"      androID:layout_gravity="bottom"      androID:background="?androID:attr/windowBackground"      androID:layout_alignParentBottom="true"      app:menu="@menu/navigation" /></relativeLayout>

如果将您的根linearLayout更改为relativeLayout并将参数androID：layout_alignParentBottom =“ true”添加到您的BottomNavigationVIEw中.希望对您有所帮助.

如果您需要更多帮助,则可能该链接会有所帮助：https://medium.com/@hitherejoe/exploring-the-android-design-support-library-bottom-navigation-drawer-548de699e8e0

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