【发布时间】：2017-04-28 02:33:48
【问题描述】：
我是 android 的初学者，今天我创建了一个 BottomNavigationView 活动，我想用导航按钮显示 3 个不同的选项卡，所以我创建了 3 个片段，问题是添加片段后，BottomNavigationView 显示在顶部side，我应该怎么做，如果我想要底部导航视图就像添加片段之前一样 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;
}
};
@Override
protected 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" />
【问题讨论】：