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1BottomNavigationView

实现参考链接https://juejin.im/entry/583414ce61ff4b006b8cf338http://blog.csdn.net/qq_35366908/article/details/72457909

实现方式：1.1 BottomNavigationView是放置在design包中的，所以，使用前需要先引入com.android.support:design:25.1.0包1.2xml

布局

xmlns:app="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:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/tb_toolbar"

android:orientation="vertical">

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="22dp"

tools:text="123524352"/>

android:id="@+id/bnv_menu"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

app:itemIconTint="@color/selector_blue"

app:itemTextColor="@color/selector_blue"

app:menu="@menu/menu_bottom_navigation"/>

android:layout_width="match_parent"

android:layout_height="1dp"

android:layout_above="@id/bnv_menu"

android:background="@color/gray"/>

java代码

publicclassMainActivityextendsAppCompatActivityimplementsBottomNavigationView.OnNavigationItemSelectedListener{privateTextFragment fragment;@OverrideprotectedvoidonCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

FragmentManager fragmentManager = getSupportFragmentManager();

fragment =newTextFragment();

FragmentTransaction transaction = fragmentManager.beginTransaction();

transaction.replace(R.id.fragment_container, fragment);

transaction.commit();

BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.navigation_view);

bottomNavigationView.setOnNavigationItemSelectedListener(this);

}@OverridepublicbooleanonNavigationItemSelected(@NonNull MenuItem item){@StringResinttext;switch(item.getItemId()) {caseR.id.recents:

text = R.string.recents;break;caseR.id.favourites:

text = R.string.favourites;break;caseR.id.nearby:

text = R.string.nearby;break;default:returnfalse;

}

switchFragmentText(text);returntrue;

}privatevoidswitchFragmentText(@StringResinttext){

fragment.setText(text);

}

}

}

详细

package com.song.wallpager;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentTransaction;

import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.design.widget.BottomNavigationView;

import android.view.MenuItem;

import android.widget.TextView;

public class MainActivity extends FragmentActivity {

private Fragment1 fragment1;

private Fragment2 fragment2;

private Fragment3 fragment3;

private Fragment[] fragments;

private int lastShowFragment = 0;

private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener

= new BottomNavigationView.OnNavigationItemSelectedListener() {

@Override

public boolean onNavigationItemSelected(@NonNull MenuItem item) {

switch (item.getItemId()) {

case R.id.navigation_home:

if (lastShowFragment != 0) {

switchFrament(lastShowFragment, 0);

lastShowFragment = 0;

}

return true;

case R.id.navigation_dashboard:

if (lastShowFragment != 1) {

switchFrament(lastShowFragment, 1);

lastShowFragment = 1;

}

return true;

case R.id.navigation_notifications:

if (lastShowFragment != 2) {

switchFrament(lastShowFragment, 2);

lastShowFragment = 2;

}

return true;

}

return false;

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);

navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

initFragments();

}

/**

* 切换Fragment

*

* @param lastIndex 上个显示Fragment的索引

* @param index     需要显示的Fragment的索引

*/

public void switchFrament(int lastIndex, int index) {

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

transaction.hide(fragments[lastIndex]);

if (!fragments[index].isAdded()) {

transaction.add(R.id.fragment_container, fragments[index]);

}

transaction.show(fragments[index]).commitAllowingStateLoss();

}

private void initFragments() {

fragment1 = new Fragment1();

fragment2 = new Fragment2();

fragment3 = new Fragment3();

fragments = new Fragment[]{fragment1, fragment2, fragment3};

lastShowFragment = 0;

getSupportFragmentManager()

.beginTransaction()

.add(R.id.fragment_container, fragment1)

.show(fragment1)

.commit();

}

}