安卓中Viewpager+BottomNavigationBar+fragment+toolbar

关于状态栏透明代码在另一篇文章状态栏

几个fragment的代码

public class WechatFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.wechatfragment,container,false);
        return view;
    }
}

menu的创建:resNew一个directory,创建一个menu,然后New一个Menu resource file,创建一个toolbar.xml文件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/add_friend"
        android:icon="@drawable/friend_nor"
        android:title="添加朋友"
        app:showAsAction="never" />
    <item
        android:id="@+id/scan"
        android:icon="@drawable/friend_nor"
        android:title="扫一扫"
        app:showAsAction="never" />
    <item
        android:id="@+id/feedback"
        android:icon="@drawable/friend_nor"
        android:title="帮助和反馈"
        app:showAsAction="never" />
    <item
        android:id="@+id/search"
        android:icon="@drawable/search"
        app:showAsAction="always"
        android:title="" />

</menu>

mainactivity.xml代码

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorLightGray"
        android:fitsSystemWindows="true"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Dark" />

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/main_vp"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:fitsSystemWindows="true">
    </androidx.viewpager.widget.ViewPager>


    <com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_navigation_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:fitsSystemWindows="true" />

</LinearLayout>

Fragment的适配器

public class FragmentAdapter extends FragmentPagerAdapter {
    List<Fragment> list = new ArrayList<>();
    public FragmentAdapter(FragmentManager fm,List<Fragment> list) {
        super(fm);
        this.list = list;
    }

    @Override
    public Fragment getItem(int position) {
        return list.get(position);
    }

    @Override
    public int getCount() {
        return list.size();
    }
}

MainActivity

package com.example.wechat;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager.widget.ViewPager;

import android.annotation.SuppressLint;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import com.ashokvarma.bottomnavigation.BottomNavigationBar;
import com.ashokvarma.bottomnavigation.BottomNavigationItem;
import com.ashokvarma.bottomnavigation.ShapeBadgeItem;
import com.ashokvarma.bottomnavigation.TextBadgeItem;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private BottomNavigationBar bottomNavigationBar;
    WechatFragment wechatFragment = new WechatFragment();
    FriendFragment friendFragment = new FriendFragment();
    MineFragment mineFragment = new MineFragment();
    Toolbar toolbar;
    ViewPager viewPager;
    List<Fragment> fragments = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initStatusBar();//初始化状态栏
        initView();
        initViewPager();
        setView();
    }

    private void initViewPager() {
        FragmentAdapter adapter = new FragmentAdapter(getSupportFragmentManager(),fragments);
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                bottomNavigationBar.selectTab(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

    private void initStatusBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
            StatusBarUtils.setStatusBarColor(MainActivity.this, R.color.colorLightGray);
        }
    }

    private void initView() {
        bottomNavigationBar = findViewById(R.id.bottom_navigation_bar);
        toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        toolbar.setTitle("微聊");
        viewPager = findViewById(R.id.main_vp);
        fragments.add(wechatFragment);
        fragments.add(friendFragment);
        fragments.add(mineFragment);
    }

    @SuppressLint("ResourceAsColor")
    private void setView() {
        bottomNavigationBar.setMode(BottomNavigationBar.MODE_FIXED)
                .setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_STATIC);
        //设置bar的颜色
        bottomNavigationBar.setBarBackgroundColor(R.color.colorLightGray);
        bottomNavigationBar
                .addItem(new BottomNavigationItem(R.drawable.talk_pres, "微聊")
                        .setInactiveIcon(ContextCompat.getDrawable(MainActivity.this, R.drawable.talk_nor))
                        .setActiveColorResource(R.color.colorGreen)

                        .setInActiveColorResource(R.color.colorGray))

                .addItem(new BottomNavigationItem(R.drawable.friend_pres, "好友")
                        .setActiveColorResource(R.color.colorGreen)
                        .setInActiveColorResource(R.color.colorGray)
                        .setInactiveIcon(ContextCompat.getDrawable(MainActivity.this, R.drawable.friend_nor)))
                .addItem(new BottomNavigationItem(R.drawable.mine_press, "我的")
                        .setActiveColorResource(R.color.colorGreen)
                        .setInActiveColorResource(R.color.colorGray)
                        .setInactiveIcon(ContextCompat.getDrawable(MainActivity.this, R.drawable.mine_nor)))
                .setFirstSelectedPosition(0)
                .initialise();

        viewPager.setCurrentItem(0);

        bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener() {
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void onTabSelected(int position) {
                switch (position) {
                    case 0:
                        toolbar.setTitle("微聊");
                        if (wechatFragment == null) {
                            wechatFragment = new WechatFragment();
                            viewPager.setCurrentItem(position);
                        } else {
                            viewPager.setCurrentItem(position);
                        }
                        break;
                    case 1:
                        toolbar.setTitle("好友");
                        if (friendFragment == null) {
                            friendFragment = new FriendFragment();
                            viewPager.setCurrentItem(position);
                        } else {
                            viewPager.setCurrentItem(position);
                        }
                        break;
                    case 2:
                        toolbar.setTitle("我的");
                        if (mineFragment == null) {
                            mineFragment = new MineFragment();
                            viewPager.setCurrentItem(position);
                        } else {
                            viewPager.setCurrentItem(position);
                        }
                        break;
                    default:
                        break;
                }
            }

            @Override
            public void onTabUnselected(int position) {

            }

            @Override
            public void onTabReselected(int position) {

            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.toolbar, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.add_friend:
                Toast.makeText(this, "你点击了add", Toast.LENGTH_SHORT).show();
                break;
            case R.id.scan:
                Toast.makeText(this, "你点击了扫一扫", Toast.LENGTH_SHORT).show();
                break;
            case R.id.feedback:
                Toast.makeText(this, "你点击了feedback", Toast.LENGTH_SHORT).show();
                break;
            case R.id.search:
                Toast.makeText(this, "你点击了search", Toast.LENGTH_SHORT).show();
                break;
            default:
                break;

        }
        return true;
    }

}