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   源码介绍

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TabLayout、ViewPager、NavigationView

package com.example.carson_ho.toptabbar;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private TabLayout mTabLayout;
    private ViewPager mViewPager;

    private MyFragmentPagerAdapter myFragmentPagerAdapter;

    private TabLayout.Tab one;
    private TabLayout.Tab two;
    private TabLayout.Tab three;
    private TabLayout.Tab four;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getSupportActionBar().hide();
        setContentView(R.layout.activity_main);

        //初始化视图
        initViews();
    }

    private void initViews() {

        mViewPager= (ViewPager) findViewById(R.id.viewPager);
        myFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(myFragmentPagerAdapter);

        mTabLayout = (TabLayout) findViewById(R.id.tabLayout);
        mTabLayout.setupWithViewPager(mViewPager);

        one = mTabLayout.getTabAt(0);
        two = mTabLayout.getTabAt(1);
        three = mTabLayout.getTabAt(2);
        four = mTabLayout.getTabAt(3);

        one.setIcon(R.mipmap.ic_launcher);
        two.setIcon(R.mipmap.ic_launcher);
        three.setIcon(R.mipmap.ic_launcher);
        four.setIcon(R.mipmap.ic_launcher);


    }
}