Android之ViewPager与Fragment

功能是利用viewpager，通过按钮 btn1 和按钮 btn2 切换fragment1页面和fragment2页面。

下面是activity_main.xml布局文件：（底部两个按钮，上面一个ViewPager）

<?xml version="1.0" encoding="utf-8"?>

用ViewPager需要一个adapter来绑定数据，因为ViewPager常常和Fragment组合使用，所以有专门的FragmentPagerAdapter可供使用。

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {    private int PAGER_COUNT = 2;    private Fragment1 fragment1 = null;    private Fragment2 fragment2 = null;    public MyFragmentPagerAdapter(FragmentManager fm) {        super(fm);        fragment1 = new Fragment1();        fragment2 = new Fragment2();    }    @Override    public Fragment getItem(int i) {        Fragment fragment = null;        switch (i) {            case MainActivity.PAGE_ONE:                fragment = fragment1;                break;            case MainActivity.PAGE_TWO:                fragment = fragment2;                break;        }        return fragment;    }    @Override    public int getCount() {        return PAGER_COUNT;    }

MainActivity类，必须实现Fragment1.OnFragmentInteractionListener、Fragment2.OnFragmentInteractionListener、ViewPager.OnPageChangeListener这三个接口

public class MainActivity extends AppCompatActivity implements Fragment1.OnFragmentInteractionListener, Fragment2.OnFragmentInteractionListener,ViewPager.OnPageChangeListener {    private String TAG = "MainActivity";    //Fragment    public static final int PAGE_ONE = 0;    public static final int PAGE_TWO = 1;    private ViewPager vpager;    private MyFragmentPagerAdapter mAdapter;    Button btn1;    Button btn2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);               initView();        //ViewPager//fragment        mAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());        vpager = findViewById(R.id.view_pager);        vpager.setAdapter(mAdapter);        vpager.setCurrentItem(PAGE_ONE);        vpager.addOnPageChangeListener(this);          }    private void initView(){        btn1 = findViewById(R.id.btn_1_page);        btn2 = findViewById(R.id.btn_2_page);        //设置drawableTop        btn1.setCompoundDrawablesWithIntrinsicBounds(0, R.mipmap.folder_36dp, 0, 0);        btn1.setTextColor(getResources().getColor(R.color.mainColor));        btn1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                setPageOne();            }        });        btn2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                setPageTwo();            }        });    }    private void setPageOne(){        vpager.setCurrentItem(PAGE_ONE);        btn1.setCompoundDrawablesWithIntrinsicBounds(0, R.mipmap.img, 0, 0);        btn1.setTextColor(getResources().getColor(R.color.mainColor));        btn2.setCompoundDrawablesWithIntrinsicBounds(0, R.mipmap.img_grey, 0, 0);        btn2.setTextColor(getResources().getColor(R.color.gray));    }    private void setPageTwo(){        vpager.setCurrentItem(PAGE_TWO);        btn2.setCompoundDrawablesWithIntrinsicBounds(0, R.mipmap.img, 0, 0);        btn2.setTextColor(getResources().getColor(R.color.mainColor));        btn1.setCompoundDrawablesWithIntrinsicBounds(0, R.mipmap.img_grey, 0, 0);        btn1.setTextColor(getResources().getColor(R.color.gray));    }            @Override    public void onFragmentInteraction(Uri uri) {    }    @Override    public void onPageScrolled(int i, float v, int i1) {    }    @Override    public void onPageSelected(int i) {        Log.i(TAG,"PAGE"+i);        switch (i){            case 0:                setPageOne();                break;            case 1:                setPageTwo();                break;        }    }    @Override    public void onPageScrollStateChanged(int i) {    }}

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