ViewPager结合Fragment 实现的页面切换

最新推荐文章于 2019-10-10 23:34:09 发布

原创最新推荐文章于 2019-10-10 23:34:09 发布 · 519 阅读

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本文介绍了如何在Android应用中实现二次登录时直接显示主界面并自动跳转，以及使用ViewPager进行页面滑动和切换的方法。通过SharedPreferences保存登录状态，并利用Timer实现延迟跳转；通过自定义FragmentPagerAdapter和ViewPager实现页面之间的联动。

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是否第二次登陆

  //记录是否第二次登陆 第二次登陆直接显示界面，然后两秒后跳转
        SharedPreferences sp = getSharedPreferences("config", MODE_PRIVATE);
        SharedPreferences.Editor edit = sp.edit();
        //判断是否为空
        boolean city = sp.getBoolean("city", false);
        if (city){
            img.setVisibility(View.VISIBLE);
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    coo--;
                    handler.sendEmptyMessage(0);
                }
            }, 0, 2000);
        }
        //存值进去
        edit.putBoolean("city",true);
        edit.commit();

页面滑动及切换

public class MainActivity extends FragmentActivity implements OnCheckedChangeListener{

    private ViewPager vpager;
    private RadioGroup group;
    private RadioButton but1;
    private RadioButton but2;
    private RadioButton but3;
    private List<Fragment> asList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        vpager = (ViewPager) findViewById(R.id.Vpager);
        group = (RadioGroup) findViewById(R.id.group);
        but1 = (RadioButton) findViewById(R.id.radio_but1);
        but2 = (RadioButton) findViewById(R.id.radio_but2);
        but3 = (RadioButton) findViewById(R.id.radio_but3);
        group.setOnCheckedChangeListener(this);
        asList = Arrays.asList(new Fragment1(), new Fragment2(), new Fragment3());
        initLintener();
    }

    private void initLintener() {
        vpager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {            
            @Override
            public int getCount() {
                return asList != null ? asList.size() : 0;
            }            
            @Override
            public Fragment getItem(int arg0) {
                return asList.get(arg0);
            }
        });

        vpager.setOnPageChangeListener(new OnPageChangeListener() {            
            @Override
            public void onPageSelected(int arg0) {
                switch (arg0) {
                case 0:
                    but1.setChecked(true);
                    break;
                case 1:
                    but2.setChecked(true);
                    break;
                case 2:
                    but3.setChecked(true);
                    break;
                }                
            }            
            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {

            }            
            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });

    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        int count = 0;
        switch (checkedId) {
        case R.id.radio_but1:
            count = 0;
            break;
        case R.id.radio_but2:
            count = 1;
            break;
        case R.id.radio_but3:
            count = 2;
            break;
        }
        if (vpager.getCurrentItem() != count) {
            vpager.setCurrentItem(count, false);
        }
    }

}