Question

有没有人知道我是否可以在Android Studio的ViewPage上放置一些按钮？

我正在尝试制作我的第一个应用程序，它需要用手指在屏幕之间移动，但这些屏幕有按钮。有人知道怎么做吗？

谢谢！

Answer 1

很容易！

布局ViewPager

<android.support.v4.view.ViewPager
    android:id="@+id/vpPager"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
</android.support.v4.view.ViewPager>

定义碎片

公共类FirstFragment扩展Fragment { //存储实例变量私有字符串标题; private int page;

// newInstance constructor for creating fragment with arguments
public static FirstFragment newInstance(int page, String title) {
    FirstFragment fragmentFirst = new FirstFragment();
    Bundle args = new Bundle();
    args.putInt("someInt", page);
    args.putString("someTitle", title);
    fragmentFirst.setArguments(args);
    return fragmentFirst;
}

// Store instance variables based on arguments passed
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    page = getArguments().getInt("someInt", 0);
    title = getArguments().getString("someTitle");
}

// Inflate the view for the fragment based on layout XML
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_first, container, false);
    TextView tvLabel = (TextView) view.findViewById(R.id.tvLabel);
    tvLabel.setText(page + " -- " + title);
    return view;
}

}

设置FragmentPagerAdapter

公共类MainActivity扩展FragmentActivity { // ...

public static class MyPagerAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 3;

    public MyPagerAdapter(FragmentManager fragmentManager) {
        super(fragmentManager);
    }

    // Returns total number of pages
    @Override
    public int getCount() {
        return NUM_ITEMS;
    }

    // Returns the fragment to display for that page
    @Override
    public Fragment getItem(int position) {
        switch (position) {
        case 0: // Fragment # 0 - This will show FirstFragment
            return FirstFragment.newInstance(0, "Page # 1");
        case 1: // Fragment # 0 - This will show FirstFragment different title
            return FirstFragment.newInstance(1, "Page # 2");
        case 2: // Fragment # 1 - This will show SecondFragment
            return SecondFragment.newInstance(2, "Page # 3");
        default:
            return null;
        }
    }

    // Returns the page title for the top indicator
    @Override
    public CharSequence getPageTitle(int position) {
        return "Page " + position;
    }

}

}

应用适配器

公共类MainActivity扩展FragmentActivity { FragmentPagerAdapter adapterViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    ViewPager vpPager = (ViewPager) findViewById(R.id.vpPager);
    adapterViewPager = new MyPagerAdapter(getSupportFragmentManager());
    vpPager.setAdapter(adapterViewPager);
}

// ...

}

设置OnPageChangeListener

//在活动中附加页面更改侦听器 vpPager.setOnPageChangeListener（new OnPageChangeListener（）{

// This method will be invoked when a new page becomes selected.
@Override
public void onPageSelected(int position) {
    Toast.makeText(HomeActivity.this, 
                "Selected page position: " + position, Toast.LENGTH_SHORT).show();
}

// This method will be invoked when the current page is scrolled
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    // Code goes here
}

// Called when the scroll state changes: 
// SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING
@Override
public void onPageScrollStateChanged(int state) {
    // Code goes here
}

}）;

如果您需要更多信息，请参阅此链接（它还解释了如何使用标签）：

https://github.com/codepath/android_guides/wiki/ViewPager-with-FragmentPagerAdapter

视图页面中的按钮

1 个答案: