如何实现Fragment的滑动？

Answer 1

将Fragment与viewpager绑定，通过viewpager中的touch事件，会进行move事件的滑动处理。

Fragment布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_red_light">
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="Fragment One" />
    </LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_red_light">
    <TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="Fragment Two" />
    </LinearLayout>
Fragment代码：

public class FragmentOne extends Fragment {
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
           return inflater.inflate(R.layout.fragment_one, container, false);
}

}
public class FragmentTwo extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
   return inflater.inflate(R.layout.fragment_Two, container, false);
}
}

 

viewpager布局：

 

xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.spreadtrumshitaoli.fragmentscroll.MainActivity">
<android.support.v4.view.ViewPager
    android:id="@+id/view_pager"
    android:layout_height="match_parent"
    android:layout_width="match_parent"/>
</android.support.constraint.ConstraintLayout>

MainActivity代码：

 

public class MainActivity extends AppCompatActivity {
private FragmentOne fragmentOne;
private FragmentTwo fragmentTwo;
 
private ViewPager viewPager;
 
private ArrayList<Fragment> mFragmentList = new ArrayList <Fragment>();
private FragmentPagerAdapter fragmentPagerAdapter;
 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
    init();
 
}
 
private void init() {
 
    viewPager = (ViewPager) findViewById(R.id.view_pager);
    fragmentOne = new FragmentOne();
    fragmentTwo = new FragmentTwo();
 
    mFragmentList.add(fragmentOne);
    mFragmentList.add(fragmentTwo);
    
    //将adapter和fragment绑定在一起。
        fragmentPagerAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return mFragmentList != null ? mFragmentList.get(i) : null;
            }
            @Override
        public int getCount() {
            return mFragmentList != null ? mFragmentList.size() : 0;
        }
    };
    viewPager.setAdapter(fragmentPagerAdapter);
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int i, float v, int i1) {
 
        }
 
        @Override
        public void onPageSelected(int i) {
            //TODO:
        }
 
        @Override
        public void onPageScrollStateChanged(int i) {
 
        }
    });
 
}
   } 

在这段代码中，我们

首先fragment以及viewpager都实例化；

再将fragment添加到泛型arraylist里；

最后将带有fragment的arraylist和adapter绑定。