4-AVI--Fragment与ViewPager结合

/**
 * 作者：张风捷特烈<br/>
 * 时间：2018/8/29 0029:11:25<br/>
 * 邮箱：1981462002@qq.com<br/>
 * 说明：ViewPager和Fragment集合测试的Fragment
 */
public class ViewPagerFragment extends Fragment {
    private static final String TAG = "ViewPagerFragment";
    private String mName;

    /**
     *
     * @param bundle Activity向Fragment的数据
     * @return ViewPagerFragment对象
     */
    public static ViewPagerFragment newInstance(Bundle bundle) {
        //新建ViewPagerFragment对象
        ViewPagerFragment instance = new ViewPagerFragment();
        //设置参数并返回出ViewPagerFragment对象
        instance.setArguments(bundle);
        return instance;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_viewpager, null);
        view.setBackgroundColor(ColUtils.randomRGB());
        TextView tv = view.findViewById(R.id.tv_vp_fg_name);

        mName = getArguments().getString(Cons.EXTRA_CONTENT);
        tv.setText(mName);

        Log.e(TAG, "onCreateView: " + mName);

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.e(TAG, "onResume: " + mName);
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.e(TAG, "onPause: " + mName);
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.e(TAG, "onStop: " + mName);
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        Log.e(TAG, "onDestroyView: " + mName);
    }
    

    @Override
    public void onDetach() {
        super.onDetach();
        Log.e(TAG, "onDetach: " + mName);
    }

    @Override
    public void onDestroy() {
        Log.e(TAG, "onDestroy: " + mName);
        super.onDestroy();
    }
    
}

public class ViewPagerFragmentActivity extends FragmentActivity {

    @BindView(R.id.id_vp)
    ViewPager mIdVp;
    private ArrayList<Fragment> mFragments;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_viewpager);
        ButterKnife.bind(this);

        ArrayList<String> names = DataUtils.getRandomName(5, true);

        mFragments = new ArrayList<>();

        for (String name : names) {
            //新建Bundle对象
            Bundle arguments = new Bundle();
            //以键值对的方式放入Bundle对象中
            arguments.putString(Cons.EXTRA_CONTENT, name);
            //创建ViewPagerFragment并加入mFragments集合中
            mFragments.add(ViewPagerFragment.newInstance(arguments));
        }

        //设置适配器:这里用匿名内部类，你也可以单独抽出(就两个方法，也没太大必要)
        mIdVp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return mFragments.get(position);
            }

            @Override
            public int getCount() {
                return mFragments.size();
            }
        });
    }
}

/**
 * 作者：张风捷特烈<br/>
 * 时间：2018/8/29 0029:12:54<br/>
 * 邮箱：1981462002@qq.com<br/>
 * 说明：懒加载Fragment
 */
public abstract class LazyFragment extends Fragment {
    /**
     * 视图是否初始化
     */
    protected boolean initOK = false;
    protected boolean isLoad = false;
    private View mRootView;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        //加载布局
        mRootView = inflater.inflate(setLayoutId(), container, false);

        initOK = true;
        isCanLoadData();//初始化的时候去加载数据
        return mRootView;
    }

    /**
     * 视图是否已经对用户可见，系统的方法
     */
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        isCanLoadData();
    }

    /**
     * 是否可以加载数据
     * 可以加载数据的条件：
     * 1.视图已经初始化
     * 2.视图对用户可见
     */
    private void isCanLoadData() {
        if (!initOK) {//未加载
            return;
        }
        if (getUserVisibleHint()) {
            lazyLoad(mRootView);
            isLoad = true;
        } else {
            if (isLoad) {
                stopLoad();
            }
        }
    }

    /**
     * 视图销毁的时候讲Fragment是否初始化的状态变为false
     */
    @Override
    public void onDestroyView() {
        super.onDestroyView();
        initOK = false;
        isLoad = false;

    }

    /**
     * 设置Fragment要显示的布局
     *
     * @return 布局的layoutId
     */
    protected abstract int setLayoutId();
    
    
    /**
     * 找出对应的控件
     *
     * @param id 控件id
     * @param <T> 控件类型
     * @return 控件
     */
    protected <T extends View> T findViewById(int id) {

        return (T) mRootView.findViewById(id);
    }

    /**
     * 当视图初始化并且对用户可见的时候去真正的加载数据
     */
    protected abstract void lazyLoad(View view);

    /**
     * 当视图已经对用户不可见并且加载过数据，如果需要在切换到其他页面时停止加载数据，可以覆写此方法
     */
    protected void stopLoad() {
    }
}

    @Override
    protected void lazyLoad(View view) {
        view.setBackgroundColor(ColUtils.randomRGB());
        TextView tv = findViewById(R.id.tv_vp_fg_name);
        mName = getArguments().getString(Cons.EXTRA_CONTENT);
        tv.setText(mName);
        Log.e(TAG, "onCreateView: " + mName);
    }

    @Override
    protected int setLayoutId() {
        return R.layout.fragment_viewpager;
    }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".activity.ActFragmentActivity">

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <TextView
        android:id="@+id/tv_vp_fg_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textColor="#fff"
        android:textSize="50sp"/>
</RelativeLayout>