Android 封装Fragment-BaseLazyFragment(懒加载)

Fragment 封装

1.封装布局(比较简单)

一般写Fragment继承android.support.v4.app.Fragment 重写Fragment的生命周期实现创建过程:添加布局

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = null;
        if (v == null) {
            v = inflater.inflate(R.layout.common_booklist_fragment, container, false);
            ButterKnife.bind(this, v);
            emptyLayout = new EmptyLayout(getActivity(), listview);
        }
        return v;
        }

BaseLazyFragment.java


  @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        int layoutId = getContentViewLayoutID();
        if (layoutId != 0) {
            return inflater.inflate(layoutId, container, false);
        } else {
            return super.onCreateView(inflater, container, savedInstanceState);
        }
    }

protected abstract int getContentViewLayoutID();//获取布局xml

使用的话很简单继承BaseLazyFragment重写getContentViewLayoutID()就行。

2.初始化控件 或者事件总线

@Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ButterKnife.bind(this, view);
        initViewsAndEvents(view);
    }

  protected abstract void initViewsAndEvents(View view);//初始化控件,如果使用butterknife就不需要写findViewById;

3.懒加载

第一次可见状态、可见状态、第一次不可见状态、不可见状态

    private boolean isFirstVisible = true;
    private boolean isFirstInvisible = true;
    private boolean isPrepared;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        initPrepare();
    }

    private synchronized void initPrepare() {
        if (isPrepared) {
            onFirstUserVisible();
        } else {
            isPrepared = true;
        }
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
            if (isFirstVisible) {
                isFirstVisible = false;
                initPrepare();
            } else {
                onUserVisible();
            }
        } else {
            if (isFirstInvisible) {
                isFirstInvisible = false;
                onFirstUserInvisible();
            } else {
                onUserInvisible();
            }
        }
    }

    protected abstract void onFirstUserVisible();
    protected abstract void onUserVisible();
    private void onFirstUserInvisible() { }
    protected abstract void onUserInvisible();

4.跳转

 /**
     * 封装跳转
     */
    protected void readyGo(Class clazz) {
        Intent intent = new Intent(getActivity(), clazz);
        startActivity(intent);
    }

    protected void readyGo(Class clazz, Bundle bundle) {
        Intent intent = new Intent(getActivity(), clazz);
        if (null != bundle) {
            intent.putExtras(bundle);
        }
        startActivity(intent);
    }

    protected void readyGoForResult(Class clazz, int requestCode) {
        Intent intent = new Intent(getActivity(), clazz);
        startActivityForResult(intent, requestCode);
    }

    protected void readyGoForResult(Class clazz, int requestCode, Bundle bundle) {
        Intent intent = new Intent(getActivity(), clazz);
        if (null != bundle) {
            intent.putExtras(bundle);
        }
        startActivityForResult(intent, requestCode);
    }

5.添加Toast,Dialog等等

源码:


/**
 * Created by ziyang on 16/12/28.
 * Version 1.0
 * 封装Fragment懒加载
 * 

* onCreateView() xml * onViewCreated() butterKnife initView() */ public abstract class BaseLazyFragment extends Fragment { private boolean isPrepared; private boolean isFirstVisible = true; private boolean isFirstInvisible = true; private Dialog mPro; protected MyToast myToast; protected Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { if (msg.what == DIALOG_SHOW) { mPro.show(); } else { mPro.dismiss(); } } }; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { int layoutId = getContentViewLayoutID(); if (layoutId != 0) { return inflater.inflate(layoutId, container, false); } else { return super.onCreateView(inflater, container, savedInstanceState); } } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); initPrepare(); mPro = createLoadingDialog1(getActivity()); myToast = new MyToast(getActivity()); } private synchronized void initPrepare() { if (isPrepared) { onFirstUserVisible(); } else { isPrepared = true; } } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); ButterKnife.bind(this, view); initViewsAndEvents(view); } @Override public void setUserVisibleHint(boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); if (isVisibleToUser) { if (isFirstVisible) { isFirstVisible = false; initPrepare(); } else { onUserVisible(); } } else { if (isFirstInvisible) { isFirstInvisible = false; onFirstUserInvisible(); } else { onUserInvisible(); } } } @Override public void onDestroy() { super.onDestroy(); destroyViewAndThing(); } protected abstract void onFirstUserVisible();//加载数据,开启动画/广播.. protected abstract void onUserVisible();///开启动画/广播.. private void onFirstUserInvisible() { } protected abstract void onUserInvisible();//暂停动画,暂停广播 protected abstract int getContentViewLayoutID(); protected abstract void initViewsAndEvents(View view); protected abstract void destroyViewAndThing();//销毁动作 public Dialog createLoadingDialog1(Context context) { LayoutInflater inflater = LayoutInflater.from(context); View v = inflater.inflate(R.layout.loading_dialog, null); // 得到加载view RelativeLayout layout = (RelativeLayout) v.findViewById(R.id.rl_probar); // 加载布局 Dialog loadingDialog = new Dialog(context, R.style.loading_dialog); // 创建自定义样式dialog layout.setVisibility(View.VISIBLE); loadingDialog.setCancelable(true);// 不可以用"返回键"取消 loadingDialog.setCanceledOnTouchOutside(true); loadingDialog.setContentView(layout, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); return loadingDialog; } /** * 封装跳转 */ protected void readyGo(Class clazz) { Intent intent = new Intent(getActivity(), clazz); startActivity(intent); } protected void readyGo(Class clazz, Bundle bundle) { Intent intent = new Intent(getActivity(), clazz); if (null != bundle) { intent.putExtras(bundle); } startActivity(intent); } protected void readyGoForResult(Class clazz, int requestCode) { Intent intent = new Intent(getActivity(), clazz); startActivityForResult(intent, requestCode); } protected void readyGoForResult(Class clazz, int requestCode, Bundle bundle) { Intent intent = new Intent(getActivity(), clazz); if (null != bundle) { intent.putExtras(bundle); } startActivityForResult(intent, requestCode); } }

当然还有MVP的封装:

public abstract class BaseFragment extends SupportFragment {

    private final String TAG = getClass().getSimpleName();
    protected T mPresenter;
    protected Context mContext;
    protected View rootView;
    protected Unbinder unbinder;
    private boolean isViewPrepared; // 标识fragment视图已经初始化完毕
    private boolean hasFetchData; // 标识已经触发过懒加载数据

    @Override
    public void onAttach(Context mContext) {
        super.onAttach(mContext);
        KL.d(this.getClass(), getName() + "------>onAttach");
        if (mContext != null) {
            this.mContext = mContext;
        } else {
            this.mContext = getActivity();
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        KL.d(this.getClass(), getName() + "------>onCreate");
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        KL.d(this.getClass(), getName() + "------>onCreateView");
        if (rootView == null) {
            rootView = inflater.inflate(getLayout(), container, false);
        }
        ViewGroup parent = (ViewGroup) rootView.getParent();
        if (parent != null) {
            parent.removeView(rootView);
        }
        unbinder = ButterKnife.bind(this, rootView);
        initView(inflater);
        EventBus.getDefault().register(this);
        setTitleHeight(rootView);
        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        KL.d(this.getClass(), getName() + "------>onActivityCreated");
        initEvent();
    }

    @Override
    public void onStart() {
        super.onStart();
        KL.d(this.getClass(), getName() + "------>onStart");
    }

    @Override
    public void onResume() {
        super.onResume();
        KL.d(this.getClass(), getName() + "------>onResume");
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        KL.d(this.getClass(), getName() + "------>onViewCreated");
        isViewPrepared = true;
        lazyFetchDataIfPrepared();
    }

    @Override
    public void onPause() {
        super.onPause();
        KL.d(this.getClass(), getName() + "------>onPause");
    }

    @Override
    public void onStop() {
        super.onStop();
        KL.d(this.getClass(), getName() + "------>onStop");
    }

    @Override
    public void onDestroyView() {
        EventBus.getDefault().unregister(this);
        super.onDestroyView();
        KL.d(this.getClass(), getName() + "------>onDestroyView");
        // view被销毁后,将可以重新触发数据懒加载,因为在viewpager下,fragment不会再次新建并走onCreate的生命周期流程,将从onCreateView开始
        hasFetchData = false;
        isViewPrepared = false;
        mPresenter = null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        KL.d(this.getClass(), getName() + "------>onDestroy");
        if (unbinder != null)
            unbinder.unbind();
    }

    @Override
    public void onDetach() {
        super.onDetach();
        KL.d(this.getClass(), getName() + "------>onDetach");
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        Log.v(TAG, getClass().getName() + "------>isVisibleToUser = " + isVisibleToUser);
        if (isVisibleToUser) {
            lazyFetchDataIfPrepared();
        }
    }

    private void lazyFetchDataIfPrepared() {
        // 用户可见fragment && 没有加载过数据 && 视图已经准备完毕
        if (getUserVisibleHint() && !hasFetchData && isViewPrepared) {
            hasFetchData = true;
            lazyFetchData();
        }

    }

    /**
     * 懒加载的方式获取数据,仅在满足fragment可见和视图已经准备好的时候调用一次
     */
    protected void lazyFetchData() {
        Log.v(TAG, getClass().getName() + "------>lazyFetchData");
    }

    public String getName() {
        return BaseFragment.class.getName();
    }

    protected abstract int getLayout();

    protected void initView(LayoutInflater inflater) {
    }

    protected void initEvent() {
    }
}

参考链接:Android谈谈封装那些事–BaseActivity和BaseFragment(二)

封装篇——Fragment懒加载

你可能感兴趣的:(Android优化,Android)