Android 之 BaseFragment（懒加载）

1.获取全局上下文

2.加载view的方法

3.初始化view

4.懒加载

5.跳转

6.刷新loading

package com.huading.myvolley.base;

import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.huading.myvolley.widget.LoadingDialog;


/**
 * 作者：LHZ on 2017/5/25 10:44
 * 界面：
 */
public abstract class BaseFragment extends Fragment {

    private static final String TAG = BaseFragment.class.getSimpleName();
    // 加载进度条
    public LoadingDialog mLoadingDialog = null;
    // 第一次用户可见
    private boolean isFirstVisible = true;
    // 第一次用户不可见
    private boolean isFirstInvisible = true;
    // 是否已经加载view
    private boolean isPrepared;
    // 全局
    public Activity mActivity;

    /**
     * 获得全局的
     *
     * @param context
     */
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        this.mActivity = (Activity) context;
    }

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

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

    // 加载view
    protected abstract int getContentViewLayoutID();

    // 初始化view
    protected abstract void initViewsAndEvents(View view);

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

    // 是否已经加载view
    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();
            }
        }
    }

    // 第一次用户可见 加载数据
    protected abstract void onFirstUserVisible();

    // 用户可见 开启动画
    protected abstract void onUserVisible();

    // 第一次用户不可见
    private void onFirstUserInvisible() {
    }

    // 用户不可见 暂停动画
    protected abstract void onUserInvisible();

    @Override
    public void onDestroy() {
        DestroyViewAndThing();
        super.onDestroy();
    }

    // 销毁
    protected abstract void DestroyViewAndThing();


    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);
    }


    /**
     * 显示刷新Loadding
     */
    public void showLoadingDialog(String message) {
        try {
            mLoadingDialog = LoadingDialog.createDialog(mActivity);
            mLoadingDialog.setTitle(null);
            mLoadingDialog.setCancelable(false);

            mLoadingDialog.setMessage(message);
            mLoadingDialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
                @Override
                public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                    if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
                        hideLoadingDialog();
                    }
                    return true;
                }
            });
            mLoadingDialog.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 隐藏刷新Loadding
     */
    public void hideLoadingDialog() {
        try {
            if (mLoadingDialog != null) {
                if (mLoadingDialog.animation != null) {
                    mLoadingDialog.animation.reset();
                }
                mLoadingDialog.dismiss();
                mLoadingDialog = null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}